1 saw 1.1 \documentclass{chowto}
2
3 \title{How to Set the HMS Magnets}
4 \howtotype{user} % ``expert'', ``user'', ``reference''
5 %\experiment{Name of experiment} % Optional
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6 saw 1.5 \author{Mike Fowler and Dave Gaskell}
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7 saw 1.1 \category{magnet} % Subject area of this document
8 %\maintainer{Name of person maintaining document} % Optional
9 \date{\today} % Can use \today as the argument
10
11 \begin{document}
12
13 \begin{abstract}
14 This document describes how one determines and sets the needed
15 currents/fields for the HMS magnets (quadrupoles and dipole).
16 \end{abstract}
17
18 \section{Calculate Magnet Settings}\label{field}
19
20 The HMS magnet settings are calculated using the program ``field03''. This
21 program will provide the needed set--currents for Q1, Q2, and Q3, and the
22 needed field for the dipole. To
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23 saw 1.5 access this program, log into cdaqs1 or cdaqs3 as cdaq. Go to the
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24 saw 1.1 \texttt{FIELD} directory (\texttt{cd FIELD}) and run \texttt{field03}. An
25 example follows:\\
26 \vspace*{0.2in}\\
27 \texttt{cdaqs1> field03}\\
28 \texttt{Input HMS momentum in GeV, electron is negative.}\\
29 \texttt{-2.0}\\
30 \texttt{Field03 program}\\
31 \texttt{Set current for Q1 = 260.49874122486 amps}\\
32 \texttt{Set current for Q2 = -207.05390149569 amps}\\
33 \texttt{Set current for Q3 = 100.945638467771 amps}\\
34 \texttt{Set NMR for Dipole = -0.54971654308813 Tesla}\\
35
36
37 \section{Setting the Magnets - Quick--Start Guide}
38
39 \subsection{Select a magnet}
40
41 The quadrupoles (and the dipole) are set from the keyboard and screen in
42 in the central controls console, under the large TV screens. Note that
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43 saw 1.3 the actual controls PC's (a separate one for each magnet) are in the Hall and
44 we are using a remote screen and keyboard. The same screen is used to display
45 the controls for all 4 HMS magnets.
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46 saw 1.1
47 One must switch the screen from magnet--to--magnet using a
48 sequence of keyboard commands. This sequence is referred to as the
49 ``NumLock--minus--NumLock'' or the NmN sequence. To select a magnet:
50
51 \begin{itemize}
52 \item{Press and hold the \texttt{NumLock} key.}
53 \item{Press and hold the \texttt{-} key.}
54 \item{Release the \texttt{-} key.}
55 \item{Release the \texttt{NumLock} key.}
56 \item{Press one of the following:}\\
57 %\begin{itemize}
58 % \item{\texttt{a} for Q1}
59 % \item{\texttt{b} for Q2}
60 % \item{\texttt{c} for Q3}
61 % \item{\texttt{d} for the dipole}
62 %\end{itemize}
63 \texttt{a} for Q1\\
64 \texttt{b} for Q2\\
65 \texttt{c} for Q3\\
66 \texttt{d} for the dipole\\
67 saw 1.1 \item{Hit \texttt{return}.}
68 \end{itemize}
69
70
71
72 \subsection{Set the quadrupoles}\label{quad_set}
73
74 This section assumes that all the quadrupoles are already on, at the
75 correct polarity, and functioning normally. If they are not at the correct
76 polarity, see Section~\ref{quadpol}.
77
78 If you are changing the current to a {\bf{smaller}} value:
79
80 \begin{itemize}
81 \item{Select the magnet (see above).}
82 \item{Select the \texttt{Command Line} window with the arrow keys on the
83 keyboard.}
84 \item{Type \texttt{psu:setcur:xxx.xx}, where \texttt{xxx.xx} is the absolute
85 value of the current from the magnet setting program.}
86 \item{Hit enter - the magnet should start ramping to the desired current.}
87 \end{itemize}
88 saw 1.1
89 If you are changing the current to a {\bf{larger}} value:
90
91 \begin{itemize}
92 \item{Select the magnet (see above).}
93 \item{Select the \texttt{Command Line} window with the arrow keys on the
94 keyboard.}
95 \item{Set the current to 200 Amps {\bf{above}} the current calculated
96 in the magnet setting program. Type \texttt{psu:setcur:yyy.yyy}, where
97 \texttt{yyy.yy} is the absolute value of the current determined in the magnet
98 setting program + 200. Hit enter and wait for the magnet to reach the current
99 you just typed in.}
100 \item{Type \texttt{psu:setcur:xxx.xx}, where \texttt{xxx.xx} is the absolute
101 value of the current from the magnet setting program.}
102 \item{Hit enter - the magnet should start ramping to the desired current.}
103 \end{itemize}
104
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105 saw 1.3 Note that on occasion one must enter the relevant command (psu:setcur:xxx.xx
106 for example) more than once before the control computer will respond. It is in
107 general a good idea to watch for about 30 seconds to see if the computer
108 responds to your command. If it does not, just re--enter the command.
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109 saw 1.1
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110 saw 1.2 \subsection{Set the dipole}\label{setdipole}
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111 saw 1.1
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112 saw 1.5 The dipole can be set in three modes: Current Control, Manual NMR Field
113 Control, and Automatic NMR Controlled Ramp. The default method is at the
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114 saw 1.2 discretion of the experiment -- consult your run coordinator. In this
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115 saw 1.5 section, setting the dipole using automatic NMR controlled ramp will be discussed. To switch
116 to another operation mode, the dipole current must be zero.
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117 saw 1.1
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118 saw 1.5
119 \subsubsection{Automatic NMR Controlled Ramp (Field Regulation Mode) - Starting from Zero}
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120 saw 1.1
121 \begin{itemize}
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122 saw 1.5 \item{Select the dipole screen on the magnet controls console.}
123 \item{Press F1 to go to the dipole main menu screen.}
124 \item{Check the interlock status in the upper right corner of the main menu. If the interlock
125 status field is flashing red:}
126
127 \begin{itemize}
128 \item{Using the arrow keys, position the cursor over the \texttt{INTERLOCK} menu item.
129 Type \texttt{exe} and press ENTER.}
130 \item{Position the cursor over the \texttt{RESET INTERLOCK} menu item. Type
131 \texttt{exe} and press ENTER.}
132 \item{Press F1 and return to main menu.}
133 \end{itemize}
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134 saw 1.1
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135 saw 1.5 \item{Position the cursor over the \texttt{FIELD REGULATION} menu item - then type
136 {\texttt{exe}} and press ENTER.}
137
138 \item{Position the cursor over the \texttt{DEFAULT mode} menu item. Type \texttt{exe}
139 and press ENTER.}
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140 saw 1.1
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141 saw 1.5 \item{Position the cursor over the \texttt{NMR start, PWR on} menu item, type \texttt{exe} and
142 press ENTER. After approximately one minute the NMR unit is activated. The NMR is on when the status
143 field is white starts on a green background.}
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144 saw 1.1
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145 saw 1.5 \item{Position the cursor over the \texttt{Set DEFAULT values} menu item, type \texttt{exe} and press
146 ENTER.}
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147 saw 1.1
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148 saw 1.5 \item{Position the cursor over the \texttt{high} value menu item, type \texttt{exe} and press ENTER.}
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149 saw 1.1
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150 saw 1.5 \item{Type in the first 4 digits of the desired magnetic field and hit ENTER. For the example field from
151 field03 shown in Section~\ref{field} (0.5497165 T), the first 4 digits are 0549 for 0.549.}
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152 saw 1.1
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153 saw 1.5 \item{Position the cursor over the \texttt{low} value menu item, type \texttt{exe} and press ENTER.}
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154 saw 1.1
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155 saw 1.5 \item{Type in the last 4 digits of the desired magnetic field and hit ENTER. Example: for 0.5497165 T, type
156 7165.}
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157 saw 1.1
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158 saw 1.5 \item{Position the cursor over the \texttt{CLOSE} menu item, type \texttt{exe} and press ENTER.}
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159 saw 1.1
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160 saw 1.5 \item{Position the cursor over the \texttt{Start Excitation} menu item, type \texttt{exe} and press ENTER.}
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161 saw 1.1
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162 saw 1.5 \item{The dipole will now follow the excitation curve and ramp to the desired field.}
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163 saw 1.1
164 \end{itemize}
165
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166 saw 1.2
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167 saw 1.5 \subsubsection{Changing the HMS Dipole Field in Regulation Mode}
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168 saw 1.2
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169 saw 1.5 \begin{itemize}
170
171 \item{Position the cursor over the \texttt{Set DEFAULT values} menu item, type \texttt{exe} and
172 press ENTER.}
173
174 \item{Position the cursor over the \texttt{high} menu item, type \texttt{exe} and
175 press ENTER.}
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176 saw 1.2
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177 saw 1.5 \item{Type in the first 4 digits of the desired magnetic field and hit ENTER. For the example field from
178 field03 shown in Section~\ref{field} (0.5497165 T), the first 4 digits are 0549 for 0.549.}
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179 saw 1.1
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180 saw 1.5 \item{Position the cursor over the \texttt{low} value menu item, type \texttt{exe} and press ENTER.}
181
182 \item{Type in the last 4 digits of the desired magnetic field and hit ENTER. Example: for 0.5497165 T, type
183 7165.}
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184 saw 1.1
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185 saw 1.5 \item{Position the cursor over the \texttt{CLOSE} menu item, type \texttt{exe} and press ENTER.}
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186 saw 1.1
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187 saw 1.5 \item{Position the cursor over the \texttt{Start Excitation} menu item, type \texttt{exe} and press ENTER.}
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188 saw 1.1
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189 saw 1.5 \item{The dipole will now follow the excitation curve and ramp to the desired field.}
190 \end{itemize}
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191 saw 1.1
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192 saw 1.5 \subsubsection{HMS Dipole Ramp up-err/ Field crtl-err}
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193 saw 1.1
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194 saw 1.5 Occasionally the NMR unit terminates the field ramp up/down or terminates the field control.
195 When this happens, the \texttt{Ramp up-err} or \texttt{Field crtl-err} will change to red.
196 You should always record any fault indications in the hclog, then perform the following:
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197 saw 1.1
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198 saw 1.5 \begin{itemize}
199 \item{Position the cursor over the \texttt{RESET} menu item next to the error indicator, type
200 \texttt{exe} and press ENTER. The NMR unit will continue the ramp up/down or restart
201 field control.}
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202 saw 1.1 \end{itemize}
203
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204 saw 1.5 \section{More information about the Quadrupoles}
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205 saw 1.1
206 \subsection{Changing the quadrupole polarity}\label{quadpol}
207
208 The HMS quadrupole polarity can be changed as follows:
209
210 \begin{itemize}
211
212 \item{If the magnet is not at zero current, ramp it to zero
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213 saw 1.4 by typing \texttt{psu:setcur:0.0} in the \texttt{Command Line} box.}
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214 saw 1.1
215 \item{When the magnet reaches zero current, type \texttt{psu:pol:+} or
216 \texttt{psu:pol:-} for positive or negative polarity.}
217
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218 saw 1.5 \item{At its new polarity, ramp the magnet to its maximum current (Q1=950 Amps, Q2=900 Amps, Q3=850 Amps):
219 \texttt{psu:setcur:xxx.x}.}
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220 saw 1.1
221 \item{You can now ramp the magnet down to the desired current:
222 \texttt{psu:setcur:xxx.xx}, \texttt{xxx.xx} is the absolute value of the
223 current desired.}
224
225 \end{itemize}
226
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227 saw 1.2
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228 saw 1.5 \subsection{HMS Quadrupole Interlock Recovery}
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229 saw 1.1
230 Occasionally, an HMS quad power supply will trip off because a real or
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231 saw 1.5 annoyance power supply fault is sensed. Prudent checks of the system temperature,
232 pressure, and liquid level are wise. You should always record any fault
233 indications in the hclog! Once you have determined that the fault is not real
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234 saw 1.1 or that it has been corrected, and that there is no indication of a quench,
235 the power supply may be reset by executing the following commands:
236
237 \begin{itemize}
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238 saw 1.5 \item{Type \texttt{psu:setcur:0.0} in the Command Line box.}
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239 saw 1.3 \item{WAIT for the magnet to finish ramping to zero current/field (if it
240 hasn't already).}
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241 saw 1.1 \item{Type \texttt{reset}.}
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242 saw 1.3 \item{Type \texttt{psu:reset}. All red faults should now be green. If they
243 are not, type \texttt{reset} and \texttt{psu:reset} again.}
244 \item{Type \texttt{psu:on}. Note that the read LED for the magnet alarms
245 (near the target computer) will not go off until this step.}
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246 saw 1.1 \item{Set the magnet to desired current using the procedure described in
247 Section~\ref{quad_set}.}
248 \end{itemize}
249
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250 saw 1.5 \subsection{Quadrupole Quench/Dump Switch Open Interlock}
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251 saw 1.1
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252 saw 1.5 Recovery from a quadrupole quench can be done remotely. There is little
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253 saw 1.1 or no possibility of a ``real" quench occurring in the main coils so one
254 should always reset and continue. Prudent checks of the system temperature,
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255 saw 1.5 pressure and liquid level are wise. You should record any fault indications
256 in the hclog! There have been real quenches of the trim
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257 saw 1.1 coils that subsequently cause enough noise to trip the main coil off. There
258 are other causes of fast discharges but these have all been the result of
259 electrical noise or a detection level set too low. There have been no real
260 quenches observed of any quad main coil. When a quench reset is needed, the
261 dump switch open interlock and main coil quench interlock are shown on the
262 ILK screen of the quadrupole display screen.
263
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264 saw 1.5 To remotely reset the dump switch execute the following steps in the proper
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265 saw 1.1 order:
266
267 \begin{itemize}
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268 saw 1.5 \item{Position the cursor over the {\texttt{ILK}} box and press Enter.}
269 \item{In the Command Line box type \texttt{qreset}. The Main Coil Quench and/or
270 the Current Lead Overvoltage interlock will change to green.}
271 %\item{\texttt{reset}}
272 \item{Wait 7 minutes for the Dump Switch Open interlock to change to green.}
273 \item{Position the cursor over the {\texttt{PSU}} box and press Enter.}
274 \item{Type \texttt{psu:reset}. The MPS OVERTEMP indicator will turn green.}
275 \item{Type \texttt{psu:on} and set the magnet as normal.}
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276 saw 1.1 \end{itemize}
277
278 To manually reset the dump switch at the control rack in the hall (if you have
279 not done this before, try to get some help):
280
281 \begin{itemize}
282 \item{Press RESET buttons on control rack (button \#1).}
283 \item{Press button \#2 on the QUENCH SWITCH.}
284 \item{Press button \#3.}
285 \item{Press button \#4.}
286 \item{(wait seven minutes with rabbit foot)}
287 \item{Press RESET button on control rack (button \#5).}
288 \item{Type 'psu:reset'.}
289 \item{Type 'psu:on'. }
290 \end{itemize}
291
292
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293 saw 1.5 \subsection{Rebooting the HMS quadrupole computers}
294
295 Occasionally, one or more of the magnet control computers will become hung,
296 stop responding, or cease to function. If this is the case, check the hall
297 quadrupole hall probes and dipole NMR readback values on the TV monitors. If
298 they are still at their nominal values, it is NOT necessary to reboot the
299 computer right away. You may wait until some opportune moment, i.e. when
300 changing kinematics or when beam may go away for an extended period.
301
302 When you do decide to reboot the affected PC, first check the Reboot How--to
303 \cite{reboot}. The steps to follow for the quadrupoles are are summarized below.
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304 saw 1.1
305 \begin{itemize}
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306 saw 1.5 \item{Rebooting the quad computer will crash the magnet so make sure
307 you are really ready to reboot!}
308 \item{Go to the screen of the affected computer (NumLock-minus-NumLock, etc.).}
309 \item{Go to the reboot panel (on cdaqs1) and reboot that PC.}
310 \item{The PC will come up with two ``sections''. On startup, the cursor will
311 be in the bottom (blue?) section. Get to the top section by hitting the
312 \texttt{Esc} key. NOTE: If the display remains blank after the reboot and you do not
313 see the startup screen, go to one of the other magnet screens, then back to the screen
314 of the affected computer.}
315 \item{Now you can move the cursor to the "PSU" box - hit ENTER to get to the PSU screen.}
316 \item{The screen will show an "MPS OVERTEMP" fault. This is OK.}
317 \item{If the setcurrent readback value is not 0.0, type \texttt{psu:setcur:0.0} in the Command Line box.
318 The MPS not ready will change from ``Not Ready'' to ``Ready'' when the current is zero.}
319 \item{Type \texttt{psu:reset}. MPS OVERTEMP will change to green.}
320 \item{Wait 7 minutes or until the MPS OVERTEMP changes to red.}
321 \item{Type \texttt{psu:reset}. The MPS OVERTEMP should change to green. If not, repeat \texttt{psu:reset}.}
322 \item{Type \texttt{psu:on} and set the magnet current as you would normally.}
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323 saw 1.1 \end{itemize}
324
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325 saw 1.5 \section{More information about the Dipole}
326
327 \subsection{Turning the dipole power supply on}
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328 saw 1.1
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329 saw 1.5 \begin{itemize}
330 \item{In Hall C, unlock the and turn on the dipole main breaker.}
331 \item{Turn on the dipole power supply switch located on top of the power supply.}
332 \item{Open the center door and press the diode reset button. Close the door.}
333 \item{Press RESET to clear the interlocks on the power supply. NOTE: One interlock will remain red.}
334 \item{Turn the NMR on.}
335 \end{itemize}
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336 saw 1.1
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337 saw 1.5 \subsection{Changing the dipole polarity}
338
339 \begin{itemize}
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340 saw 1.1
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341 saw 1.5 \item{To change the dipole, first let the dipole ramp to zero current - the current can be forced to
342 ramp down quickly by:}
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343 saw 1.1
344 \begin{itemize}
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345 saw 1.5 \item{Position the cursor over the \texttt{Interlock} menu item. Type \texttt{exe} and press
346 ENTER.}
347 \item{Position the cursor over the \texttt{Fast Discharge by user} menu item. Type \texttt{exe} and
348 press ENTER.}
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349 saw 1.1 \end{itemize}
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350 saw 1.5 \item{You can monitor the dipole current in the upper left corner of the \texttt{INTERLOCK}
351 page. Wait until the current readback is zero.}
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352 saw 1.1
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353 saw 1.5 \item{Position the cursor over the \texttt{Reset Interlock} menu item. Type \texttt{exe} and press ENTER.}
354
355 \item{Press F1 (function key \# 1) to return to the Main Menu.}
356
357 \item{Position the cursor over the \texttt{Field Regulation, NMR Manual op.}, or the \texttt{MPS Manuel op.} menu item,
358 depending on which mode is being used. Type \texttt{exe} and press ENTER.}
359
360 \item{Position the cursor over the \texttt{NMR start, PWR on} menu item. Type \texttt{exe} and press ENTER.
361 After approximately one minute the NMR unit is activated. The NMR is on when the status
362 field is white starts on a green background.}
363
364 \item{Position the cursor over the \texttt{Change +/-} menu item. Type \texttt{exe} and press ENTER.}
365
366 \item{Once the polarity has changed, set the dipole using the instructions in
367 Section \ref{setdipole}.}
368
369 \end{itemize}
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370 saw 1.3
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371 saw 1.5
372 \subsection{Dipole Quench Recovery / Interlock Recovery }
373
374 The recovery from a dipole quench ``real or imaginary" can be completely remote. It is wise to check the
375 coil voltages, system temperature, pressure, and liquid levels before restarting. You should always record
376 any fault indications in the hclog! A restart requires the following steps.
377
378 \begin{itemize}
379
380 \item{Position the cursor over the \texttt{Interlock} menu item. Type \texttt{exe} and press ENTER.}
381 \item{Monitor the current value in the upper left corner. Wait until the current read back is zero.}
382 \begin{itemize}
383 \item{The current can be forced to ramp down quickly. Position the cursor over the \texttt{Fast Discharge by
384 user} menu item. Type \texttt{exe} and press ENTER.}
385 \end{itemize}
386 \item{Position the cursor over the \texttt{Reset Interlock menu item}. Type texttt{exe} and press ENTER.}
387 \item{Go to the reboot panel (on cdaqs1) and reset the Dipole Power Supply Diode}
388 \item{Press F1 (function key \# 1) to return to the Main Menu.}
389 \item{Position the cursor over the \texttt{Field Regulation, NMR Manual op.}, or the \texttt{MPS Manual op.} page,
390 depending on the mode of operation being used.}
391 \item{Position the cursor over the \texttt{NMR start, PWR on} menu item, type \texttt{exe} and press ENTER.
392 saw 1.5 After approximately one minute the NMR unit is activated. The NMR is on when the status field is white
393 stars on a green background.}
394 \item{Set desired current or field.}
395 \end{itemize}
396
397 The HMS dipole has never had a real quench. Even the failure of a current lead in October '93 did not
398 quench the coil, according to the Hall C engineering staff. There have been numerous fast/slow discharges
399 and all were due to electrical noise, low trip settings, deliberate operator initiated trips, or interlock
400 dissatisfaction.
401
402 \subsection{HMS Dipole NMR-err / MPS-err}
403 A NMR-err or MPS-err indicates that a communication error has occurred between the control system and
404 the NMR unit and/or the Power Supply. You should always record any fault indications in the hclog!
405
406 \begin{itemize}
407 \item{Set the Magnet alarms (near the target computer) to Bypass.}
408 \item{Position the cursor over the \texttt{Interlock} menu item. Type \texttt{exe} and press ENTER.}
409 \item{Monitor the current value in the upper left corner. Wait until the current read back is zero.}
410 \begin{itemize}
411 \item{The current can be forced to ramp down quickly. Position the cursor over the \texttt{Fast Discharge by
412 user} menu item. Type \texttt{exe} and press ENTER.}
413 saw 1.5 \end{itemize}
414 \item{Press F1 (function key \# 1) to go to the Main Menu.}
415 \item{Position the cursor over the \texttt{Field Regulation, NMR Manual op.}, or the
416 \texttt{MPS Manual op.} page, depending on the mode of operation being used. Type \texttt{exe}
417 and press ENTER.}
418 \item{Position the cursor over the \texttt{RS232 restart} menu item, type \texttt{exe} and press ENTER.}
419 \item{Press F7 (function key \# 7) to go to the \texttt{Device} page.}
420 \item{Wait for all the devices to restart. }
421 \item{Position the cursor over the \texttt{Reset Interlock} menu item. Type \texttt{exe} and press ENTER.}
422 \item{Go to the reboot panel (on cdaqs1) and reset the Dipole Power Supply Diode.}
423 \item{Press F1 (function key \# 1) to return to the Main Menu.}
424 \item{Position the cursor over the \texttt{Field Regulation, NMR Manual op.}, or the \texttt{MPS Manual op.}
425 page, depending on the mode of operation being used. Type \texttt{exe} and press ENTER.}
426 \item{Position the cursor over the \texttt{NMR start, PWR on} menu item, type \texttt{exe} and press ENTER.
427 After approximately one minute the NMR unit is activated. The NMR is on when the status field
428 is white stars on a green background.}
429 \item{The field or current may now be set.}
430 \item{Set the Magnet alarms (near the target computer) to Active.}
431 \end{itemize}
432
433 \subsection{Restricting the NMR }
434 saw 1.5 The NMR unit is very sensitive to electromagnetic interference, so when the unit is searching for the
435 magnetic field the unit will try to lock in on a NMR signal without magnetic field. For most cases the NMR
436 will simply attempt to lock in on the interference for a short period of time, then give up and continue on.
437 However, when ramping the Dipole to high field levels, (0.50 T and above), the NMR unit will try to lock in
438 on several interference signals and may never reach the magnet field set point after several Ramp up-err
439 resets. When this happens it is possible to restrict the number of probes that the NMR will search and
440 improve the probability of obtaining a good field lock. Perform the following steps to restrict the number of
441 probes.
442
443 NOTE: The procedure only works when the Dipole is at zero amps.
444 \begin{itemize}
445 \item{Press F1 (function key \# 1) to go to the Main Menu.}
446 \item{Position the cursor over the \texttt{NMR manual op.} menu item, type \texttt{exe} and press ENTER.}
447 \item{Position the cursor over the \texttt{Multiplexer} menu item, type \texttt{exe} and press ENTER.}
448 \item{Position the cursor over the \texttt{Number of multiplexer channel} menu item, type
449 \texttt{exe} and press ENTER.}
450 \item{Type in \texttt{1}, and press ENTER.}
451 \item{Position the cursor over the \texttt{Start multiplexer channel} menu item, type \texttt{exe}
452 and press ENTER.}
453 \item{Type in the probe number from the chart below, and press ENTER.}
454 NMR Probes:
455 saw 1.5 \begin{tabular}{cc}
456 Probe \# & Range (Tesla) \\
457 2 & 0.09T - 0.26T \\
458 3 & 0.17T - 0.52T \\
459 4 & 0.35T - 1.05T \\
460 5 & 0.70T - 2.10T
461 \end{tabular}
462
463 \item{Position the cursor over the \texttt{Write field multiplexer parameter} menu item, type \texttt{exe} and press
464 ENTER.}
465 \item{Position the cursor over the \texttt{NMR stop, PWR off} menu item, type \texttt{exe} and press ENTER.}
466 \item{Position the cursor over the \texttt{NMR start, PWR on} menu item, type \texttt{exe} and press ENTER.}
467
468 \end{itemize}
469
470 \subsection{Setting the HMS Dipole in current control mode }
471
472 Perform the following steps to operate the dipole in current control mode.
473
474 \subsubsection{MPS Manual operation: Starting from zero.}
475
476 saw 1.5 \begin{itemize}
477 \item{Press F1 (function key \# 1) to go to the Main Menu.}
478 \item{Check the Interlock status, upper right corner of the main menu.
479 If the interlock status field is flashing red:}
480
481 \begin{itemize}
482 \item{Using the arrow keys, position the cursor over the \texttt{Interlock} menu item.
483 Type \texttt{exe} and press ENTER.}
484 \item{Position the cursor over the \texttt{Reset Interlock} menu item. Type \texttt{exe} and press ENTER.}
485 \item{Press F1 to return to the Main Menu.}
486 \end{itemize}
487
488 \item{Position the cursor over the MPS Manual op. menu item. Type EXE and press Enter.}
489 \item{Position the cursor over the \texttt{NMR start, PWR on} menu item, type \texttt{exe} and press ENTER.
490 After approximately one minute the NMR unit is activated.
491 The NMR is on when the status field is white stars on a green background.. }
492 \item{Position the cursor over the \texttt{Set current high} menu item, type \texttt{exe} and press ENTER.}
493 \item{Type high current value 0 to 3000 for integer part of the current in Amps, and press ENTER.}
494 \item{Position the cursor over the \texttt{Set current low} menu item, type \texttt{exe} and press ENTER.}
495 \item{Enter low bit current value 0 to 999 for 0.000 to 0.999 amps.}
496 \item{Position the cursor over the \texttt{Automatic measurements} menu item, type \texttt{exe} and press ENTER.}
497 saw 1.5 \item{Position the cursor over the \texttt{Write set data} menu item, type \texttt{exe} and press ENTER.}
498 \item{The Dipole will now ramp to the desired current.}
499 \end{itemize}
500
501 \subsubsection{MPS Manual operation: Changing the current value}
502 \begin{itemize}
503 \item{Position the cursor over the \texttt{Set current high} menu item, type \texttt{exe} and press ENTER.}
504 \item{Type high current value 0 to 3000 for integer part of the current in Amps, and press ENTER.}
505 \item{Position the cursor over the \texttt{Set current low} menu item, type \texttt{exe} and press ENTER.}
506 \item{Enter low bit current value 0 to 999 for 0.000 to 0.999 amps. }
507 \item{Position the cursor over the \texttt{Write set data} menu item, type \texttt{exe} and press ENTER.}
508 \item{The dipole will now ramp to the new current.}
509 \end{itemize}
510
511 \subsection{Setting the HMS Dipole in NMR Manual operation }
512
513
514 \subsubsection{NMR Manual operation: Starting from zero.}
515 \begin{itemize}
516 \item{Press F1 (function key \#1) to go to the Main Menu.}
517 \item{Check the Interlock status, upper right corner of the main menu.
518 saw 1.5 If the interlock status field is flashing red:}
519 \begin{itemize}
520 \item{Using the arrow keys, position the cursor over the \texttt{Interlock} menu item. Type \texttt{exe} and press
521 ENTER.}
522 \item{Position the cursor over the Reset Interlock menu item. Type \texttt{exe} and press ENTER.}
523 \item{Press F1 to return to the Main Menu.}
524 \end{itemize}
525 \item{Position the cursor over the \texttt{NMR manual op.} menu item, type \texttt{exe} and press ENTER.}
526 \item{Position the cursor over the \texttt{NMR start, PWR on} menu item, type \texttt{exe} and press ENTER.
527 After approximately one minute the NMR unit is activated.
528 The NMR is on when the status field is white stars on a green background.}
529 \item{Position the cursor over the \texttt{Auto Measurement} menu item, type \texttt{exe} and press ENTER.}
530 \item{Position the cursor over the \texttt{Field Target Value} menu item, type \texttt{exe} and press ENTER.
531 The field target value is a 32 bit word split into two 16 bit words, high and low.}
532 \item{Position the cursor over the \texttt{high value} menu item, type \texttt{exe} and press ENTER.}
533 \item{Type in the field target value high word, and press ENTER.
534 (Example: For 1.2345678 T type 1234 )}
535 \item{Position the cursor over the \texttt{low value} menu item, type \texttt{exe} and press ENTER.
536 (Example: For 1.2345678 T type 5678 )}
537 \item{Position the cursor over the Write field target values menu item, type \texttt{exe} and press ENTER.}
538 \item{Wait (The dipole power supply will ramp the magnet.
539 saw 1.5 After the power supply has ramped the magnet, the Searchmode will automatically switch to on.)
540 The NMR unit will search for the field, lock on, and calculate the regulation window. When this
541 calculation is complete, and if successful, the NMR-status 5 will change to 1, and the auto
542 measurements will switch to manual measurement.) }
543 \begin{itemize}
544 \item{If the NMR-status 5 displays a value other than 1 visit the web site \\
545 \texttt{http://www.jlab.org/$\sim$fowler/nmrstatusie.htm} \\ and enter the NMR register values to obtain
546 more details. You should always record any fault indications in the hclog!}
547 \end{itemize}
548 \item{Position the cursor over the \texttt{Auto Measurement} menu item, type \texttt{exe} and press ENTER.}
549 \item{Position the cursor over the \texttt{Field-ctrl ON} menu item, type \texttt{exe} and press ENTER.}
550 \item{Wait ( The Searchmode will automatically switch on, and the NMR will reacquire field lock.
551 The NMR will then make adjustments to the power supply, and if successful, the NMR-status 5
552 will change to 1, and the auto measurements will switch to manual measurement.)}
553 \begin{itemize}
554 \item{If the NMR-status 5 is not set to 1 then an error has occurred.}
555 \item{Position the cursor over the Field-ctrl OFF menu item, type \texttt{exe} and press ENTER.}
556 \item{Return to the previous step (turn \texttt{Field-ctrl ON}).}
557 \end{itemize}
558 \item{Position the cursor over the \texttt{Auto Measurement} menu item, type \texttt{exe} and press ENTER.}
559 \item{Wait (It takes approximately three minutes for the NMR to fine tune the field to the set value.
560 saw 1.5 When the NMR finished, the field the NMR-status 5 will change to 8, and the auto measurements
561 will switch to manual measurement.)}
562 \item{Position the cursor over the \texttt{Auto Measurement} menu item, type \texttt{exe} and press ENTER.}
563 \item{The Dipole is now ready.}
564 \end{itemize}
565
566 \subsubsection{NMR Manual operation: Changing the field target value}
567 \begin{itemize}
568 \item{Position the cursor over the \texttt{Field-ctrl OFF} menu item, type \texttt{exe} and press ENTER.}
569 \item{Position the cursor over the \texttt{Field Target Value} menu item, type \texttt{exe} and press ENTER.}
570 \item{Position the cursor over the \texttt{high value} menu item, type \texttt{exe} and press ENTER.}
571 \item{Type in the field target value high word, and press ENTER.}
572 \item{Position the cursor over the \texttt{low value} menu item, type \texttt{exe} and press ENTER.}
573 \item{Type in the field target value low word, and press ENTER. }
574 \item{Position the cursor over the \texttt{Write field target values} menu item, type \texttt{exe} and press ENTER.}
575 \item{Position the cursor over the \texttt{Auto Measurement} menu item, type \texttt{exe} and press ENTER.}
576 \item{Wait (The dipole power supply will ramp the magnet.
577 After the power supply has ramped the magnet, the Searchmode will automatically switch to on.)
578 The NMR unit will search for the field, lock on, and calculate the regulation window. When this
579 calculation is complete, and if successful, the NMR-status 5 will change to 1, and the auto
580 measurements will switch to manual measurement.)}
581 saw 1.5 \begin{itemize}
582 \item{If the NMR-status 5 is not set to 1 visit the web site \\
583 \texttt{http://www.jlab.org/$\sim$fowler/nmrstatusie.htm}\\ and enter the NMR register values to obtain
584 additional details. You should always record any fault indications in the hclog!}
585 \end{itemize}
586 \item{Position the cursor over the \texttt{Auto Measurement} menu item, type \texttt{exe} and press ENTER.}
587 \item{Position the cursor over the \texttt{Field-ctrl ON} menu item, type \texttt{exe} and press ENTER.}
588 \item{Wait ( The Searchmode will automatically switch on, and the NMR will reacquire field lock.
589 The NMR will then make adjustments to the power supply, and if successful, the NMR-status 5
590 will change to 1, and the auto measurements will switch to manual measurement.)}
591 \begin{itemize}
592 \item{If the NMR-status 5 is not set to 1 then an error has occurred.}
593 \item{Position the cursor over the \texttt{Field-ctrl OFF} menu item, type \texttt{exe} and press ENTER.}
594 \item{Return to the previous step (turn \texttt{Field-ctrl ON}).}
595 \end{itemize}
596 \item{Position the cursor over the \texttt{Auto Measurement} menu item, type \texttt{exe} and press ENTER.}
597 \item{Wait (It takes approximately three minutes for the NMR to fine tune the field to the set value.
598 When the NMR is finished, the NMR-status 5 will change to 8, and the auto measurements will
599 switch to manual measurement.)}
600 \item{Position the cursor over the \texttt{Auto Measurement} menu item, type \texttt{exe} and press ENTER.}
601 \item{The Dipole is now ready.}
602 saw 1.5 \end{itemize}
603
604 \subsection{Rebooting the dipole control computers}
605
606 Occasionally, one or more of the magnet control computers will become hung,
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607 saw 1.3 stop responding, or cease to function. If this is the case, check the hall
608 quadrupole hall probes and dipole NMR readback values on the TV monitors. If
609 they are still at their nominal values, it is NOT necessary to reboot the
610 computer right away. You may wait until some opportune moment, i.e. when
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611 saw 1.5 changing kinematics or when beam may go away for an extended period.
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612 saw 1.3
613 When you do decide to reboot the affected PC, first check the Reboot How--to
614 \cite{reboot}. The steps to follow are summarized below.
615
616 \begin{itemize}
617
618 \item{Rebooting the HMS dipole computer will NOT crash the dipole, so this
619 can be done at any time.}
620
621 \item{Go to the dipole screen (NumLock-minus-NumLock, \texttt{D},
622 \texttt{return}.).}
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623 saw 1.5 \item{Go to the reboot panel (on cdaqs1) and reboot the dipole PC.}
624 \item{If the display remains blank after the reboot, go to a quadrupole screen, then
625 back to the dipole screen.}
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626 saw 1.3 \item{Once the computer has recovered, type \texttt{hms} at the prompt. This
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627 saw 1.5 will start the magnet control program.}
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628 saw 1.3
629 \end{itemize}
630
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631 saw 1.1 \end{document}
632
633 % Revision history:
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634 saw 1.2 % $Log: set_hms_magnets.tex,v $
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635 saw 1.5 % Revision 1.4 2003/06/19 16:19:41 saw
636 % Add wait of 5 minutes after reboot.
637 %
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638 saw 1.4 % Revision 1.3 2003/06/12 16:03:45 saw
639 % (gaskelld) Add sections on how to reboot things + corrections.
640 %
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641 saw 1.3 % Revision 1.2 2003/04/11 02:39:22 saw
642 % (gaskelld) Include preliminary description of how to change HMS polarity
643 %
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644 saw 1.2 % Revision 1.1 2003/04/07 20:50:20 saw
645 % Initial Checkin
646 %
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