1 saw   1.1 \documentclass{chowto}
  2           

  3 saw   1.5 \title{Superharp Operation}

  4 saw   1.1 \howtotype{user} % ``expert'', ``user'', ``reference''
  5           %\experiment{Name of experiment} % Optional
  6           \author{M. K. Jones}
  7           \category{beamline} % Subject area of this document
  8           %\maintainer{Name of person maintaining document} % Optional

  9 saw   1.3 \date{July 7, 2003} % Can use \today as the argument

 10 saw   1.1 
 11           \begin{document}
 12           
 13           \begin{abstract}
 14           Describes how to take and analyze superharp data.
 15           \end{abstract}
 16           
 17           \section{Introduction}

 18 saw   1.5 This document is derived from the G0 superharp How-to by Junho Yun.
 19           
 20           For more information about the super harp system, see the reference
 21           ``Hall C Superharp System''\cite{howto:superharp_system} by Chen Yan.

 22 saw   1.1 
 23           \section{Data taking}
 24           
 25           \begin{enumerate}
 26           

 27 saw   1.4 \item Make sure beam is stable and 5 $\mu$A or less. For rastered
 28           beam one can use up to 10~$\mu$A , but first try with 5~$\mu$A.
 29           Let MCC know

 30 saw   1.1 that you are planning to do a scan.
 31           
 32           \item {\it ssh cvxwrks@cdaqh1} with cdaq password
 33           
 34           \item {\it cd g0superharp}
 35           \item {\it cd scan\_data/spring03} and make a new directory for the

 36 saw   1.2 new date and run number of the data run. e.g. mkdir apr\_01\_03\_runnumber

 37 saw   1.1 
 38           \item {\it cd ../..} , so you are in the g0superharp directory.
 39           
 40           \item type {\it harp\_launch}
 41           
 42           \item In the GUI click on Calculate and choose Scan. A small medm window
 43           will appear. Click on the {\it execute} button and then open the file
 44           {\it Harp\_MEDM/g0superharp.adl } using the {\it file } menu. Then you will
 45           get a GUI with the Superharp. For each superharp scan desired.
 46           
 47           \begin{enumerate}
 48           \item Click on blue button near desired superharp
 49           \item Another gui pops up, click on the red scan button and then wait until
 50           ``Declared zero point harp position'' is displayed. Kill screen after scan
 51           is done.
 52           \end{enumerate} 
 53           
 54           \item Now from the main GUI type {\it spring03} in the Experiment window
 55           and the directory name ( that you set above) in the Filename window.
 56           
 57           \item Click on File menu and select Load New Data.
 58 saw   1.1 
 59           \item Click on yellow button with one of the harp names and select
 60           from the list which harp you want to look at. To clear screen
 61           click on File menu and choose Reset. 
 62           
 63           \end{enumerate}
 64           

 65 saw   1.2 \section{Analyze harps near target}
 66           \begin{enumerate}
 67           \item Assuming that you are in the g0superharp directory on cdaqh1
 68           \item Type: make\_harp\_file {\it directory\_name} {\it run\_number} 
 69           \item Type: use cernlib/2000

 70 saw   1.4 \item Type: paw

 71 saw   1.3 \item Depending if beam was unrastered or rastered. If the beam was unrastered and 
 72           one wants to fit with a Gaussian then add {\it fit=yes} when 
 73           execute  plot\_harp.kumac in next step. If the beam was rastered then
 74           execute with {\it fit=no}.
 75           \item In paw++ Executive window type: exec plot\_harp harpname=IHA3H00\_{\it runnum} fit={\it yes or no}
 76           \item A plot of the raw harp scan is shown. Click with left mouse to make gates around each peak.
 77           Click the right mouse to quit.  
 78           The first peak is the x1 wire, the second is the y wire and the third is the x2 wire.
 79           The program has offsets for each wire ( for spring 2003 these were determined
 80           by comparison to the BPMs). For each of the following plots, the offset for that wire is
 81           subtracted from the raw data and for the X1 and X2 the sign is reversed to agree the 
 82           BPM sign conventions.
 83           \item Then the x1 plot appears. If not doing a fit the
 84            left click at the lower left, center and upper left of the peak (click with right
 85           mouse to quit). The kumac will return
 86           the difference between the first and last position and the center position. For a

 87 saw   1.4 fit make a click in the flat region below the peak, at the left base of the peak,
 88           at the top peak ( the y position
 89           is used as the starting height), at the right base of the peak and  in the

 90 saw   1.3 flat region above the peak .
 91           The fit is a constant background plus a Gaussian. 
 92           Unfortunately fitting with PAW can sometimes have problems, and you just have do it
 93           again. If you get a negative number for sigma you can just take the absolute
 94           value since PAW uses the square and is insensitive to the sign. All units are mm.
 95           \item Then the y plot appears. Do as for x1 plot.
 96           \item Then the x2 plot appears. Do as for x1 plot.

 97 saw   1.2 \end{enumerate}
 98           

 99 saw   1.1 \end{document}
100           
101           % Revision history:

102 saw   1.2 % $Log: superharp.tex,v $

103 saw   1.5 % Revision 1.4  2003/07/09 17:46:24  saw
104           % (jones) Some corrections
105           %

106 saw   1.4 % Revision 1.3  2003/07/07 20:30:53  saw
107           % (jones) Add detail for paw++ analysis
108           %

109 saw   1.3 % Revision 1.2  2003/04/10 16:50:07  saw
110           % (jones) Add procedure for harps near target
111           %

112 saw   1.2 % Revision 1.1  2003/04/07 20:47:53  saw
113           % Initial checkin
114           %