Cryogenic Target System
Target Systems:
QWeak TargetStandard Pivot Targets
Older Experiments:
Qweak Target (May, 2010)
- Documents:
Online Target Training Test:
http://www.jlab.org/div_dept/train/Q-weak/SAF112Q/index.html
- The Qweak target design and safety document: A comprehensive document describing the details of the target design and safety calculations.
- The Qweak target training requirements: The novel training requirements for Qweak target operators.
- A list
of Qweak collaborators who are target trained, and when they
completed each part of their training.
- Qweak target essential responsibilities: A list of everything you are supposed to know how to do.
- Qweak Target
operator How-tos: A brief
explanation of how to do those things you're supposed to know how to
do. (Still under construction).
- Qweak LH2 target OSP.
- Qweak pump and procedures: Powerpoint file showing procedures schematically, or step-by-step procedures in a word file.
- Checklist
for the HMS valve configuration during Qweak
- Qweak target gas
handling procedures. For
experts only.
- Control
System (GUI) Guide. This is for the old control system. A new one
for the Qweak GUIs has not yet been written.
- Warmup/Cooldown procedure (for experts) and an ESR Simplified Flow Sheet.
- Draft of the cryo group's cooldown
procedures for Qweak.
- Target Problems (FAQ) and useful logbook entries.
- MCC's Qweak ion chamber functionality procedures
- MCC's Qweak ion chamber calibration procedures
- Some pictures
of the target
- Emergency
Procedures (quick reference):
- Manuals:
- Sorenson high power heater power supply manual.
- Target lifter EC5 users manual.
- 6961 controller manual for the target lifter.
- Lakeshore 218 manual for the temperature controllers.
- Turbopump
manual (2nd half is in English). My "How-to" reset a
turbopump.
- Horizontal motion calibration info from Silviu.
- Pump controller manual
for the LH2 fan/reciculation pump (Elite microdrive controller).
- Turbopumps:
- The manual link is on the line above this.
- A few sentences of guidance on how to reset a turbopump are here.
- To check (vacuum and) pump status, bring up monticello (for example, type /home/poltar/edmmonticello on poltarcc as poltar).
- Then click the gold button on the vacuum row.
- That brings up the valve commander. In the upper left corner
is a shaded box with a button labelled "Halls". Click that button to
bring up a menu list, choose the one that says "Hall C (Qweak)".
- Now you have a GUI (/cs/opshome/edm/vac/VAC_O_hallCQweak.edl)
which shows you the vacuum and the turbopump status at the scattering
chamber, the vacuum dump tank, the downstream beamline, and the
upstream beamline.
- You can request MCC to isolate the scattering chamber vacuum by closing the upstream valve VBV3H09B and the downstream (16" gate) valve VBV3H09D. Doing this one valve at a time can help tell you where the problem might be, but the Qweak vacuum GUI should also tell you- the turbopump boxes are red if the pump is off, and green if the pump is on.
- It can happen that the valve to the backing pump closes. Symptoms are that the vacuum is steadily worsening, but that there is no load shown on the turbocontrollers. This means the gate valves right at the turbopumps are closed. The buttons to open (or close) these valves (they go together) are about chest high, maybe a meter to the right of the backing pump on the 2nd floor of the blue platform.
- Hydrogen recirculation Pump/Fan:
- If it trips, turn off the beam and try to reset it from the
pump GUI: (reset, then clear, then update). Make sure the pump tach
read from the TV camera is reading near 30 Hz.
- For more things you can try to do, click here.
- Links:
- Qweak document database, target section.
- Hall C logbook.
- Qweak wiki
- Qweak webserver
- Qweak homepage
- Qweak shift schedule
- Qweak Elog
- Qweak glossary
- Hall C survey
reports
- EXPERTS
- Names, pagers,
phone numbers of who to call in what order in a crisis. Also contains
other useful phone numbers (MCC, RadCon, RC, PD, etc.).
- Notes on paging:
- When you page someone, it generally takes a couple minutes for the page to be received, and another minute or two for that person to get to a phone. If you have not gotten a call back within 5 minutes, assume the page was not received and try another number or the next person on the call list.
- To
page:
- By email: send an email to (for example) smithg-page@jlab.org.
- By phone: dial (9) 435-page (435-7243) and then when prompted enter the 10 digit phone number, for example 757 327 5443 followed by the pound key.
- From
a web browser: go to http://www1.jlab.org/mis/staff/staffsearch.cfm
, search for the person, and click on the "click to page" field.
- On-Call list:
-
Name
Work
Pager
Cell
Home
Greg Smith
269-5405
327-5443 871-4371
565-9883
Silviu Covrig
269-6410
(843) 697-1753
394-1187
Dave Meekins
269-5434
327-5491
874-4750
Chris Keith
269-5878
327-5527
Josh Pierce
269-5036
327-5478
Jim Dunne
269-6928
(662) 418-8322
- Goal Parameters -
- Temperature: 20 K ± 0.01 K.
- Pressure: 30-35 psia (~20 psig).
- Pump frequency: 30 Hz.
- Minimum heater power: 100 W.
- Raster ON at 4x4 mm^2.
- Note:
- Hydrogen freezes at 14 K. At the operating pressure of 35 psia, it boils at 23.6 K.
- Never allow the target to go
sub-atmospheric. Keep it well above 20 psia at all times.
- Cooling:
- Qweak cooling power budget, and graph of coolant mass flow versus cooling power required.
- Qweak cryocan connections.
- Qweak ESR scheme.
- P&I drawing of target cryo connections & gas panel.
- Msc:
-
<>
- EPICS dictionary - A list of the target's EPICS variables, with descriptions, to help you find things with the archiver.
- Target & Window Thicknesses:
- The LH2 target is ~34.5 cm thick (4.0%) of LH2.
- The upstream target cell window is 3.8 mils thick 7075
aluminum. (#7).
- The upstream dummy tgts were made from the same block of
metal as all of these windows were made from.
- The downstream target cell window was 4.4 mils 7075 aluminum in
the 15 mm diameter nipple, and 21-24 mils thick everywhere else.
Because of a leak that developed right before installation, the "old"
exit window #3 was put in instead, it's around 5 mils thick. More
precise measurements to follow...
- The downstream dummy tgts were made from the same block of
metal as the 4.4 mil window were made from. This is not the same block
as the old window #3 that we are using, however it is the same alloy.
- This exit window that got replaced at the last minute was one
of two that came in June 2010, it was polished on one side (vacuum
side). The window that arrived with it failed the certification
test. We still have an older window that was not polished as a spare-
it got put in at the last minute. Finally, a new window is now being
made so we will have a 2nd spare.
- Solid target frame dimensioned drawings: Sheet 1 2 3 4 5
- Solid target geometrical
layout cartoon, looking downstream. Solid target thermometer
locations.
- Solid Target Scheme 3D cartoon, including numbering scheme
- Solid target list with thickness measurements, weights, etc.: (Excel
file)
- The vacuum window thickness is nominally 35 mils. See OCE
drawing 67503-00098, and this report.
- Dump window (see OCE drawing 67503-00128): and this report.
- vacuum side 30 mils thick aluminum
- downstream helium side 20 mils thick aluminum
- nominal window diameter 4.5" (thin part)
- water thickness between the windows approximately 1"
- Mildly useful references:
- Thermophysical properties:
- of para-hydrogen
at 24 psia
- of helium at 1.2 atm near 15K
- Other Useful Links (JLab links)
Standard Pivot Targets (Spring-07)
- Documents:
- Target operator essential responsibilities : A list of everything you are supposed to know how to do. Includes expert phone/pager numbers.
- Target operator How-tos: A brief explanation of how to do those things you're supposed to know how to do.
- Control System (GUI) Guide
- Hall
C Cryo-Target Manual (old... out of date but still a useful
reference for some things)
Or download: (pdf) or (ps) - Warmup/Cooldown procedure (for experts) and an ESR Simplified Flow Sheet
- Target Problems (FAQ) and useful logbook entries
- Hydrogen Target Safety Assessment Document (word,
pdf)
- EXPERTS - Names, pagers, phone numbers of who to call in what order in a crisis.
- On-Call list: The primary person (top of the call list) for spring, 2008 is:
-
On-Call
Pager
Start Date End Date Greg Smith
584-5405
May 1
Peter Bosted
584-5985
May 1
May 21
Greg Smith
584-5405 May 21
June 2
Peter Bosted
584-5985 June 2
June 8
- Goal Parameters - Loop1=LH2, Loop2=empty, Loop3=empty . More detailed target specs are here. <>Graphs of P_beam vs I_beam , and of the auxillary high power heater pot setting vs HPH power (same with bigger scale here )
The
target training talk
slides (for Gep, 2007)
- Hall
C logbook
- Target archiver/logger display
- EPICS
dictionary - A
list of the target's EPICS variables, with descriptions, to help you
find things with the archiver.
- Gas flow diagram for the Hall C target system: Best one in jpg, OR in ps: (part 1) and (part 2)
- Gep Target Thickesses for:
- Spring 07
- SP04 (XEMPT-04)
- Spring04 (XEMPT-04) Target thicknessess, pictures, etc.
- XEMPT- summer 04 temperature
calibrations & corrections
- Thicknesses of 1% Targets installed Jan., 2005
- SP03:
- Cell Thickness measurements for the Spring-03 expt.s
- Dummy & cell thickness measurements from D. Meekins for the Spring-03 expts. in inches.
- Thickness measurements from D. Meekins for Spring-03, in mm. (Same as above, but in mm instead of inches).
- Optics Sled (mechanical drawing)
- Useful references:
- Thermophysical properties:
- of para-hydrogen
at 24 psia
- of deuterium
at 24 psia
- of helium at 1.2 atm near 15K
- Other Useful Links (JLab links)
Logger/Archiver: Link to the EPICS archiver of the target data
logger
G0 Logbook and the Backangle ELOG
G0 Target Preliminary Design Document
G0 Target Manuals
Current Limits (Operational Restrictions) on the G0 Targets
Warmup/Cooldown procedure (for experts) and an ESR Simplified Flow Sheet
Target Problems and FAQ and useful logbook entries
Target Beam Studies , etc. ala Silviu
Other Useful Links (JLab links)
Some cell dimensions for Louis
Some window thickness measurements
Wiring Notes
Backangle Target Thicknesses, Encoder Values, etc.
Gas Flow/Plumbing Diagram of G0 Backward in Hall C
Backangle Layout/Dimensions of target in SMS (note: we think the target is 17mm further upstream than indicated in this drawing)
Backangle Target Alignment, Survey, & Position Calibration document
Dummy Frame Drawings one and two
G0 Logbook and the Backangle ELOG
G0 Target Preliminary Design Document
G0 Target Manuals
- README
- G0 Target How-tos
- G0 Target OSP
- G0 Target Gas Handling Users Guide
- G0 Target Control System Manual
- New 1.2 kW DCS40-30EM1 40V, 30A DC HPH power supply manual (11/05)
- The G0 Target NIM
paper
Current Limits (Operational Restrictions) on the G0 Targets
Warmup/Cooldown procedure (for experts) and an ESR Simplified Flow Sheet
Target Problems and FAQ and useful logbook entries
Target Beam Studies , etc. ala Silviu
Other Useful Links (JLab links)
Some cell dimensions for Louis
Some window thickness measurements
Wiring Notes
Backangle Target Thicknesses, Encoder Values, etc.
Gas Flow/Plumbing Diagram of G0 Backward in Hall C
Backangle Layout/Dimensions of target in SMS (note: we think the target is 17mm further upstream than indicated in this drawing)
Backangle Target Alignment, Survey, & Position Calibration document
Dummy Frame Drawings one and two