alexandre camsonne hall a meeting march 22 nd 2011
DESCRIPTION
Short Range Correlations E07006 Run coordinator report http://www.jlab.org/~camsonne/rc/ SRC-E07006.pdf http://www.jlab.org/~camsonne/rc/ SRC-E07006.pptx. Alexandre Camsonne Hall A meeting March 22 nd 2011. Plan for this week. Production for tripple coincidence on He4 - PowerPoint PPT PresentationTRANSCRIPT
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Short Range CorrelationsE07006
Run coordinator report http://www.jlab.org/~camsonne/rc/ SRC-E07006.pdfhttp://www.jlab.org/~camsonne/rc/ SRC-E07006.pptx
Alexandre CamsonneHall A meeting
March 22nd 2011
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Plan for this week
• Production for tripple coincidence on He4– Left HRS 20.3 degrees 3.6014 GeV/c– Right HRS 33.5 degrees 1.3825 GeV/c
Small issue with right arm had to increase momentum to have regulation working on Q1
– BigBite 97 degrees 518 A– HAND at 97 degrees
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Beam summary
• ABU 73 hours• BANU 22 hours– Main reason of BANU
• Q1 power supply fixed 4 hours• Target cool down 2hours• Hall C Moller cooldown 4 hours• Additionnal delay on BigBite 4 hours• Network 1 hours• HV power supply 1 hour
• BNA 65 hours– ARC power supply
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Q1 power suply
• Jack found that Q1 power supply phases were not correct
• Swapped the phases• Q1 fixed can be ramped to 4 GeV/c without
problem
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Target• Waited for Hall C cool down to pressurize He cell• Beam studies moved to Wednesday• Hall A He target pressurized on Thursday• Moller cool down impact 15 K supply temperature
so stopped beam during Moller cooldown• One trick to keep Hall A supply low is having also
using more 15 K flow• Target vented on Monday around 4 PM, fan
tripped and heater put power in the loop and the target vented. TO needs to keep an eye on it
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Production data
• Wednesday and Thursday owl : production on reduced pressure target
• Friday owl production on fully pressurized target– Carbon optics during Hall C cool down– Deuterium run 3 hours– Carbon– He4 production 1.1 C with bad timing 0.2 C since
timing fixed
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DAQ issues
• Puzzling fact we did not see any signal in BigBite at the lower Q2 and on Deuterium
• Timing spectrum not fully understood and difficult to check with low rate of event– Stop of TDC were found to be L1A instead of
retiming– BigBite retiming arriving too late
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RetimingADC amplitude versus TDC
http://www.jlab.org/~adaq/halog/html/1103_archive/110316175228.htmlhttp://www.jlab.org/~adaq/halog/html/1103_archive/110318231214.html
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Double Coincidences ep on He4http://www.jlab.org/~adaq/halog/html/1103_archive/110319171117.html
Or Chen
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Double Coincidences eN on He4http://www.jlab.org/~adaq/halog/html/1103_archive/110320021801.html
Or Chen
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Tripple coincidences ?
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Tripple coincidences ? http://www.jlab.org/~adaq/halog/html/1103_archive/110320165429.html
Igor Korover
Run 2940 - 2947
Total time is ~6.6 hours
Total charge ~ 0.093 C
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Carbon datahttp://www.jlab.org/~adaq/halog/html/1103_archive/110322115251.html
HANDBigBite
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Deuterium datahttp://www.jlab.org/~adaq/halog/html/1103_archive/110322115251.html
HANDBigBite
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Conclusion
• The good– Left Q1 fixed– DAQ timing understood and fixed. Thanks to the help of
Xin, Brad, Aidan and Larry • The bad– Very few statistics on production kinematic about 6
hours . Long accelerator down did not help• Overall– Ready for production still need to find optimal current
to optimize signal over background