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Alexandre Camsonne Hall A meeting March 22 nd 2011

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

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Alexandre Camsonne Hall A meeting March 22 nd 2011

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  1. Short Range CorrelationsE07006Run coordinator reporthttp://www.jlab.org/~camsonne/rc/ SRC-E07006.pdfhttp://www.jlab.org/~camsonne/rc/ SRC-E07006.pptx Alexandre Camsonne Hall A meeting March 22nd 2011

  2. 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

  3. Beam summary • ABU 73 hours • BANU 22 hours • Main reason of BANU • Q1 power supply fixed 4 hours • Target cool down 2hours • Hall C Mollercooldown4 hours • Additionnal delay on BigBite 4 hours • Network 1 hours • HV power supply 1 hour • BNA 65 hours • ARC power supply

  4. 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

  5. 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 Mollercooldown • 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

  6. 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

  7. 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

  8. Retiming ADC amplitude versus TDC http://www.jlab.org/~adaq/halog/html/1103_archive/110316175228.html http://www.jlab.org/~adaq/halog/html/1103_archive/110318231214.html

  9. Double Coincidences ep on He4 http://www.jlab.org/~adaq/halog/html/1103_archive/110319171117.html Or Chen

  10. Double Coincidences eN on He4 http://www.jlab.org/~adaq/halog/html/1103_archive/110320021801.html Or Chen

  11. Tripple coincidences ?

  12. Tripple coincidences ?http://www.jlab.org/~adaq/halog/html/1103_archive/110320165429.htmlIgor Korover Run 2940 - 2947 Total time is ~6.6 hours Total charge ~ 0.093 C

  13. Carbon data http://www.jlab.org/~adaq/halog/html/1103_archive/110322115251.html HAND BigBite

  14. Deuterium data http://www.jlab.org/~adaq/halog/html/1103_archive/110322115251.html HAND BigBite

  15. 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

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