1. 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

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 Moller cooldown 4 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 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

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.html Igor Korover http://www.jlab.org/~adaq/halog/html/1103_archive/110320165429.html 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