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

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

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

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

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

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

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

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

Double Coincidences ep on He4http://www.jlab.org/~adaq/halog/html/1103_archive/110319171117.html

Or Chen

Double Coincidences eN on He4http://www.jlab.org/~adaq/halog/html/1103_archive/110320021801.html

Or Chen

Tripple coincidences ?

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

Carbon datahttp://www.jlab.org/~adaq/halog/html/1103_archive/110322115251.html

HANDBigBite

Deuterium datahttp://www.jlab.org/~adaq/halog/html/1103_archive/110322115251.html

HANDBigBite

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