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Hall A RC report

Hall A RC report . X>2 & SRC May 3rd – May 10th, 2011. Xiaohui Zhan Argonne National Lab. May 3 rd – May 8 th : x>2. May 3 rd (Tue.): Continue production at Kin 3.1 (L) and Kin 6.5 (R). Proceed to Kin 4.2 after beam study, smooth production.

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Hall A RC report

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  1. Hall A RC report X>2 & SRC May3rd– May 10th, 2011 Xiaohui Zhan Argonne National Lab

  2. May 3rd – May 8th : x>2 • May 3rd (Tue.): • Continue production at Kin 3.1 (L) and Kin 6.5 (R). • Proceed to Kin 4.2 after beam study, smooth production. • CODA crash, right Q1 tripped once but recovered soon. • Network problem for LeCroy HV IOC. • Fixed the R-HRS movement issue. • May 4th (Wed.): • Production at Kin 4.2. • Bull’s eye scan, proceed to Kin 4.1. • Change to Kin 5.05 • IOC values & Dipole NMR problem.

  3. May 5th (Thu.): • Beam study, access to move BB spectrometer for the prepare of SRC. • Change to Kin 5.0, put sieve in for optics. Preliminary analysis shows sieve hole on right arm (distorted optics due to Q3) • Sieve out and continue production at Kin 5.2. • No major issues. • May 6th (Fri.): • Finish production at Kin 5.2. • Change to Kin 3.1 and finish. • Change to Kin 6.5 (last setting). • HRS magnet control frozen. • NMR lock issue.

  4. May 7th – 8th (Sat. – Sun.): • Continue production at Kin 6.5 • CODA rate issue due to loose trigger cable.

  5. SRC • May 8th (Sun.): • Switch over to SRC from 10am. • Beam pass change: 3->4 • Target warm/Configuration change • HAND/BB cosmics tests • Slanted Carbon run to check doubles • Low current BPM/BCM test over night (ALEX) • Target Vacuum problem.

  6. May 9th (Mon.): • Beam study • Target change/cool down (4He/LD). • Set kinematics L-HRS 3.61GeV/c, R-HRS 1.196 GeV/c • Left Q1 polarity stuck when trying to ramp it up after the target cool down. • R-HRS timing shifts by 60ns, investigation on going… • May 10th (Tue.): • MCC shifts Thursday’s beam study to today (9am – 1pm), both halls have magnets problem. • Controlled access for techs to fix left Q1 • R-HRS timing investigation continues(?)

  7. Plan before beam down • Spectrometer pointing with optics ~0.5 hr. • More carbon data ~1hr to check detectors. • 20 cm 4He with 4uA: check and production. Many thanks to: Howard, Heidi, Jack, Dave, Alex, Bob, …

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