Log entry time 12:47:43 on February 17, 2009

Entry number 261625

Followups:

• 262525 02/21/09 17:42 V. Sulkosky Experiment Summary for Feb 20, Owl - Feb 21, Owl

Summary for Feb 16 owl - Feb 17 owl

Smooth data taking until 22:30, then beam instability problems.

Beam in Use

shift	ABU	BANU	BNA
2009/02/16 owl	7.3	0.17	0.53
2009/02/16 day	7.20	0.39	0.42
2009/02/16 swing	5.84	0.64	1.52
2009/02/17 owl	0.0	0.0	8.0
total	20.3	1.2	10.5

Main events/issues:

• Transverse Production
• Feb. 16, beam position and profile check.
• Feb. 16, 01:12-05:30 Complete kinematic M: P_lhrs = 1.7 GeV/c, 45 degrees.
• Left HRS momentum change to 1.6 GeV/c.
• Feb. 16, 05:45 Begin kinematic L: P_lhrs = 1.6 GeV/c, 45 degrees.
• Feb. 16, 17:40 Change target polarization direction to 270 degrees.
• Feb. 16, 22:35 beam instability begins due to Moller quad power supply.
• Feb. 16 22:35 to Feb. 17 08:00 Trouble shooting and fix of beam instability problem.
• Total accummulated charge for kinematic L: 0.76 C out of 1.3 C.

Plans for the next day:

• Beam studies: Monday 8:00-14:00
• Controlled Access until 14:00
• Target polarimetry tests
• Switch to longitudinal polarization
• BCM Calibration
• Nitrogen Reference Cell Run at 135 psig
• Begin longitudinal production 11 hours beam on target
• Insert beam half-wave plate for half of the statistics