Log entry time 09:31:28 on February 27, 2009

Entry number 263668

This entry is a followup to: 263544

Followups:

• 263864 02/28/09 12:23 V. Sulkosky Experiment Summary for Feb 27, Owl - Feb 27, Swing

Summary for Feb 26 owl - Feb 26 swing

Smooth data taking at fourth pass, then pass change to fifth.

Beam in Use

shift	ABU	BANU	BNA	ACC
2009/02/26 owl	6.53	0.55	0.9	0
2009/02/26 day	0.34	1.31	5.66	0.69
2009/02/26 swing	4.18	1.99	1.82	0
total	11.1	3.8	8.4	0.7

Main events/issues:

• February 26^th
  • Completed production on kinematic 4J: P_lhrs = 1.51 GeV/c, 45^o.
  • 02:00 Change to kinematic 4C: P_lhrs to 0.8 GeV/c, 45^o.
  • 08:22 Beam studies start early due to North LINAC vacuum problem.
  • Accumulated charge kinematic 4J: 1.14 C out of 1.08 C.
  • Accumulated charge kinematic 4C: 0.25 C out of 0.38 C.
  • 8:30 Controlled access:
    • Spare reference cell mounted.
    • HRS magnet work: Right Q3 now operational and some work on left Q3.
    • BigBite gas Cerenkov gains checked.
    • Target spin rotated to 270^o.
    • Change to kinematic M: P_lhrs to 1.7 GeV/c, 45^o.
  • 10:15 Wien angle change to 30^o and spot move on photocathode.
  • 16:20 Beam tuning for 5^th pass begins.
  • 18:00 Beam tuning complete.
  • 18:00-18:35 Controlled access for BigBite Cerenkov missing TDC channel.
  • 19:00-20:30 N₂ reference cell runs.
  • 19:35 Change to kinematic K: P_lhrs to 1.51 GeV/c, 45^o.
  • 19:49 Begin production for kinematic K.

Plans for the next couple of days:

• February 27^th to March 2^nd: Production on kinematics K, I, G, E and C.
• March 2^nd:
  • 6:30 Controlled Access for left HRS polarity change to +ve.
  • 9:00-17:00 left HRS positron data.
  • 17:00 Controlled access for left HRS polarity change to -ve.
  • 19:00 Moller measurement.
  • 23:00 Resume polarized production at 5^th pass.