Log entry time 18:55:36 on June 13, 2009

Entry number 281092

Followups:

• 281103 06/13/09 19:33 V. Sulkosky Experiment Summary for June 10 owl - June 10 swing

Summary for June 11 owl - June 12 swing

Completed 2^nd pass production running and switched to 3^rd pass.

Beam in Use

shift	ABU	BANU	BNA
2009/01/11 owl	6.14	0.42	1.43
2009/01/11 day	0.76	0.18*	7.06*
2009/01/11 swing	3.27	2.47*	2.26*
2009/01/12 owl	6.50	0.48	1.04
2009/01/12 day	0.00	1.08	6.92
2009/01/12 swing	3.96	2.15	1.90
total	20.6	6.8	20.6

* These numbers are corrected compared to the shift leader submitted numbers.

Main events/issues:

June 11, 2009

• BHWP: IN, Target spin: Longitudinal
• Continue ³He(e,e'd) production for left HRS.
• 00:05 Set right HRS P₀ = 0.7 GeV/c for PVDIS test plan.
• 02:27-02:46 Beam down due to IOCHA1.
• 03:00 Right dipole finally set.
• 09:10-17:45 Contolled Access:
  • Neutron detector moved to 54^o and 8 m from target.
  • Installed right and left HRS sieve-slits.
  • Removed Deuterium bottle and connected hydrogen gas bottle.
  • Compton work.
• Right momentum set to 2.175 GeV/c.
• 10:00-17:00 Beam studies and shed load power test.
• 18:00-19:32 HRS optics studies.
• 19:35-20:10 Contolled access:
  • Remove HRS sieve-slits.
  • Insert BigBite sieve-slit.
• 20:10-22:30 BigBite optics studies.
• 22:32-23:00 Controlled access to remove BigBite sieve-slit.
• 23:00-24:00 Reference cell data: empty, N₂ and ³He.
• Average target polarization for June 11^th: 62.1%.

• BHWP: IN, Target spin: Longitudinal
• 00:30-07:35 Continue ³He(e,e'd) production for left HRS.
• Begin production for right HRS in dip region: P₀ = 2.025 GeV/c.
• 07:35-08:46 QE measurement of cathode and spot move.
• 08:00 Change right and left P₀ = 3.0855 GeV/c.
• 08:33-09:55 Controlled access to move spectrometers:
  • Right HRS moved to 17^o.
  • Left HRS bogie controls unresponsive. Decided to leave at 12.5^o.
  • Left HRS P₀ set to 3.35 GeV/c.
• 09:30-16:00 Pass change from 2^nd to 3^rd.
• 10:45-12:05 Controlled access to rest HV crates.
• 16:00-18:25 Beam tuning and profile check out.
• 18:25 Begin 3^rd pass production at 10 uA.
  • Right HRS: QE ³He(e,e'n) for G_Eⁿ measurement.
  • Left HRS: QE ³He(e,e'), ³He(e,e'p) and ³He(e,e'd) measurements.
• 20:28-21:08 Controlled access for Compton work.
• 21:26 Resume production on polarized ³He.
• 23:50 Right HRS dipole appears to have quenched taking right Q1, Q3 and left Q1 and the dipole out with it.
• Waiting for liquid levels to restore to normal values.
• Average target polarization for June 12^th: 64.7%.