Log entry time 18:46:32 on December 16, 2011

Entry number 244732

Owl:

• Shift summary https://hallcweb.jlab.org/hclog/1112_archive/111216075434.html
• Beam limited to < 50 uA due to Left Dump Ion Chamber  FSD (LDIC-FSD), so at 01:00 it was masked, full beam delivered, unmasked and worked fine ever since.
• Beam ugly and causing HIGH alarms:  W plug differential, W plug water supply, GEM enclosure ion chamber, target upstream ion chamber
• 2 Coulombs of crummy beam with IHWP in

 Day:

• Shift summary  https://hallcweb.jlab.org/hclog/1112_archive/111216160127.html
• Checked W plug water cooling system:  Pressure is okay. Water level is okay. Fan is circulating air.
• Get good beam at 12:30, ~ 180 uA on LH2 till 14:30
• Angle  steering studies

Swing:   Goal = LH2 Production, IHWP = out , need 6.5 hours

• Shift summary
• Good beam established ~ 18:00
• 180 uA on LH2
• W plug scan
• Resume LH2 Production running

Coming Owl:   LH2 Production, IHWP = in, need 8 hours

Saturday Day and Swing:   

• N à Delta for ~ 1 hour 
  • Qtor @ 7000 A,   IHWP = in
• Resume LH2 Production
  • IHWP = in if needed to complete previous set of 8 hours
  • IHWP = out if previous set of 8 hours completed
• Afternoon:   Measure helicity magnet slopes
• Resume LH2 Production, alternating IHWP in/out every 8 hours of beam.

Sunday:

• Owl = LH2 Production
• Day = Moller measurements then LH2 production
• Swing = LH2 Production

Monday:

• Owl = LH2 Production
• Day = Energy Measurement, then Drive position differences with helicity state
• Swing = LH2 Production



Figure 1 Close out plan