Log entry time 16:01:27 on December 16, 2011

Entry number 244703

Day Shift Summary 12/16/2011

Shift Crew:
SL: Fang Guo
TO: R. Beminiwattha
3rd: J. Rajotte
Others: Allena Opper

Priorities for shift:

LH2 production

Angle steering study

Summary of events:

• 8:20     BPM3C12 is saturating, called MCC
• 9;40     Compton turned off
• 9:40     Halo3&4 -- turned HV off
• 10:05   Scitillator HV back on
• 11:15   Change IHWP to OUT
• 11:25   Hall C changed to "controlled access" for access and back to "beam permit" after about 25min.
• 11:53   Halo HV ON
• 12:30   Get good beam @ 180uA
• 14:10   Fast feedback fixed by MCC, previously showed "standby"
• 14:20   Beam off & target moved out of the beam (for angle steering study)
• 14:30   Han does some changes to the DAQ (see his hclog entry for details)  
• 14:30   preparing for Mark's angle steering study

Run list:

• 14467: LH2 production @ 160uA
• 14468: LH2 @10uA , later turn off the compton & halo
• 14469; LH2, turned compton off & halo HV off, basically no beam
• 14470: LH2, no beam, pedestal run
• 14471: LH2, IHWP to OUT before the run starrted, turned halo HV on after the run started
• 14472: LH2, start with 160uA, but quickly lose the beam
• 14473: LH2 production @ 180uA, unstable beam current in the middle for several minutes
• 14474: LH2 production @ 180uA
• 14475- 6:  daq-test by Han

Coulombs acquired: 1.29

Typical operating parameters:

Problems requiring attention:

X

Analysis:

1. 14467
2. 14468
3. 14469
4. 14470
5. 14471
6. 14472
7. 14473
   double peaks are seen in MD PMT yield (fig 9) & downstrean lumi yield (fig 13)
8. 14474

Comments:

1. XXX