Log entry time 00:19:05 on November 27, 2011

Entry number 240785

Shift Leader: D. Armstrong
Target Operator: J. Birchall
Guests: Michael Gericke, Dave Gaskell, Ramesh Subedi, Jim Dowd, Mark Pitt

16:00 - Shift starts

Present Conditions:

• 150 µA
• Beam Energy = 1157.5 MeV (Tiefenbach); 2-pass beam.
• QTor on at 8900.2 A (as read from DCCT)
• Hall A is off; Hall B on/off
• Raster = 4mm x 4mm
• lH₂ Target in; 500 W on High Power Heater; 28.5 Hz fan speed (tach)
• Golden beam positions: H07C (x,y) = (1.22, 2.00), H09B (x,y) = (0.07, 0.04) mm
• Charge Feedback on
• HallC FastFeedback on.
• Beam Modulation Off
• Charge Asymmetry width - 600 ppm
• 3C12x (energy) - doubled-peaked, 0.0362 mm width
• MDallbars width (normalized by BCM1&2): 267 ppm
• Halo 3 normalized rate: 10 Hz/µA
• Halo 4 normalized rate: 41 Hz/µA
• Halo target retracted
• Compton Photon detector and Electron detector on, beam is through chicane; 1573 W in cavity
• Normalized Compton Scintillator rate = 47 Hz/µA
• Photon Detector rate (laser off=590 Hz/µA; laser on =1250 Hz/µA)
• Check DataTracker - up to date
• Online MDALLbar sensitivities large - of order 2000 ppm/mm for both x and y
• IHWP = IN; RWHP = 6479

- 18:55 QTor trips. Lose 15 minutes of beam including ramp back up. .
- 22:10 Shift Checklist filled in. Cleaned up food table.
- 23:03 Set IHWP to OUT
- 23:07 Large charge asymmetry at start of run.
- 23:13 Ended run 13874, then CODA problems. End up calling Jeong Han (sorry!).
- 23:44 back to production again

Parity Runs Taken

Run #

13867
13868
13869  QTor trip at end of run
13870
13871
13872
13873
13874  IHWP to OUT; transition run (large charge asymmetry)
13875  

Run #

22649  (junk - laser control error)
22650  (long run - 2 hours... ooops...)
22651
22652
22653
22654
22655
22656