Log entry time 07:45:21 on November 7,2005

Entry number 159377

Owl Shift Summary

Taking production.  Since 2314 11/06/05, Hall B has been down b/c of "laser lock issues."

At 0526, beam is gone for injector access to fix hall B laser problems.

We didn't get a chance to do a profile scan.



Owl Shift Log



0000:0032   Taking over happex run 6223 from swing shift

0032:0128   happex run 6224

0128:0225   happex run 6225

0225:0321   happex run 6226

0243        noticed that runbird had wrong parity run number, HALOG 159352

0321:0354   happex run 6227, ended early b/c we lost left HRS

0354:0416   happex run 6228, right only while left HRS recovers, HALOG 159364

0416:0512   happex run 6229, back to "two-arm" production

0512:0526   happex run 6230, ended early b/c beam gone for injector access, HALOG 159369

0526:0736   happex runs 6231,6232,6233 are cosmic

0736:0800   preparing to return to production



People on Shift



Franco Garibaldi

Jaideep Singh



Experimental Parameters



beam current = 57.5 +/- 0.2 microamps

target = LH2 in Loop 2 [T = 19.00 +/- 0.02 K, P = 23.9 +/- 0.2 psi, fan frequency = 90.92 +/- 0.02 Hz]

left  HRS (set) = 3.12340 GeV/c          right HRS (set) = 3.11260 GeV/c

left  septum (set) = 323.61 A            right septum (set) = 316.92 A

sweeper magnet (set) = 111.0 A



Runs Summary



happex time   run#  type        BHWP  equivalent "ok" two-arm pairs

2336:0032     6223  production  IN    42169, no Hall B

0033:0128     6224  production  IN    37717, a few helicity errors and no Hall B

0129:0225     6225  production  IN    39319, a few missing dithering slope histogram from prompt, no hall B

0225:0321     6226  production  IN    43150, a few helicity errors and no hall B

0321:0354     6227  production  IN    24755, ened early b/c lost left HRS, no hall B

0355:0416     6228  production  IN     5378, right arm only, no hall B

0417:0512     6229  production  IN    43400, no hall B

0513:0526     6230  production  IN     7452, ended early b/c beam gone, no hall B

0528:0624     6231  cosmic      IN    100k events

0624:0720     6232  cosmic      IN    100k events

0720:0736     6233  cosmic      IN    27.5k events, ended early in anticipation of beam



total number of "ok" pairs     =  243.3405 kilopairs

estimated "two-arm" production =  0.908 C

estimated shift productivity   =  0.608



compton time  run#    (beam polarization)*(photon polarization) [stat err only] or comments

2339:0145     12734   -(85.3 +/0 0.5)%, end run failed, so coda reboot

0203:0414     12735   -(84.8 +/- 0.5)%, ROC5 died at the end and end run failed, so coda reboot

0427:0526     12736   -(86.3 +/- 0.9)%, end early b/c beam gone, end run failed so coda reboot