Log entry time 07:32:35 on October26,2005

Entry number 158056

♠ Øwl $hift §ummary ♠



0000:0043   taking over from swing shift, HAPPEX run 5895

0015:0137   beam down/trippy, MCC called, klystron problem, see HALOG 158022 and ELOG 1296347

0044:0114   happex run 5896 (cosmic)

0110:0114   moved to "no target" position

0114:0124   beam back, checking spot with SPEC DAQ run 2898 (4x2 mm), ok! see HALOG 158024

0124:0130   moving back to LH2

0130:0137   target ready, MCC is reestablishing the orbit for Hall B, HALOG 158027

0137:0233   beam back, happex run 5897

0233:0329   happex run 5898

0312:0319   MCC called: QE Measurement

0329:0426   happex run 5899

0426:0522   happex run 5900

0517:0534   RQ3 tripped, see HALOG 158041

0522:0620   happex run 5901

0602:0620   beam gone and back, see HALOG 158046 and ELOG 1296363

0620:0711   happex run 5902

0700:0800   beam gone for planned injector studies, see HALOG 158052, moved target to "no target" position

0722:0800   happex run 5903 handed off to day shift



Next production shift should probably flip the HWP before commencing, since we currently have about 589k ok pairs in this slug already.



‡ You don't need a weatherman to know which way the wind OWLS ‡



Arie Beck

Evaristo Cisbani

Jaideep Singh



€xperimental Parameters



beam current = 57.7 ± 0.2 µA (began shift at 56 µA)

target = LH2 in Loop 2 [T=19.00 ± 0.02 K, P=23.7 ± 0.2 psi, ν = 90.90 ± 0.02 Hz]

left  HRS (set) = 3.12340 GeV/c

left  septum (set) = 323.61 A

right HRS (set) = 3.11260 GeV/c

right septum (set) = 316.92 A

sweeper magnet (set) = 111.0 A



ℜuns Summary



happex time   run#  type        BHWP  good pairs

2346:0043     5895  production  OUT   27604

0044:0114     5896  cosmics     OUT   54.7k total events

0137:0233     5897  production  OUT   38546

0233:0329     5898  production  OUT   30288

0330:0426     5899  production  OUT   28264

0426:0522     5900  production  OUT   24967, RQ3 tripped at event 87k, see HALOG 158042

0523:0620     5901  production  OUT   27676, RQ3 recovered by event 20k

0620:0711     5902  production  OUT   22765

0722:xxxx     5903  cosmics	OUT



$hift productivity ≅·0.573

estimated "two-arm" production ≅·0.751 C



compton time        run#    Pe·Pγ or comments

2352:0040           12514   +85.4%, ended early due to beam problems

0137:0156           12515   +90.9%, ended early b/c ROC5 died

0201:0216           12516   +86.2%, ended early b/c ROC5 died

0220:0237           12517   +86.1%, ended early b/c ROC5 died

0240:0449           12518   +86.8%

0453:0627           12519   +86.3%

0631:0711	    12520   +89.9%, ended early b/c beam gone