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User name Eric Voutier
Log entry time 00:08:00 on March23,2007
Entry number 196995
keyword=Shift summary
Crew on Shift : Ramesh Subedi, Eric Voutier
--------------
16:00 Starting shift with no beam and empty target in place
17:55 Moving the right spectrometer to kin08 at 77.30 degres
18:17 Beam back to the hall with 3.8 10^-5 energy spread at 40 uA
MCC is making an HARP scan to check the beam spot size
ELOG # 1365620 sigma_y = 0.12 +/- 0.04 mm
18:29 Move lead target number 3 in
19:15 Notice very weird beam tune on BPM A; Mark suggests to go back
on carbon and investigate what is going on with this
19:22 Carbon in place, asking 40 uA...
The spot information is shifted on BPM A but looks similar to
previous values in epics. Spot_L and Spot_R gives similar
information but just inverse (detector map problem a priori).
Bob was informed but he does not have any idea on what is going
on...
We finally decided to believe epics and move back on carbon
20:07 Going back to lead target and data production
20:34 Injector drops to restricted access
21:26 MCC ready for beam delivery, we are on escorted access to
fix the BCM cable.
21:35 Had an access to troubleshoot possible cable problem on BPM
A readout in the left arm; now ready to take beam back
Target ---> meanwhile, had ESR alarms, reboot the target computer
and reduce JT valve
21:51 Check the Spot_L once again; the hall access did not solve the
problem on BPM A readout.
22:39 Beam is back
Run History
-----------
- Kin 08 right arm is 77.301 degres at 0.989 GeV/c
1830 ... 10 uA Those runs might be used but the beam tune is
1831 ... 20 uA weird.
1832 ... 10 uA .... runs are ok, it was a readout problem
1833 ... 40 uA Carbon target / beam optic test
1834 ... 10 uA Lead 0.007667 C 0.007667
1835 ... 20 uA Lead 0.008949 C 0.016616
1836 ... 10 uA Lead
20 uA Lead 0.019340 C 0.035956
1837 ... 40 uA Lead 0.017910 C 0.053866
early stop because of beam off, but data ok
1838 ... 40 uA Lead 0.046400 C 0.100266
1839 ... 40 uA Lead 0.045600 C 0.145866
1840 ... 40 uA Lead 0.045580 C 0.191446
1841 ... 40 uA Lead 0.046490 C 0.237936