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User name Eric Voutier
Log entry time 08:00:00 on March 8,2000
Entry number 35889
keyword=Shift summary
New crew on shift: Eric Voutier, Marat Rvachev, Mike Finn
***************
00:05 Frozen screen on Loop1 chart, Marat is rebooting IOC, temperature
is stable at 6.3K, data taking continues
02:15 Moving sieve slits in (~10 mn)
The sieve slits run is not satisfacting... in fact, it appears that for this energy the
electrons going through the collimator are loosing about 10 MeV that is not enough
to move away from the momentum acceptance.
02:35 Asking for 5 uA to check beam spot and OTR.
02:50 Moving to dummy target to perform the HARP scan without raster
02:55 Performing HARP scan (entry # 35880) the beam spot is 102um/111um;
OTR is also adjusted since the x width was a little bit higher than .2, we are now
having 0.135/0.075 for the x/y widths.
03:05 Changing configuration (target, FFB, beam etc...) for He3 data taking.
03:25 Back to data taking
06:11 We notice that the average current is slowly decreasing all along the night; we
ask MCC to increase the current to 110uA; 100++uA is the final deal to get a stable
beam without trip
-# Run history
... 2677 ...... 23:40 / 00:57 ...... 1.498 M ...... 454 mC ...... good run
... 2678 ...... 00:57 / 02:14 ...... 1.499 M ...... 453 mC ...... good run
... 2679 ...... Sieve slits measurement (502 k events)
... 2680 ...... 03:24 / 04:44 ...... 1.499 M ...... 455 mC ...... good run
... 2681 ...... 04:45 / 06:03 ...... 1.498 M ...... 453 mC ...... good run
... 2682 ...... 06:03 / 07:18 ......
... 2683 ...... 07:18 starting will end next shift
Data analysis is performed with espace_kumac/5 to filter type 5 events and allow
for the analysis of the total run:
i) need more statistics to estimate the 2bbu counting rate
ii) the 2 peaks problem in the Tc_cor spectra is still there, this must be investigated
and understood to rule out any electronics problem.