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User name jpchen
Log entry time 15:56:17 on March22,2000
Entry number 36710
keyword=Shift summary
Shift summary:
Shift crew: J. P. Chen, G. Quemener, G. Chang.
Continue data taking at kinematics 12:
Last shift: Runs 2877, 2878, started 2879.
This shift:
2879: ......1.5/3/16.....................981/2738.................2.17/6.01.......good run
2880: very short run.
~10 am Asked for OTR in and lower beam current (to about 40 uA) to check
the beam energy spread and to correct the difference seen in 1C12_x positions
and 3C12_x between Hall C and Hall A (was consistent then a jump at about 4 am).
MCC had to re-tuning beam after losting orbit lock when lowering beam.
After beam back, MCC tuned to reduce the the difference.
Then we checked the OTR to be <200 um.
Did a harp scan with raster off beam width sigma=108um and 126.551 (Run 700).
Then harp scan with raster on (run 710).
It was found that with MCC 1.79x3.16, we only got about 4x2.5 mm.
Increased MCC y value to 5, raster is about 4X3.5 mm.
Runs 2881-2887 are all special none-data taking runs.
11:40 Asked to have high current for data taking. SOme problem to get high beam current.
12:40 Got 120 uA, but energy (1c12_x was not good) (about -.5).
Start Run 2888 failed (due to ER1 not responding), rebooted coda, it's ok now.
Run 2889 beam energy adjusting during the run.
..2890.........1.48/4.64................980(estimate)/3718....2.5/8.51.....no endrun (ROC14)
..2891........0.20/4.84.................133/3851..................0.35/8.86......good run
15:45 MCC needed beam to do OTR.