Log entry time 19:06:52 on January 8,2003

Entry number 91054

This entry is a followup to: 91025

Beam is back, so we are continuing the IA re-calibration procedure.



17:42  We have coordinated with Hall C, and are starting our baseline



Run   IA    S2    S1  Aq(bcm1)  Aq(bcm2)   Starttime

1121  5       0      0      526            545             17:42

1122  9       0      0      929            971             17:49

1123  9   -1000   0    1096          1138            18:07    

1124  9   -2000   0    1032          1073            18:19   

 	.... charge asymmetry RMS went up, for no good reason.

1125  9   -2000   0    1006          1050            18:27   

	... charge asymmetry RMS went back down..

1126  9   -3000   0      799            829            18:34

1127  9   -1500   0    1032          1073            18:43

1128  9          0    0    1077          1122            18:48

1129  5          0    0     535            554            18:51

1130  1          0    0      -30            -36            

1131  5          0    0     511            532



Ok, so things aren't as easy as I thought.  The effect rolls over, and we can't get

much more than 120 ppm/Volt.  Also, there is a lot of backlash, so much that

the amount of backlash approximately equals the effective moment arm.  Hmmm..

this will take some more thinking.



We are losing beam (target stuff) so we are packing it in now. I'll tell MCC to keep the instructions around, in case someone on owl gets ambitious.  We can use our 

new IA slope to try feedback, as long as the "natural" Aq isn't too large.   I expect that with so little breathing room around the systematic offset, we will be likely to rail...