Very Crude BCM Calibration

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User name V. Sulkosky

Log entry time 22:33:05 on February 16, 2011

Entry number 347251

keyword=Very Crude BCM Calibration

I have done an extremely rough BCM calibration for the end of run file. I strongly suggest we do a real BCM calibration soon. I tried to use old coefficients from before 2006, but the best I could find was from 2002 and those did not work very well. Since Hall C is not running, I based the coefficients on the 0L02 beam current. Hopefully they are good to the 10% level.

AVERAGE CURRENT
BCM x1 : 6.2953 uA  BCM x3 : 6.3080 uA  BCM x10: 6.3024 uA  

 Test of Helicity gates
Time diff of helicity to nonhelicity times  =       -15.65157 seconds

APPROXIMATE CURRENT ASYMMETRIES
BCM u1 : -340.3 ppm     BCM u3 :   -131.7 ppm  BCM u10: -10.23 ppm     
BCM d1 : -337.8 ppm     BCM d3 :   -38.84 ppm  BCM d10:   0.5316 ppm     

APPROXIMATE BCM CHARGES (C)
BCM u1 [0] : 0.009978  BCM u3 [0] : 0.009993      BCM u10[0] : 0.009975 
     
BCM u1 [+] : 0.004709  BCM u3 [+] : 0.004715      BCM u10[+] : 0.004708 
     
BCM u1 [-] : 0.004712  BCM u3 [-] : 0.004717    BCM u10[-] : 0.004708       

BCM d1 [0] : 0.00995        BCM d3 [0] : 0.009975       BCM d10[0] :
0.009975       
BCM d1 [+] : 0.004694       BCM d3 [+] : 0.004708       BCM d10[+] :
0.004708       
BCM d1 [-] : 0.004698       BCM d3 [-] : 0.004708       BCM d10[-] :
0.004708

A copy of this log entry has been emailed to: doug,kelleher