[Bteam] reliability of bunchlength measurement suspect?

[Matt Poelker]

How is it possible to run CEBAF when 1/4 cryomodule cavity 7 is *wrong* 
by 12 degrees!!!  Or how about on October 9 when cavity 7 was wrong by 
37 degrees?  Attached spread sheet shows tweak-summary of chopper gang, 
buncher, capture, quarter cavity 7, quarter cavity 8 following each 
bunchlength measurement since August 9.  Big offenders - quarter 
phases.  Some days, relatively big changes to capture.  It used to be we 
never expected to move things by more than a degree or so, right?  I 
remember adjusting phases in increments < 1 degree to get nice yao 
cavity pattern.  Helpful?  Tell me and I'll butt out. 
Matt







-- 
Matt Poelker
Jefferson Lab
MS Bldg 5A, Rm 500-17 
12000 Jefferson Ave., 
Newport News, VA 23606
poelker at jlab.org
757-269-7357 office
757-584-7357 pager

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