[Xrayops] Elevated 30hz beam motion

APS Experiment Hall X-ray Operations Problem List xrayops at mailman.aps.anl.gov
Sat Jul 24 15:36:43 CDT 2010

On Saturday, 24 July 2010, there were multiple instances of elevated 
coupling, beam motion spikes and elevated beam motion due to errors from 
corrector compensation for the CPU while operating in different modes.

 From ~10:31 to ~12:55 - SR coupling was elevated at 2.6%
At 12:59 - there was a spike in 30hz rms beam motion. 6.2 microns x and 
.82 microns y. After the spike motion was elevated at 2.2 microns X and 
.55 microns Y until 13:12.

 From 13:21-13:32 there was a spike of 3.3 microns X and 0.6 microns Y

 From 13:44-13:46 there was a spike of 3.0 microns X and 0.57 microns Y

 From 14:07-14:58 - There was sustained elevated beam motion of 2.2 
microns X and 0.55 microns Y.

At 15:12 there was a spike of 1.8 microns X and 0.57 microns Y

At 15:14 there was a spike of 0.77 microns Y

Throughout this time we were in contact with equipment experts 
diagnosing the problem. We were able to reset the correctors and now the 
CPU is running without any impact on beam motion.


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