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User name A. Camsonne
Log entry time 21:20:56 on May 15, 2009
Entry number 273730
keyword=Cannot lock Compton laser cavity
I tried to improve the alignement of the cavity to see if I could get the
cavity more stable. I could not go over 600 W and eventually lost the
lock and did not managed to get it back since.
Rebooting the IOC did not help. My usual trick to play with the servo
threshold seems to be less successful with the new laser.
The Yokogawa setting is right now on channel 1 360 mV and phase of -176
degrees. Sirisj mentioned a number for the phase of -279 degrees, not
sure if that was the right one, I gave it a try but did not see much
difference so I restored it to -176 degrees. Channel two is a 2V and phase 0.
I recorded the previous values of the mirror positions :
Mirror 1
H -310
V -330
Mirror 2
H -2080
V 1470
I noticed that motion of mirror 2 in vertical is much slower than the
other one, so I am wondering if it has issues or is sliding.
I never paid attention to that before but maybe cavity experts can confirm.
A copy of this log entry has been emailed to: nanda@jlab.org,rahkman@jlab.org