Diary

20150820_23xxxx	PockelsCell145 installed in BlueChannel replacing PockelsCell144
20150821_150055	PCT measurement
20150821_163526	PCD off
20150821_174238	Low flux regime, loops on. Snapshot
20150821_174600	Chiller halted. Automatic poweroff
20150821_18xxxx	Test of MoCon ethernet port
20150821_184600	Rack powercycle. Power up
20150821_192318	Red pupil ear. Snapshot
20150821_192429	PCD on
20150821_192547	PCT measurement
20150821_195819	Pupil stabilization loop test
20150821_215603	PCD off
20150821_224723	PCD on
20150821_224924	Pupil stabilization loop test
20150822_021200	Device Error Pupil Motor Red
20150822_022500	Patrol Camera disconnected and re-plugged after about 30min. After that device error on MoCon: SW restarted
20150822_170222	PCT measurement - Red Pupil Ear disappeared
20150822_202506	PCT measurement. Ok
20150822_202800	shutdown-restart-powerup
20150822_205600	SW restart
20150823_165520	PCT measurement. Ok
20150823_170000	Poweroff. We need the electronics for dx-lgsw

Zabbix

Zabbix patched to allow for 5min zoom in graphs. Downloaded a patch called zabbix-2.0.7-zoom.path from the web and installed on both WorkStation1 and WorkStation2

Pupil stabilization loop stability with flux variations

Between 20150821_195819 and 224924 we run with pupil and jitter loop closed and different values of flux to see if the algorithms have a dependence on the flux. The short answer is no.

The flux is adjusted, we wait for the loops to converge and we store pupil motor position and piezo mirror offset. We repeat for several flux levels. We never saw an abrupt change of pupil motor position or piezo mirror offset after the flux was adjusted, and this is considered an argument to assert that the pupil stabilization algorithm is robust to flux variations.

We could instead notice a slow drift with 1h timescale. The PtV drift over a 2h range are the following:

Ch (x,y)	Pupil Motor (steps)	Piezo (mrad)
Blue	5, 7	0.2, 0.2
Yellow	11, 12	0.5, 0.3
Red	18, 17	0.5, 0.7

Pockels cells

System has been long all night long without flaws.

Pockels cells are still ok: they have been on continuosly from 20150821_000519 to 20150821_163526 and no issues in the PCT have been seen. We tested both normal humidity (30%) and low humidity regimes.

At 20150821_163526 we powered off the pockel cell driver to check the pupil stabilization routine in low flux regime

At 192000 after a complete power-cycle of the system the red pupil has "ears"

The system is left on continously most of the time with PCD on and dry air. At 20150822_170222 the "ears" are disappeared and don't reappear until the end of the test on 20150823_170000

• 20150820_190914. PockelsCell144, PockelsCell141, PockelsCell147
  

• 20150821_150055 PockelsCell145, PockelsCell141, PockelsCell147
  

• 20150821_192547 PockelsCell145, PockelsCell141, PockelsCell147
  

• 20150823_165520 PockelsCell145, PockelsCell141, PockelsCell147: