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Entry  Wed May 22 17:48:49 2019, anchal, DailyProgress, TempCtrl, Vacuum Can Temp Sensors restarted with new board Temp-Sensor-Box.jpegBreakoutBox.jpeg
    Reply  Wed Dec 4 17:09:44 2019, anchal, DailyProgress, TempCtrl, Increased range of out-of-loop temperature sensor 
Message ID: 2349     Entry time: Wed May 22 17:48:49 2019     Reply to this: 2486
Author: anchal 
Type: DailyProgress 
Category: TempCtrl 
Subject: Vacuum Can Temp Sensors restarted with new board 

I installed the new board LIGO-D1800304 with an external voltage regulator and breakout box for handling acromag channels. See attached photos. The transimpedance amplifiers required a parallel capacitor in the feedback path for avoiding oscillations. Since these are temperature sensors and we do not care much about high-frequency noise, I added 1 nF capacitors at the COMIT3,9 and 11 positions. This should give us a bandwidth of 10 kHz. The channels are as follow:

CH No on Board EPICS Channel Name Temperature Conversion Function (ºC) Range (ºC)
1 C3:PSL-TEMP_TABLE = V/0.810875 + 27.30248869 13.860-40.745
2 C3:PSL-TEMP_VACCAN_INLOOP = V/1.625 + 33.3115385 26.604-40.020
3 C3:PSL-TEMP_VACCAN_OOL = V/1.625 + 33.3115385 26.604-40.020

Vacuum Can Temperature Control

With the new sensors, I have set relay autotune test to happen overnight with relay amplitude of 0.75V and 0.75 offset for 16 hrs. This should tell us optimal PID parameters. Hopefully, these measures will make the can temperature stable enough which I'll try to set around 33 degrees (my guess setpoint to keep good enough cooling rate). Then with Andrew's new script, the cavity temperature control was pretty good and hopefully we'll lower the overall drift of beatnote.

Attachment 1: Temp-Sensor-Box.jpeg  1.472 MB  Uploaded Wed May 22 19:00:49 2019  | Hide | Hide all
Attachment 2: BreakoutBox.jpeg  1.098 MB  Uploaded Wed May 22 19:02:01 2019  | Hide | Hide all
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