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Entry  Thu Apr 1 20:54:57 2021, Radhika, DailyProgress, 2um Photodiodes, Opened cryo chamber and removed old PD 7x
    Reply  Fri Apr 9 16:23:22 2021, rana, DailyProgress, 2um Photodiodes, Opened cryo chamber and removed old PD 
    Reply  Tue Apr 13 11:48:04 2021, Radhika, DailyProgress, 2um Photodiodes, Opened cryo chamber and removed old PD 
Message ID: 2554     Entry time: Tue Apr 13 11:48:04 2021     In reply to: 2550
Author: Radhika 
Type: DailyProgress 
Category: 2um Photodiodes 
Subject: Opened cryo chamber and removed old PD 

I posted a video tutorial of the diode replacement.

https://dcc.ligo.org/G2100807

Quote:

04/01/21

Aidan and I removed the old PD from the cryo chamber in order to start testing C3 (plan for tomorrow, 04/02).

Steps:

- Brought chamber up to room pressure, disconnected readout wires and vacuum pump.

- Picked up chamber and placed it upside down on makeshift support stand (see pics).

- Unscrewed mounting plate and 2 inner insulation plates to reveal mounted PD.

- Had trouble unscrewing PD mount, since the screws were very close to the PD and we had to be careful not to slip and cause damage. Started with 2 side screws, then bottom (hardest), then top.

- Successfully removed PD and put away. Placed chamber components back in place without bolting in.

- Plan is to mount PD C3 in chamber tomorrow and begin testing.

 

 

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