ligo-ex ligo-ds
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Message ID: 179     Entry time: Fri Jul 28 13:46:17 2023
Author: Aiden 
Type: Update 
Category: VAC 
Subject: Vacuum Chamber Baking Update 

Took some more data to look at the HC count. Initial data was from leaving the Argon leak closed and then left it open for 15 minutes and then took data for the open scenario. Attached are the graphs for these where attachment 1 is the closed scenario and attachment 2 is the open scenario.

From these graphs it looks like the signal-noise ratio of our calibration line is poor with the ratio between these two being 1.3. This means that the calibrated leak is barely being detected over the background. This should improve with more baking and pumping. I have also now attached overlayed graphs comparing the chamber when the leak is closed versus when it is open. As well as one comparing the chamber right after the bake versus the most recent data both with the leak open.

Attachment 1: bake2_230720_ArC.png  350 kB  | Show | Hide all | Show all
Attachment 2: bake2_230720_ArO.png  335 kB  | Hide | Hide all | Show all
bake2_230720_ArO.png
Attachment 3: bake2_230728_Closed_Open.png  546 kB  Uploaded Mon Jul 31 14:14:49 2023  | Show | Hide all | Show all
Attachment 4: bake2_230728_Open_Open.png  546 kB  Uploaded Mon Jul 31 14:14:58 2023  | Hide | Hide all | Show all
bake2_230728_Open_Open.png
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