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Entry  Wed Nov 25 23:17:34 2015, yutaro, Update, LSC, strange behavior of ASDC 14.png
    Reply  Mon Nov 30 16:33:06 2015, ericq, Update, LSC, strange behavior of ASDC AScentering.png
       Reply  Mon Nov 30 18:27:30 2015, Koji, Update, LSC, strange behavior of ASDC 
    Reply  Thu Dec 10 12:33:04 2015, yutaro, Update, LSC, strange behavior of ASDC 07.png28.pngASDC.png
       Reply  Thu Dec 10 19:53:22 2015, yutaro, Update, LSC, strange behavior of ASDC 30.png11.png49.png
Message ID: 11870     Entry time: Thu Dec 10 12:33:04 2015     In reply to: 11815     Reply to this: 11871
Author: yutaro 
Type: Update 
Category: LSC 
Subject: strange behavior of ASDC 

I did additional tests for the strange behavior of ASCD. ETMY, ETMX and ITMY were misaligned so that only light reflected by ITMX went into AS port. I had done similar measurement before with ITMY YAW varied.

Attachment 1 shows how ASDC level changed when ITMX PIT varied.

Attachment 2 shows how ASDC level changed when ITMX YAW varied.

Attachment 3 shows how the power of light measured by a power meter just after the AS view port varied when ITMX YAW varied.

 

Comparing 1 & 2, we can say that this behavior is not unique to YAW direction.

From 2 & 3, we can say something strange is happening inside the chamber.   

 

Attachment 1: 07.png  10 kB  | Hide | Hide all
07.png
Attachment 2: 28.png  22 kB  | Hide | Hide all
28.png
Attachment 3: ASDC.png  30 kB  | Hide | Hide all
ASDC.png
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