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40m Log |
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Tue Apr 19 18:10:10 2022, Paco, Update, BHD, Part V of BHR upgrade - POX11 path, LO path, and ITMX Oplev  
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Wed Apr 20 08:20:22 2022, Paco, Update, BHD, Part V of BHR upgrade - PR2 weirdness
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Wed Apr 20 18:50:03 2022, Koji, Update, BHD, Part V of BHR upgrade - PR2 weirdness
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Thu Apr 21 16:49:01 2022, Paco, Update, BHD, Part V of BHR upgrade - BS Oplev + LO1 offset
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Thu Apr 21 18:42:47 2022, Tega, Update, BHD, Part V of BHR upgrade - Align LO and AS beams to BHD BS
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Thu Apr 21 20:33:31 2022, Koji, Update, BHD, AS1 UR OSEM problem localized in the chamber
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Fri Apr 22 12:03:09 2022, Tega, Update, BHD, AS1 UR OSEM problem localized in the chamber
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Fri Apr 22 12:15:08 2022, Anchal, Update, BHD, Cable post installation
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Mon Apr 25 16:57:57 2022, Anchal, Update, BHD, Cable post installation
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Message ID: 16800
Entry time: Thu Apr 21 18:42:47 2022
In reply to: 16797
Reply to this: 16801
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Author: |
Tega |
Type: |
Update |
Category: |
BHD |
Subject: |
Part V of BHR upgrade - Align LO and AS beams to BHD BS |
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[Tega, Yuta, Paco]
We tried aligning the LO and AS beams on to the BHD beamsplitter. During the alignment process, we noticed that the damping loop for AS1 was not working. Paco drew our attention to the fact that the UR OSEM signal was alway close to zero, so we checked to ensure that the magnet was still within the OSEM recess and it looks OK. Next we checked the electrical connection at the interface between the copper OSEM cables to the blue in-vacuum flat cable and this too looks alright also. Since the AS1 coil driver was recently modified, it is possible we might find the problem there, so I'll ask Koji about this.
So Koji clarified that the coil driver board and SATAMP boards are different so we should connect this issue to the coil driver board. |