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40m Log |
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Tue May 3 21:05:23 2022, yuta, Update, BHD, AS path alignment, removing a lot of green stuff 7x
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Wed May 4 13:09:42 2022, Anchal, Update, BHD, IMC table balanced again, IMC is locking, YARM is locking
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Wed May 4 15:08:59 2022, Tega, Update, BHD, XARM alignment to get flashing
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Wed May 4 18:52:43 2022, Tega, Update, BHD, POP beam too high at POP SM4 on the ITMX chamber
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Thu May 5 14:46:22 2022, Anchal, Update, BHD, POP beam height lowered, POP_SM4 raised
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Thu May 5 17:05:31 2022, Tega, Update, BHD, IMC & X/Y-arm alignment
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Mon May 9 18:43:03 2022, Anchal, Update, BHD, ITMX table layout corrected
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Mon May 9 18:49:05 2022, Tega, Update, BHD, Relocate green TRX and TRY PDs/cams/optics from PSL table to BS table 
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Tue May 10 15:46:38 2022, JC, Update, BHD, Relocate green TRX and TRY components from PSL table to BS table 
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Tue May 10 18:25:43 2022, Paco, Update, BHD, Green Transmission path
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Tue May 10 16:31:14 2022, Tega, Update, BHD, ITMX optlev return beam steered to QPD
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Fri May 6 13:48:34 2022, Anchal, Update, BHD, WFS loop instability fixed
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Thu May 12 19:55:01 2022, Tega, Update, BHD, AS path alignment 
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Thu May 12 20:11:18 2022, Anchal, Update, BHD, BHDBS Output beams steered out to ITMY table
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Thu May 12 20:24:29 2022, yuta, Update, BHD, POX and POY investigation
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Mon May 16 13:22:59 2022, yuta, Update, BHD, REFL and AS paths aligned at AP table 
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Mon May 16 19:14:17 2022, Anchal, Update, BHD, Camera set on AS path and BHDBS output path
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Tue May 17 18:43:38 2022, Anchal, Update, BHD, Placed SRM in ITMY Chamber
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Wed May 18 08:30:29 2022, Paco, Update, BHD, SRM OpLev
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Thu May 19 08:51:40 2022, Paco, Update, BHD, SRM OpLev
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Wed May 18 09:02:52 2022, Anchal, Update, BHD, WFS1 PD centered
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Wed May 18 17:23:15 2022, Anchal, Update, BHD, Placed PRM in BS Chamber
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Thu May 19 18:56:08 2022, yuta, Update, BHD, Current OSEM sensor values with all the suspensions aligned
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Thu May 19 19:05:59 2022, Anchal, Update, BHD, BS Chamber all work finished, BHD path setup
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Fri May 20 20:03:48 2022, Paco, Update, BHD, ITMY chamber work finished - LO and AS overlapped 
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Mon May 23 13:16:59 2022, Paco, Update, BHD, End of vent - checks  
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Tue May 24 15:21:13 2022, Anchal, Update, BHD, Freeswing tests of new SOS started
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Message ID: 16863
Entry time: Wed May 18 17:23:15 2022
In reply to: 16860
Reply to this: 16865
16866
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Author: |
Anchal |
Type: |
Update |
Category: |
BHD |
Subject: |
Placed PRM in BS Chamber |
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[Anchal, Paco, Yuta, JC]
SRM Oplev setup
- We setup SRM oplev path for the aligned position of SRM.
- This was bit hard, because the return beam was following almost the same path as the input beam, and the return beam had become about 1 cm in diameter.
- We replaced one of the in-air steering mirror of SRM op-lev input beam with a 1 inch BS on a non-steeerable mount.
- The returning oplev beam is picked at transmission from this BS.
- Note: we are not sure if this BS is actually coated for IR or Visible. We couldn't find a visible BS in the lab. We should order a 2 in diameter visible BS to be placed in this position.
- Half of the input beam would be used for PRM Oplev input.
- The returning beam was focused with a 100mm focal length lens. Again, this lens is not verified to be for visible wavelength. We think it might have an AR coating for IR. We should get a visible lens for this position also.
PRM Placement
- PRM placed in nominal position + 2 cm, East.
- Currently, PRM SOS tower is blocking BS oplev input beam, this needs to be adjusted.
- Installed PRMOL at nominal position + 2 cm East (to clear path from TT2)
- I balanced the table succesfully, first using spirit bubble level and then OSEM levels of BS, SR2, PR3 and LO2.
- Note, that we need to adjust OSEM positions in many of these SOS before pumping down.
- Input beam from TT2 is going through center of PRM but the reflction is not coming back from PR2, maybe it is missing PR2 or PR2 alignment needs to be adjusted.
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