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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: 16868
Entry time: Fri May 20 20:03:48 2022
In reply to: 16866
Reply to this: 16869
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Author: |
Paco |
Type: |
Update |
Category: |
BHD |
Subject: |
ITMY chamber work finished - LO and AS overlapped |
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[Paco, Anchal, Yuta]
Today, in short we:
- Recovered alignment of arm cavities, PRC (only ITMX aligned), and then altogether with SRM and PRM aligned to maximize all DCPD levels (AS, POP, REFL, TRX, TRY), but SRC was not flashing and the SRM yaw alignment slider was around its max value, so after recording beam positions on cameras Anchal went into the BS chamber and helped steer the SRC alignment using a combination of SRM, SR2 and AS1. After this every beam was nominally aligned except for LO and AS, which remained to be mode matched.
- Mode matched LO3-LO4 by hand --
-- from the ITMY chamber, the final separation between these two mirrors grew by almost 3 inches with respect to the design (!!!) but the LO and AS beams came out nicely. The canonical path used for the steering was LO path, and then we overlapped the beams with the help of a gige basler camera and a couple of DCPDs (Thorlabs).
- Yuta and Paco started running final checks in preparation for Monday (pumpdown). We aligned the IFO, but noted that using Restore/Misalign sometimes results in hysteresis.. so it is not very reliable for fine alignment modes. Then we optimized DC levels, centered all oplevs, and tweaked Green input alignment on XARM and YARM. The XARM was maximized, but in YARM we could still not get high TEM-00 flashing ...
- Unfortunately, we discovered a slight clipping of the GTRY beam through PR3 which could mean the current alignment (pointing) is not hitting PR3 center optimally.
- Attached are the screenshot of current aligned state after the work tonight, with oplevs centered, and the OSEM sensor values.
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2022-05-20 20:39:15.780409
=====BS=====
C1:SUS-BS_ULSEN_OUT16 = 599
C1:SUS-BS_LLSEN_OUT16 = 575
C1:SUS-BS_URSEN_OUT16 = 602
C1:SUS-BS_LRSEN_OUT16 = 636
C1:SUS-BS_SDSEN_OUT16 = 669
=====ITMX=====
C1:SUS-ITMX_ULSEN_OUT16 = 403
C1:SUS-ITMX_LLSEN_OUT16 = 609
... 76 more lines ...
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