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| 40m Log |
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 Tue Jul 19 18:41:42 2022, yuta, Update, BHD, Contrast measurements for Michelson and ITM-LO 
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 Wed Jul 20 18:07:52 2022, Paco, Update, BHD, BHD MICH test
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Tue Jul 26 20:54:08 2022, Paco, Update, BHD, BHD MICH test - LO phase control
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Wed Jul 27 18:30:50 2022, yuta, Update, BHD, LO beam power at BHD DCPDs is significantly lower than expected
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Thu Jul 28 14:34:40 2022, Yehonathan, Update, BHD, LO beam power at BHD DCPDs is significantly lower than expected
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Thu Jul 28 16:51:55 2022, Tega, Update, BHD, Shaking test for LO beam AS beam to BHD DCPDs
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Thu Jul 28 20:16:26 2022, Anchal, Update, BHD, Shaking test for LO beam AS beam to BHD DCPDs
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Fri Jul 29 18:24:53 2022, Tega, Update, BHD, LO beam power improved by factor of 6 after LO and AS beam alignment
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Wed Aug 3 16:00:51 2022, yuta, Update, BHD, BHD fringe aligned with reduced LO and AS beam clipping
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Tue Aug 9 15:33:12 2022, yuta, Update, BHD, BHD fringe contrast improved from 43% to 74%
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Tue Aug 9 15:50:22 2022, Koji, Update, BHD, BHD fringe contrast improved from 43% to 74%
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Wed Nov 16 15:09:08 2022, yuta, Update, BHD, BHD fringe contrast measured with unwhitening filters
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Tue Oct 25 08:25:00 2022, JC, Update, BHD, BHD fringe aligned with reduced LO and AS beam clipping
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Thu Nov 17 11:24:39 2022, JC, HowTo, LSC, Locking MICH
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Tue Nov 29 11:38:37 2022, JC, HowTo, LSC, Lock Single Arm After MICH lock
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Message ID: 17067
Entry time: Tue Aug 9 15:33:12 2022
In reply to: 17056
Reply to this: 17068
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| Author: |
yuta |
| Type: |
Update |
| Category: |
BHD |
| Subject: |
BHD fringe contrast improved from 43% to 74% |
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[Anchal, Yehonathan, Yuta]
We did the constrast measurement with the method same as 40m/17020.
Contrast between ITM single bounce and LO beam increased to 74% (we had 43% before unclipping LO beam in 40m/17056).
From equations in 40m/17041 and measured ITM sigle bounce power (93 or 138 counts @ BHD DCPD) and LO power (130 or 124 counts @ BHD DCPD) from 40m/17056, expected visibility for perfectly mode-matched case is 99%.
Measured constrast of 74% indicate mode-matching of 56%.
Both arms locked, MICH fringe (20% percentile)
Contrast measured by C1:LSC-ASDC_OUT is 80.66 +/- 0.20 %
Contrast measured by C1:LSC-POPDC_OUT is 92.27 +/- 0.66 %
Contrast measured by C1:LSC-REFLDC_OUT is 89.59 +/- 0.84 %
Contrast measured by all is 87.51 +/- 1.69 %
Both arms misaligned, MICH fringe (20% percentile)
Contrast measured by C1:LSC-ASDC_OUT is 82.50 +/- 0.61 %
Contrast measured by C1:LSC-POPDC_OUT is 94.18 +/- 0.26 %
Contrast measured by C1:LSC-REFLDC_OUT is 92.78 +/- 0.19 %
Contrast measured by all is 89.82 +/- 1.75 %
ITMX-LO fringe (40% percentile)
Contrast measured by C1:HPC-DCPD_A_OUT is 73.93 +/- 1.52 %
Contrast measured by C1:HPC-DCPD_B_OUT is 73.56 +/- 1.22 %
Contrast measured by all is 73.74 +/- 0.98 %
ITMY-LO fringe (40% percentile)
Contrast measured by C1:HPC-DCPD_A_OUT is 73.45 +/- 0.61 %
Contrast measured by C1:HPC-DCPD_B_OUT is 75.27 +/- 0.50 %
Contrast measured by all is 74.36 +/- 0.54 % |
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