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40m
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| 40m Log |
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 Mon May 2 17:11:55 2016, rana, Update, COC, RC folding mirrors
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 Wed May 18 01:10:22 2016, gautam, Update, COC, Finesse modelling 
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Tue May 24 22:49:02 2016, gautam, Update, COC, Finesse modelling - mode overlap scans 9x
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Tue May 24 23:17:37 2016, ericq, Update, COC, Finesse modelling - mode overlap scans
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Thu Jun 16 15:57:46 2016, gautam, Update, COC, Contrast as a function of RoC of ETMX
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Thu Jun 16 18:42:12 2016, rana, Update, COC, Contrast as a function of RoC of ETMX
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Thu Jun 16 23:02:57 2016, gautam, Update, COC, Contrast as a function of RoC of ETMX
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Mon Jun 20 01:38:04 2016, rana, Update, COC, Contrast as a function of RoC of ETMX
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Mon Jun 20 18:07:15 2016, gautam, Update, COC, Contrast as a function of RoC of ETMX
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Tue Jun 28 16:06:09 2016, gautam, Update, COC, RC folding mirrors - further checks
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Thu Jun 30 16:21:32 2016, gautam, Update, COC, Sideband HOMs resonating in arms
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Sat Aug 13 18:25:22 2016, gautam, Update, COC, RC folding mirrors - Numerical review
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Tue Aug 16 11:51:43 2016, gautam, Update, COC, RC folding mirrors - Numerical review
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Tue Aug 16 16:38:00 2016, gautam, Update, COC, RC folding mirrors - Numerical review
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Wed Aug 17 14:37:36 2016, gautam, Update, COC, RC folding mirrors - Numerical review
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Wed Aug 17 16:28:46 2016, Koji, Update, COC, RC folding mirrors - Numerical review
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Mon Nov 21 15:34:24 2016, gautam, Update, COC, RC folding mirrors - updated specs
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Thu Feb 23 10:59:53 2017, gautam, Update, COC, RC folding mirrors - coating optimization
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Tue Mar 14 10:56:33 2017, gautam, Update, COC, RC folding mirrors - coating optimization
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Mon Apr 10 15:37:11 2017, gautam, Update, COC, RC folding mirrors - v3 of specs uploaded 8x
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Message ID: 12194
Entry time: Thu Jun 16 23:02:57 2016
In reply to: 12193
Reply to this: 12197
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| Author: |
gautam |
| Type: |
Update |
| Category: |
COC |
| Subject: |
Contrast as a function of RoC of ETMX |
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| Quote: |
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That sounds weird.  If the ETMY RoC is 60 m, why would you use 57.6 m in the simulation? According to the phase map web page, it really is 60.2 m.
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This was an oversight on my part. I've updated the .kat file to have all the optics have the RoC as per the phase map page. I then re-did the tracing of the Y arm cavity mode to determine the appropriate beam parameters at the laser in the simulation, and repeated the sweep of RoC of ETMX while holding RoC of ETMY fixed at 60.2m. The revised contrast defect plot is attached (this time it is the contrast defect, and not the contrast, but since I was running the simulation again I thought I may as well change the plot).
As per this plot, if the ETMX RoC is ~54.8m (the closer of the two spares to 60.2m), the contrast defect is 0.9%, again in good agreement with what the note linked in the previous elog tells us to expect... |
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