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| 40m Log |
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 Sun Apr 29 22:53:06 2018, gautam, Update, General, DARM actuation estimate 
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 Tue May 1 19:37:50 2018, gautam, Update, General, DARM actuation estimate
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Mon May 7 16:23:06 2018, gautam, Update, General, DARM actuation estimate
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Mon May 7 20:01:14 2018, Rorpheus, Update, General, Use anti-dewhitening + show CARMA/DARMA
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Thu May 10 14:13:22 2018, gautam, Update, General, More refinement of DARM control signal projection
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Fri May 11 13:58:42 2018, rana, Update, General, More refinement of DARM control signal projection
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Fri May 11 19:02:52 2018, gautam, Update, General, More refinement of DARM control signal projection
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Sat May 12 10:02:03 2018, rana, Update, General, More refinement of DARM control signal projection
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Sun May 20 17:43:01 2018, rana, Update, Electronics, How to choose resistors
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Mon May 14 18:58:32 2018, Kevin, Update, PonderSqueeze, Squeezing with no SRM
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Tue Oct 2 23:57:16 2018, gautam, Update, PonderSqueeze, Squeezing scenarios
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Tue May 15 21:56:57 2018, gautam, Update, General, Stack measurement setup decommissioned
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Thu May 17 09:14:38 2018, Steve, Update, General, Stack measurement setup decommissioned
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Message ID: 13841
Entry time: Mon May 14 18:58:32 2018
In reply to: 13835
Reply to this: 14225
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| Author: |
Kevin |
| Type: |
Update |
| Category: |
PonderSqueeze |
| Subject: |
Squeezing with no SRM |
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| Quote: |
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Note that for Signal Recycling, which is what Kevin tells us we need to do, there is a DARM pole at ~150 Hz.
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To be quantitative, since we are looking at smaller squeezing levels and considering the possibility of using 5 W input power, it is possible to see a small amount of squeezing below vacuum with no SRM.
Attachment 1 shows the amount of squeezing below vacuum obtainable as a function of homodyne angle with no SRM and 5 W incident on the back of PRM. The optimum homodyne angle at 210 Hz is 89.2 deg which gives -0.38 dBvac of squeezing. Figure 2 is the displacement noise at this optimal homodyne angle and attachment 3 is the same noise budget shown as the ratio of the various noise sources to the unsqueezed vacuum.
The other parameters used for these calculations are:
- 4.5 kΩ series resistance for the ETM coils; 15 kΩ for the ITM coils
- 100 ppm transmissivity on the folding mirrors giving a PRC gain of 40
- PD quantum efficiency of 0.88
So maybe it's worth considering going for less squeezing with no SRM if that makes it technically more feasible. |
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