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 Thu Feb 13 21:30:55 2020, shruti, Update, ALS, ALS OOL noise with arms locked 
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 Fri Feb 14 14:02:13 2020, shruti, Update, ALS, ALS OOL noise with arms locked
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Fri Feb 14 14:52:41 2020, gautam, Update, ALS, ALS OOL noise with arms locked
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Tue Feb 18 18:14:59 2020, shruti, Update, ALS, ALS OOL noise with arms locked
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Wed Feb 19 22:20:22 2020, rana, Update, ALS, ALS OOL noise with arms locked
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Fri Feb 21 10:59:08 2020, shruti, Update, ALS, PDH error signals?
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Fri Feb 21 13:02:53 2020, Koji, Update, ALS, PDH error signals?
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Fri Feb 21 20:44:18 2020, shruti, Update, ALS, ALS OOL noise and PDH
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Sun Feb 23 18:15:22 2020, rana, Update, ALS, ALS OOL noise and PDH
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Message ID: 15216
Entry time: Tue Feb 18 18:14:59 2020
In reply to: 15214
Reply to this: 15217
15218
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| Author: |
shruti |
| Type: |
Update |
| Category: |
ALS |
| Subject: |
ALS OOL noise with arms locked |
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We proceeded with the trying to measure the ALS out-of-loop noise of the X arm when the X arm cavity is green-locked using different PDH sideband frequencies.
Before doing the experiment, Koji helped us with getting the arm cavities locked in IR using LSC (length) and ASC (angular).
With the arms locked in IR and green, we repeated the same measurements as before at different sideband frequencies (Refer Attachment 1 - label in Hz). We did not optimize the phase nor did we look at the PDH error signal today which is possibvly why we did not see an improvement in the noise. We will look into this possibly tomorrow. |
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