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Entry  Mon Jul 11 11:56:40 2022, he Yehonathan, Update, BHD, MICH AS55 noise budget Control_Diagram.pdfMICH_AS55_Noise_Budget.pdf
    Reply  Tue Jul 12 09:14:50 2022, rana, Update, BHD, MICH AS55 noise budget 
       Reply  Wed Jul 13 10:54:39 2022, Yehonathan, Update, BHD, MICH AS55 noise budget BS_MICH_ACtuation_Calibration.pdfMICH_AS55_Model_Measurement_Comparison.pdfMICH_AS55_Noise_Budget.pdf
          Reply  Wed Jul 13 13:30:48 2022, Yehonathan, Update, BHD, add Laser RIN to MICH budget 
             Reply  Mon Jul 18 16:49:57 2022, Yehonathan, Update, BHD, add Laser RIN to MICH budget Laser_RIN.pdfMICH_AS55_Noise_Budget.pdf
                Reply  Mon Jul 18 18:33:38 2022, Koji, Update, BHD, add Laser RIN to MICH budget 
Message ID: 16996     Entry time: Wed Jul 13 10:54:39 2022     In reply to: 16989     Reply to this: 16999
Author: Yehonathan 
Type: Update 
Category: BHD 
Subject: MICH AS55 noise budget 

I fixed some mistakes in the budget:

1. The BS pendulum resonance was corrected from 0.8Hz to 1Hz

2. Added missing X3 filter in the coil filters

3. Optical gain is now computed from MICH to AS55 instead of BS to AS55 and is calculated to be: 9.95e8 cts/m.

4. Coil driver gain is still unmeasured but it is found to be 1.333 to make the actuation calibration from BS to MICH match the measurement (see attachment 1).

Attachment 2 shows the resulting MICH OLTF.

Laser noise was added to the budget in a slightly ad-hoc fashion (will fix later): Yuta and I measured MC_F and computed MC_F*(Schnupp asymmetry)/(Laser frequency). Attachment 3 shows the updated noise budget.

Attachment 1: BS_MICH_ACtuation_Calibration.pdf  17 kB  Uploaded Wed Jul 13 12:08:40 2022  | Hide | Hide all
BS_MICH_ACtuation_Calibration.pdf
Attachment 2: MICH_AS55_Model_Measurement_Comparison.pdf  19 kB  Uploaded Wed Jul 13 12:10:21 2022  | Hide | Hide all
MICH_AS55_Model_Measurement_Comparison.pdf
Attachment 3: MICH_AS55_Noise_Budget.pdf  75 kB  Uploaded Wed Jul 13 12:12:47 2022  | Hide | Hide all
MICH_AS55_Noise_Budget.pdf
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