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 Wed Mar 6 18:14:33 2013, Manasa, Summary, LSC, Calibration of BS, ITMX and ITMY actuators 
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 Thu Mar 7 01:43:35 2013, yuta, Update, LSC, calibrated MI differential length spectra
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Fri Mar 8 02:17:04 2013, yuta, Update, LSC, calibration of PRM actuator
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Fri Mar 8 03:07:19 2013, yuta, Update, LSC, calibrated PRM-ITMY length spectra
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Message ID: 8255
Entry time: Fri Mar 8 02:17:04 2013
In reply to: 8242
Reply to this: 8256
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| Author: |
yuta |
| Type: |
Update |
| Category: |
LSC |
| Subject: |
calibration of PRM actuator |
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[Manasa, Yuta]
We measured AC response of PRM actuator using PRM-ITMY cavity.
Result is
PRM: (19.6 +/- 0.3) x 10^{-9} (Hz/f)^2 m/counts
It is almost the same as in 2011 (elog #5583). We took the same procedure as what Kiwamu did.
What we did:
1. Aligned PRMI in usual procedure, mis-aligned ITMX and locked PRM-ITMY cavity using REFL55_Q_ERR. POP DC was about 18 when locked.
2. Made UGF of PRM-ITMY cavity lock at 10 Hz and introduced elliptic LPF at 50 Hz(OLTF below).
3. Measured transfer function from C1:LSC_ITMY_EXC to C1:LSC_REFL55_Q_ERR. Dividing this by ITMY actuator response(measured in elog #8242) gives calibration of REFL55_Q.
4. Measured transfer function from C1:LSC_PRM_EXC to C1:LSC_REFL55_Q_ERR to calibrate PRM actuator.
Result:
Calibration factor for REFL55_Q for PRM-ITMY cavity was (1.37 +/- 0.02) x 10^9 counts/m (plot below). Error is mainly from statistical error of the average.
Measured AC response (50-200 Hz) of PRM is below.
Next:
- Measure free-run length spectrum of PRM-ITMY cavity and compare with MICH free-run. |