KAGRA Logbook

With KTanaka, Ushiba, Michael,

Summary

At first, we adjusted PLLY TEMPY_bias to lock the ALS-Y loop.
Then, after the initial alignment for the Xarm, we performed the cavity scan, and found the resonant frequencies between carrier and f1, and f2 were not too close.
But, we changed the LO frequency by -5Hz to make more margin. (We confirmed that these 3 don't have overlap.)
After this work, we took the alignment for Xarm, Yarm, OMC, and PRMI, and locked PRFPMI.
Then DC centering and adjustment of WFS signals were performed.

Details

PLLY
- By whatching K1:ALS-Y_BEAT_ERR_OUT_DQ, change the TEMPY_bias to lock ALS_PLLY.
- CommissioningDock -> LSC -> ALS OVERVIEW -> Left bottom
- Procedure
  - Request DOWN to ALS_PLLY
  - Change TEMPY_bias with monitoring K1:ALS-Y_BEAT_ERR_OUT_DQ
  - Request PLL_LOCKED to ALS_PLLY guardian
- TEMPY_bias:
  - -0.440V -> did not work.
  - -0.545V -> Locked
Xarm cativy scan
- Xarm alignment adjustment was performed by Yokozawa-san
- Ref: klog-30825
  - Request DOWN to Xarm
  - Change Y offset of ETMX TM SET: -18.1 -> -22.1
  - Requested ALS_LOCKED to XARM
  - Changed the gain of FB of MCL to be 1 as soon as posible.
  - With reference to ENGAGED_ALS_CARM state in "LSC_LOCK" guardian, we performed the following steps
    - Turn ON "FM4" in FILT_MCL
    - Turn ON "IN2" in CMS(Common mode survo) IMC survo (CommissioningDock -> Common Mode Servos -> IMC -> K1:IMC-SERVO_INsEN_SW_ON)
    - Turn OFF "FM2" in FILT_MCL
    - Change "IN2" gain to 24 in CMS_CARM survo. (K1:LSC-CARM_SERVO_IN2GAIN)
    - Turn ON "COMBOOST" in CMS_CARM survo. Turn ON 1 -> Turn ON 2.
    - Turn ON "FM5" in FILT_MCL
  - This time, as we want to see are f1 and f2, we did not need to change the laser power like what Hirose-san's group did.
  - Change the offset of SUMMING SURBO from -27000 to +27000 with 300 seconds RAMP time.
    - Open SUMMING NODE CMS
    - Right click -> Execute -> FB screen -> click SLOWOUT_CALI
    - Set 300s to the RAMP time
    - Change the offset from -27000 to +27000
  - Monitor the flash with K1:LSC-TR_IRX_NORM_OUT_DQ, K1:ALS-SUM_OFS_SLOWOUT_CALI_OUT_DQ, and camera TMSX_IR
    - from 27000 to -27000
    - 1st: TEM00 (offset: 25193)
    - 2nd: TEM01 (offset: 11405)
    - 3rd: TEM00 (offset: 5363)
    - 4th: TEM01 (offset: -8268)
    - 5th: TEM00 (offset: -14155)
- Make the alignment back: Change Y offset of ETMX TM SET from -22.1 to -18.0
- Scaned it again
  - Figures: fig1, fig2
- We change the modulation frequency.
  - 5.624 369 113 MHz -> 5.624 364 113 MHz
- Check each peaks
  - df between TEM00 and TEM01 of carrier: 5669.5 [counts]
  - df between TEM00 and TEM01 of carrier: 13779.6
  - df between TEM00 and unknown of RF45: 1700.8
  - df between TEM00 and unknown of RF45: 2466.2
  - df between TEM00 and unknown of RF45: 3394.2
  - df between TEM00 and unknown of RF45: 4159.6
  - We can not see any overlap. So let's use this modulation freq.
  - Figures: fig3, 4
Alignemnt adjustment
- Adjustment of ETMY alignment
  - State at IRY_LOCKED
  - P: -30.2 -> -34.1
  - Y: 3.9 -> 3.1
- Adjusument of BS
  - State at ALIGNING_YARM
  - P: 10.7 -> 14.7
  - Y: -14.7 -> -16.3
- OMC
  - Close GRX and Close GRY
  - Requested IRX_LOCKED
  - Requested ALIGNING_TO_OMC
  - Open he GRX, GRY shutters.
- PRMI
  - Change total(deg) to 176.
  - Requested ALIGNING_PRMI
  - Aalignment adjustment for PRM
    - State: requesting ALIGNING_PRMI
    - See POP_PDA2_RF90_I_ERR_DQ
    - P: 39.0 -> 2.0
    - Y: -56.6 -> -56.6
Try lock PRFPMI
- Requested ENGAGE_WFSDC -> locked.
WFS alignment adjustment
- DC centering
  - Use REFL_WFS picomotors
- Change set point on ASC_SERVO_VIEW_ARM.adl
  - K1ASC-DHARD_P
  - K1ASC-CHARD_P
  - K1ASC-DHARD_Y
  - K1ASC-CHARD_Y