LSC of PRFPMI has been completed at klog30172. I want to check the signal of WFSf3. Before that, I want to install ASC to improve the alignment after length control. The purpose is initial alignment with PRXARM rather than long-term stability.

As a plan, I would like to install a control that detects from REFL45 QPD1 and QPD2 of WFS and feeds back to ITMX and ETMX. I prepared that WFS today.

• Prepared the DC centering loop for REFL
  I was able to use the DC centering loop for REFL that was already included in DOF5 and DOF6 as is. Also, to monitor the DC centering loop, an ASC line for PRXARM was installed in the ASC_LOCK guardian. I confirmed that it actually works.
  • REFLWFS_ON_FOR_PRXARM (1070): Connected with PREPARE_FOR_POP_PZT (3). Refered to REFLWFS_ON (1050)
  • REFLWFS_DCCENTER_PRXARM (1072): Refered to REFLWFS_DCCENTER (1052)
  • ASC_FOR_PRXARM (1074): [Under construction] The state for moniter DC centering loop
• I set the ASC_overview MEDM screen, SRCL1 filter for ITMX and SRCL2 filter for ETMX. (If it is inconvenient to use the SRCL filter, I will move it to another filter.)
• First, I set the OUTPUT matrix to tilt the mirrors to the same amount on ITMX and ETMX. (FIG1: after inserting the parameter)
  FIG2: PIT of ITMX and ETMX after inserting the parameter to OUTPUT matrix, FIG3: YAW of ITMX and ETMX after inserting the parameter to OUTPUT matrix
• Next, I did phasing of RF45 of REFLWFSQPD1,2. This time, I measured the I phase and Q phase of each QPD against the DOF of ITMX PIT, calculated the phase, and rotated it by that amount. After finished this work, I returned back it to its original value.
  FIG4: Phase of each segment before rotating the phase 
  FIG5: Phase of each segment after rotating
  FIG6: Measuring the I and Q phases of each segment of the ITMX PIT degree of freedom. (REF before turning, REF after turning) When observing the power spectrum, the Q phase signal disappears after turning.
• Next, I measured the sensing matrix of each degree of freedom.(FIG7: ITMX PIT, FIG8: ETMX PIT, FIG9: ITMX YAW, FIG10: ETMX YAW )

• REFL RF45	ITMX PIT	ETMX PIT	ITMX YAW	ETMX YAW
  QPD1	-40.7629	7734.2504	-148.35191	-157.58
  QPD2	-156.5574	-59.9163	-148.9952	23.5779

• I set the input matrix of the ASC_overview screen.(FIG11: Before inserting the parameter, FIG12: after inserting the parameter) However, I have yet to check signal separation.

Note

• When I put null in FB6 of SRC2_PIT and loaded it, it was not reflected. When I looked at the CDS, the CFC of k1asc was now red. I didn't know if I should load it or not, so it's still there. (FIG13)