aLIGO LHO Logbook

H1 ISC

sheila.dwyer@LIGO.ORG - posted 16:30, Friday 23 August 2024 - last comment - 15:31, Monday 26 August 2024(79670)

operator requests for the weekend

We can edit this list as needed.

We are having trouble locking this afternoon because of the wind, but we have some requests for the operators this weekend if they are able to relock.

We've changed the nominal locking power to 61W, in the hopes that this might avoid the PI or let us pass through it quickly.

When we first get to NLN, please take the IFO to NLN_CAL_MEAS and run a calibration sweep. If we stayed locked for ~1.5 hours, please re-run, and if we are ever locked for more than 3 hours please re-run again.

After the calibration has run, we would like to check the camera set points since we have seen earlier today that they are not optimal and that might be related to our PI problem. We already updated the offset for PIT1, but we'd like to check the others. We modified the script from 76695 to engage +20 dB filters in all these servos to speed up the process. Each DOF should take a little more than 15 minutes. We'd like these run with the POP beam diverter open, so we can see the impact on POP18 and POP90. The operators can run this by going to /ligo/gitcommon/labutils/beam_spot_raster and typing python camera_servo_offset_stepper.py 1 -s now (and once 1 completes, run 2 and 3 if there's time.)

I've added 3 ndscope templates that you can use to watch what these scripts do. the templates are in userapps/asc/h1/templates/ndscope/move_camera_offsets_{BS, DOF2_ETMX, DOF3_ETMY}.yml We'd like to see if any of these can increase the arm powers, or POP18. If there is a better value found, it can be set to the default by updating lscparams.py lines 457 to 465.

Comments related to this report

elenna.capote@LIGO.ORG - 17:00, Friday 23 August 2024 (79675)

Link

The injections for LSC feedforward can also be taken after the tasks Sheila mentions here. Do these measurements after at least 2-3 hours of lock.

The templates used for these measurements are found in "/opt/rtcds/userapps/release/lsc/h1/scripts/feedforward"

Steps:

go to NLN cal meas
open LSC feedforward medm: sitemap>LSC overview > IFO FF
this is where the filter banks we mention are located
top bank is PRCLFF, next is MICHFF and then SRCLFF1 and SRCLFF2. only SRCLFF1 is in use
start with the MICH preshaping measurement:
- Ramp MICHFF gain to 0
- turn off all filters except the high pass in FM10
- turn off input to MICHFF filter bank
- ramp MICHFF gain back to 1
- run template MICHFF_excitation_ETMYpum.xml for 30 averages and save
- undo set up by: ramp gain to zero, turn on filters, turn on input, ramp gain back to 1
next, measure the MICH feedforward by running MICH_excitation.xml for 30 averages and save
- do this with the MICH feedforward on because we are measuring a residual
next, measure the SRCL preshaping
- follow the steps for the MICH set up, but do them in the SRCLFF1 bank. leave on FM10, the high pass
- measure using SRCLFF_excitation_ETMYpum.xml for 30 averages and save
- reset the filter bank following the MICH steps
next, measure SRCL feedforward
- first, ramp the SRCLFF gain to 1
- measure using SRCL_excitation.xml for 30 averages and save
- ramp SRCL FF gain back to nominal value after measurement is done
next, measure PRCL feedforward using PRCL_excitation.xml for 30 averages and save
no PRCL preshaping measurement is required

elenna.capote@LIGO.ORG - 15:31, Monday 26 August 2024 (79724)

Link

Putting in another request for LSC feedforward measurements. Please disregard the above instructions and instead follow these:

go to NLN cal meas
open LSC feedforward medm: sitemap>LSC overview > IFO FF
open the template "/opt/rtcds/userapps/release/lsc/h1/scripts/feedforward/MICH_excitation.xml"
- ramp MICHFF gain to zero
- the template is set to run accumulative. no need to change this!
- run the template for at least 30 averages, and then stop. since it is on accumulative, you will need to watch the template and stop it yourself.
- save the file as is, no need to change the name
- ramp MICHFF gain back to nominal
repeat this process using template "/opt/rtcds/userapps/release/lsc/h1/scripts/feedforward/SRCL_excitation.xml"
- this time, ramp SRCLFF1 gain to zero
- take measurement following steps detailed above
- ramp gain back to nominal
repeat again using "/opt/rtcds/userapps/release/lsc/h1/scripts/feedforward/PRCL_excitation.xml"
- ramp PRCLFF gain to zero if not already zero
- take measurements as above
- ramp back to nominal

There is no need to take any other measurements at this time! I have copied the exact filenames from the folder. Do not change the filename when you save.