aLIGO LHO Logbook

H1 CAL

francisco.llamas@LIGO.ORG - posted 17:06, Monday 25 March 2024 - last comment - 17:32, Thursday 17 October 2024(76699)

Changed SDF values for Pcal Yend

DriptaB, LouisD, TonyS, FranciscoL

We noticed a 0.4% change from the value at the end of O4a for the X/Y ratio. We found alog 76562 where the Pcal EY EPICS values were changed. We have now changed them back to O4a values. See screenshot of SDF screen to find values. We will follow up with an updated value of X/Y to see if anything went wrong.

For future reference: steps to update SDF

'caput' the channels to be changed
sitemap --> CAL EX(Y) --> GDS --> SDF TABLE --> ACCEPT (under select all, only afer triple checking numbers) --> CONFIRM.
SDF RESTORE SCREEN --> ! SELECT REQUEST FILE --> open "safe.snap" --> LOAD TABLE. Look for differences and confirm changes if needed (was not needed for EY).
Load OBSERVE.snap by following step (3).
Open FORCE COEFF CALCULATION and check that changes were applied.

Images attached to this report

Comments related to this report

anthony.sanchez@LIGO.ORG - 17:32, Thursday 17 October 2024 (80736)

Link

UPDATED Instructions!!!
For future reference: steps to update SDF

'caput' the channels to be changed
Open OBSERVE.snap by following these steps:
sitemap --> CAL EX(Y) --> GDS --> SDF TABLE
Save the new EPICS value to OBSERVE.snap:
Find the channel that you have changed the EPICS variable for and click the ACCEPT button on the far right. (under select all, only afer triple checking numbers). then Please make sure you click the big green CONFIRM button.
Open FORCE COEFF CALCULATION and check that changes were applied.
Congratulations you just saved EPICS values to OBSERVE.snap!
Load safe.snap by following these steps:
SDF RESTORE SCREEN --> ! SELECT REQUEST FILE --> open "safe.snap" --> LOAD TABLE. Look for differences and confirm changes if needed.
Save the new Epics values into the Safe.snap by following step 3 again from here.
To confirm that your values were correctly saved into the safe.snap file please use the following terminal commands:
Check Xarm values:
cat /opt/rtcds/lho/h1/target/h1calex/h1calexepics/burt/safe.snap | grep FORCE_COEFF && cat /opt/rtcds/lho/h1/target/h1calex/h1calexepics/burt/safe.snap | grep XY_COMPARE_CORR_FACT

Check Yarm Values:
cat /opt/rtcds/lho/h1/target/h1caley/h1caleyepics/burt/safe.snap | grep FORCE_COEFF && cat /opt/rtcds/lho/h1/target/h1caley/h1caleyepics/burt/safe.snap | grep XY_COMPARE_CORR_FACT

If that didn't work..... please request expert assistance for more guidance.