Fabian, Fujii,
= PRM =
-- Based on yesterday's measurement (klog#8306), it was suspected that IM was touching to IMR.
-- Then we found the following three stuffs:
1. IM-H1 flag was touching to the baody horizontally.
2. Some cables out of 4 which is from IM (cables for TM-OSEMs) were touching to IRM gently.
3. Vertical OSEM flags were touching to the OSEM-body, (the flags were shifted horizontally.)
== Tuning work ==
-- For 1, the panel of IM-H1 was shifted so that the flag came to the center of the OSEM cavity.
-- Then we measured a trasfer function (TF) from IML to IML but the TF was still wierd.
-- For 2, we removed one unsued cabe clamp on IMR(see fig1 and fig2.) in ordet to avoid touching
-- Then we measured a trasfer function (TF) from IML to IML but the TF was still wierd.
-- For 3, We have changed the vertical OSEMs-plate horizontally. This was done for V1/V2/V3.
-- Then we measured a trasfer function (TF) from IML to IML and the TF was healthy this time!
== Next ==
-- Tune the vertical OSEMs vertically, for V1 and V2.
-- Measure all the measureable transfer functions for the healthy check.
== Note ==
-- The photos are stored in:
https://photos.app.goo.gl/PUex34gNQ2ANobqy7
Fabian, Yoshinori,
on 2019, March 5th (Wed),
= PRM =
== What was done ==
-- After tuning the vertical OSEMs vertically, for V1 and V2, we kicked the IM accidentally and the followings were changed. Then we had to revisit the Tuesday’s starting point:
-- SF-GAS
-- BF-body height, its tilt in roll, its torsion in yaw.
-- we already compensated the BF-body tilt by the picomotor on the BF-cap. Then the IM-yaw was adjusted along with OSEM signals (thus the QPD does not have the light on it now).
== Next ==
-- we will compensate the yaw shift by the traverser so that the OpLev light is on the QPD.
-- after these work, all the transfer functions will be measured.
-- In addition to this issue, the satellite boxes looked still old type. They are to be replaced and checked.
Fabian, Yoshinori,
Log on March 11th, 2019,
= PRM =
-- As reported in the previous log, we tried the following*
> == Next ==
> -- we will compensate the yaw shift by the traverser so that the OpLev light is on the QPD.
> -- after these work, all the transfer functions will be measured.
-- By following the procedure reported in klog#581, we slided the traverser in +Yaw by 156 mdeg('= 30mdeg*6 - 10mdeg*3 +3mdeg*2) si that the oplev was centered.
-- The used script was the followinfg:
/kagra/Dropbox/Subsystems/VIS/TypeBp/Traversers/cont_serial.py
-- Then we measured some transfer functions of the IM-stage, and found some weird stuffs:
-- one wierd peak in a vertical transfer function (This looked a coupling from IM-L or T).
-- Actually, one OSE flag was close to the cavity though we cannot shift the OSEM plase anymore (There was no torelance anymore). Tilting BF-body from client machine could not solve this issue. The actual flag position should be checked visually.
-- the peak at 4.1 Hz was shifted to 4.4 Hz which was RM-P mode. and the frequency of the notch in damping filter was changed along with this, and the gain was slightly changed (from 1 to 0.8).
-- Now all the filters can be closed though, this system seems to include weird issues. Some more (visual) check would be necessary.
