KAGRA Logbook

Reports 1-1 of 1

MIF (ITF Control)

masayuki.nakano - 17:11 Saturday 18 April 2020 (14234)

Alignment work

The important thing of alignment work is remembering the basics.
First thing we have to do when the alignment is terribly broken, bring everything when it was working.

I tweaked many mirrors many time whole shift long, and sometime lock with terible sensitivity. Finaly, I bring everything back to the yesterday's condition including IMMT1 and IMMT2, then the IFO got back.

Comments to this report:

shinji.miyoki - 17:28 Saturday 18 April 2020 (14235)

!!! Important !!! in alignment work

1) Keep IMMT1 Yaw value at 266. Dont back to less value ! Otherwise the sensitivity will be deteriorated with scattered light noise like noise.

2) Keep IMMT2 Yaw value less than 106.

3) Dont move IMMT1/2 for recovering GR trans. About 0.6 GR trans for Y arm should be accepted.

The important thing of alignment work is remembering the basics. First thing we have to do when the alignment is terribly broken, bring everything when it was working.

!!! Important !!! in alignment work

The important thing of alignment work is remembering the basics.
First thing we have to do when the alignment is terribly broken, bring everything when it was working.