KAGRA Logbook

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IOO (IMMT)

guiguo.ge - 18:19 Wednesday 09 January 2019 (7595)

Installation of IMMT Type-C shield

Sato, Kokeyama, Ge Guiguo,

Today we installed IMMT Type-C shield. To keep the chamber clean we put a pair of kouch filters in front of the 80cm flange and opened a smaller flange the other side of IMMT1&2 . We alse opened a medium flange of IMMT1 to install backside shield.

1,we used screws to fixed IMMT1 & IMMT2 Type-C suspension to optical table
2,fixed IMMT Base Angle to IMMT type-C suspension(Fig3 show the Base Angle of IMMT 1)
3,fixed IMMT shield to IMMT Base Angle

Fig1&2 are IMMT 2, Fig 3,4,5 are IMMT 1

Images attached to this report

Comments to this report:

keiko.kokeyama - 19:04 Wednesday 09 January 2019 (7599)

Some supplimentary information:

- IMMT1 got three shilds (of the 4 surfaces), where as IMMT2 has only one sheild on the front.

- IMMT1 moved some reasonable amount as shown below, because of this big surgery. We did not move the positions back this time - leaving it for later with the main ifo alignment. The magnets or anything else were not touching anywhere. The oplev readings before and after this work were:

(Before)
IMMT1 PIT: -34
IMMT1 YAW: 48

IMMT2 PIT: 204
IMMT2 YAW: 19

(After)
IMMT1 PIT: 201
IMMT1 YAW: -251
(out of the range of the segments)

IMMT2 PIT: 216
IMMT2 YAW: 20
(did not move very much)