KAGRA Logbook

VIS (SRM)

ryutaro.takahashi - 16:48 Tuesday 10 February 2026 (36327)

Preparation for SRM installation

I checked the condition around the SRM chamber.

Feedthrough flanges: The D-sub cables were put from the flanges to the cable rack (Picture #1) on the side of the booth.

ICF203 on the bottom chamber for the IRM damper. The present flange with one D-sub 9pin port will be replaced with the flange with four D-sub 9pin ports (Picture #2).
ICF203(P6) on the top chamber for the FLDACC H2 (Picture #3).
ICF203(P3) on the top chamber for the FLDACC H1 and H3 (Picture #4).

SRM mirror holder: I checked the mirror holder in the decicator for OMC. The holder was assembled with the jig (Pictures #5 and #6).

IRM damper: The parts for the IRM damper were delivered and checked in the booth (Picture #7).

Images attached to this report

Comments to this report:

satoru.ikeda - 16:06 Tuesday 17 February 2026 (36374)

[Ushiba-san, R.Takahashi-san, Ikeda]

Prepared the model files for FLDACC and IRM dampers.
This time, only model editing was performed; make and install have not yet been executed.

Basic Design
Modifications to k1vissrmt.mdl and k1vissrmp.mdl

・First, all elements broken from the common model due to the K-Log#17302 fix were removed. They were changed to use blocks common with other Type-B models.

・k1vissrmt.mdl
　Added input from adc and output to dac to FLDACC.
Input: adc0_{28,29,30}
Output: dac1_{8,9,10}

・PAYLOAD_MASTER.mdl
Copied PAYLOAD_MASTER (shared by Type-B and Bp) and created a new PAYLOAD_TYPEB_MASTER. Added a block for the IRM damper inside it.

・k1vissrmp.mdl
Replaced with the PAYLOAD_TYPEB_MASTER block and added IRM_COIL output as output to the DAC.
Output: dac1_{4,5,6}

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japanese.txt

ryutaro.takahashi - 18:37 Tuesday 17 February 2026 (36378)

[Takahashi, Ikeda]

We installed an LVDT Driver, an LVDT-ACT Distributor, and two High Power Coil Drivers into the SRM rack (Picture #1).

LVDT Driver: S1403138 for FLDACC
LVDT-ACT Distributor: S1503680 for FLDACC
HPCD: S2315291 for FLDACC
HPCD: S2315288 for IRM damper

We checked the FLDACCs transported from NAOJ (Mitaka). Unfortunately, the folded pendulum blocks have been broken (Picture #2). Though the proof masses were fixed with the stopper screws and sims, all of the hinges were cut (Pictures #3 and #4). The stopper screws may not be enough to fix the proof mass tightly. It has a high risk to transport assembled FLDACCs. Therefore, the folded pendulum blocks should be assembled at the site. Spare blocks will be sent with the fixing covers that sandwich the block with the piercer bolts.

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