KAGRA Logbook

VIS (PR2)

naoatsu.hirata - 23:37 Tuesday 01 June 2021 (16925)

Setting target at PR2

Preparation

set KOACH filter at +X side of PR2 and +X side of PR3.
open PR2 and PR3 chamber, and open duct between PR2 and PR3.
set vertical laser leveler(green) with shifting tripod, and holizontal laser leveler(red) with normal tripod.

I placed the original target on the security frame of the PR2 HR side and checked the height, and found that the height of the target was about 3mm lower than the reference position. (Fabian reported same value here.)

I assembled new target which was designed for Mid-size baffle adjustment. Some thread depth were not enough, so additional machining is required. After confirming that the height of the target could be adjusted to the refference height, I removed it.

I need to find the horizontal center position of the target, so I was trying to find a line between the recoil masses of the PR2 and PRM with a laser leveler. Since it is difficult for one person to do this, two people will be working on it tomorrow.

See pictures in album PR2 Remedying Work

Comments to this report:

naoatsu.hirata - 23:35 Wednesday 02 June 2021 (16945)

with Yano-san

The new target was cleaned and reassembled after the additional machining.
We set a vertical line between the recoil masses of the PR2 and PRM using a laser leveler(Tajima ZEROG-KJY), and set the new target on the HR side of the PR2.

We measured the height of the center of the flange from the mortar base. It was 1184.5 mm. I checked 3D model, it was 1184mm.

See pictures in album PR2 Remedying Work

naoatsu.hirata - 8:23 Friday 04 June 2021 (16956)

PR2 HR 側のターゲットの水平位置の設定方法について詳しく説明します。

1.ダクトとPR2の間にレーザーレベラー(Tajima ZEROG-KYJ)をセットします。（添付ファイル1）

＊PR2とPRMの距離は約14.8mです。レーザーレベラーには、この目的のために±2mmの誤差があります。

2. レーザーレベラーを平行移動または回転させて、垂直線を PR2 および PRM の反動質量線に合わせます。（添付ファイル2）

＊2名必要です。PRM に 1 人、PR2 にもう 1 人、PHS で相互に通信します。

＊反動質量は上下に縦線があります。これらのラインを使用します。リコイルマスにはロールがあるので、それを考慮する必要があります。

3. PR2 HR 側にターゲットを設定し、ターゲットプレートを垂直および水平レーザーに合わせます。（添付ファイル3）

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naoatsu.hirata - 9:19 Friday 04 June 2021 (16965)

(I'm sorry that I posted in japanese 16956. I post same things in english.)

The following is a detailed explanation of how to set the horizontal position of the target on the PR2 HR side.

1. Set the laser leveler (Tajima ZEROG-KYJ) between the duct and PR2. (Attachment 1)

*The distance between PR2 and PRM is about 14.8m. The distance between PR2 and PRM is about 14.8 m. The laser leveler has an error of ±2 mm for this purpose.

2. Translate or rotate the laser leveler to align the perpendicular line with the recoil mass line of PR2 and PRM. (Attachment 2)

*Two persons are required, one for PRM and the other for PR2, to communicate with each other via PHS.

*There are vertical lines above and below the recoil mass. Use these lines. Recoil mass has rolls, so you need to take that into account.

3. Set the target on the PR2 HR side and align the target plate with the vertical and horizontal lasers. (Attachment 3)

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