KAGRA Logbook

Reports 1-1 of 1

VAC (Valves & Pumps)

nobuhiro.kimura - 15:18 Thursday 02 February 2023 (23802)

Results of leak test for OMMT-OMC on 2nd/Feb./2023

When:

2nd/Feb./2023

Workers:
N. Kimura
H. Yasui
M. Takahashi

Task:
We performed a vacuum leak test for OMMT and OMC fter leak repair (https://klog.icrr.u-tokyo.ac.jp/osl/?r=23775) using a helium leak detector and helium gas.

The tests were performed on all flange connections except the top flange of the OMMT and OMC and the area on the ASC side of the OMC.
The test was conducted with a test sensitivity of ~1 x 10^-12 Pam^3/s, confirming that there was no leakage > ~1 x 10^-11 Pam^3/s .
Helium background during the test ranged from 8.5x 10^-10 Pam^3/s to 1 x 10^-10 Pam^3/s.
Leakage testing of the flanges in the area on the ASC side is scheduled for 3rd/Feb..

Images attached to this report

Comments to this report:

nobuhiro.kimura - 15:25 Friday 03 February 2023 (23826)

When:

3rd/Feb./2023

Workers:
N. Kimura
H. Yasui

Task:
We performed a vacuum leak test for OMMT and OMC fter leak repair (https://klog.icrr.u-tokyo.ac.jp/osl/?r=23775) using a helium leak detector and helium gas.

The tests were performed on the area on the AS area side (+X side of OMC) of the OMC and others.
The test was conducted with a test sensitivity of ~1 x 10^-12 Pam^3/s, confirming that there was no leakage > ~1 x 10^-11 Pam^3/s .
Helium background during the test ranged aroud ~1.55 x 10^-10 Pam^3/s.
We conclud there are no leakeage on OMMT and OMC lager than ~1 x 10^-11 Pam^3/s, and can open the gate valve between SRM and OMMT.