KAGRA Logbook

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VAC (Valves & Pumps)

nobuhiro.kimura - 14:48 Thursday 02 February 2023 (23804)

Results of leak test for X-15 vacuum pump unit

When:
31/Jan./2023
From 13:15 to 13:56

Workers:
N. Kimura
H. Yasui
M. Takahashi

Task:
We performed a vacuum leak test for X-15 vacuum pump unit using a helium leak detector and helium gas.
(X-15 vacuum pump unit is installed position of 1500 m of X-arm.)
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^-13Pam^3/s, confirming that there was no leakage > ~1 x 10^-13 Pam^3/s .
Helium background during the test ranged was < 1.0x 10^-13 Pam^3/s.

Activated Ion pump of X-15 vacuum pump unit was connected to the X-arm on 1st/Feb.

Images attached to this report

Comments to this report:

nobuhiro.kimura - 15:14 Thursday 02 February 2023 (23806)

When:
1/Feb./2023
From 9:50 to 9:53

Workers:
N. Kimura
H. Yasui

Task:
We connected activated Ion pump of X-15  to the X-arm duct.
Status of the Ion pump and gate valves were as follows;
9:50
Ion pump:
The pressure displayed on the pressure gage: 7.1 x 10^-7 Pa.
Pressure displayed on the Ion pump power supply: 5.4 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply : 5.9 kV and 78 x 10^-6 A.
GV between X-arm duct and the pump unit: CLOSE
GV between Ion pump and TMP: OPEN

9:52
GV between Ion pump and TMP: CLOSE
The pressure displayed on the pressure gage: 7.8 x 10^-7 Pa.
9:53
GV between X-arm duct and the pump unit: OPEN
The pressure displayed on the pressure gage: 1.3 x 10^-6 Pa.
TMP turned off