Abstract:
We tried to activate twelve ion pumps installed on X-arm, Y-arm, IXV and IYV from 17/Jan./2023 to 20/Jan./2023.
The operating status on 20/Jan./2023 of each pump we started up is recorded on the K-log.
Nine of the twelve ion pumps were successfully activated. The remaining three pumps could not be activated due to failure of high-voltage power supply.
The causes of the failure were presumed to be a high-voltage leakage due to humidity.
See the note below for the locations of the ion pumps were not activated.
Workers:
N. Kimura
H. Yasui
M. Takahashi
X-arm:
X-27 (Position: 2700 m):
Status: Not activated, evacuated by TMP and Dry-pump
12:58, 20/Jan./2023
The pressure displayed on the pressure gage: 2.3 x 10^-6 Pa.
The ion pump installed at X-27 could not be sactivated due to a high voltage power failure.
Therefore, vacuum evacuation at the X-27 point is continued by TMP and Dry-pump. See attached photos,
X-21 (Position: 2100 m):
Status: Activated, evacuated by Ion Pump
13:05, 20/Jan./2023
The pressure displayed on the pressure gage: 1.8 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 2.0 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.1 kV and 299 x 10^-6 A.
The power consumption of the Ion pump power supply: 16 VA. (Single phase AC 200 V, current 0.08 A
X-15 (Position: 1500 m):
Status: Activated, evacuated by Ion Pump
13:12, 20/Jan./2023
The pressure displayed on the pressure gage: 1.0 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 3.8 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 560 x 10^-6 A.
The power consumption of the Ion pump power supply: 16 VA. (Single phase AC 200 V, current 0.08 A)
Noticed:
Dew condensation inside the box that houses the high-voltage power supply.
X-10 (Position: 1000 m):
Status: Activated, evacuated by Ion Pump
13:20, 20/Jan./2023
The pressure displayed on the pressure gage: 1.2 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 5.5 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 820 x 10^-6 A.
The power consumption of the Ion pump power supply: 22 VA. (Single phase AC 200 V, current 0.11 A)
X-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
13:27, 20/Jan./2023
The pressure displayed on the pressure gage: 2.4 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.0 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.2 kV and 157 x 10^-6 A.
The power consumption of the Ion pump power supply: 18 VA. (Single phase AC 200 V, current 0.19 A)
Noticed:
Dew condensation inside the box that houses the high-voltage power supply.
Y-arm:
Y-27 (Position :2700 m):
Status: Activated, evacuated by Ion Pump
The pressure displayed on the pressure gage: 3.0 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.8 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 274 x 10^-6 A.
The power consumption of the Ion pump power supply: 22 VA. (Single phase AC 200 V, current 0.11 A)
Y-21 (Position: 2100 m):
Status: Activated, evacuated by Ion Pump
10:30, 20/Jan./2023
The pressure displayed on the pressure gage: 1.4 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.9 x 10^-5 Pa.
The anode current displayed on the Ion pump power supply : 600 x 10^-6 A.
The power consumption of the Ion pump power supply: 26 VA. (Single phase AC 200 V, current 0.13 A)
Y-15 (Position: 1500 m):
10:36, 20/Jan./2023
Status: Not activated, evacuated by TMP and Dry-pump
The pressure displayed on the pressure gage: 7.7 x 10^-7 Pa.
The ion pump installed at Y-15 could not be activated due to a high voltage power failure.
Therefore, vacuum evacuation at the Y-15 point is continued by TMP and Dry-pump.
Y-10 (Position: 1000 m):
Status: Not aActivated, evacuated by TMP and Dry-pump
10:56, 20/Jan./2023
The pressure displayed on the pressure gage: 7.7 x 10^-7 Pa.
The ion pump installed at Y-10 could not be activated due to a high voltage power failure.
Therefore, vacuum evacuation at the Y-10 point is continued by TMP and Dry-pump.
Y-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
11:07, 20/Jan./2023
The pressure displayed on the pressure gage: 2.0 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.5 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 215 x 10^-6 A.
The power consumption of the Ion pump power supply: 14 VA. (Single phase AC 200 V, current 0.07 A)
Center area:
IXV (Position: Center 2F):
Status: Activated, evacuated by Ion Pump
14:13, 20/Jan./2023
The pressure displayed on the pressure gage: 5.9 x 10^-6 Pa
The pressure displayed on the Ion pump power supply: 4.9 x 10^-6 Pa
The anode voltage and current displayed on the Ion pump power supply: 6.3 kV and 490 x 10^-6 A
IYV (Position: Center 2F):
Status: Activated, evacuated by Ion Pump
14:13, 20/Jan./2023
The pressure displayed on the pressure gage :1.0 x 10^-5 Pa
The pressure displayed on the Ion pump power supply: 6.1 x 10^-6 Pa
The anode voltage and current displayed on the Ion pump power supply: 6.2 kV and 921 x 10^-6 A
Abstract:
On 26/Jan./2023, we checked the operational status of the ion pumps of X&Y-arms these were activated up last week.
In addition, as a measure against condensation in the plastic case containing the high-voltage power supply,
we removed the sealant attached to the cable paths in the plastic cases.
See attached photos to confirm before and after.
This was done to introduce tunnel air into the plastic cases and make the temperature inside the case the same as the tunnel temperature.
In addition, some of the moisture-absorbing material installed in the plastic case was replaced.
Workers:
N. Kimura
M. Takahashi
X-arm:
X-27 (Position: 2700 m):
Status: Not activated, evacuated by TMP and Dry-pump
10:22
The pressure displayed on the pressure gage: 2.3 x 10^-6 Pa.
X-21 (Position: 2100 m):
Status: Activated, evacuated by Ion Pump
10:27
The pressure displayed on the pressure gage: 1.8 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 8.9 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.1 kV and 129 x 10^-6 A.
X-15 (Position: 1500 m):
Status: Activated, evacuated by Ion Pump
The pressure displayed on the pressure gage: 1.0 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.2 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.0 kV and 176 x 10^-6 A.
Noticed:
Dew condensation inside the box that houses the high-voltage power supply.
X-10 (Position: 1000 m):
Status: Activated, evacuated by Ion Pump
The pressure displayed on the pressure gage: 1.2 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 7.9 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 5.5 kV and 106 x 10^-6 A.
X-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
The pressure displayed on the pressure gage: 2.7 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.3 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.2 kV and 192 x 10^-6 A.
Noticed:
Dew condensation inside the box that houses the high-voltage power supply.
Y-arm:
Y-27 (Position :2700 m):
Status: Activated, evacuated by Ion Pump
11:32
The pressure displayed on the pressure gage: 3.0 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.7 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.2 kV and 260 x 10^-6 A.
Y-21 (Position: 2100 m):
Status: Activated, evacuated by Ion Pump
11:38
The pressure displayed on the pressure gage: 1.4 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.1 x 10^-5 Pa.
The anode current displayed on the Ion pump power supply : 420 x 10^-6 A.
Y-15 (Position: 1500 m):
11:44
Status: Not activated, evacuated by TMP and Dry-pump
The pressure displayed on the pressure gage: 7.4 x 10^-7 Pa.
Y-10 (Position: 1000 m):
Status: Not aActivated, evacuated by TMP and Dry-pump
11:47,
The pressure displayed on the pressure gage: 1.1 x 10^-6 Pa.
Y-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
11:52
The pressure displayed on the pressure gage: 2.1 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.6 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.0 kV and 237 x 10^-6 A.
Abstract:
On 31/Jan./2023, we checked the operational status of the activated ion pumps of X-arm.
In addition, as a measure against condensation in the plastic case containing the high-voltage power supply,
we removed the sealant attached to the cable paths in the plastic cases.
See attached photos to confirm before and after.
Workers:
N. Kimura
H. Yasui
X-arm:
X-27 (Position: 2700 m):
Status: Not activated, evacuated by TMP and Dry-pump
15:24
The pressure displayed on the pressure gage: 2.2 x 10^-6 Pa.
X-21 (Position: 2100 m):
Status: Activated, evacuated by Ion Pump
15:29
The pressure displayed on the pressure gage: 1.9 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 8.0 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.0 kV and 118 x 10^-6 A.
X-15 (Position: 1500 m):
Status: Activated, evacuated by Ion Pump, but not connected with the duct due to the leak test
15:35
The pressure displayed on the pressure gage: 2.2 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 7.4 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 1.1 x 10^-3 A.
Noticed:
Dew condensation inside the box that houses the high-voltage power supply.
X-10 (Position: 1000 m):
Status: Activated, evacuated by Ion Pump
15:40
The pressure displayed on the pressure gage: 1.3 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 8.3 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply: 5.4 kV and 109 x 10^-6 A.
X-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
15:45
The pressure displayed on the pressure gage: 2.6 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.5 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 220 x 10^-6 A.
Noticed:
Dew condensation inside the box that houses the high-voltage power supply.
Abstract:
On 2nd/Feb./2023, we checked the operational status of the activated ion pumps of X&Y-arm.
In addition, as a measure against condensation in the plastic case containing the high-voltage power supply,
we removed the sealant attached to the cable paths in the plastic cases.
Workers:
N. Kimura
H. Yasui
X-arm:
X-27 (Position: 2700 m):
Status: Not activated, evacuated by TMP and Dry-pump
10:15
The pressure displayed on the pressure gage: 2.2 x 10^-6 Pa.
X-21 (Position: 2100 m):
Status: Activated, evacuated by Ion Pump
10:19
The pressure displayed on the pressure gage: 1.8 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 7.2 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.1 kV and 107 x 10^-6 A.
Noticed:
Dew condensation in the box is being improved by replacing the moisture absorbing material.
X-15 (Position: 1500 m):
Status: Activated, evacuated by Ion Pump, but not connected with the duct due to the leak test
10:23
The pressure displayed on the pressure gage: 1.3 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 8.0 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply: 5.9 kV and 116 x 10^-6 A.
Noticed:
Note: Dew condensation in the box is being improved by replacing the moisture absorbing material.
X-10 (Position: 1000 m):
Status: Activated, evacuated by Ion Pump
10:28
The pressure displayed on the pressure gage: 1.3 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 7.9 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply: 5.4 kV and 103 x 10^-6 A.
Noticed:
Dew condensation in the box is being improved by replacing the moisture absorbing material.
X-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
10:33
The pressure displayed on the pressure gage: 2.6 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.6 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.2 kV and 23 7x 10^-6 A.
Noticed:
Dew condensation in the box is being improved by replacing the moisture absorbing material.
Y-arm:
Y-27 (Position: 2700 m):
Status: Activated, evacuated by Ion Pump
The pressure displayed on the pressure gage: 2.9 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.7 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.2 kV and 254 x 10^-6 A.
Y-21 (Position: 2100 m):
Status: Activated, evacuated by Ion Pump
11:23
The pressure displayed on the pressure gage: 1.4 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 4.7 x 10^-6 Pa.
The anode current displayed on the Ion pump power supply : 170 x 10^-6 A.
Y-15 (Position: 1500 m):
Status: Not activated, evacuated by TMP and Dry-pump
11:29
The pressure displayed on the pressure gage: 7.4 x 10^-7 Pa.
Y-10 (Position: 1000 m):
Status: Activated, evacuated by Ion Pump
Status: Not activated, evacuated by TMP and Dry-pump
11:29
The pressure displayed on the pressure gage: 1.1 x 10^-6 Pa.
Y-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
11:38
The pressure displayed on the pressure gage: 2.1 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.6 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 239 x 10^-6 A.
Noticed:
Dew condensation in the box is being improved by replacing the moisture absorbing material.
Abstract:
We checked the operational status of the activated ion pumps of IXV and IYV.
See below for comfirmed status. The activated ion pumps of IXV and IYV are in normal operation.
Workers:
N. Kimura
H. Yasui
Center area:
IXV (Position: Center 2F):
Status: Activated, evacuated by Ion Pump
11:26, 3/Feb./2023
The pressure displayed on the pressure gage: 4.4 x 10^-6 Pa
The pressure displayed on the Ion pump power supply: 2.4 x 10^-6 Pa
The anode voltage and current displayed on the Ion pump power supply: 6.2 kV and 363 x 10^-6 A
IYV (Position: Center 2F):
Status: Activated, evacuated by Ion Pump
11:27, 3/Feb./2023
The pressure displayed on the pressure gage :not confirmed
The pressure displayed on the Ion pump power supply: 2.5 x 10^-6 Pa
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 372 x 10^-6 A
Abstract:
On 8/Feb./2023, we checked the status of the activated ion pumps of X&Y-arm.
In addition, as a measure against condensation in the plastic case containing the high-voltage power supply,
Workers:
N. Kimura
H. Yasui
X-arm:
X-27 (Position: 2700 m):
Status: Not activated, evacuated by TMP and Dry-pump
11:47
The pressure displayed on the pressure gage: 2.3 x 10^-6 Pa.
X-21 (Position: 2100 m):
Status: Evacuated by Ion Pump
11:51
The pressure displayed on the pressure gage: 1.8 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 6.7 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.0 kV and 100 x 10^-6 A.
Noticed:
Threre is no dew condensation in the box.
X-15 (Position: 1500 m):
Status: Evacuated by Ion Pump.
11:54
The pressure displayed on the pressure gage: 1.1 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.0 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.0 kV and 152 x 10^-6 A.
Noticed:
Threre is no dew condensation in the box.
X-10 (Position: 1000 m):
Status: Evacuated by Ion Pump
11:58
The pressure displayed on the pressure gage: 1.3 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 9.2 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply: 5.6 kV and 124 x 10^-6 A.
Noticed:
Threre is no dew condensation in the box.
X-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
12:03
The pressure displayed on the pressure gage: 2.6 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.6 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.2 kV and 242 x 10^-6 A.
Noticed:
Threre is no dew condensation in the box.
Y-arm:
Y-27 (Position: 2700 m):
Status: Evacuated by Ion Pump
The pressure displayed on the pressure gage: 2.9 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.7 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.1 kV and 254 x 10^-6 A.
Noticed:
Threre is no dew condensation in the box.
Y-21 (Position: 2100 m):
Status: Evacuated by Ion Pump
10:43
The pressure displayed on the pressure gage: 1.5 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 4.6 x 10^-6 Pa.
The anode current displayed on the Ion pump power supply : 140 x 10^-6 A.
Noticed:
Threre is no dew condensation in the box.
Y-15 (Position: 1500 m):
Status: Evacuated by TMP and Dry-pump
10:46
The pressure displayed on the pressure gage: 7.5 x 10^-7 Pa.
Y-10 (Position: 1000 m):
Status: Not activated, evacuated by TMP and Dry-pump
10:50
The pressure displayed on the pressure gage: 1.1 x 10^-6 Pa.
Y-2 (Position: 200 m):
Status: Evacuated by Ion Pump
10:54
The pressure displayed on the pressure gage: 2.1 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.6 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 243 x 10^-6 A.
Noticed:Threre is no dew condensation in the box.
On 28/Feb./2023, we checked the status of the activated ion pumps of X&Y-arm.
In addition, as a measure against condensation in the plastic case containing the high-voltage power supply,
Workers:
N. Kimura
H. Yasui
X-arm:
X-27 (Position: 2700 m):
Status: Not activated, evacuated by TMP and Dry-pump
10:53
The pressure displayed on the pressure gage: 2.2 x 10^-6 Pa.
X-21 (Position: 2100 m):
Status: Evacuated by Ion Pump
10:56
The pressure displayed on the pressure gage: 1.9 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 7.1 x 10^-7 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.0 kV and 105 x 10^-6 A.
Noticed:
There is no dew condensation in the box.
X-15 (Position: 1500 m):
Status: Evacuated by Ion Pump.
11:01
The pressure displayed on the pressure gage: 1.1 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.3 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.0 kV and 195 x 10^-6 A.
Noticed:
There is no dew condensation in the box.
X-10 (Position: 1000 m):
Status: Evacuated by Ion Pump
11:05
The pressure displayed on the pressure gage: 1.4 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.6 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.0 kV and 240 x 10^-6 A.
Noticed:
There is no dew condensation in the box.
X-2 (Position: 200 m):
Status: Activated, evacuated by Ion Pump
11:10
The pressure displayed on the pressure gage: 2.3 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.9 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 288 x 10^-6 A.
Noticed:
There is no dew condensation in the box.
Y-arm:
Y-27 (Position: 2700 m):
13:57
Status: Evacuated by Ion Pump
The pressure displayed on the pressure gage: 2.9 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 1.7 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply : 6.1 kV and 253 x 10^-6 A.
Noticed:
There is no dew condensation in the box.
Y-21 (Position: 2100 m):
Status: Evacuated by Ion Pump
14:01
The pressure displayed on the pressure gage: 1.5 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 4.7 x 10^-6 Pa.
The anode current displayed on the Ion pump power supply : 170 x 10^-6 A.
Noticed:
There is no dew condensation in the box.
Y-15 (Position: 1500 m):
Status: Evacuated by TMP and Dry-pump
14:05
The pressure displayed on the pressure gage: 7.5 x 10^-7 Pa.
Y-10 (Position: 1000 m):
Status: Not activated, evacuated by TMP and Dry-pump
14:07
The pressure displayed on the pressure gage: 1.1 x 10^-6 Pa.
Y-2 (Position: 200 m):
Status: Evacuated by Ion Pump
14:11
The pressure displayed on the pressure gage: 2.4 x 10^-6 Pa.
Pressure displayed on the Ion pump power supply: 2.0 x 10^-6 Pa.
The anode voltage and current displayed on the Ion pump power supply: 6.1 kV and 291 x 10^-6 A.
Noticed: There is no dew condensation in the box.