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Task #1129

open

Wire Repair

Added by Sho Nagao 9 days ago. Updated about 7 hours ago.

Status:
Feedback
Priority:
Urgent
Assignee:
Jin Takahashi
Start date:
08/25/2025
Due date:
% Done:

0%

Estimated time:
Spent time:
258.00 h
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 #2

Updated by Jin Takahashi 8 days ago

  • Status changed from New to In Progress

Status
Wire

Layer col row wire status
2nd 7 30 Field Repaired
2nd 5 35 Field Pulled out the wire
2nd 35 35 Field Pulled out the wire
2nd 35 36 Field Pulled out the wire
2nd 34 35 Field Pulled out the wire
4th 7 11 Field Repaired
Layer col row wire status
2nd 5 31 Anode Pulled out the wire
2nd 6 31 Anode Pulled out the wire
4th 107 13 Anode Pulled out the wire
4th 10 13 Anode Pulled out the wire
4th 12 13 Anode Pulled out the wire

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Kapton tape
2025/08/15
When we tried to replace [2nd 7-30 Field wire], the kapton tape remained on the top of the nearby feedthrough.

2025/08/25
Using dust jet & long carbon pipe, we dropped the tape down below.
The tape's current location is between 1st layer shield wires' feedthrough (col:2~5, Row:46) and Mylar just behind the wall on the short side.

Memo
We need to check if we can access the chamber from below by fishing up the chamber .

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 #3

Updated by Jin Takahashi 5 days ago

Status
2025/8/27
Wire
All the Field wires are repaired
Layer col row wire status
2nd 7 30 Field Repaired
2nd 5 35 Field Repaired
2nd 35 35 Field Repaired
2nd 35 36 Field Repaired
2nd 34 35 Field Repaired
4th 7 11 Field Repaired
Layer col row wire status
2nd 5 31 Anode Pulled out the wire
2nd 6 31 Anode Pulled out the wire
4th 107 13 Anode Pulled out the wire
4th 10 13 Anode Pulled out the wire
4th 12 13 Anode Pulled out the wire

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Kapton tape
2025/08/25
The tape's current location is between 1st layer shield wires' feedthrough (col:2~5, Row:46) and Mylar just behind the wall on the short side.

Memo
Discussions are underway regarding the work to lift the chamber around November.

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 #4

Updated by Jin Takahashi 5 days ago

  • Status changed from In Progress to Feedback
Status
2025/8/29
All the wires are repaired (6 field wires, 5 anode wires)
Layer col row wire status
2nd 7 30 Field
2nd 5 35 Field
2nd 35 35 Field
2nd 35 36 Field
2nd 34 35 Field
4th 7 11 Field Repaired
2nd 5 31 Anode
2nd 6 31 Anode
4th 107 13 Anode
4th 10 13 Anode
4th 12 13 Anode

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Kapton tape
2025/08/25
The tape's current location is between 1st layer shield wires' feedthrough (col:2~5, Row:46) and Mylar just behind the wall on the short side.
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EDC Frame Reassemble
The handle section that's lifted by the crane cannot be tightened with a bolt . The screw hole (just one hole) is likely damaged.
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Low Voltage Test
From the CAEN Mod SY403 (ch2), apply V_set; 1V, I_set 1 uA to field wire.
Results: The anode wire was grounded, and the field wire maintained a uniform voltage of 4.21V. The current value was 10nA or less.

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 #5

Updated by Jin Takahashi 1 day ago

Low Voltage Test
2025/09/02
From the CAEN Mod SY403 (ch2), apply V_set; 1V, I_set 1 uA (->current limit) to field wire.
Results:
CAEN Mod SY403 Monitored Value:V = 3.40V, I = 0.00 uA

I test all the field wires(UU' and VV').
The tester measured the potential difference between the ground and field wires(UU' and VV'), revealing a uniform 4.2 V applied.

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 #6

Updated by Jin Takahashi about 7 hours ago

Low Voltage Test
2025/09/03
From the CAEN Mod SY403 (ch2), apply V_set; 100 V , I_set 1 uA (->current limit) to field wire.
Results:
CAEN Mod SY403 Monitored Value:V = 102.8 V, I = 0.00 uA

To prevent tripping when current flows, apply 50 V and check the voltage near the repaired field wires (4th 7-11, 2nd 5-35, 2nd 7-30, 2nd 35-35, 2nd 35-36, 2nd 34-35).
All the wires were at 47V, just like the other wires.

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EDC Frame Reassemble
2025/09/03
All bolts were properly tightened.
---

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