1

MuTR/MuTrig Readiness for Run13

Itaru Nakagawa on Behalf of MuTrig/MuTr Group

2

MuTr Cross Talk StatusRecapacitation on South Station-1 Gap-2&3Anode Terminator Installation to South Station-2 Clamp Installation To South Oct-1,2,3,4Anode Terminator Installation to North Station-2Clamp Installation to North Oct-1,2,3,4 in Oct 1 -20

Station-2 terminators

Region installed cramp last year

3

Cause of MuTr HV Trip

HV

GND

Spark

HV (1800 V)

1 MW

1 MW

100 pF

Anode Wire

Dry Air Cover

Often the case, HV trip is caused by unwanted ground path at the capacitor or its footprint. Installing dry air cover on top of clamp to prevent moisture.

Spark

4

Issues : Fragile Dry Air Tube Joints

The glue gets ripped off from the cover if the tube is under stress for a while.Need to supplement the glue.

Silicon glue to give someflexibility for installation.

5

Solution

• Add more glue on it to gain extra binding strength.

• Tested 3 different glues at test bench though, couldn’t get to the point of optimization. We ran out of time.

6

More Issues

• Insufficient Dry Air Flow – The present dry air flow is not enough. – Carter will upgrade the flow meters with the one

has larger maximum flow rate.

7

Muon Trigger Status

Replaced 4 Masked ADTX boards with spares These bad boards are not spitting out errors now,

thus can not be able to reproduce the problem. Replaced with spares however. Performance Check with Calibration Pulse and OK.

South Station-1 miscabling/function test will be carried out soon.

2~3 ADTX Boards needs to be replaced in North

8

BACKUPS

9

Muon Trigger Status Replaced 4 Masked ADTX boards with spares

These bad boards are not spitting out errors now, thus can not be able to reproduce the problem.

Replaced with spares however. Performance Check with Calibration Pulse and OK. South Station-1 miscabling/function test will be carried out soon.

Fix Bad HV Channels (St-2, St-3) Decap in St-2, Oct-7 Dry air cover in a couple of St-3 channels

Fix Detached Dry Air Tube Joints Installed Last Year Fixed Unstable OASys Camera Glue Mount