recap clamp for mutr station-3 itaru nakagawa for the phenix muon trigger upgrade collaboration...

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Recap Clamp for MuTr Station-3

Itaru NakagawaFor the PHENIX Muon Trigger

Upgrade CollaborationEspecially credit to:Tsutomu Mibe (KEK)Yoshinori Fukao (RIKEN)Yoshimitsu Imazu (RIKEN)Kentaro Watanabe (Rikkyo)

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MuTr Cross Talk

HV (1800 V)

1 MWAnode wire

1 MW

100 pF ....

Cathode strips (96 strip)

~0.1 pF/strip

Rise time of anode signal ~ 10 nsec

Removed to reduce HV trips

Anode Readout

100mV

3V

Serious Issue for Big Pulse

Pointed out by Tsutomu Mibe@KEK

Decap

Doesn’t exist.

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SolutionHV (1800 V)

1 MWAnode wire

100 pF ....

Cathode strips (96 strip)

~0.1 pF/strip

Rise time of anode signal ~ 10 nsec

R<<1M W1 MW

Additional Circuit to let anode current escape to ground.

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Pads for surface mount capacitorsLeft over Solder + Coating

To Anode Wire

MuTr Station-3 Anode Card

Capacitor (Removed)

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North Station-3 Anode Gap

25mm28mm

Geometrical Constraint

Anode cards are only accessible from their back. Front pattern can only be visible using an inspection mirror.

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Mounting A Clamp on Anode Card

Probe

Gap-1 Station-3 Anode Card

Screw

Station-3 Chamber

Capacitor

Pad

Gap-2 Station-3 Anode Card

28mm

MuID SideIP side

Anode card

Clamp

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Recap Clamp Prototypes

半田の残りかす(C) ShinEtsu Rubber Co.： EC-BM300 (2.5Wcm)

(A) 4 pin probes

(B) single pin probe

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Advantage/Disadvantage of Different Prototypes

Advantage

Disadvantage

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Effect of Recap

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Test Bench Setup

90Sr Source

Anode wire

Strip

#22

w/ and w/o Clamp

11

Comparison w/ .vs w/o Terminator

22

27

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Trigger

w/o Clamp

Strip#

22

27

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w/ Clamp w/ Clamp

Trigger

w/o Clamp

Comparison w/ .vs w/o Clamp

w/o Clamp

With Clamp

Strip Number

Aver

age

ADC

[cha

nnel

]Conductive Rubber

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Towards Successful Installation

14Fiber Scope

Alignment

Spacer determines Transversedirection within ~ 300mm.

Possible misalignment can be found by visual inspection using a fiber scope

Fiber scope shot

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Electrical Contact

Readout socket

Readout BoardElectrical Contact will be confirmedby measuring Voltage using temporaryreadout tool.

To be removed after the measurement.

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Clamp Coating Max Current Average Current

w/o w/ <1uA <1uA

w/ w/o >100uA Tripped after 2 min.

w/ w/ 1uA 1uA

w/ w/o >100uA Tripped after 1min.

w/ w/ 2uA 2uA

Extreme Breathing TestHV=1900VDuration 2min

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Installation Proposal

To be installed North Bottom Octants

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Summary

• We have developed prototype clamps for re-capacitation to MuTr St-3.

• Good Contact was established more than 90% channels with present design in North MuTr.

• We propose to install 3 different prototypes (each 20) to North bottom Octants for Run11.

• They can be uninstalled during Run if they cause trouble in HV operation.

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Backup Slides

20

ADC

MIP

MIP

Event Display of ADC Distribution　

Strip

Gap 1Stereo

Gap 2Stereo

Gap 3Stereo

Gap 1NonStereo

Gap 2NonStereo

Gap 3NonStereo