mutr recapacitation riken/rbrc itaru nakagawa 中川格 1

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MuTr Recapacitation

RIKEN/RBRCItaru Nakagawa中川格

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MuTr Cross Talk

HV (1800 V)

1 MWAnode wire

1 MW

100 pF ....

Cathode strips (96 strip)

Rise time of anode signal ~ 10 nsec

Removed to reduce HV trips

Anode Readout

100mV

3V

€

3V

#of Strips?

mutr_strip_event000980_clk2424488954q

3

Pede

stal

– A

DC(

3)

MIP

MIP

Hit distribution (200 GeV, zerosup OFF)

Strip

Gap 1Stereo

Gap 2Stereo

Gap 3Stereo

Gap 1NonStereo

Gap 2NonStereo

Gap 3NonStereo

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~15BCLK

12〜 13BCLK

ミューオントリガーヒットレート

ビームクロック

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放置できない理由

x2 (Run 11?) x5 (design)

Current set up

Recap (1/10? cross talk)

Luminosity

Rate

per

strip

(kH

z)

Recapacitation + Neutron Absorber + Shaper Tune 　

Run 9, 500 GeV data

10ms 100kHzでパイルアップ！

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Anode circuit diagram after recap+termination

HV (1800 V)

1 MWAnode wire

100 pF ....

Cathode strips (96 strip)

~0.1 pF/strip

Rise time of anode signal ~ 10 nsec

Cathode impedance = 1/wC Z(cathode) = 1/(100 M Hz/ 2 pi * 0.1 pF) = 6 kW @10 nsec

Z(bypass) = 6 W << Z(cathode)

R<<1M W1 MW

Recap

Terminator

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All capacitors are removed. New capacitors will be soldered and attach terminators to ground.

Recapacitation (Station-1)terminator

capacitors

2010: Gap-12011?: Take Station-1Chamber out, and solder

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Recapacitation (Station-2)terminator

Capacitors are remaining. So new terminal cardsto be mounted to the anode readout connector.

terminator

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Recapacitation (Station-3)

All Capacitors had removed. It is very difficult to take outStation-3 chamber. Thus “clamp type” recap-board is under development.

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Installation Constraint

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North Station-3 Anode Gap

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North Station-3 Anode Gap

50mm

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North Station-3 Anode Gap

25mm28mm

Cross section drawing

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Surface Coating

Anode CardParylene CPrint Kote

remover

Takes time, but eventually comes off

Will melt with chloronaphthalene at 175 degrees (more than 1 hour).

Practically impossible

Perhaps parylene coating may be partially comes off when De-Capacitation was attempted

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Clamp Conceptual Design

Probe

Gap-1 Station-3 Anode Card

Clip holder

Station-3 Chamber

Capacitor

Pad

Gap-2 Station-3 Anode Card

28mm

MuID SideInstall side

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History of R&DSpring

Sprint Probe

•Probe Length > ~few cm•Max Current < 3A•Spring is not too strong

NG

Possibly penetrate coating

Good

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St-1 Recapacitation Clip Prototype

Delivered in mid. February. To be tested shortly.

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History of R&D

Force crown to contact with padG10 G10

Due to the warp, crown probe contact on pad with only single point.

warp=300um

Looses it’s contact if adjacent pad have left

over solder.

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History of R&D

Absorb any surface structure ofpads by separating each channelswith slit

Confirmed good contact even strips right next to thechannel where 800um high left over solder is

Left over solder

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History of R&D

Register<6mW

Thickness is limitted<500um

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History of R&D

Flammability Registance

Fuji Rubber UL94-V2 ２〜３W

Shin’Etsu Rubber UL94-V0 １００〜４００W

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Recap Effect

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Test Bench Setup

90Sr Source

Anode wire

Cathode Strip #

22

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Oscillo Snap Shot (w/o Recap)

22

27

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10 sec accumulation time

Trigger

Source @ 21 ~ 22Strip#

No Recap

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With Recap

22

27

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10 sec accumulation time

Trigger

Source @ 21 ~ 22

With Recap

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10 sec accumulation time

Trigger

Strip#27 Strip#25

Strip#20 Strip#19

Source @ 21 ~ 22 w/o recap averaged pulse

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Trigger

Strip#27 Strip#25

Strip#20 Strip#19

Source @ 21 ~ 22 w/ recap averaged pulse

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Measurement w/ DAQ

ADC>1000ch

…,13,14 31,32,……21,22,23…

90Sr Source

Strip Number

Strip Number

Strip NumberAD

C [c

hann

el]

ADC

[cha

nnel

]

Not sharingAnode wire

Not SharingAnode wire

Strips below source

Comparison w/ vs. w/o Recap

w/o Recap

w/ Recap

Strip Number

平均

ADC

[cha

nnel

]

Conductive Rubber

29

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Comparison w/ .vs w/o Recap

Folk Type

Similar effect can be achieved as long as good contact is secured.

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Some Open Questions

1. Asymmetric ADC btwn left and right side of central strip

2. Enhanced Effect of Cross talk towards the last strip of anode wire

3. Peak Strip > Sxtalkstrip

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Future ScheduleStation-3Anode gap mockup

Optimize UtilitiesFor Installation

Install folk/rubber prototypes partiallyIn North Station-3

Full Installaiton afterRun11

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Short Term Schedule

• End July : Station-3 Gap Mock Up Delivery• Beg Aug : Different Capacitor/Resistance

Combination (10pF, 56pF, 100pF, 1000pF, 0W, 360W, 1MW)

• Mid Aug : Station-3 Anode Card & Clamp Delivery

• Sept : Station-3 Clamp optimization• Oct : Prototype Production • Nov : Prototype Installation to N.Station-3

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Back Up Slides

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Station-1 vs. Station-3Station-1 Station-3

Between

Anode &

adjacent card (cha

mber)

Between

Gaps

~12mm

25mm

20mm

28mm

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Removing Palyrene Coating

We may need to give up removing palyreneCoating.

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Conductive Rubber Type

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PHENIX　 HV治具検討（鍬型）

mutr_strip_event000270_clk2336100156q

Hit distribution (200 GeV, zerosup OFF)

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Strip

Pede

stal

– A

DC(

3)

South arm, Station 1, Octant 1

Gap 1Stereo

Gap 2Stereo

Gap 3Stereo

Gap 1NonStereo

Gap 2NonStereo

Gap 3NonStereo

mutr_strip_event000978_clk2424488676q

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Pede

stal

– A

DC(

3)Hit distribution (200 GeV, zerosup OFF)

Strip

Gap 1Stereo

Gap 2Stereo

Gap 3Stereo

Gap 1NonStereo

Gap 2NonStereo

Gap 3NonStereo

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Current readout diagram

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Dumping to GND with C (100pF)

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Re-capacitation ?

decapacitation

Re-capacitation