1

MuTr Recapacitation

RIKEN/RBRCItaru Nakagawa中川格

2

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

4

~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

5

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！

6

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

7

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

8

Recapacitation (Station-2)terminator

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

terminator

9

Recapacitation (Station-3)

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

10

Installation Constraint

11

North Station-3 Anode Gap

12

North Station-3 Anode Gap

50mm

13

North Station-3 Anode Gap

25mm28mm

Cross section drawing

14

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

15

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

16

History of R&DSpring

Sprint Probe

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

NG

Possibly penetrate coating

Good

17

St-1 Recapacitation Clip Prototype

Delivered in mid. February. To be tested shortly.

18

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.

19

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

20

History of R&D

Register<6mW

Thickness is limitted<500um

21

History of R&D

Flammability Registance

Fuji Rubber UL94-V2 ２〜３W

Shin’Etsu Rubber UL94-V0 １００〜４００W

22

Recap Effect

23

Test Bench Setup

90Sr Source

Anode wire

Cathode Strip #

22

24

Oscillo Snap Shot (w/o Recap)

22

27

17

10 sec accumulation time

Trigger

Source @ 21 ~ 22Strip#

No Recap

25

With Recap

22

27

17

10 sec accumulation time

Trigger

Source @ 21 ~ 22

With Recap

26

10 sec accumulation time

Trigger

Strip#27 Strip#25

Strip#20 Strip#19

Source @ 21 ~ 22 w/o recap averaged pulse

27

Trigger

Strip#27 Strip#25

Strip#20 Strip#19

Source @ 21 ~ 22 w/ recap averaged pulse

28

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

30

Comparison w/ .vs w/o Recap

Folk Type

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

31

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

32

Future ScheduleStation-3Anode gap mockup

Optimize UtilitiesFor Installation

Install folk/rubber prototypes partiallyIn North Station-3

Full Installaiton afterRun11

33

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

34

Back Up Slides

35

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

Between

Anode &

adjacent card (cha

mber)

Between

Gaps

~12mm

25mm

20mm

28mm

36

Removing Palyrene Coating

We may need to give up removing palyreneCoating.

37

Conductive Rubber Type

38

39

PHENIX　 HV治具検討（鍬型）

mutr_strip_event000270_clk2336100156q

Hit distribution (200 GeV, zerosup OFF)

40

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

41

Pede

stal

– A

DC(

3)Hit distribution (200 GeV, zerosup OFF)

Strip

Gap 1Stereo

Gap 2Stereo

Gap 3Stereo

Gap 1NonStereo

Gap 2NonStereo

Gap 3NonStereo

42

Current readout diagram

43

Dumping to GND with C (100pF)

44

Re-capacitation ?

decapacitation

Re-capacitation