MuTr Recapacitation RIKEN/RBRC Itaru Nakagawa 中川格 1.
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Transcript of MuTr Recapacitation RIKEN/RBRC Itaru Nakagawa 中川格 1.
![Page 1: MuTr Recapacitation RIKEN/RBRC Itaru Nakagawa 中川格 1.](https://reader033.fdocuments.net/reader033/viewer/2022061612/56649cff5503460f949d1428/html5/thumbnails/1.jpg)
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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?
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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
17
10 sec accumulation time
Trigger
Source @ 21 ~ 22Strip#
No Recap
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With Recap
22
27
17
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
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Comparison w/ vs. w/o Recap
w/o Recap
w/ Recap
Strip Number
平均
ADC
[cha
nnel
]
Conductive Rubber
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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)
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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
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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
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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