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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