study of the central tracker for huge detector at the linear collider takashi watanabe kogakuin...
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Study of the Central Trackerfor Huge Detectorat the Linear Collider
Takashi WatanabeKogakuin University
The 7th ACFA Workshopon Physics & Detector at the Linear Collider
9-12 November 2004, Taipei, Taiwan
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Contents
Physics RequirementsTPC study with MPI TPC (MWPC)
Beam test w/o Magnetic FieldCosmic-ray test w/o Magnetic Field
GEM performanceSummary
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Europe/Asia TPC collaboration Europe
MPI DESY IPN Orsay
Asia Chiba University KEK
Kinki University Kogakuin University Mindanao State Univeristy Saga University Tokyo University of Agricultur
e and Technorogy University of Tokyo University of Tsukuba
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Conclusions of Last workshopMost of R&D questions in Proof of
Principle phase have been answered affirmatively. This means that original R&D goals are basically achieved.
Next phase is engineering design, which requires a full scale prototype test.
orWe will seek for other possibilities .(e.g. TPC)
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Present Situation ITRP recommends “Cold” Technology
(August, 2004)Basically, requirements for Huge
detector from physics are almost same.
Requirement for Main Tracker
Good recoil mass resolutionGood jet invariant mass resolutionTime stamping
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Recoil Mass Resolution
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Jet Invariant Mass Resolution
Good track-cluster matchingz 1mm
2-track separationbetter than 2mm
< 10% hit loss at inner most layer for 250GeV W’s
not mentioned in this talk
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Time Stamping CapabilityTESLA NLC
Repetition rate 5Hz 120Hz
Bunches per train 2820 192
Bunch separation 337ns 1.4ns
Train-length 950s 260ns
Train separation 199ms 8.3ms
TESLA NLC
Repetition rate 5Hz 120Hz
Bunches per train 2820 192
Bunch separation 337ns 1.4ns
Train-length 950s 260ns
Train separation 199ms 8.3ms
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Present Situation ITRP recommends “Cold” Technology
(August, 2004)Basically, requirements for Huge
detector from physics are almost same.
Requirement for Main Tracker
Good recoil mass resolutionGood jet invariant mass resolutionTime stamping
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Position Resolution
TPC with micro pattern readout
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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TPC R&D item
Dispersion of charge cloud strongly depends on B-fields & drift length
Beam test with Magnetic field
MPGD sensor must provide better performance than wires do,
but…We should define base line sensor for TPC using MWPC (for fallback option?)
2mm spacing with 1mm gap to cathodesExB effect should be smallerLocalize induced charge distribution on pads
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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JACCEE magnet (for BESS-II)
No Return Yoke B = 1~1.2T @ center
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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PS beam line @ KEK PS
East Counter Hall
E391a experiment
(KL →0)
2 line0.6-4GeV/c
p
about 20m
a few percent effect of magnetic field
Magnet excitation was limited only one time
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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beam line
TPC in JACCEE magnet
Beam
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Detachable endplateMWPCMPGD (GEM, MEGAS)
2.00mm x 6.00mm readout pads32pads x 12 rows
7padrows equipped2mm anode-wire spacing
Small wire angular (ExB) effectMaximal drift length: 270mm1atm Ar:CH4:CO2 (93:5:2) TDR gas
Vdrift = 45mm/s (Edrift=200V/cm)
MPI TPC
Field Cage (Vcathod=6kV)
wire
chargepad
1mm
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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JACCEE magnet
No Return Yoke B = 1~1.2T @ center
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Electronics
ALEPH based readout electronicsFASTBUS FADC: 80ns time slotPre-amplifier: 500ns shaping time
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Typical Event
B = 1Tp = 4GeV/c = 20deg
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Pad Response Function
Xpad-Xtrack (mm)
Normalized Qi1
0
Slice on x axis obtain the mean fit themWith Gaussian to get width
B = 0TAlong z every 10mm
by Kijima
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Parameterization of PRF
consistent
by Kijima
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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x as a function of drift distancepreliminary
not calibratednot corrected
Ne~25!?
by Ikematsu
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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x as a function of drift distance
CD~0.1mm/sqrt{cm} @ B=3T (D.Karlen’s Cal.&Mes.)
x ~ 280m @ 2000mm evenif geom=0m
Do calibration and correction Needs gas study Study why Ne is small (charge screening?)
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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z as a function of drift distancepreliminary
z<800m for all drift region
not calibratednot corrected
by Ikematsu
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Wire Angular (ExB) Eff.x as a function of track-wire angle w/ B-field 1T
by Ikematsu
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Next StepCosmic-ray test at the KEK Cryogenic
Center
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Cosmic-ray test @ the KEK CC
Superconducting magnetwith return yoke
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Next StepCosmic-ray test at the KEK Cryogenic
CenterMWPC (now suspended because of DAQ
problems)4 layers GEM (from December?)
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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GEM
bi-conical holes due to chemical etching( CERN, 3M ) Copper electrodes 5um thick Kapton insulator
CNS@Tokyo univ. + Fuchigami Micro Co. using Plasma etching -> straight holes
Need Comparison under realistic operation condition !!
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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CERN GEM & Fuchigami GEM
CERN GEM dark ring around hole
shows Kapton insulator
Fuchigami GEM straight hall
Photos by microscope
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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GEM readout
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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GEM beam testSame time with MPI-TPC w/ MWPCNo Magnetic FieldP-10 gas
Test Chamber
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Setup
23.5mm
1.5mm
1.5mm • VG-G = 2kV/cm
• VG-P = 3kV/cm
Drift region
GEM10M
10M VGEM
10,30,50M
1mm
Readout pads(same with MPI-TPC)
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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PRF of GEMElectrons from
track (around center of pad) went to only one pad
2mm is too
large?
Nor
mar
ized
Q
xpadxtrack
Pad Response Function
by Sakamoto
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Next StepCosmic-ray test at the KEK Cryogenic Center
MWPC (now suspended because of DAQ problems)
4 layers GEM (from December?)Beam test at the KEK-PS Counter Hall
(April/May, 2005?)4 layers GEMMEGAS
Cosmic-ray test with new readout(summer 2005?)
The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)
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Summary
We joined the world TPC club and studied the basic line using MPI-TPC w/ MWPC.
We have a lot of study items for TPC w/ MPGD (but we have no enough time).
We are always waiting your comments and joining to our group.