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Large TPCs for HEP ILC-TPC & Fast Neutron detector. Wenxin Wang (D. Attié , P. Colas, E. Delagnes , Yuanning Gao, Bitao Hu, Bo Li, Yulan Li, M. Riallot , Xiaodong Zhang). Self-Introduction. Came from Lanzhou University PhD thesis in Orsay University

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wenxin wang d atti p colas e delagnes yuanning gao bitao hu bo li yulan li m riallot xiaodong zhang
Large TPCs for HEP ILC-TPC & Fast Neutron detector

Wenxin Wang

(D. Attié, P. Colas, E. Delagnes, Yuanning Gao, Bitao Hu, Bo Li, Yulan Li, M. Riallot, Xiaodong Zhang)

slide2
Self-Introduction

Came from Lanzhou University

PhD thesis in Orsay University

Work in RD51 (advisor P. Colas)

“Study of large Micromegas detectors for calorimetry and muon detection”

1.2×0.4m2Micromegas prototype

Micromegas Digital HCAL

W. Wang - FCPPL workshop

slide3
Outline
  • ILC-TPC
  • 1.1 Micromegas ILC-TPC:
  • ILC-TPC Large Prototype
  • Bulk Micromegas with resistive anodes
  • T2K electronics
  • Data analysis results
    • 1.2 Tsinghua GEM-TPC improvement (TU-TPC)
  • Fast Neutron Imaging Micromegas Detector

W. Wang - FCPPL workshop

ilc tpc 1 1 micromegas ilc tpc

ILC-TPC1.1 Micromegas ILC-TPC

W. Wang - FCPPL workshop

slide5
Micromegas

Y. Giomataris,

Ph. Rebourgeard,

JP Robert

and G. Charpak,

NIM A 376 (1996) 29

MICROMEshGAseous Structure

Edrift / Eamplif ~ 1/200

  • metallic micromesh (typical pitch 50μm)
  • sustained by 50-100 μm pillars
  • Spatial resolution (<100μm)
  • Time resolution (few ns)
  • High-rate capability
  • Good robustness

cathode

Amplification gap

~50-100 µm ~50 kV/cm

Drift gap

~0.3 kV/cm

W. Wang - FCPPL workshop

slide6
Micromegas TPC: Time Projection Chamber
  • Ionization energy loss(dE/dx)
  • 3D track points reconstruction

t

electrons diffuse and drift due to the E-field

Ionizing Particle

electrons are separated from ions

E

B

A magnetic field reduces electron diffusion

y

x

Micromegas TPC : the amplification is made by Micromegas

Localization in time and position

W. Wang - FCPPL workshop

slide7
ILC-TPC Large Prototype

Design for an ILD TPC in progress

2x80 modules with 8000 pads each

Goal:

O(200) track points

transverse resolution : 100 μm

(2 m drift & 3.5 T magnet)

.

W. Wang - FCPPL workshop

slide8
ILC-TPC Large Prototype
  • Built by the collaboration
  • Financed by EUDET
  • Located at DESY:5GeV e- beam
  • Sharing:
  • - magnet : KEK, Japan
  • - field cage : DESY, Germany
  • - Cosmic trigger : Saclay, France
  • - endplate : Cornell, USA
  • Testing:
  • - Micromegas : Saclay, France,
  • Carleton/Montreal, Canada
  • - GEM : Saga, Japan,
  • Tsinghua, China
  • - TimePix pixel : F, D, NL

TPC

ILD

W. Wang - FCPPL workshop

slide9
Micromegas with Resistive Anode

Pad width limits MPGD TPC resolution

: pad width

0 : resolution at Z=0 without diffusion

resistive foil

glue

pads

mesh

mesh

B

E

B

E

pads

Charge dispersion technique with a resistive anode so that wide pads can be used for centroid determination

Direct signal readout technique

A centroid calculation less precise

W. Wang - FCPPL workshop

slide10
Micromegas Modules for TPC

2 Resistive Kapton

~3 MΩ/□

Resistive Kapton

~5 MΩ/□

Standard

Resistive ink

~3 MΩ/□

W. Wang - FCPPL workshop

slide11
T2K Electronics Characteristics
  • frequency tunable from 1 to 100 MHz (most data at 25 MHz)
  • 12 bit ADC (rms pedestals 4 to 6 channels)
  • pulser for calibration
  • AFTER-based electronics (72 channels/chip) from T2K experiment:
    • low-noise (700 e-) pre-amplifier-shaper
    • 100 ns to 2 μs tunable peaking time
    • Zero Suppression capability
    • full wave sampling by SCA
  • Bulk Micromegas detector: 1726 (24x72) pads of ~3x7 mm²

W. Wang - FCPPL workshop

slide12
T2K Electronics

NEW ELECTRONICS – FLAT ON THE BACK OF THE MODULE

Goal : Fully equip 7 modules with more integrated electronics, still based on the T2K AFTER chip.

First prototype in June 2010

Tests at fall 2010

Then production and characterization of 9 modules in 2011 at the CERN T2K clean room

W. Wang - FCPPL workshop

slide13
Data Analysis Results

W. Wang - FCPPL workshop

b 0 data drift velocity measurements
B=0 data : Drift velocity measurements

Data Analysis Results

Drift Velocity in T2K gas compared to Magboltz simulations for

- P=1035 hPa

- T=19°C

- 35 ppm H20

( T2K gas: Ar:CF4:iso=95:3:2)

Vdrift = 7.698 +- 0.040 cm/µs at E=230 V/cm

(Magboltz : 7.583+-0.025(gas comp.))

The difference is 1.5+-0.6 %

W. Wang - FCPPL workshop

slide15
Data Analysis Results
  • PRF : Pad Response Function
  • a measure of signal size as a function of track position
  • relative to the pad
  • using pulse shape information to optimize the PRF
  • The PRF:
  • is not Gaussian.
  • can be characterized by its FWHM (z) & base Width (z).

W. Wang - FCPPL workshop

prf pad response functions fits z 5 cm
Data Analysis ResultsPRF(Pad ResponseFunctions) fits, z ~ 5 cm

B=1T data : comparison of resistive ink and Carbon-loaded Kapton

W. Wang - FCPPL workshop

slide17
Data Analysis Results

Position residuals xrow-xtrack

W. Wang - FCPPL workshop

slide18
Data Analysis Results
  • MEAN RESIDUAL vs ROW number
  • Z-independent distortions
  • Distortions up to 50 microns
  • for resistive paint
  • Rms 7 microns for CLK film

Z=5cm

Z=35cm

Z=50cm

W. Wang - FCPPL workshop

slide19
Data Analysis Results

Resistive CLK:

0 =52.7 μm

0 : the resolution at Z=0

Neff : the effective number of electrons

W. Wang - FCPPL workshop

dependence of resolution with data taking conditions
Dependence of resolution with data taking conditions

Data Analysis Results

Resolution at z=5cm (µm)

Vmesh (V)

W. Wang - FCPPL workshop

slide21
ILC-TPC

1.2 Tsinghua GEM-TPC (TU-TPC)

W. Wang - FCPPL workshop

slide22
Tsinghua GEM-TPC (TU-TPC)

Small TU-TPC prototype (GEM-TPC)

Total: 99 strips

Pitch: 5 mm

Strip Width: 2 mm

Maximum drift length: 50cm

Readout detector: triple-GEM

Scheme of TU-TPC prototype

W. Wang - FCPPL workshop

slide23
Tsinghua GEM-TPC Improvement
  • Improvement @ TU-TPC
    • Field cage: single-side strip
    • to mirror strip: done
    • Guard ring: adopted
    • DAQ: from Q, T separately,
    • to pulse sampling, delayed,
    • but coming soon
    • Space charge calculation

W. Wang - FCPPL workshop

slide24
Fast Neutron

Imaging Micromegas Detector

W. Wang - FCPPL workshop

slide25
Fast Neutron Imaging Micromegas Detector

The typical conversion reactions:

H(n,n)p 10B(n,α)7Li 6Li(n,α)t

α

n → t

p

Scheme of the gadolinium foil (100 μm) etching and image obtained with the Micromegas detector.

F. Jeanneau et al. IEEE Transactions on Nuclear Science, vol. 53, issue 2, pp. 595-600

W. Wang - FCPPL workshop

slide26
Fast Neutron Imaging Micromegas Detector

Readout electronics using AFTER-based electronics (made by Saclay)

W. Wang - FCPPL workshop

slide27
Fast Neutron Imaging Micromegas Detector

PCB design for fast neutron detector

( six T2K front end cards

~2000 pixels

1.5mm )

W. Wang - FCPPL workshop

slide28
Fast Neutron Imaging Micromegas Detector
  • Present - August 2010: Design, construction, transportation and assembly of fast neutron detector;
  • September 2010: Date taking with fast neutron detector using a 14MeV neutron beam in Lanzhou University.

W. Wang - FCPPL workshop

slide29
Conclusions

Micromegas ILC-TPC:

  • Since December 2008 , 5 modules of Micromegas TPC have been measured and got good results. The concept isgloballyvalidated.
  • Next stepwelladvanced : 7 modules to fullyequip the presentendplate.

Fast Neutron Imaging Micromegas Detector:

We have finished the basic design of fast neutron Micromegas detector and will take data in this year. All these make good preparation for research of neutron imaging.

W. Wang - FCPPL workshop

slide30
Thank you for your attention

And

Thanks to all others for the texts and pictures I “borrowed”

W. Wang - FCPPL workshop

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