Wenxin wang d atti p colas e delagnes yuanning gao bitao hu bo li yulan li m riallot xiaodong zhang
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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)


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


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


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


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


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


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


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


Micromegas Modules for TPC

2 Resistive Kapton

~3 MΩ/□

Resistive Kapton

~5 MΩ/□

Standard

Resistive ink

~3 MΩ/□

W. Wang - FCPPL workshop


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


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


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


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 Results

PRF(Pad ResponseFunctions) fits, z ~ 5 cm

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

W. Wang - FCPPL workshop


Data Analysis Results

Position residuals xrow-xtrack

W. Wang - FCPPL workshop


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


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


ILC-TPC

1.2 Tsinghua GEM-TPC (TU-TPC)

W. Wang - FCPPL workshop


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


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


Fast Neutron

Imaging Micromegas Detector

W. Wang - FCPPL workshop


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


Fast Neutron Imaging Micromegas Detector

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

W. Wang - FCPPL workshop


Fast Neutron Imaging Micromegas Detector

PCB design for fast neutron detector

( six T2K front end cards

~2000 pixels

1.5mm )

W. Wang - FCPPL workshop


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


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


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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