T. Lux. 13/12/2012 2 Charged particles X-ray (UV) Photons Cathode Anode Amplification Provides: xy...
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Transcript of T. Lux. 13/12/2012 2 Charged particles X-ray (UV) Photons Cathode Anode Amplification Provides: xy...
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Gas Detector R&D at IFAE
T. Lux
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Gas Detector Principle
13/12/2012
Charged particles
X-ray(UV) Photons
Cathode
Anode
Amplification
Provides:• xy position• Energy• (z position)
e-e-
e-
CsI coating
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Right gas choice and pressure fundamental!Normally: noble gas + quencher gas
Choice depends on: Tracking, photon detection or spectroscopy? Fast gas necessary? (still slower than solid state detectors) Is a high gain required? High rate environment? Is ageing an issue? Safety! Better if not flamable! Sensitive to impurities? Diffusion? -> affects point resolution Complication of the gas system? (open or closed for example) Price!
Gas Choice
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Argon, xenon or …?
Which noble gas?
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Stopping power larger in Xenon Better energy resolution in Xenon Argon much cheaper Etc.
pressure
ß but …• pressure vessel + gas
system• attachment • charge gain • voltages
• …
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Infinite possibilities: CH4, CO2, C4H10, CF4, DME, …
Which quencher gas?
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Several advantages about the classical wire readout:
Excellent spatial resolution ( amplification structures: ~100 m) Very good energy resolution Low material budget No ExB effects Cheap Can be produced in large quantities
Micro Pattern Gas Detectors
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GEM
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1 stage amplification Excellent energy resolution and low threshold (600 eV) Time resolutions below 1 ns possible
MicroMegas (MM)
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Amplification within holes of Kapton foil coated with copper Normally operated in cascades -> better stability Can be operated in high rate environments (LHCb: 1
MHz/cm2)
Gas Electron Multiplier (GEM)
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2005: Start R&D efforts for a MPGD TPC for T2KEuropean GEM collaboration: UniGe, IFIC, INFN Bari, IFAE
T2K: MPGD Detector R&D
13/12/2012Thorsten Lux (IFAE/UAB) 9/19
• 2 GEM tower• 3 GEM each• ~20x24 cm2• also small setup at IFAE
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T2K: MPGD Detector R&D
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T2K: MPGD Detector R&D
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• IFAE participated in setting up testbench• characterization of ~ 90 MM modules• ~12 m2 readout area• nowadays focus on analysis
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Electroluminescence (EL)
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between two parallel meshes (G1,G2) a voltage is applied operated below the point where charge amplification sets in linear production of light (~172 nm for Xe) -> better energy
resolution light is read out by PMT/APD/MPPC/… gain of 1000-2000 photons per e- at 10 bar possible
G1
G2
Sensors
e-Drift region
EL gap
Cathode
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EL Detector R&D
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Started for a DB experiment in 2005 First stage: small HP chamber with 5 APDs Allowed to develop readout electronics Excellent energy resolution achieved Low threshold possible
(8.2 ± 0.1)% FWHM
xenon
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EL Detector R&D
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Larger chamber with 25 APDs Pressure up-to 5 bar Focus on tracking
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IEEE 2012 Anaheim 15
EL Detector R&D
2/11/2012
Very primitive cluster finder still
Using the cosmic ray trigger
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Optimal imaging: MPGD with Pixel readout New project with CNM will start in January Si-MPGD coupled to MediPix chip
Future Project: Si-MPGD R&D
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MIPs
δ-ray!14 mm
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Choice of gas and pressure allows wide range of application Energy measurement: 0.6 keV – 100+ keV X-rays (with
decreasing detection efficiency for higher energies)
Photon counting at lower energies with coating Point resolutions down to 100-200 m possible Time resolutions below 1 ns possible High radiation hardness Count rates of 1 MHz/cm2 possible MPGD allow to cover large areas to reasonable costs
Gas detector knowledge available at IFAE but a gas detector for a ESRF source would require a dedicated R&D program
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Summary
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Backup Slides
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G.C. Smith, Gas-based detectors for synchrotron radiation, Journal of Synchrotron Radiation, Vol. 13, page 172-179, 2006
J.E. Bateman et al., A gas microstrip wide angle X-ray detector for application in synchrotron radiation experiments, NIM A, Volume 477, Issues 1–3, 21 January 2002, Pages 340-346
M. Kocsis et al., A novel gas-filled detector for synchrotron radiation applications, NIM A, Volume 563, Issue 1, 1 July 2006, Pages 172-176
M. Kocsis, The status of gas-filled detector developments at a third generation synchrotron source (ESRF), NIM A, Volume 471, Issues 1–2, 21 September 2001, Pages 103-108
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Literature
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The neutrino group at IFAE has built up in the last 7 years a significant amount gas detector knowledge:
2005-2008: MPGD R&D for the T2K TPCs 2008-2012: Electroluminescence detector R&D
Future projects at IFAE: 2013-2015: Development of a Si-MPGD with
MediPix readout
History at IFAE
13/12/2012