THGEMs: very recent results towards applications in DHCAL & LXe detector readout Weizmann: A. Breskin, R. Chechik, R. Budnik, CERN: V. Peskov Coimbra &

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THGEMs: very recent results towards applications in DHCAL & LXe detector readout Weizmann: A. Breskin, R. Chechik, R. Budnik, CERN: V. Peskov Coimbra & Aveiro: J. Veloso, C. Azevedo, J. dos Santos, H. Natal da Luz, H. Natal da Luz, A. Coimbra Nantes: S. Duval, D. Thers UTA: A. White, S. Park Work within CERN-RD51 Marco Cortesi Weizmann Institute of Science THGEM Recent works: Review NIM A 598 (2009) JINST 5 P JINST 4 P08001

Thick Gas Electron Multiplier (THGEM) SIMPLE, ROBUST, LARGE-AREA Printed-circuit technology  Intensive R&D  Many applications: - THGEM/CsI UV detectors for RICH - Neutron imaging - Charge sensors for DCAL - Cryo detectors for Dark Matter 1 e - in e - s out ~40kV/cm THGEM Double-THGEM: higher gains ~ 10-fold expanded GEM Weizmann Inst. Effective single-electron detection Few-ns RMS time resolution (MIPs/UV) Sub-mm position resolution MHz/mm 2 rate capability Cryogenic operation: OK Gas: molecular and noble gases Pressure: 1mbar - few bar Magnetic fields: OK Thickness 0.5-1mm small rim prevents discharges Weizmann Inst.

 Comparatively low operation voltages reduced discharge probability, discharge energy and charging-up effects  High gains, even with single-THGEM lower detector thickness (Important for DHCAL)  High single-photoelectron gains even in the presence of ionizing background (higher dynamic range compared to Ar-mixtures) Ne-based mixtures Weizmann Inst.

Gain: Single/Double THGEM in Ne-mixtures Very high gain in Ne and Ne mixtures, even with X-rays At very low voltages !! X-rays: 2-THGEM 100% Ne: Gain 10 ~300V UV: 1-THGEM Ne/CF 4 (10%): Gain > 10 ~800V 10 6 Double-THGEM 9 keV X-rays Single-THGEM CsI PC + UV-light (180 nm) JINST 4 P08001 Weizmann Inst.

DHCAL applications Weizmann Inst.

THGEM-based DHCAL THGEM: sampling elements in Digital Hadron ILC Digital Hadron Calorimetry: Different concepts proposed for the active sampling elements: GEM, RPC, Micromegas… THGEM: a new solution proposed by Univ. Arlington (UTA) & Weizmann  Interlaced steel-plates and THGEM multipliers.  Simple, robust, thin, compact, stable, high gain SIMULATION Weizmann Inst.

May 2010: Chamber Prototype – test with X-rays E Hole E tran E Ind E Drift Ne-mixture Soft X-Ray THGEM1 THGEM2 10 mm 2 mm KPiX 8x8 anode pad layout 100x100mm 2 THGEM Thickness  0.4 mm Hole diam.  0.5 mm Pitch  1.0 mm Rim  0.1 mm Cathode More info about kpix-readout from A. White talk Weizmann Inst.

Gas Inlet Vacuum Pump Gas Outlet KPiX Interface & FPGA boards Pressure gauge KPiX Power supply HV derivation box Detector chamber THGEM Chamber Setup 2 Weizmann Inst.

THGEM + KPiX: Preliminary results 1 Double THGEM detector – Self Trigger operation Irradiation: 6keV non-collimated x-rays Tails due to charge sharing between neighbor pads NE/5%CH 4 Gain ~ 2x fold below max! Weizmann Inst.

THGEM + KPiX: Preliminary results 2 55 Fe X-rays (5.9 keV) COLLIMATED ~22% FWHM Ne/5%CH 4, operation Gain ~ 2x10 3 Max Gain ~ 10 5 Single-THGEM 55 Fe Gain ~ 2x10 3 Ne/5%CH 4 STABLE LONG-TERM OPERATION WITH 55 Fe Weizmann Inst.

DHCAL/THGEM: Future plans 1)Characterization and optimization of the small (10x10 cm 2 ) THGEM-based detector prototype with MIP (beta/cosmic rays) 2)Test beam with small (10x10 cm 2 ) THGEM-based detector prototype (CERN/FNAL) 3)Production of large (30x30 cm 2 ) THGEM electrodes (in cooperation with local industry) 4) Design and construction of large-THGEM based detector (30x30 cm 2 ; 33x100 cm 2 ) 5) Characterization and optimization of large-THGEM based detector in DHCAL (CALICE) Weizmann Inst.

Cryo-THGEM applications Weizmann Inst.

Noble-gas detectors WIMP Gas Liquid e- E Ar, Xe… Primary scintillation Secondary scintillation Electron multiplier &/or photomultiplier photomultiplier Charge &/or scintillation-light detection in liquid phase or Charge &/or scintillation-light detection In gas phase of noble liquids: “TWO-PHASE DETECTORS” Possible applications: Noble liquid ionization calorimeters Noble-Liquid TPCs (solar neutrinos) Two-phase detectors for Rare Events (WIMPs,  -decay, …) Noble-liquid  -camera for medical imaging Gamma astronomy Gamma inspection..... Use THGEM electron multipliers & THGEM/CsI photomultipliers ? Weizmann Inst.

XEMIS LXe Compton Camera LXe-TPC GPM  Tests in LXe: May Nantes cryostat Nantes/Weizmann Weizmann Inst.

Cryo-GPM for LXe Medical Compton Camera THGEM : thickness = 400  m hole Ø = 300  m hole spacing = 700  m rim size = 50  m  V THGEM 4 mm  V THGEM Double-THGEM layout MgF 2 UV window Reflective CsI photocathode Ne/CH 4 GPM location LXe TPC gamma-converter with field shaping Subatech-Nantes/Weizmann 44 Sc  +  emitter LXe Gamma Camera PET 2009 JINST 4 P12008 Weizmann Inst.

2-phase DM detectors XENON100Kg: running with PMTs! PROBLEM: cost & natural radioactivity of multi-ton detectors! Proposed design of XENON 1ton Possible design of the XENON 1 ton two-phase LXe DM TPC detector with ~ 121 QUPID vacuum photon detectors. Background: 1mBq/tube Expectation: < 1 WIMP interaction/Kg/Day Aprile/XENON WIMP interaction LXe e- THGEM/CsI GPM Primary scintillation EGEG ELEL Secondary scintillation Xe THGEM/CsI GPM UV-window Ne/CF4 ? RD51: Weizmann/Nantes/Coimbra THGEM-GPM (gas photomultiplier): Simple, flat (save LXe), robust Low-cost Can be made Radio-clean ? Lower thresholds ? QUPID HPD LXe Weizmann Inst.

Cryo-GPM with windows Cryo-GPM with windows 2-phase or liquid scintillators Best operation, confirmed at RT: Ne/CH 4 or Ne/CF 4 radiation LXe e- THGEM/CsI GPM EGEG Secondary scintillation Xe UV-window 10 6 GPM in noble-gas: gain affected by lack of impurities arXiv: arXiv: GPM w window: better control of counting gas / stability Higher gain & lower HV RT Weizmann Inst.

Double-THGEM/CsI at RT & CRYO-T Preliminary CRYO-T in “improvised“ setup at Weizmann Cryo-medium: LN 2 /ethanol Soon: studies at Nantes with LXe TPC Ne/5%CH 4 Preliminary results in Coimbra: at RT, similar 1-3 bar RT 185K 150K 10 5 Samuel Duval, Ran Budnik, Artur Coimbra & Marco Cortesi (WIS) Double-THGEM RT & CRYO-T May Effective Gain Weizmann Inst.

Cryo-THGEM : Future plan 1)Characterization and optimization of the small (3x3 cm 2 ) THGEM- based detector prototype in cryogenic conditions (LN 2 /ethanol; LXe) 2)Design and construction of a 100mm diameter GPM and tests in scintillation & double-phase detector modes (in double-phase: using XENON10 TPC) 3) R&D for design and production of radio-clean THGEM (Cirlex, Teflon, …) for Dark Matter 4) Characterization and optimization of THGEM-based pixilated GPM readout schemes. Weizmann Inst.

SUMMARY THGEM THGEM a versatile robust electron multiplier Good suitability for photon detection with Ne-mixtures -) Low voltage  Better stability, No demage induced by discharges -) High Gain, even with single THGEM  small detector thickness -) Larger dynamic range  Good stability in background enviroment Potential RT & low-T Sampling elements for Digital Hadron Calorimeters Cryogenic UV-photon detectors for medical imaging and dark matter UV-photon detectors for RICH Neutron-imaging detectors Large-area moderate-resolution tracking detectors Weizmann Inst.