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Thick-GEM sampling element for DHCAL: First beam tests & more

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Presentation on theme: "Thick-GEM sampling element for DHCAL: First beam tests & more"— Presentation transcript:

1 Thick-GEM sampling element for DHCAL: First beam tests & more
Breskin, R. Chechik, M. Cortesi, L. Arazi, M. Pitt Weizmann Institute of Science – Israel (RD51) White, S. Park, J. Yu UTA – USA (RD51) J. Veloso, H. Natal da Luz, C. Azevedo, D. Cavita Aveiro & Coimbra Univ. – Portugal (RD51) M. Breidenbach, D. Freytag, G. Haller, R. Herbst SLAC - USA THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

2 Digital Hadron Calorimetry for ILC
ILC: Separate W,Z boson masses on event-by event basis 60%/E Best JET resolution with traditional calorimetry Precision studies of new physics Need 30%/E Generally need σ/Ejet ~3-4% Digital calorimetry associate “hits” with charged tracks, remove hits, measure neutrals in calorimeter using hits vs. energy Particle Flow Algorithms now achieve the required energy resolution! Requires thin, efficient, highly segmented, compact, robust medium, (competitors: D-GEM, Micromegas, RPC, THGEM) THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

3 New concept for DHCAL: THGEM
A. White et al UTA HCal UTA: 1m2 in process General detector scheme ~6.5mm 2 sampling layers (out of 40) with THGEM-based elements Sampling jets + advanced pattern recognition algorithms  Very high-precision jet energy measurement. Simulated event w 2 hadronic jets Reconstructed jet: Simulated energy resolution σ/Ejet ~ 3% (CALICE) THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

4 KPiX Analog Readout for GEM & THGEM DHCAL
Dynamic gain select (GEM/Si) Breidenbach et al. SLAC 13 bit A/D DHCAL anode pad Storage until end of train. Pipeline depth presently is 4 Leakage current subtraction New version equipped with self and ext. trigger Event triggered by the ILC clock calibration 1024 channel 13 bit ADC chip Developed for Si/W SLAC 4 THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010 4

5 D-GEM / 64 anode-pads + KPiX
Fe55 Source Signal 30x30 cm D-THGEM/KPiX Top side A. White et al UTA THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

6 D-GEM / kPiX with Cosmics - with Ext. Trigger
~18 fC Noise spectrum 6 THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

7 Thick Gas Electron Multiplier (THGEM)
~ 10-fold expanded GEM drilled THGEM 1e- in etched E e-s out Thickness 0.5-1mm Double-THGEM: higher gains THGEM advantage for DHCAL: SIMPLE, ROBUST, LARGE-AREA Cheap: Printed-circuit technology Digital counting gain fluctuations not important Robust, if discharge no damage Effective single-electron detection Few-ns RMS time resolution Sub-mm position resolution >MHz/mm2 rate capability Broad pressure range: 1mbar - few bar THGEM Recent review NIM A 598 (2009) 107 THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

8 Gain: THGEM in Ne-mixtures Gain: single UV-photons
2009 JINST 4 P08001 e- Segmented readout electrode THGEM MIP 10x10 cm2 THGEM Gain: single UV-photons 10x10cm Double-THGEM double-THGEM Single-THGEM High gain in Ne mixtures 2-THGEM: higher gains/lower HV But: low ionization (ntot~40 e/MIP) Ne/5%CH4 THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010 Cortesi Marco 8

9 CERN test-beam detector
4-pads electrode with Q-pamp/MCA 64 pads electrode with KPiX behind Installation at CERN THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

10 Muons w Double-THGEM KPIX or Q-preamp/MCA ~12 fC 0.4mm MIP e- 0.4mm
2-THGEM BEAM TESTS with Q-preamp/MCA 3.4 mm drift Here we had: 0.5mm holes / 1mm space 0.4mm MIP Double-THGEM, Ne/5%CH4; Average gain ~5000 e- 2-THGEM BEAM TESTS with KPIX 1x1 cm pad electrode ~12 fC THGEM 3.4 mm drift 0.4mm KPIX or Q-preamp/MCA August 2010 Double-THGEM, Ne/5%CH4; Average gain ~5300 THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

11 Double-THGEM & KPiX Muon beam profile
THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

12 Muons with double-THGEM
gain 3000 gain 1200 Double-THGEMs in Ne/5%CH4. Landau distributions recorded with an MCA. Thickness: 0.4mm Drift gap: 3.4mm THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

13 Single-THGEM, 10mm drift gap, muons
Single-THGEM with muons Landau distribution at a gain of 800. Thickness: 0.8mm Drift-gap: 10mm THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

14 Single-THGEM with muons: efficiency
10x10 cm Thicknes: 0.4 mm Particles: muons Gas: Ne/5%CH4 Drift gap: 3 mm Charge preamp/MCA 0.5 cm2 trigger e~96% THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

15 Single-THGEM/3mm drift
PIONS MUONS ~3 fC Measured very low discharge rates even with rates >>ILC THGEM: 0.4mm Gain: THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

16 THGEM for DHCAL: next… October 2010: run at CERN with muons/pions
Investigations with 1-THGEM & 2-THGEM with KPIX Gain & Efficiency Crosstalk between pads Discharge rates with m/p (continuation study) With SLAC: improving KPIX protection 30x30 cm THGEMs OCT RUN: New multiplier geometries & operation modes  well, gain in ind gap, resistive film… Other gases (Ne/CF4?) THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

17 Compact WELL-THGEM UV Gas: Ne/CH4 (%CH4 ~ 10%) UV WELL: lower HV
(similar to: Well-Counter of Bellazzini & of Alfonsi et al. CRETE 09) Present goal: Reduce to minimum multiplier thickness Gain with single-photons UV THGEM THGEM Single-THGEM 0.8mm Gas: Ne/CH4 (%CH4 ~ 10%) UV Gain with single-photons WELL-THGEM WELL-THGEM THGEM Single-THGEM 0.4mm WELL: lower HV 0.8mm  higher gain THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

18 RESISTIVE-WELL-THGEM
Drift Thin insulator Advantages: No induction gap Ground on both external electrodes Spark-protection of electronics Single- or double- THGEM ground + ++ ground Resistive film 6-7mm UNDER INVESTIGATIONS @ Weizmann THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

19 Well: Charge pulses on pad
55Fe WELL-THGEM ~SAME PULSE SHAPE With/without resistive film THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

20 THGEM: Induction gap configuration: effect of adding a resistive layer (1.3 MΩ/□)
Without multiplication in the induction gap With multiplication in the induction gap 55Fe THGEM With/without resistive film THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

21 THGEM Charge pulses WELL, THGEM and with multiplication in induction gap
55Fe THGEM 55Fe THGEM Eind 3.5 kV/cm THGEM 2.5kV/cm 1kV/cm well 55Fe WELL-THGEM Gain in induction gap: Broader pulse (IONS!) Might be beneficial for KPiX THGEM DHCAL - A. Breskin et al RD51 Bari Oct 2010

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