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Electroluminescence yields in MicroMegas , THGEM and GEM

Electroluminescence yields in MicroMegas , THGEM and GEM. H. Natal da Luz 1 , C.M.B. Monteiro 1 , J.M.F. dos Santos 1 , C. Balan 1 , E.D.C. Freitas 1 , J.F.C.A. Veloso 2 , A. Breskin 3 , T. Papaevangelou 4 , I. Giomataris 4. 1 University of Coimbra, Portugal

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Electroluminescence yields in MicroMegas , THGEM and GEM

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  1. Electroluminescence yields in MicroMegas, THGEM and GEM H. Natal da Luz1, C.M.B. Monteiro1, J.M.F. dos Santos1, C. Balan1, E.D.C. Freitas1, J.F.C.A. Veloso2, A. Breskin3, T. Papaevangelou4, I. Giomataris4 • 1University of Coimbra, Portugal • 2University of Aveiro, Portugal • 3Weizmann Institute of Sciences, Israel • 4Centre d’ÉtudesNucléaires de Saclay, France

  2. Outline • Motivation; • Experimental setups withdifferentMPGDsand UV sensitiveLAAPDs; • Methods for determinationofElectro-luminescenceyields; • Results; • Conclusions.

  3. Motivation • Rareeventexperiments (eg.: darkmattersearch, neutrinolessdouble beta decay) cantakeadvantagesofreadingchargeandscintillationlightproducedbyMPGDs; • Decouplingofelectronicnoise; • Usuallymuchbetter SNR.

  4. MPGD scintillation vs. charge readout THGEM/GEM MicroMegas Gap: 50 mm Holediameter: 25 mm • Thickness: 0.4 mm • Hole diameter: 0.4 mm • Rim: 0.1 mm

  5. Charge (a) and scintillation (b) pulse-height distributions in MM LAAPD gain ~ 30

  6. MM EL Yield ------------------------

  7. MM charge gain in Xe

  8. Maximumchargegain Vs pressure (Xe)

  9. MM Chargegainfluctuations (Xe) 22 keV X-rays

  10. MM gain in scintillation-readout (Gtot = primary charge/charge out from LAAPD) LAAPD gain ~ 30

  11. Charge-to-scintillationgain ratio Lower E/p favours excitations

  12. Absolute EL Yield “out” of MM (Xe) • Double mesh, uniform field scintillation gap yields 466 photons/e-/cm @4.1 kV/cm/bar

  13. THGEM GainsinXe APD gain ~150

  14. THGEM EL yield in Xe

  15. Statistical fluctuations in THGEM

  16. GEM gain in Xe

  17. GEM EL yield (Xe)

  18. GEM statistical fluctuations

  19. THGEM in Ar

  20. GEM in Ar

  21. Conclusions • Double mesh, uniform field scintillation gap yields 466 photons/e-/cm @4.1 kV/cm/bar

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