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Photoelectron extraction and collection efficiency studies in CsI-THGEM for Ne based mixtures

Photoelectron extraction and collection efficiency studies in CsI-THGEM for Ne based mixtures. C.D.R. Azevedo , M . Cortesi, A.V. Lyashenko, A. Breskin, R. Chechik, J. Miyamoto, V. Peskov, J. Escada, J.F.C.A. Veloso and J.M.F. dos Santos Physics Department – University of Aveiro

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Photoelectron extraction and collection efficiency studies in CsI-THGEM for Ne based mixtures

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  1. Photoelectron extraction and collection efficiency studies in CsI-THGEM for Ne based mixtures C.D.R. Azevedo, M. Cortesi, A.V. Lyashenko, A. Breskin, R. Chechik, J. Miyamoto, V. Peskov, J. Escada, J.F.C.A. Veloso and J.M.F. dos Santos Physics Department – University of Aveiro Physics Department – University of Coimbra Weizmann Institute of Science

  2. Motivation • THGEM in Ne mixtures • Highgain @ lowvoltages • reduced discharge probability • discharge energy • charging-up effects • Single photoelectron detection capability • Collectionandextractionefficiency • Effective photon detection efficiency

  3. Gain

  4. Extraction efficiency (εextr)

  5. Extraction efficiency (εextr)

  6. Photocathode Electric Field

  7. Collection efficiency (εcoll)

  8. Collection efficiency (εcoll)

  9. Collection efficiency (εcoll)

  10. Effective photon detection efficiency (εeffph) • This geometry: t = 0.4 mm, a = 0.7 mm, d = 0.3 mm, h = 0.1 mm • Perspectives for optimized geometry: t = 0.4 mm, a = 1 mm, d = 0.3 mm, h = 0.01 mm

  11. Conclusions • Gain > 105 were reached in all mixtures • 106 in Ne/10%CF4 • Extraction efficiency (εextr) > 72% @ 1.5 kV/cm • 83% @ 2 kV/cm in Ne/10%CF4 • Full collection efficiency (εcoll) @ realistic operation conditions • Effective photon detection efficiency 12 < εeffph < 14% • 20% < εeffph < 23% with optimized geometry • 83% @ 2 kV/cm in Ne/10%CF4

  12. Thanks for your attention

  13. Backup Slides

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