Towards THGEM UV-photon detectors for RICH: on single-photon detection efficiency in Ne/CH4 and Ne/CF4

Abstract

The article deals with the detection efficiency of UV-photon detectors consisting of Thick Gas Electron Multipliers (THGEM) coated with CsI photocathode, operated in atmospheric Ne/CH4 and Ne/CF4 mixtures. We report on the photoelectron extraction efficiency from the photocathode into these gas mixtures, and on the photoelectron collection efficiency into the THGEM holes. Full collection efficiency was reached in all gases investigated, in some cases at relatively low multiplication. High total detector gains for UV photons, in excess of 10^5, were reached at relatively low operation voltages with a single THGEM element. We discuss the photon detection efficiency in the context of possible application to RICH.

13 pages, 9 figures, 1 table. Presented at MPGD09, Crete, June 2009; to be published in JINST-proceedings

References in corpus (7)

• A concise review on THGEM detectors
• THGEM operation in Ne and Ne/CH4
• First Tests of Thick GEMs with Electrodes Made of a Resistive Kapton
• Investigations of a THGEM-based imaging detector
• Operation of a Thick Gas Electron Multiplier (THGEM) in Ar, Xe and Ar-Xe
• Time resolution of a Thick Gas Electron Multiplier (THGEM) - based detector
• The current progress of the ALICE Ring Imaging Cherenkov Detector

Cited by in corpus (19)

• CsI-THGEM gaseous photomultipliers for RICH and noble-liquid detectors
• THGEM-based detectors for sampling elements in DHCAL: laboratory and beam evaluation
• Liquid Hole-Multipliers: A potential concept for large single-phase noble-liquid TPCs of rare events
• On the operation of a Micropattern Gaseous UV-Photomultiplier in Liquid-Xenon
• First observation of Cherenkov rings with a large area CsI-TGEM-based RICH prototype
• Beam Studies of the Segmented Resistive WELL: a Potential Thin Sampling Element for Digital Hadron Calorimetry
• Hybrid Multi Micropattern Gaseous Photomultiplier for detection of liquid-xenon scintillation
• THGEM gain calculations using Garfield++: Solving discrepancies between the simulation and experimental data
• Recent advances with THGEM detectors
• The Thick Gas Electron Multiplier and its derivatives: physics, technologies and applications
• First Tests of Gaseous Detectors Made of a Resistive Mesh
• Charged Kaon Mass Measurement using the Cherenkov Effect
• A concept for laboratory studies of radiation detectors over a broad dynamic-range: instabilities evaluation in THGEM-structures
• Evolution and Recent Developments of the Gaseous Photon Detectors Technologies
• First studies of electron transport along small gas gaps of novel foil radiation converters for fast-neutron detectors
• Direct measurements of the properties of Thick-GEM reflective photocathodes
• Beam studies of novel THGEM-based potential sampling elements for Digital Hadron Calorimetry
• Cryogenic Gaseous Photomultiplier for Position Reconstruction of Liquid Argon Scintillation Light
• Single Electron Spectra in RPWELL-based detectors