The micro-hole-and-strip plate gas detector: experimental results

Nuclear Instruments and Methods in Physics Research Section A:

Ferreira

et al. 2004

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Set-up and Descriptionmentioning

confidence: 99%

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Recent advances in X-ray detection with micro-hole and strip plate detector

Veloso

Nuclear Instruments and Methods in Physics Research Section A:

Ferreira

et al. 2004

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“…2). A single MHSP-electrode can provide total effective gain exceeding 10 3 , similar to a GEM [15,16].…”

Section: Motivationmentioning

confidence: 99%

Avalanche-ion back-flow reduction in gaseous electron multipliers based on GEM/MHSP

Nuclear Instruments and Methods in Physics Research Section A:

Mörmann

Breskin

et al. 2004

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We report on avalanche-ion back-flow measurements in the novel Micro-Hole and Strip-Plate (MHSP) multiplier and in gaseous photomultipliers comprising Gas Electron Multipliers (GEMs) followed by an MHSP. In a 3-GEMs/ MHSP photomultiplier with reflective photocathode, avalanche-ion back-flow fraction of B7% and B2% were recorded for respective effective gains of 10 7 and 10 6 , in Ar/CH 4 (95/5) at 760 Torr. This is about one order of magnitude reduction in ion back-flow compared to the best values measured in 4-GEMs photomultiplier at the same gain. We describe the mode of operation of the MHSP and explain its ion back-flow reduction features. r

“…The Micro-Hole & Strip Plate (MHSP) [1,2] is a new gaseous multiplier; it was conceived following the demonstration that a micro-strip gas counter (MSGC) [3] preceded by a gas electron multiplier (GEM) [4] pre-amplifying element has better stability compared to MSGC alone [5]. The MHSP combines the characteristics of both GEM and MSGC in a single, double-sided element.…”

Section: Introductionmentioning

confidence: 99%

Advances in the Micro-Hole & Strip Plate gaseous detector

Nuclear Instruments and Methods in Physics Research Section A:

Veloso

Santos

et al. 2003

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We report on the performance of a new gaseous electron multiplier: the Micro-Hole & Strip Plate (MHSP). It consists of two independent charge-amplification stages in a single, double-sided micro-structured electrode, deposited on a thin insulating substrate. Charge gains in excess of 10 3 were obtained in a MHSP operated with soft X-rays in Ar/CO 2 (70/ 30). We present the results of a systematic study of the MHSP properties and those of a double-stage GEM+MHSP multiplier. Applications to gaseous photomultipliers are discussed. r