CO2 operation of an active target detector readout based on THGEM.

Research output: Research - peer-reviewArticle

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Abstract

We present and discuss a systematic study of the operation of THick Gaseous Electron Multipliers (THGEM)-like structures in pure CO2, in view of possible applications as Active Target Time Projection Chambers (AT-TPC) readout. The ultimate goal is to use oxygen-rich gas as active medium to perform nuclear physics/astrophysics experiments on stable oxygen isotopes (16O,17O,18O). We report the measurement of the effective avalanche gain of ceramic Multi-layer THGEMs (M-THGEMs), for different geometries (two- and three-layers M-THGEM) at various pressures. In addition, we report the analysis of the tracking performance of a large-volume AT-TPC equipped with a position-sensitive MICROMEGAS detector and double-cascade THGEMs pre-amplification stage. The AT-TPC was irradiated with 6.1 MeV α-particles from a 252Cf source mounted inside the detector vessel, filled with pure CO2 at 50 torr. High gain operation was achieved in CO2 at relative low pressure (0< 15 torr), of interest for AT-TPC experiments. For higher pressure the operation of the detector became unstable. The maximum achievable gain decreased to lower value - below 103 at 450 torr. Through the image analysis of the α-particle tracks we computed an energy resolution of around 3% (FWHM) based on the α-particle range, while the energy resolution from the collected charge is around 5% (FWHM).

LanguageEnglish (US)
Article numberP06003
JournalJournal of Instrumentation
Volume12
Issue number6
DOIs
StatePublished - Jun 1 2017

Profile

Time Projection Chamber
Multiplier
Detector
Electron
Target
photomultiplier tubes
readout
chambers
projection
detectors
Electron multipliers
Alpha particles
Detectors
alpha particles
Full width at half maximum
Oxygen
Experiments
Multilayer
Energy
Experiment

Keywords

  • Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc)
  • Time projection chambers; Time projection Chambers (TPC)

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics

Cite this

CO2 operation of an active target detector readout based on THGEM. / Ayyad, Y.; Cortesi, M.; Mittig, W.; Bazin, D.

In: Journal of Instrumentation, Vol. 12, No. 6, P06003, 01.06.2017.

Research output: Research - peer-reviewArticle

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