Performance of high pressure Xe/TMA in GEMs for neutron and X-ray detection

Kreuger, R.; Eijk, C.W.E. van; Fraga, F.A.F.; Fraga, M.M.F.R.; Fetal, S.T.G.; Hollander, R.W.; Margato, L.M.S.; Vuure, T.L. van

doi:10.1109/nssmic.2001.1008498

Cited by 8 publications

(17 citation statements)

References 3 publications

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“…A drawback to the use of pressurised gaseous detectors, particularly, micropattern detectors such as MSGCs, GEMs and MHSPs, relates to the fact that detector gain drops with increasing gas pressure [4,6,15,16]. The gain limitation is due to the lower values of the Townsend first ionisation coefficient at higher gas pressure.…”

Section: B the Stopping Gasmentioning

confidence: 99%

“…The gain limitation is due to the lower values of the Townsend first ionisation coefficient at higher gas pressure. For a single GEM detector, CF 4 fillingpressures above 2-bar deliver gains below 10, too low to be of any use in neutron detection [4]. carbon-based molecules, such as propane and C 3 F 8 , the situation is even worse, and it is not possible to operate the GEM with suitable gains at the required filling pressure [4].…”

Section: B the Stopping Gasmentioning

confidence: 99%

“…Xenon-based penning mixtures have been investigated [4,6] and it has been demonstrated that a single GEM can be operated in Xe-2.5% Trimethylamine (TMA) with suitable gains, at high pressures. Gains of about 100 have been obtained for a single GEM operating at 4-bar, the pressure required for a 1-mm position resolution [4]. However, a drawback of using xenon as a stopping gas results from its high sensitivity to background gamma-radiation.…”

Section: B the Stopping Gasmentioning

confidence: 99%

“…Although this centroid does not coincide with the neutron interaction-position due to the fact that the proton track is three times longer than the triton track, with the highest ionisation density at the end of the tracks, the centroid distribution around that interaction-point results in an intrinsic position resolution, FWHM, which is approximately 70% of the proton range [4,8].…”

mentioning

confidence: 99%

“…Additionally, other micropattern detectors such as microgap chambers (MGC) [11], pin-pixel detectors [2] and detectors based on the gas electron multiplier (GEM) [4,6] have been investigated.…”

mentioning

confidence: 99%

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Micro-hole & strip plate detector for neutron detection

Veloso

Amaro²,

Santos³

et al. 2003

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)

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We propose the use of argon-xenon penningmixtures as the stopping gas, in substitution of carbon-based gases, in 3 He neutron detectors. Such stopping gas presents a solution for the use of GEMs or MHSPs electron multipliers with suitable gains for neutron detection. With these mixtures it is possible to obtain a sealed detector with only rare-gas filling which is simple to purify and not subject to ageing.A MHSP gas detector filled with a 3-bar argon/50-mbar xenon/6-bar helium mixture can achieve gains above 2 x 10 3 . This mixture allows neutron detection efficiencies of about 70% for a 2.5-cm thick absorption region and intrinsic position resolution (FWHM) of about 1.7-mm. Increasing the argon partial pressure to 6-bar, it is possible to reduce the detector intrinsic position resolution to 1-mm. The sensitivity to γ-rays will be the same when compared to that of 2.6-bar CF 4 .

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Section: B the Stopping Gasmentioning

confidence: 99%

Section: B the Stopping Gasmentioning

confidence: 99%

Section: B the Stopping Gasmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Micro-hole & strip plate detector for neutron detection

Veloso

Amaro²,

Santos³

et al. 2003

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)

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The 2D-Micro Hole & Strip Plate in CF₄atmosphere aiming neutron imaging

et al. 2009

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The Micro Hole & Strip Plate (MHSP) achieves gains above 300 in tetrafluoromethane (CF 4 ) at 2.6 bar, making it suitable for neutron detection. Over the past few years, the imaging capabilities of the MHSP have been developed, leading to the 2D-MHSP. In this device, the position coordinates are determined using the principle of resistive charge division. The GEM-side was specially patterned in strips interconnected by a resistive strip for one of the coordinates and, in the MS-side, the anode strips were also interconnected by another resistive strip. By applying a trivial center of mass algorithm it is possible to obtain both coordinates and the energy of each detected event. The ability to register position and energy for each event can be very useful for event validation in neutron detection. In this work, the performance of the 2D-MHSP in CF 4 is investigated. The Modular Transfer Function (MTF) is presented, showing that position resolutions of 700 µm in x and 1 mm in the y-direction are obtained with X-rays. It is also demonstrated that resolutions below the proton range (1 mm) are possible at 2.6 bar CF 4 , demonstrating that the MHSP can be a cost effective choice for neutron imaging.

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Investigations with Gaseous Electron Multipliers for use on the ISIS spallation neutron source

et al. 2012

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Several investigations have been undertaken to ascertain the suitability of gaseous electron multipliers (GEMs) for use as a neutron detector on the ISIS spallation neutron source. Our initial investigations focused purely on whether these devices could be operated at the elevated pressure of 3 He and CF 4 necessary for 1mm position resolution (2.6 bars of CF 4 ). In fact we were able to operate the GEMs at suitable gains with 3.5 bars of CF 4 . However encouraging these results were, we found that the GEMs charged up over time, which we postulated was due to the kapton substrate. A similar problem was seen at the early stages of the development of the microstrip gas chamber (MSGC), a solution of which was to use the semiconducting glass Schott S8900 as the substrate. Therefore we focused our attention to the manufacture of a GEM structure on an S8900 substrate. Our first devices were manufactured from 1mm thick glass and exhibit gains in excess of 1×10 4 for a single GEM stage in an argon isobutane gas mixture, when illuminated with 55 Fe xrays. A small amount of charging under irradiation has been observed in a flowing gas mixture, but the GEMs quickly stabilise and track atmospheric conditions. Further measurements in a 3 He:CF 4 atmosphere will show how suited these devices are to the needs of ISIS.

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Performance of high pressure Xe/TMA in GEMs for neutron and X-ray detection

Cited by 8 publications

References 3 publications

Micro-hole & strip plate detector for neutron detection

Micro-hole & strip plate detector for neutron detection

The 2D-Micro Hole & Strip Plate in CF₄atmosphere aiming neutron imaging

Investigations with Gaseous Electron Multipliers for use on the ISIS spallation neutron source

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Performance of high pressure Xe/TMA in GEMs for neutron and X-ray detection

Cited by 8 publications

References 3 publications

Micro-hole &amp; strip plate detector for neutron detection

Micro-hole &amp; strip plate detector for neutron detection

The 2D-Micro Hole & Strip Plate in CF4atmosphere aiming neutron imaging

Investigations with Gaseous Electron Multipliers for use on the ISIS spallation neutron source

Contact Info

Product

Resources

About

Micro-hole & strip plate detector for neutron detection

Micro-hole & strip plate detector for neutron detection

The 2D-Micro Hole & Strip Plate in CF₄atmosphere aiming neutron imaging