Development of a cold-neutron imaging detector based on thick gaseous electron multiplier

Cortesi, M.; Zboray, Robert; Kaestner, Anders; Prasser, H.-M.

doi:10.1063/1.4793225

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…Gain fluctuations may be the result of geometry imperfections of the THGEM multiplier originating from the mechanical drilling process (such as variation of the hole diameter and of the insulator substrate thickness) from the chemical etching (resulting in different widths of the copper rim around the holes), from mechanical defects of the detector assembly (support structures and readout board), or from intrinsic gain variations between channels of the front-end electronics. Correction of the detector gain inhomogeneity is usually performed as a post-processing analysis, for instance using flat-field correction techniques [30]. With this approach, the pulseheight profile of an alpha track measured in He at 350 torr, resulting from a uniform energy loss, was taken as a calibration for correcting the profile measured at 760 torr.…”

Section: Alpha Tracks and Energy Resolutionmentioning

confidence: 99%

Operation of a THGEM-based detector in low-pressure Helium

Cortesi¹,

Yurkon²

2015

J. Inst.

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In view of a possible application as a charge-particle track readout for an Active Target Time Projection Chamber (AT-TPC), the operating properties of THick Gaseous Electron Multipliers (THGEM) in pure low-pressure Helium were investigated. This paper includes the effective gain dependence on pressure for different detector configurations (single-, double-, triple-cascade setup), long-term gain stability and energy resolution from tracks of 5.5 MeV alpha particles. Stable operational conditions and maximum detector gains of 10 4 -10 7 have been achieved in pure Helium at pressure ranging from 100 torr up to 760 torr. Energy resolution of 6.65% (FWHM) for 690 keV of energy deposited by 5.5 MeV alpha particles at 350 torr was measured. The expected energy resolution for the full track is around 2.4% (FWHM). These results, together with the robustness of THGEM electrodes against spark damage, make THGEM structures highly competitive compared to other technologies considered for TPC applications in an active target operating with pure noble gases, requiring a high dynamic range and a wide operating pressure range down to few hundred torr.

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Section: Alpha Tracks and Energy Resolutionmentioning

confidence: 99%

Operation of a THGEM-based detector in low-pressure Helium

Cortesi¹,

Yurkon²

2015

J. Inst.

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“…Although it is considered to be the main contributor to position resolution [15], it is important to include other contributions in future work, such as those caused by charge transfer and collection processes in the gaseous detector, in order to reach a more accurate spatial resolution. The geometry of the gaseous detector, namely the depth of the drift region, also impacts significantly the position resolution [21]. The effect of these contributions can be measured using the spatial distribution of the primary charges obtained with GEANT4 as an input for simulation software such as Garfield++ [22], which provides a detailed simulation of two and three-dimensional drift chambers, where geometry and polarization of the readout electrodes can be defined, to generate a corresponding detector response.…”

Section: Discussionmentioning

confidence: 99%

Improving position resolution of neutron detectors with ultra-thin B₄C foils

Duarte¹,

Marcos²,

Antognini³

et al. 2022

J. Inst.

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A new technique for detection of slow neutrons with gaseous detectors using ultra-thin layers with 10B atoms is presented. The reaction between a thermal neutron and a 10B atom releases two secondary particles, namely a 7Li ion and an alpha particle, which due to momentum conservation are emitted in opposite directions, along the same line (back to back). Current boron coated neutron detectors are equipped with 10B films with thicknesses of several micrometers, deposited on very thick substrate plates. However, since the ranges of the 7Li ion and the alpha particle are of few micrometeres in most materials, one of these particles is always lost in the 10B layer or substrate. As such, these detectors lose the ability to reconstruct the reaction line of action and to precisely determine the neutron position, as only one of the two secondary particles tracks can be measured. With the technique now presented, the sum of the 10B layer and the substrate thicknesses is small enough to allow for both secondary particles to escape and ionize the gas in opposite sides of the 10B converter foil. Independent readout structures, one on each side of the 10B converter foil, detect each secondary particle and determine its track centroid and the deposited energy. Since the two secondary particles are emitted back to back, the neutron position can be obtained by combining the information recorded by the two readout structures. Through GEANT4 simulations, we verified that the spatial resolution can be significantly improved: our results show that, by using a B4C layer with a thickness of 1 μm on a 0.9 μm Mylar substrate, the spatial resolution can by improved by a factor of eight, compared to conventional detectors with thick 10B detection layers.

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“…However, as they are uncommon in the neutron scattering field, development is needed to customise them for the particular use. Similar development steps would be necessary for other more exotic detector solutions, in order to ensure their performance suitability and stability [49][50][51].…”

Section: Rates For the Transmission Detectormentioning

confidence: 99%

Detector rates for the Small Angle Neutron Scattering instruments at the European Spallation Source

et al. 2018

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A: Building the European Spallation Source (ESS), the most powerful neutron source in the world, requires significant technological advances at most fronts of instrument component design. Detectors are not an exception. The existing implementations at current neutron scattering facilities are at their performance limits and sometimes barely cover the scientific needs. At full operation the ESS will yield unprecedented neutron brilliance. This means that one of the most challenging aspects for the new detector designs is the increased rate capability and in particular the peak instantaneous rate capability, i.e. the number of neutrons hitting the detector per channel, pixel or cm 2 at the peak of the neutron pulse. This paper focuses on estimating the incident and detection rates that are anticipated for the Small Angle Neutron Scattering (SANS) instruments planned for ESS. Various approaches are applied and the results thereof are presented.

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Development of a cold-neutron imaging detector based on thick gaseous electron multiplier

Cited by 10 publications

References 24 publications

Operation of a THGEM-based detector in low-pressure Helium

Operation of a THGEM-based detector in low-pressure Helium

Improving position resolution of neutron detectors with ultra-thin B₄C foils

Detector rates for the Small Angle Neutron Scattering instruments at the European Spallation Source

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Development of a cold-neutron imaging detector based on thick gaseous electron multiplier

Cited by 10 publications

References 24 publications

Operation of a THGEM-based detector in low-pressure Helium

Operation of a THGEM-based detector in low-pressure Helium

Improving position resolution of neutron detectors with ultra-thin B4C foils

Detector rates for the Small Angle Neutron Scattering instruments at the European Spallation Source

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Product

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Improving position resolution of neutron detectors with ultra-thin B₄C foils