Simulating response functions and pulse shape discrimination for organic scintillation detectors with Geant4

Hartwig, Zachary; Gumplinger, P.

doi:10.1016/j.nima.2013.11.027

Cited by 33 publications

(33 citation statements)

References 23 publications

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“…Importantly, the method is now included in the worldleading Monte Carlo simulation toolkit of particle, nuclear, space, and detector physics, Geant4. The results have been published in [6].…”

Section: Science Contributions "mentioning

confidence: 99%

“…The method enables the simulation of time-resolved production (linear or nonlinear), transport, and readout of photons in a detector of arbitrary geometry, scintillator choice, structural materials, and light readout configuration, all potentially within the complexity of an encompassing experiment geometry [6]. The code was written in collaboration with Peter Guniplinger of TRIUMF, and, as an indication of its widespread utility in detector modeling outside of AIMS simulation, has been incorporated into Geant4 [87], one of the leading Monte Carlo particle transport codes for high energy, nuclear, space, medical, and detector physics.…”

Section: A New Scintillation Model For Geant4mentioning

confidence: 99%

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An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices

Hartwig

Barnard

Lanza

et al. 2013

Review of Scientific Instruments

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Plasma-material interactions (PMI) in magnetic fusion devices such as fuel retention, material erosion and redeposition, and material mixing present significant scientific and engineering challenges, particularly for the next generation of devices that will move towards reactor-relevant conditions. Achieving an integrated understanding of PMI, however, is severely hindered by a dearth of in-situ diagnosis of the plasma-facing component (PFC) surfaces. To address this critical need, this thesis presents an accelerator-based diagnostic that nondestructively measures the evolution of PFC surfaces in-situ. The diagnostic aims to remotely generate isotopic concentration maps that cover a large fraction of the PFC surfaces on a plasma shot-to-shot timescale.The diagnostic uses a compact, high-current radio-frequency quadrupole accelerator to inject 0.9 MeV deuterons into the Alcator C-Mod tokamak. The tokamak magnetic fields in between plasma shots are used to steer the deuterons to PFCs where the deuterons cause high-Q nuclear reactions with low-Z isotopes ~5 pim into the material. Scintillation detectors measure the induced neutrons and gammas; energy spectra analysis provides quantitative reconstruction of surface concentrations. An overview of the diagnostic technique, known as accelerator-based in-situ materials surveillance (AIMS), and the first AIMS diagnostic on the Alcator C-Mod is given; a description of the complementary simulation tools is also provided. Experimental validation is shown to demonstrate the optimized beam injection into the tokamak, the quantification of PFC surfaces isotopes, and the measurement localization provided by magnetic beam steering. Finally, the first AIMS measurements of fusion fuel retention are presented, demonstrating the local erosion and codeposition of deuterium-saturated boron surface filns. The finding confirms that deuterium codeposition with boron is insufficient to account for the net fuel retention in Alcator C-Mod.

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Section: Science Contributions "mentioning

confidence: 99%

Section: A New Scintillation Model For Geant4mentioning

confidence: 99%

An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices

Hartwig

Barnard

Lanza

et al. 2013

Review of Scientific Instruments

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“…Others have more comprehensively simulated response functions and pulse shape discrimination (PSD) for organic scintillation detectors with Geant4 [15], demonstrating excellent agreement, among others, between experimental and simulated energy spectra for a detector exposed to 0.662 MeV gammas from Cs-137. The ability to simulate a detector of varying complexity and configuration within a single Monte Carlo code is impressive but indeed complex and does not encompass features derived from the processing electronics such as pre-amplification, pulse shaping and digitization.…”

Section: Introductionmentioning

confidence: 93%

Modeling Photo-multiplier Gain and Regenerating Pulse Height Data for Application Development

Aspinall¹,

Jones²

2018

EPJ Web Conf.

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Abstract-Systems that adopt organic scintillation detector arrays often require a calibration process prior to the intended measurement campaign to correct for significant performance variances between detectors within the array. These differences exist because of low tolerances associated with photo-multiplier tube technology and environmental influences. Differences in detector response can be corrected for by adjusting the supplied photo-multiplier tube voltage to control its gain and the effect that this has on the pulse height spectra from a gamma-only calibration source with a defined photo-peak. Automated methods that analyze these spectra and adjust the photomultiplier tube bias accordingly are emerging for hardware that integrate acquisition electronics and high voltage control. However, development of such algorithms require access to the hardware, multiple detectors and calibration source for prolonged periods, all with associated constraints and risks. In this work, we report on a software function and related models developed to rescale and regenerate pulse height data acquired from a single scintillation detector. Such a function could be used to generate significant and varied pulse height data that can be used to integration-test algorithms that are capable of automatically response matching multiple detectors using pulse height spectra analysis. Furthermore, a function of this sort removes the dependence on multiple detectors, digital analyzers and calibration source. Results show a good match between the real and regenerated pulse height data. The function has also been used successfully to develop auto-calibration algorithms.

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“…Optical physics GEANT4 can accurately simulate nonlinear scintillators where the light yield is a function of particle type, energy deposition and kinetic energy of the ionizing particle [99]. In scintillators with a linear response, light production is directly proportional to the ionizing energy deposited and the total light produced can be computed as the sum of the light produced during small simulation steps without regard for the kinetic energy of the ionizing particle at each energy-depositing step.…”

Section: Atomic De-excitationmentioning

confidence: 99%

Recent Developments in Geant4

2014

SNA + MC 2013 - Joint International Conference on Supercomputing in Nuclear Applications + Monte Carlo

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During the last two to three years extensive development of the Geant4 simulation toolkit has occurred, which will culminate in a major release at the end of 2013. This development includes the adoption of multi-threading, the extension and improvement of physics models, improvements to the geometry modeler with a revised implementation of most geometrical primitives, advances in visualization and graphical user interfaces (GUI), the move from GNU make to CMake and the extension and automation of the Geant4 testing suite. The reasons for and implementation of multi-threading will be discussed. Certain electromagnetic and hadronic model extensions will also be discussed along with their effects on calorimeter results. Finally, visualization and GUI improvements will be highlighted along with the new configuration, build and testing systems.

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Simulating response functions and pulse shape discrimination for organic scintillation detectors with Geant4

Cited by 33 publications

References 23 publications

An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices

An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices

Modeling Photo-multiplier Gain and Regenerating Pulse Height Data for Application Development

Recent Developments in Geant4

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