Numerical estimation of discharge probability in GEM-based detectors

Rout, P. K.; Kanishka, R.; Datta, Jaydeep; Roy, Promita; Bhattacharya, Purba; Mukhopadhyay, Supratik; Majumdar, N.; Sarkar, Sandip

doi:10.1088/1748-0221/16/09/p09001

Cited by 7 publications

(8 citation statements)

References 35 publications

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“…The internal structure in the matter under consideration is neglected and replaced by average bulk properties. However, such descriptions have found to work reasonably well even for complex detector structures, such as triple GEM devices [26,27].…”

Section: Mathematical Modelsmentioning

confidence: 99%

Numerical modelling of gaseous ionization detectors

Mukhopadhyay

Bhattacharya

Rout

et al. 2022

J. Phys.: Conf. Ser.

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The working of gaseous ionization detectors can be broadly broken into few major steps: generation of primaries, their transport and amplification due to applied electromagnetic field, and, finally, induction of signal on pick-up electrodes due to movement of electrons and ions. Proper design and optimum utilization of such detectors require thorough understanding of each of these steps. Since they possess significant complexity, numerical modelling turns out to be an important tool to explore the dynamics and response of these detectors. There are several possible approaches that may be adopted to carry out detailed and realistic numerical simulation of gaseous detectors. Among these, the Monte-Carlo particle approach adopted by the Garfield++ toolkit is among the most prominent possibilities. Recently, a deterministic hydrodynamic approach has also turned out to be useful for this purpose. The steps necessary to create mathematical and numerical models of a gaseous detector is presented here, utilizing both particle and hydrodynamic approaches. Simple examples are used to illustrate the advantages and disadvantages of both the approaches.

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Section: Mathematical Modelsmentioning

confidence: 99%

Numerical modelling of gaseous ionization detectors

Mukhopadhyay

Bhattacharya

Rout

et al. 2022

J. Phys.: Conf. Ser.

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“…Further the de-excitation of the argon atom ionises CO2 via photo absorption. An alpha beam ( 241 Am) of 5.6 MeV energy placed at the middle of the gas volume was shot as per the experimental set-up [8,9]. The three-dimensional active gas volume had dimensions of 5 cm along x and y, and 20 cm along z direction.…”

Section: Generation Of Primariesmentioning

confidence: 99%

“…Also, it has been proposed that charge density in the amplification region could lead to discharge and disturb the stability of the detector. Primary ionization simulated using geant4 [7] with an alpha source radiating into an argon gas mixture has already been reported in [8,9]. Apart from alpha simulation [8] we present here the simulation of primary ionization in argon based gas mixtures using muon and 55 Fe to get the number of primaries, energy and spatial information.…”

Section: Introductionmentioning

confidence: 98%

“…Primary ionization simulated using geant4 [7] with an alpha source radiating into an argon gas mixture has already been reported in [8,9]. Apart from alpha simulation [8] we present here the simulation of primary ionization in argon based gas mixtures using muon and 55 Fe to get the number of primaries, energy and spatial information. Additionally heed++ simulation has been presented here.…”

Section: Introductionmentioning

confidence: 98%

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Primary Ionization Simulation for Different Gas Mixtures

Kanishka

Mukhopadhyay²,

Majumdar³

et al. 2022

J. Phys.: Conf. Ser.

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The primary ionization in a gas mixture is crucial in nuclear and particle physics experiments. In many particle physics experiments, the primary ionization is utilized in understanding the charge density and discharge formation studies. We present the simulation of primary ionization in argon based gas mixtures to get the number of primaries, energy and spatial information with geant4 and heed++ toolkits that have been used to simulate the passage of particles through the matter. The geant4 toolkit has an advantage of obtaining the particle information like energy deposition and position co-ordinates after each step i.e., at which the particle has done some interactions in a complex, realistic, three-dimensional geometry. These steps generate each interactions after computing the cross-sections of physics processes that were taken into account for this simulation in a gas volume. The number of primaries generated with the geant4 toolkit were also compared with those obtained using heed+ +. Alpha and muons were simulated to study the primary ionization. A similar study of primary ionization was carried out with 55Fe which is radioactive in nature and captures electron. 55Mn (X-rays), νe, auger electrons and gammas were produced in this process. Gamma simulation has also been carried out. The responses of alpha, muon, 55Fe and gamma in the argon based gas mixtures were found to be distinct due to their different properties.

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“…The hybrid model, on the other hand, uses HEED and MAGBOLTZ information to simulate dynamics of electron and ion species within a background neutral fluid medium utilizing the Transport of Dilute Species (TDS) interface of COMSOL. The hydrodynamic model [25,34], by its very nature, does not attempt to follow charged particles as isolated and independent (although interacting) entities. It considers the detector medium as a continuum (solvent), which a reasonable approximation, especially under normal conditions.…”

Section: Mathematical Modelsmentioning

confidence: 99%

Effect of hole geometry on charge sharing and other parameters in GEM-based detectors

Roy,

Bhattacharya,

Rout

et al. 2021

Preprint

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Gas Electron Multipliers (GEM) are among the more prominent Micro-Pattern Gaseous Detectors (MPGDs) and widely used in high energy particle physics experiments and various related applications. Adoption of different production techniques lead to holes of varying geometries in GEM foils. Since the response of a GEM-based detector is closely related to the hole geometry through the influence of the latter on charge sharing and transport through GEM foils, attempts have been made to relate hole configurations to different figures of merit of a detector. Numerical simulations have been performed to study the effects of hole geometry on important parameters such as charge sharing, collection efficiency, extraction efficiency, gain, possibility of transition from avalanche to streamer modes for single, double and triple layer GEM detectors. The numerical estimates have been compared to available experimental data. The comparisons, although not always in agreement, are found to be generally encouraging.

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Numerical estimation of discharge probability in GEM-based detectors

Cited by 7 publications

References 35 publications

Numerical modelling of gaseous ionization detectors

Numerical modelling of gaseous ionization detectors

Primary Ionization Simulation for Different Gas Mixtures

Effect of hole geometry on charge sharing and other parameters in GEM-based detectors

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