scholarly journals Backscattered Electrons Spectra and Angular Distributions: Simulations with EGS5

2018 ◽  
Vol 3 (10) ◽  
pp. 95-102
Author(s):  
Sylvian Kahane
Keyword(s):  
Monte Carlo ◽  
Energy Spectrum ◽  
Angular Distributions ◽  
Monte Carlo Code ◽  
Backscattering Coefficient ◽  
High Q ◽  
Backscattered Electrons ◽  
Common Memory ◽  
Electron Photon ◽  
Configuration Simulation

The purpose of the present study is to compare numerical Monte Carlo simulations of backscattering of electrons, mainly in the keV range, with available experimental data. The final goal is to assess the ability of the Monte Carlo code to predict viable results, in view of the complexity and difficulty of performing experimental measurements. A specific code for simulating electrons backscattering was developed, based on the EGS5 electron-photon transport routines. The code was parallelized very efficiently for a common memory configuration. Simulation results for the backscattering coefficient h, the energy spectrum dh/dq, and the angle dependent energy spectrum dh/dqdW were obtained. Comparing with experiments shows agreement from very good to fair, especially in regions of high q (energy) values. For low values of q there are not experimental results due to difficulties in measurements. Hence, the Monte Carlo program can provide good estimates, in the range of energies from tens of keV up to 100-200 keV.

scholarly journals Comptonization of CMB in galaxy clusters. Monte Carlo computations

2020 ◽  
Vol 499 (2) ◽  
pp. 2994-3005
Author(s):  
M I Gornostaev ◽  
G V Lipunova
Keyword(s):  
Monte Carlo ◽  
Galaxy Clusters ◽  
Spectral Shape ◽  
Angular Distributions ◽  
Wide Energy Range ◽  
Monte Carlo Code ◽  
Spatial Distributions ◽  
Microwave Background ◽  
Maxwellian Plasma ◽  
Wide Energy

ABSTRACT The problem under consideration is to determine the change of the cosmic microwave background (CMB) spectral shape due to the thermal Sunyaev–Zeldovich (tSZ) effect. We numerically model the spectral intensity of the CMB radiation Comptonized by the hot intergalactic Maxwellian plasma. To this aim, a relativistic Monte Carlo code with photon weights is developed. The code enables us to construct the Comptonized CMB spectrum in a wide energy range. The results are compared with known analytical solutions and previous numerical simulations. We also calculate the angular distributions of the intensity of radiation emerging from the cloud, which show that the spectral shape of the tSZ effect is not universal for different directions of escaping photons. The numerical method can be applied to simulate the processes of Comptonization for different optical depths, temperatures, initial spectra of photon sources, and their spatial distributions, the obtained results may have implications on investigating the profiles of galaxy clusters.

MONTE CARLO CALCULATION OF SLOW ELECTRON BEAM TRANSPORT IN SOLIDS: REFLECTION COEFFICIENT THEORY IMPLICATIONS

2012 ◽  
Vol 26 (04) ◽  
pp. 1150022 ◽  
Author(s):  
A. BENTABET
Keyword(s):  
Monte Carlo ◽  
Electron Transport ◽  
Reflection Coefficient ◽  
Penetration Depth ◽  
Cross Section ◽  
Monte Carlo Code ◽  
Slow Electron ◽  
Backscattering Coefficient ◽  
Transport Cross Section ◽  
The Mean

The reflection coefficient theory developed by Vicanek and Urbassek showed that the backscattering coefficient of light ions impinging on semi-infinite solid targets is strongly related to the range and the first transport cross-section as well. In this work and in the electron case, we show that not only the backscattering coefficient is, but also most of electron transport quantities (such as the mean penetration depth, the diffusion polar angles, the final backscattering energy, etc.), are strongly correlated to both these quantities (i.e. the range and the first transport cross-section). In addition, most of the electron transport quantities are weakly correlated to the distribution of the scattering angle and the total elastic cross-section as well. To make our study as straightforward and clear as possible, we have projected different input data of elastic cross-sections and ranges in our Monte Carlo code to study the mean penetration depth and the backscattering coefficient of slow electrons impinging on semi-infinite aluminum and gold in the energy range up to 10 keV. The possibility of extending the present study to other materials and other transport quantities using the same models is a valid process.

TARGET-ASSOCIATED PARTICLE PRODUCTION IN ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS

1991 ◽  
Vol 06 (01) ◽  
pp. 29-39 ◽  
Author(s):  
K. SENGUPTA ◽  
P. L. JAIN ◽  
G. SINGH
Keyword(s):  
Monte Carlo ◽  
Particle Production ◽  
Low Energy ◽  
Angular Distributions ◽  
Monte Carlo Code ◽  
200 Gev

We report the multiplicity and angular distributions of the low energy target-associated particles from 32 S and 16 O induced reactions at 200 GeV/nucleon and 16 O induced reactions at 60 GeV/nucleon in emulsion. The results are compared with the Monte-Carlo Code VENUS.

Electron Scattering in Solids

1990 ◽  
Vol 48 (2) ◽  
pp. 4-5
Author(s):  
Ryuichi Shimizu ◽  
Ze-Jun Ding
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Angular Distribution ◽  
Elastic Scattering ◽  
Electron Scattering ◽  
Cross Sections ◽  
Expansion Method ◽  
Electron Excitation ◽  
Partial Wave Expansion ◽  
Backscattered Electrons

Monte Carlo simulation has been becoming most powerful tool to describe the electron scattering in solids, leading to more comprehensive understanding of the complicated mechanism of generation of various types of signals for microbeam analysis.The present paper proposes a practical model for the Monte Carlo simulation of scattering processes of a penetrating electron and the generation of the slow secondaries in solids. The model is based on the combined use of Gryzinski’s inner-shell electron excitation function and the dielectric function for taking into account the valence electron contribution in inelastic scattering processes, while the cross-sections derived by partial wave expansion method are used for describing elastic scattering processes. An improvement of the use of this elastic scattering cross-section can be seen in the success to describe the anisotropy of angular distribution of elastically backscattered electrons from Au in low energy region, shown in Fig.l. Fig.l(a) shows the elastic cross-sections of 600 eV electron for single Au-atom, clearly indicating that the angular distribution is no more smooth as expected from Rutherford scattering formula, but has the socalled lobes appearing at the large scattering angle.

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