CCC-0117 BETA-2B. (Abstract last modified 01-SEP-1977)
1.
NAME OR DESIGNATION OF PROGRAM - BETA-2B. 2.
COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -
To request or retrieve programs click on the one of the active versions below.
A password and special authorization is required. Explanation of the status codes.
Machines used:
Package-ID Orig.Computer Test Computer
CCC-0117/01 IBM 370 series IBM 370 series
3.
DESCRIPTION OF PROBLEM OR FUNCTION - BETA-2B is a time-dependent Monte Carlo bremsstrahlung and electron transport analysis code for complex geometries. It is designed primarily for electron energy deposition calculations.
4.
METHOD OF SOLUTION - BETA-2B uses a condensed history Monte Carlo technique. 5.
RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - Calculational 6.
TYPICAL RUNNING TIME - The following sample problems were run on a CDC 6600. 7.
UNUSUAL FEATURES OF THE PROGRAM - 8.
RELATED AND AUXILIARY PROGRAMS - BETA-2B is the end-product of many modifications to BETA (reference 2).
9.
STATUS 10.
REFERENCES - 11.
MACHINE REQUIREMENTS - The amount of core storage depends on the size of the blank COMMON block, and the degree of overlay. The maxi- mum degree of program segmentation for efficient operation is given in volume 2 of reference 1. Five external storage units are required.
12.
PROGRAMMING LANGUAGE(S) USED - 13.
OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - OS for IBM 360. 14.
OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - 15.
NAME AND ESTABLISHMENT OF AUTHOR - 16.
MATERIAL AVAILABLE - 17.
CATEGORIES - Keywords: BREMSSTRAHLUNG, ELECTRONS, MONTE CARLO METHOD, TRANSPORT THEORY
Bremsstrahlung and Electron Transport Analysis.
Program-name Package-ID Status
BETA-2B CCC-0117/01 Tested
The electron transport includes the effects of fixed electric and magnetic fields and self-produced electric fields. In following both primary and knock-on electrons, energy loss straggling effects are included.
The code solves photon transport not only from bremsstrahlung sources, but also from a fixed source. The effects of incoherent and coherent (Compton) scattering, pair production and photoelectric processes are included.
BETA-2B accepts generalized source distributions that are functions of space, angle, energy and time, including sources for which both energy and intensity vary with time.
The code can treat both simple 1,2 and 3-dimensional multiple material geometries, or complex 3-dimensional quadric surface geometries.
The electron transport proceeds by calculating the length of each electron segment from a preset fractional energy loss. The electron is allowed to traverse this path and its direction and energy are altered by random sampling a multiple scattering distribution and an energy loss straggling distribution.
accuracy within 5 per cent of experimental results can be obtained for both low and high atomic number targets in the energy range from 0.05 to 15.0 MeV. The program can be applied outside this energy range, although the physical models are less accurate at lower energies.
Data arrays are packed into the blank COMMON block using variable dimensioning techniques. The length of blank COMMON is sufficient for fairly complex problems; unusually large problems, particularly those requesting many of the optional output edits,may require the storage allocation to be increased.
i) A calculation of the angle-energy distribution of an 8 MeV electron beam as it penetrates a slab of aluminium, using a P24 Goudsmit-Sanderson distribution, 2 per cent energy loss per path length segment, and following 3000 histories required 15 minutes.
ii) About 5 minutes were required to calculate the energy deposition profile for a beam of 2 MeV electrons normally incident on a semi-infinite slab of aluminium or lead. A Gaussian angular straggling model was used, with 2 per cent energy loss steps, and 500 histories were followed.
iii) A source of 10 MeV electrons, normally incident at one end of a system of concentric cylinders of aluminium, iron and tungsten with a central void was set up. Each cylinder was divided into 25 regions. The energy deposition distribution was calculated using 5 per cent energy loss steps, and following 256 histories Less than 2 minutes were required for a no-field case, 10 minutes were required with a 100,000 gauss uniform axial magnetic field.
iv) A time-dependent energy deposition calculation on a lucite cylinder require 7 minutes for 10 time steps. The electron source was normally incident and uniformly distributed on the end of the cylinder which was divided into 5 radial and 20 axial segments. 64 electron histories were followed per time step.
CCC-0117/01: 01-SEP-1977 Tested at NEADB
- Thomas J. Jordan:
BETA, A Monte-Carlo Program for Bremsstrahlung and Electron
Transport Analysis
AFWL-TR-68-III (October 1968).
CCC-0117/01:
- Thomas M. Jordan:
BETA-2, A Time-Dependent, Generalized Geometry Monte Carlo Program
for Bremsstrahlung and Electron Transport Analysis
Volume I: Summary Report, Volume II: Users Manual
A.R.T. Research Corporation Report ART-60 (October 29, 1971).
The program interfaces with the Calcomp plotting package through four entry points: PLOT, PLOTS, SYMBOL and NUMBER. If plotting is required the dummy subprograms with these names should be removed.
CCC-0117/01: FORTRAN+ASSEMBLER
Thomas J. Jordan
A.R.T. Research Corporation
1100 Glendon Avenue
Los Angeles
California 90024, USA
CCC-0117/01:
CCC0117_01.001 BETA-2B SOURCE - FORTRAN IV 13765 records
CCC0117_01.002 BETA-2B OVERLAY CARDS 79 records
CCC0117_01.003 BETA-2B JOB CONTROL 5 records
CCC0117_01.004 BETA-2B SAMPLE PROBLEM INPUT 68 records
CCC0117_01.005 BETA-2B SAMPLE PROBLEM OUTPUT 317 records
- J. Gamma Heating and Shield Design
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