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Title: Charged Particle Radiography-a new way to look inside of things.

Abstract

This report is a description of charged particle radiography.

Authors:
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1364561
Report Number(s):
LA-UR-17-24797
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; proton radiography

Citation Formats

Morris, Christopher. Charged Particle Radiography-a new way to look inside of things.. United States: N. p., 2017. Web. doi:10.2172/1364561.
Morris, Christopher. Charged Particle Radiography-a new way to look inside of things.. United States. doi:10.2172/1364561.
Morris, Christopher. Wed . "Charged Particle Radiography-a new way to look inside of things.". United States. doi:10.2172/1364561. https://www.osti.gov/servlets/purl/1364561.
@article{osti_1364561,
title = {Charged Particle Radiography-a new way to look inside of things.},
author = {Morris, Christopher},
abstractNote = {This report is a description of charged particle radiography.},
doi = {10.2172/1364561},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jun 14 00:00:00 EDT 2017},
month = {Wed Jun 14 00:00:00 EDT 2017}
}

Technical Report:

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  • This grant provides partial support for the purchase and fabrication of a vacuum-chamber facility to be used in the calibration of electron and ion detectors. The detectors are space-flight instruments that will be flown aboard sound rockets and future shuttle missions to study the physics of charged-particle-beam emission in the upper ionosphere and the dumping of trapped radiation by low-frequency radio transmitter and lightning strokes.
  • The process by which super-thermal ions slow down against background Coulomb potentials arises in many fields of study. In particular, this is one of the main mechanisms by which the mass and energy from the reaction products of fusion reactions is deposited back into the background. Many of these fields are characterized by length and time scales that are the same magnitude as the range and duration of the trajectory of these particles, before they thermalize into the background. This requires numerical simulation of this slowing down process through numerically integrating the velocities and energies of these particles. This papermore » first presents a simple introduction to the required plasma physics, followed by the description of the numerical integration used to integrate a beam of particles. This algorithm is unique in that it combines in an integrated manner both a second-order integration of the slowing down with the particle beam dispersion. These two processes are typically computed in isolation from each other. A simple test problem of a beam of alpha particles slowing down against an inert background of deuterium and tritium with varying properties of both the beam and the background illustrate the utility of the algorithm. This is followed by conclusions and appendices. The appendices define the notation, units, and several useful identities.« less
  • A new magnetic pick-up probe of feedback type to measure the total intensity of charged particle beams was designed and successfully applied to a linac beam. A beam is passed through the window of a magnetic core and is detected and amplified by a pick-up coil wound on the core. The current generator feedbacks negatively this amplified signal to another coil wound on the same core. The voltage generated across a resistor with this feedback current is proportional to the passing beam and serves as a measure of the beam intensity. For a beam of l ma, the output voltagemore » can be made to 1 volt, and the time constant can be varied for different beams. This probe is superior to other magnetic probes and also to electrical probes..(D.L.C.)« less
  • Morel (1981) has developed multigroup Legendre cross sections suitable for input to standard discrete ordinates transport codes for performing charged-particle Fokker-Planck calculations in one-dimensional slab and spherical geometries. Since the Monte Carlo neutron transport code, MORSE, uses the same multigroup cross section data that discrete ordinates codes use, it was natural to consider whether Fokker-Planck calculations could be performed with MORSE. In order to extend the unique three-dimensional forward or adjoint capability of MORSE to Fokker-Planck calculations, the MORSE code was modified to correctly treat the delta-function scattering of the energy operator, and a new set of physically acceptable crossmore » sections was derived to model the angular operator. Morel (1979) has also developed multigroup Legendre cross sections suitable for input to standard discrete ordinates codes for performing electron Boltzmann calculations. These electron cross sections may be treated in MORSE with the same methods developed to treat the Fokker-Planck cross sections. The large magnitude of the elastic scattering cross section, however, severely increases the computation or run time. It is well-known that approximate elastic cross sections are easily obtained by applying the extended transport (or delta function) correction to the Legendre coefficients of the exact cross section. An exact method for performing the extended transport cross section correction produces cross sections which are physically acceptable. Sample calculations using electron cross sections have demonstrated this new technique to be very effective in decreasing the large magnitude of the cross sections.« less