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Title: Charged Particle Radiography for MaRIE

  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: P/T Colloquium ; 2016-09-01 - 2016-09-01 ; Los Alamos, New Mexico, United States
Country of Publication:
United States

Citation Formats

Merrill, Frank Edward. Charged Particle Radiography for MaRIE. United States: N. p., 2016. Web.
Merrill, Frank Edward. Charged Particle Radiography for MaRIE. United States.
Merrill, Frank Edward. 2016. "Charged Particle Radiography for MaRIE". United States. doi:.
title = {Charged Particle Radiography for MaRIE},
author = {Merrill, Frank Edward},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9

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  • In proton radiography, imaging with systems consisting of quadrupole magnets is an established technique for viewing the material distribution and composition of objects, either statically or during fast events such as explosions. With the standard magnet configuration, the -I lens, chromatic aberrations generally dominate the image blur. Image resolution can be improved, and largely decoupled from the input-beam parameters, by using a second-order achromat with some additional higher-order aberration correction. The aberration-correction approach is discussed. For a given resolution, such an achromat allows use of much lower-energy imaging particles than a -I lens. Each achromat design can be scaled intomore » many equivalent systems; an 800-MeV proton design and its equivalent 40-MeV electron system are presented. The electron system is useful for imaging thin objects. Magnet errors in the achromats must be tightly controlled to preserve image quality, but not beyond feasibility of present technology. System performance is verified by particle tracking. Configurations alternative to the canonical achromat are discussed.« less
  • Radiations other than those of the electromagnetic spectrum or of sound may be used for diagnosis. These consist of beams of sub-atomic particles, particularly of protons and heavy ions. With these beams radiographs of unusually high contrast are obtained for the visualization and differentiation of the bodily tissues at very low doses. The method is practical for use in hospitals and has potential for screening purposes.
  • The purpose of the Matter-Radiation Interactions in Extremes (MaRIE) facility at Los Alamos National Laboratory is to investigate the performance limits of materials in extreme environments. The MaRIE facility will utilize a 12 GeV linac to drive an X-ray Free-Electron Laser (FEL). Most of the same linac will also be used to perform electron radiography. The main linac is driven by two shorter linacs; one short linac optimized for X-FEL pulses and one for electron radiography. The RF systems have historically been the one of the largest single component costs of a linac. We will describe the details of themore » different types of RF systems required by each part of the linacs. Starting with the High Power RF system, we will present our methodology for the choice of RF system peak power and pulselength with respect to klystron parameters, modulator parameters, performance requirements and relative costs. We will also present an overview of the Low Level RF systems that are proposed for MaRIE and briefly describe their use with some proposed control schemes.« less
  • Charged-particle transport systems consisting of magnetic quadrupole lenses have been employed in recent years in the study of (n, charged particle) reactions. We have completed a new transport system that is based both on magnetic lenses as well as electrostatic fields. The magnetic focusing of this charged-particle guide is provided by six magnetic quadrupole lenses arranged in a CDCCDC sequence (in the vertical plane). The electrostatic field is produced by a wire at high voltage which stretches the length of the guide and is physically at the center of the magnetic axis. The magnetic lenses are used for charged particlesmore » above 5 MeV; the electrostatic guide is used for lower energies. This hybrid system possesses the excellent focusing and background rejection properties of other magnetic systems. For low energy charged-particles, the electrostatic transport avoids the narrow band-passes in charged-particle energy which are a problem with purely magnetic transport systems. This system is installed at the LLNL Cyclograaff facility for the study of (n, charged particle) reactions at neutron energies up to 35 MeV.« less