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Title: Inductive voltage adder advanced hydrodynamic radiographic technology demonstration

Abstract

This paper presents the design, results, and analysis of a high-brightness electron beam technology demonstration experiment completed at Sandia National Laboratories, performed in collaboration with Los Alamos National Laboratory. The anticipated electron beam parameters were: 12 MeV, 35-40 kA, 0.5-mm rms radius, and 40-ns full width half maximum (FWHM) pulse duration. This beam, on an optimum thickness tantalum converter, should produce a very intense x-ray source of {approximately} 1.5-mm spot size and 1 kR dose @ 1 m. The accelerator utilized was SABRE, a pulsed inductive voltage adder, and the electron source was a magnetically immersed foilless electron diode. For these experiments, SABRE was modified to high-impedance negative-polarity operation. A new 100-ohm magnetically insulated transmission line cathode electrode was designed and constructed; the cavities were rotated 180{degrees} poloidally to invert the central electrode polarity to negative; and only one of the two pulse forming lines per cavity was energized. A twenty- to thirty-Tesla solenoidal magnet insulated the diode and contained the beam at its extremely small size. These experiments were designed to demonstrate high electron currents in submillimeter radius beams resulting in a high-brightness high-intensity flash x-ray source for high-resolution thick-object hydrodynamic radiography. The SABRE facility high-impedance performance was lessmore » than what was hoped. The modifications resulted in a lower amplitude (9 MV), narrower-than-anticipated triangular voltage pulse, which limited the dose to {approximately} 20% of the expected value. In addition, halo and ion-hose instabilities increased the electron beam spot size to > 1.5 mm. Subsequent, more detailed calculations explain these reduced output parameters. An accelerator designed (versus retrofit) for this purpose would provide the desired voltage and pulse shape.« less

Authors:
; ; ;  [1]
  1. and others
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
469135
Report Number(s):
SAND-97-0816
ON: DE97005330; TRN: 97:010315
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1997
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LINEAR ACCELERATORS; DESIGN; X-RAY RADIOGRAPHY; HYDRODYNAMICS; ELECTRON BEAMS; IMPEDANCE; COMPUTERIZED SIMULATION; BEAM PROFILES; X-RAY SOURCES

Citation Formats

Mazarakis, M. G., Poukey, J. W., Maenchen,, and Rovang, D. C. Inductive voltage adder advanced hydrodynamic radiographic technology demonstration. United States: N. p., 1997. Web. doi:10.2172/469135.
Mazarakis, M. G., Poukey, J. W., Maenchen,, & Rovang, D. C. Inductive voltage adder advanced hydrodynamic radiographic technology demonstration. United States. https://doi.org/10.2172/469135
Mazarakis, M. G., Poukey, J. W., Maenchen,, and Rovang, D. C. Tue . "Inductive voltage adder advanced hydrodynamic radiographic technology demonstration". United States. https://doi.org/10.2172/469135. https://www.osti.gov/servlets/purl/469135.
@article{osti_469135,
title = {Inductive voltage adder advanced hydrodynamic radiographic technology demonstration},
author = {Mazarakis, M. G. and Poukey, J. W. and Maenchen, and Rovang, D. C.},
abstractNote = {This paper presents the design, results, and analysis of a high-brightness electron beam technology demonstration experiment completed at Sandia National Laboratories, performed in collaboration with Los Alamos National Laboratory. The anticipated electron beam parameters were: 12 MeV, 35-40 kA, 0.5-mm rms radius, and 40-ns full width half maximum (FWHM) pulse duration. This beam, on an optimum thickness tantalum converter, should produce a very intense x-ray source of {approximately} 1.5-mm spot size and 1 kR dose @ 1 m. The accelerator utilized was SABRE, a pulsed inductive voltage adder, and the electron source was a magnetically immersed foilless electron diode. For these experiments, SABRE was modified to high-impedance negative-polarity operation. A new 100-ohm magnetically insulated transmission line cathode electrode was designed and constructed; the cavities were rotated 180{degrees} poloidally to invert the central electrode polarity to negative; and only one of the two pulse forming lines per cavity was energized. A twenty- to thirty-Tesla solenoidal magnet insulated the diode and contained the beam at its extremely small size. These experiments were designed to demonstrate high electron currents in submillimeter radius beams resulting in a high-brightness high-intensity flash x-ray source for high-resolution thick-object hydrodynamic radiography. The SABRE facility high-impedance performance was less than what was hoped. The modifications resulted in a lower amplitude (9 MV), narrower-than-anticipated triangular voltage pulse, which limited the dose to {approximately} 20% of the expected value. In addition, halo and ion-hose instabilities increased the electron beam spot size to > 1.5 mm. Subsequent, more detailed calculations explain these reduced output parameters. An accelerator designed (versus retrofit) for this purpose would provide the desired voltage and pulse shape.},
doi = {10.2172/469135},
url = {https://www.osti.gov/biblio/469135}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {4}
}