Low Inductance pulser system drives a fast magnet at DARHT.

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The DARHT facility [Dual Axis Radiographic Hydrodynamic Test] uses bremsstrahlung radiation from focused electron beams to produce radiographs. To produce a smaller spot size and, thus, a higher quality radiograph, one must be able to control the emittance of the electron beam. To that end, it is necessary to measure emittance. Emittance is measured by focusing the electron beam to a small size, such that the size is dominated by the emittance, as opposed to the space charge. Our electron beam, at 2 kA, 18 MV and 2 ps, would destroy any imaging target, were the full beam to be ... continued below

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4 p.

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Rose, E. A. (Evan A.); Bartsch, R. R. (Robert Richard); Custer, D. M. (Daniel M.); Ekdahl, C. A. (Carl A.); Montoya, R. R. (Robert R.) & Smith, J. R. (John R.) January 1, 2002.

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The DARHT facility [Dual Axis Radiographic Hydrodynamic Test] uses bremsstrahlung radiation from focused electron beams to produce radiographs. To produce a smaller spot size and, thus, a higher quality radiograph, one must be able to control the emittance of the electron beam. To that end, it is necessary to measure emittance. Emittance is measured by focusing the electron beam to a small size, such that the size is dominated by the emittance, as opposed to the space charge. Our electron beam, at 2 kA, 18 MV and 2 ps, would destroy any imaging target, were the full beam to be focused to minimal spot size for the full beam duration. The solution is to focus the beam for a short duration, a few tens of nanoseconds, using a fast solenoid magnet. This paper reports details of the pulsed power system used to drive the segmented magnet. The system consists of twenty pulsers, driving 60 cables to feed two headers on the magnet. The magnet itself consists of 12 individual loops, each segmented in three parts, for inductance reduction. The system is designed to produce one kilogauss over a 15-cm diameter and 60-cm length. The pulsers incorporate spark gaps that produce the main pulse with a half sine period of 125 ns and also clip the tail of the pulse to prevent refocusing of the beam. A five-to-one ratio between the first and second current peaks has been demonstrated [same polarity peaks].

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4 p.

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  • "Submitted to: 2002 International Power Modulator Conference, June 30-July 3, 2002 Hollywood, CA"

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  • Report No.: LA-UR-02-5195
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976297
  • Archival Resource Key: ark:/67531/metadc932836

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 2002

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:22 p.m.

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Rose, E. A. (Evan A.); Bartsch, R. R. (Robert Richard); Custer, D. M. (Daniel M.); Ekdahl, C. A. (Carl A.); Montoya, R. R. (Robert R.) & Smith, J. R. (John R.). Low Inductance pulser system drives a fast magnet at DARHT., article, January 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc932836/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.