Simulation results of corkscrew motion in DARHT-II

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DARHT-II, the second axis of the Dual-Axis Radiographic Hydrodynamics Test Facility, is being commissioned. DARHT-II is a linear induction accelerator producing 2-microsecond electron beam pulses at 20 MeV and 2 kA. These 2-microsecond pulses will be chopped into four short pulses to produce time resolved x-ray images. Radiographic application requires the DARHT-II beam to have excellent beam quality, and it is important to study various beam effects that may cause quality degradation of a DARHT-II beam. One of the beam dynamic effects under study is 'corkscrew' motion. For corkscrew motion, the beam centroid is deflected off axis due to misalignments ... continued below

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4 p.

Creation Information

Chan, K. D. (Kwok-Chi D.); Ekdahl, C. A. (Carl A.); Chen, Y. J. (Yu-Jiuan) & Hughes, T. P. (Thomas P.) January 1, 2003.

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Description

DARHT-II, the second axis of the Dual-Axis Radiographic Hydrodynamics Test Facility, is being commissioned. DARHT-II is a linear induction accelerator producing 2-microsecond electron beam pulses at 20 MeV and 2 kA. These 2-microsecond pulses will be chopped into four short pulses to produce time resolved x-ray images. Radiographic application requires the DARHT-II beam to have excellent beam quality, and it is important to study various beam effects that may cause quality degradation of a DARHT-II beam. One of the beam dynamic effects under study is 'corkscrew' motion. For corkscrew motion, the beam centroid is deflected off axis due to misalignments of the solenoid magnets. The deflection depends on the beam energy variation, which is expected to vary by {+-}0.5% during the 'flat-top' part of a beam pulse. Such chromatic aberration will result in broadening of beam spot size. In this paper, we will report simulation results of our study of corkscrew motion in DARHT-II. Sensitivities of beam spot size to various accelerator parameters and the strategy for minimizing corkscrew motion will be described. Measured magnet misalignment is used in the simulation.

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4 p.

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  • Submitted to: Particle Accelerator Conference 2003, Portland, OR, May 12-16, 2003

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  • Report No.: LA-UR-03-2937
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976634
  • Archival Resource Key: ark:/67531/metadc930534

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  • January 1, 2003

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 4:49 p.m.

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Chan, K. D. (Kwok-Chi D.); Ekdahl, C. A. (Carl A.); Chen, Y. J. (Yu-Jiuan) & Hughes, T. P. (Thomas P.). Simulation results of corkscrew motion in DARHT-II, article, January 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc930534/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.