• Open Access

Direct measurement of the image displacement instability in a linear induction accelerator

T. J. Burris-Mog, C. A. Ekdahl, and D. C. Moir
Phys. Rev. Accel. Beams 20, 060403 – Published 19 June 2017

Abstract

The image displacement instability (IDI) has been measured on the 20 MeV Axis I of the dual axis radiographic hydrodynamic test facility and compared to theory. A 0.23 kA electron beam was accelerated across 64 gaps in a low solenoid focusing field, and the position of the beam centroid was measured to 34.3 meters downstream from the cathode. One beam dynamics code was used to model the IDI from first principles, while another code characterized the effects of the resistive wall instability and the beam break-up (BBU) instability. Although the BBU instability was not found to influence the IDI, it appears that the IDI influences the BBU. Because the BBU theory does not fully account for the dependence on beam position for coupling to cavity transverse magnetic modes, the effect of the IDI is missing from the BBU theory. This becomes of particular concern to users of linear induction accelerators operating in or near low magnetic guide fields tunes.

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  • Received 14 December 2016

DOI:https://doi.org/10.1103/PhysRevAccelBeams.20.060403

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

T. J. Burris-Mog, C. A. Ekdahl, and D. C. Moir

  • Los Alamos National Laboratory, Los Alamos New Mexico 87545, USA

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Issue

Vol. 20, Iss. 6 — June 2017

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