Beam Transport Issues in High Current Linear Accelerators

Miller, Robert B.; Poukey, J. W.; Epstein, B. G.; Shope, S.L.; Genoni, T. C.; Franz, Mark Richard; Godfrey, Brendan B.; Adler, R. J.; Mondelli, A.

doi:10.1109/tns.1981.4332100

Cited by 10 publications

(1 citation statement)

References 7 publications

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“…Using two beam dynamics codes, we compare measurement and theory and explore the relationship between the IDI and the BBU instability [13][14][15][16][17][18]. The first code, XTR [19], was designed to model the transport of electron beams on Axis I.…”

Section: Isolating the Idimentioning

confidence: 99%

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

Burris-Mog

Ekdahl

Moir

2017

Phys. Rev. Accel. Beams

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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 breakup (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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