Beam Envelope Stability in an Advanced Linear Induction Accelerator

Journal Article · 23 September 2021 · IEEE Transactions on Plasma Science

DOI: https://doi.org/10.1109/tps.2021.3112511 · OSTI ID:1830597

Ekdahl, Carl August Jr.  ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

A new linear induction accelerator (LIA) is under development for multipulse flash radiography. Because it has substantially more cells than present LIAs, higher magnetic focusing fields are needed to suppress beam breakup (BBU). It is, therefore, more susceptible to the parametric beam envelope instability (PEI), which has an instability threshold that has usually been typified by the vacuum phase advance per cell exceeding some large fraction of π . Here we derive a threshold criterion for PEI that depends not only on the magnetic field, but also on the beam space charge and emittance. A tune designed to suppress BBU in Scorpius is shown to be stable to the PEI according to this criterion, and also by the lack of emittance growth in particle-in-cell (PIC) code simulations.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: 89233218CNA000001
• OSTI ID: 1830597
• Report Number(s): LA-UR--21-24588
• Journal Information: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 10 Vol. 49; ISSN 0093-3813
• Publisher: IEEECopyright Statement
• Country of Publication: United States
• Language: English