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Versatile, high brightness, cryogenic photoinjector electron source

River R. Robles, Obed Camacho, Atsushi Fukasawa, Nathan Majernik, and James B. Rosenzweig
Phys. Rev. Accel. Beams 24, 063401 – Published 4 June 2021

Abstract

Since the introduction of the radio-frequency (rf) photoinjector electron source over thirty years ago, peak performance demands have dictated the use of high accelerating electric fields. With recent strong advances in obtainable field values, attendant increases in beam brightness are expected to be dramatic. In this article, we examine the implementation of very high gradient acceleration in a high frequency, cryogenic rf photoinjector. We discuss in detail the effects of introducing, through an optimized rf cavity shape, rich spatial harmonic content in the accelerating modes in this device. Higher spatial harmonics give useful, enhanced linear focusing effects, as well as potentially deleterious nonlinear transverse forces. They also serve to strongly increase the ratio of average accelerating field to peak surface field, thus aiding in managing power and dark current-related challenges. We investigate two scenarios which are aimed at unique exploitation of the capabilities of this source. First, we investigate the obtaining of extremely high six-dimensional brightness for advanced free-electron laser applications. We also examine the use of a magnetized photocathode in the device for producing unprecedented low asymmetric emittance, high-current electron beams that reach linear collider-compatible performance. As both of the scenarios demand an advanced, compact solenoid design, we describe a novel cryogenic solenoid system. With the high field rf and magnetostatic structures introduced, we analyze the collective beam dynamics in these systems through theory and multiparticle simulations, including a particular emphasis on granularity effects associated with microscopic Coulomb interactions.

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  • Received 16 March 2021
  • Accepted 25 May 2021

DOI:https://doi.org/10.1103/PhysRevAccelBeams.24.063401

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

River R. Robles*,†, Obed Camacho, Atsushi Fukasawa, Nathan Majernik, and James B. Rosenzweig

  • Department of Physics and Astronomy, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095, USA

  • *riverr@stanford.edu
  • Present address: Department of Applied Physics, Stanford University, Stanford, California 94305, USA.

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Vol. 24, Iss. 6 — June 2021

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