Author: Rao, X.
Paper Title Page
WEPA48 Electromagnetic Design of a Compact RF Chopper for Heavy-Ion Beam Separation at FRIB 738
  • A.C. Araujo Martinez, R.B. Agustsson, Y.C. Chen, S.V. Kutsaev
    RadiaBeam, Santa Monica, California, USA
  • A.S. Plastun, X. Rao
    FRIB, East Lansing, Michigan, USA
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under SBIR grant DE- SC0020671.
Rare isotope beams are produced at FRIB via fragmentation of a primary heavy ion beam in a thin target. The isotope beam of interest is contaminated with other fragments, which must be filtered out to ensure the delivery of rare isotopes with desired rates and purities. One of the stages of fragment separation uses an RF deflecting cavity to provide time-of-flight separation. However, to avoid neighboring bunches overlapping with each other and with the contaminants, it is necessary to increase the inter-bunch distance by a factor of four, corresponding to a 20.125 MHz rate. To solve this problem, we have developed an RF chopper system for the 500 keV/u primary heavy-ion beams. The system consists of a deflecting quarter wave resonator (QWR) cavity operating at 60.375 MHz, two dipole steering magnets, and a beam dump. In this paper, we present and discuss the optimization of the electromagnetic design of the QWR cavity and magnets, as well as some aspects, related to beam dynamics and conceptual engineering design.
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA48  
About • Received ※ 02 August 2022 — Revised ※ 05 August 2022 — Accepted ※ 06 August 2022 — Issue date ※ 08 September 2022
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