Keyword: LEBT
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MOXZO02 Conceptual Design of Heavy Ion ToF-ERDA Facility Based on Permanent Magnet ECRIS and Variable Frequency RFQ Accelerator rfq, ECR, ECRIS, ion-source 21
 
  • O.A. Tarvainen, D.C. Faircloth, A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • J. Julin, T. Kalvas
    JYFL, Jyväskylä, Finland
 
  Ion beam analysis is typically based on tandem accelerators and negative ions. The required 5-20 MeV energies for heavy ion time-of-flight elastic recoil detection analysis* (ToF-ERDA) can be achieved with a high charge state ion source and RFQ accelerator. We present a conceptual design of a ToF-ERDA facility based on a permanent magnet ECRIS and variable frequency RFQ accelerating 1-10 pnA of 40Ar8+, 84Kr17+ and 129Xe24+ ions to 4-7, 10-15 and 13-20 MeV. We present the PM ECRIS requirements focusing on the CUBE-ECRIS** with a quadrupole min-B field topology. Beam dynamics studies demonstrating good transmission of the heavy ion beams from the ion source to the RFQ entrance through the electrostatic low energy beam transport (LEBT) and a permanent magnet dipole are presented. The predicted LEBT transmissions of the CUBE-ECRIS (rectangular extraction slit) and a conventional ECRIS (circular extraction aperture) are compared. The conceptual design of the RFQ is described and the implications of the energy spread on the high energy beam transport are discussed. It is demonstrated that an energy spread below 0.2 % is necessary for appropriate resolution of the heavy ion ToF-ERDA.
* J. Julin and T. Sajavaara, Nucl. Instrum. Methods Phys. Res. B 406, Part A, (2017), pp 61-65.
** T. Kalvas, O. Tarvainen, V. Toivanen and H. Koivisto, 2020 JINST 15 P06016.
 
slides icon Slides MOXZO02 [10.204 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOXZO02  
About • Received ※ 25 September 2020 — Revised ※ 28 September 2020 — Accepted ※ 14 December 2020 — Issue date ※ 18 May 2021
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