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Electromagnetic design of 325 MHz superconducting single-spoke resonators for Indian Facility for Spallation Research

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Abstract

We present an electromagnetic design of 325 MHz superconducting single-spoke resonators (SSRs) to accelerate the \(\hbox {H}^{-}\) ions from 3 to \(\sim \!\!160\) MeV for the proposed Indian Facility for Spallation Research project. The geometrical parameters of SSRs have been optimised to maximise the achievable acceleration gradient, and to minimise the multipacting growth rate, keeping a reasonably low value of heat dissipation on the cavity surface. For the geometrical optimisation of SSR cavities, we followed a one-dimensional procedure, where we vary and fix the geometrical parameters one by one in a sequential manner. We explain the behaviour of various RF parameters of the SSR with respect to its geometrical parameters, based on which the optimum value of each of the geometrical parameters has been chosen. For the optimised geometry of SSRs, we performed the higher-order mode (HOM) analysis and estimated the transverse and longitudinal kicks imparted to the beam by HOMs. The effect of azimuthal asymmetry of the electromagnetic field is also analysed and presented for the adopted design. A holistic design approach is described in the paper that addresses the interlinked optimisation requirements.

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Authors and Affiliations

  1. Raja Ramanna Centre for Advanced Technology, Indore, 452 013, India

    Mukesh Kumar Pal, Rahul Gaur & Vinit Kumar

  2. Homi Bhabha National Institute, Mumbai, 400 094, India

    Rahul Gaur & Vinit Kumar

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  1. Mukesh Kumar Pal
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  2. Rahul Gaur
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  3. Vinit Kumar
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Correspondence to Rahul Gaur.

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Pal, M.K., Gaur, R. & Kumar, V. Electromagnetic design of 325 MHz superconducting single-spoke resonators for Indian Facility for Spallation Research. Pramana - J Phys 96, 69 (2022). https://doi.org/10.1007/s12043-022-02311-4

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  • DOI: https://doi.org/10.1007/s12043-022-02311-4

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