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Design of a spiral inflector and transverse beam matching for K130 cyclotron at the Variable Energy Cyclotron Centre

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Abstract

This paper describes the design of a spiral inflector for inflecting heavy ion beams into the existing central region of the \(\text {K} = 130\) Variable Energy Cyclotron at Kolkata. Simulation results of transverse beam dynamics through the spiral inflector and the effect of the fringe field on beam phase ellipses at its exit have been discussed in the absence of space charge effect. We have also made an effort to minimise the effect of inflector fringe field by properly adjusting the inflector voltage. The proper matching conditions in the central region have been obtained by optimising the system parameters of the existing axial injection line of K130 cyclotron. The tracking of particles that belong to the boundary of the optimised phase ellipses at the matching point has also been carried out in the computed electric and magnetic fields in the central region. Simulation results confirm that the optimised beam condition reduces beam losses for further acceleration in the cyclotron.

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Acknowledgements

The authors would like to express their sincere gratitude to Shri Amitava Roy and Dr Arup Bandyopadhyay of VECC, for their encouragement and support to this work. The authors would also like to thank Shri P S Chakraborty, Dr P Y Nabhiraj, Shri Suvadeep Roy and Shri C Nandi for providing information on the K130 cyclotron and its injection line.

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Authors and Affiliations

  1. Variable Energy Cyclotron Centre, 1 / AF, Bidhan Nagar, Kolkata,  700 064, India

    A Goswami, Atanu Dutta & Santanu Paul

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

    A Goswami & Santanu Paul

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  1. A Goswami
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  2. Atanu Dutta
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Correspondence to A Goswami.

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Goswami, A., Dutta, A. & Paul, S. Design of a spiral inflector and transverse beam matching for K130 cyclotron at the Variable Energy Cyclotron Centre. Pramana - J Phys 93, 15 (2019). https://doi.org/10.1007/s12043-019-1778-3

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  • DOI: https://doi.org/10.1007/s12043-019-1778-3

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