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Title	Frequency Tuning System Based on Mobile Plungers For Superconductive Coaxial Half Wave Resonators
Authors	D. Bychanok, S. Huseu, S.A. Maksimenko INP BSU, Minsk, Belarus A.V. Butenko, E. Syresin JINR, Dubna, Moscow Region, Russia E.A. Gurnevich Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus M. Gusarova, M.V. Lalayan, S.M. Polozov MEPhI, Moscow, Russia
Abstract	The design of a prototype of the frequency tuning system (FTS) for superconductive coaxial half wave cavities (HWR) [1] developed for the Nuclotron-based Ion Collider fAcility (NICA) injector is presented. The proposed system is based on mobile plungers placed in the technological holes in the end caps of the resonator. The FTS allows controlling the penetration depth of plungers, which is monotonically related to the resonant frequency shift of the cavity. The developed FTS includes slow/fast tuner parts and is more compact and simple in comparison to traditional mechanical systems, which deform reversibly the HWR by applying an effort on the beam ports [2]. The similar plunger-based tuner design was considered for QWR cavities in [3]. The results of numerical simulations of the resonant frequency for a wide range of plunger parameters are presented and discussed. The most important parameters for effective frequency shift are estimated.
Footnotes & References	[1] S. Matsievskiy et al., RuPAC’18. doi:10.18429/JACoW-RUPAC2018-WEPSB48 [2] N. Misiara et al., LINAC’16. doi:10.18429/JACoW-LINAC2016-MOPRC026 [3] D. Longuevergne et al., ‘‘A cold tuner system with mobile plunger’’, in Proc. SRF2013, paper THIOD04.
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Conference	SRF2019
Series	International Conference on RF Superconductivity (19th)
Location	Dresden, Germany
Date	30 June-05 July 2019
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Peter Michel (HZDR, Dresden, Germany); André Arnold (HZDR, Dresden, Germany); Volker RW Schaa (GSI, Darmstadt, Germany)
Online ISBN	978-3-95450-211-0
Online ISSN	""
Received	22 June 2019
Accepted	30 June 2019
Issue Date	14 August 2019
DOI	doi:10.18429/JACoW-SRF2019-TUP086
Pages	664-666
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.