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Title: Design Studies of a 3-MW, Multifrequency (170/204/236 GHz) DEMO Class Triangular Corrugated Coaxial Cavity Gyrotron
Authors: Yuvaraj S.
Kartikeyan, Machavaram Venkata
Thumm M.K.
Published in: IEEE Transactions on Electron Devices
Abstract: In this paper, the design studies of a triple frequency (170/204/236GHz) coaxial cavity gyrotron are carried out which is suitable for plasma heating application in a commercial fusion demonstration (DEMO) tokamak class prototype reactor. To reduce the spatial and maintenance requirements in the heating system of the DEMO tokamak, the output power of the proposed gyrotron is targeted at ≈3 MW for all the three operating frequencies. The cavity modes are selected by considering various physical and technical constraints of the multifrequency gyrotron. The dimensions of the interaction cavity are optimized for the chosen modes at the desired frequencies through cold-cavity calculations. Mode competition studies are then performed to understand the effect of the parasitic modes on the desired modes around the operating frequencies. A triangular corrugated coaxial insert is considered for reducing the problem of localized heating. Initial optimization of beam parameters and magnetic field is carried out using single-mode calculations for the maximum output efficiency. A triode-type coaxial magnetron injection gun is designed for supporting this multifrequency operation. Startup calculations are carried out with beam space-charge neutralization at all the three operating frequencies. These studies predict that a 3-MW, continuous-wave operation is possible at the desired frequencies of the proposed DEMO class gyrotron. © 1963-2012 IEEE.
Citation: IEEE Transactions on Electron Devices (2019), 66(1): 702-708
Issue Date: 2019
Publisher: Institute of Electrical and Electronics Engineers Inc.
Keywords: Coaxial cavity gyrotron
demonstration (DEMO) class gyrotron
multifrequency operation
space-charge neutralization
startup calculation
triangular corrugated insert
ISSN: 189383
Author Scopus IDs: 57190343042
Author Affiliations: Yuvaraj, S., Department of Electronics and Communication Engineering, IIT Roorkee, Roorkee, 247667, India
Kartikeyan, M.V., Department of Electronics and Communication Engineering, IIT Roorkee, Roorkee, 247667, India
Thumm, M.K., Institut fuer Hochleistungsimpuls und Mikrowellentechnik, Karlsruhe Institute of Technology, North Campus, Karlsruhe, 76344, Germany
Corresponding Author: Kartikeyan, M.V.; Department of Electronics and Communication Engineering, IIT RoorkeeIndia; email:
Appears in Collections:Journal Publications [ECE]

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