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New trends of gyrotron development at KIT: An overview on recent investigations
摘要： Since many years KIT is strongly involved in the development of high power gyrotrons for use in ECRH. KIT is pursuing two development lines: (i) the conventional, hollow cavity gyrotron and (ii) the coaxial cavity gyrotron. KIT is pushing conventional cavity gyrotrons from 1 MW to 1.5 MW in a common project with IPP Greifswald. Coaxial cavity technology having the advantage of higher power capability, in particular at higher frequency, is used for the 2 MW 170 GHz short-pulse prototype. This gyrotron is currently being upgraded to allow pulse extension up to approximately 100 ms and up to 1 s in a second step. For a future DEMOnstration fusion power plant two challenging trends with respect to gyrotron features are recognized: (a) the operating frequency will be above 200 GHz and (b) the requested total efficiency of the gyrotron should be higher than 60%. KIT is addressing these requirements by investigating both gyrotron technologies for their performance at a frequency well above 200 GHz. We started careful analysis of multi-staged-depressed collectors.
关键词： Electron-cyclotron-resonance heating and current drive,Gyrotron,Coaxial cavity,Magnetron injection gun
更新于2025-09-23 15:23:52
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Design Studies of a 3-MW, Multifrequency (170/204/236 GHz) DEMO Class Triangular Corrugated Coaxial Cavity Gyrotron
摘要： In this paper, the design studies of a triple frequency (170/204/236 GHz) 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 ?eld is carried out using single-mode calculations for the maximum output ef?ciency. 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.
关键词： demonstration (DEMO) class gyrotron,multifrequency operation,triangular corrugated insert,space-charge neutralization,Coaxial cavity gyrotron,startup calculation
更新于2025-09-10 09:29:36
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[IEEE 2017 14th IEEE India Council International Conference (INDICON) - Roorkee (2017.12.15-2017.12.17)] 2017 14th IEEE India Council International Conference (INDICON) - Design of a Magnetron Injection Gun for a 4 MW, 170 GHz, Coaxial Cavity Gyrotron
摘要： In this paper, design of a Magnetron Injection Gun (MIG) for a 4 MW, 170 GHz coaxial cavity gyrotron is presented. The operating mode is chosen as TE52,31. A triode configured coaxial MIG is designed for the generation of the annular electron beam with the desired beam parameters. The supporting magnetic guidance system is also designed. The initial gun design parameters are obtained using our in-house code Gyrotron Design Suite version 4.1 2016 (GDSv4.1 2016) and the geometry of the MIG is finally optimized through particle trajectory code ESRAY.
关键词： Coaxial Cavity Gyrotron,Magnetron Injection Gun (MIG),Magnetic Guidance System
更新于2025-09-09 09:28:46