High frequency gyrotrons and their application to tokamak plasma heating

High Frequency Gyrotrons and Their Application to Tokamak Plasma Heating

High frequency (> 200 GHz) gyrotrons are potentially useful for several important applications, including plasma heating and radar. For electron cyclotron resonance heating of a moderate-size, high power density tokamak power reactor to ignition temperatures, a gyrotron frequency around 200 GHz appears to be necessary. The design of high frequency gyrotrons is discussed. Analysis of overall gyr...

Resonant Parametric Excitation in Lower-hybrid Heating of Tokamak Plasma*

Power in Plasma RF heating in a tokamak cavity 1

We consider the problem of computing the global response of a tokamak to RF-antenna driving, including conversion at the ion-hybrid resonance layer. The tokamak is modeled as a 2-D circular cavity (a poloidal cross-section). An antenna launches a family of magnetosonic (MS) rays. The amplitude and phase of the MS wave eld are transported using eikonal techniques: the phase is transported using ...

Development of terahertz gyrotrons and their application to CTS on LHD

Development of a high-power, sub terahertz pulse gyrotron has started in FIR FU for application to CTS on LHD. A new electron gun was designed to produce a laminar electron beam with a good quality. Second harmonic TE6,5 and TE8,5 modes were selected as oscillation modes well isolated from other competing modes. Single mode oscillation has been confirmed for both TE6,5 and TE8,5 modes. The maxi...

Design Study of a Tokamak Power Reactor with an Electron Cyclotron Resonance Heating System

A detailed design is presented of a tokamak power reactor with an electron cyclotron resonance heating system. Major research topics include: physics constraints imposed on the design of a reactor by the ECR wave absorption conditions; design of the high frequency (200 GHz) gyrotrons needed for plasma heating; the gyrotron power and magnet systems; a microwave transmission system in oversize wa...