High power operation of Gaussian beam gyrotron with CVD diamond window for JT-60U

Journal Article · Mon Sep 20 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59706· OSTI ID:21210505

Kasugai, Atsushi; Takahashi, Koji; Sakamoto, Keishi; Ikeda, Yukiharu; Ikeda, Yoshitaka; Tsuneoka, Masaki ^[1]; Kariya, Tsuyoshi; Mitsunaka, Yoshika ^[2]; Imai, Tsuyoshi

---

1. RF Heating Laboratory, Naka Fusion Research Establishment, Japan Atomic Energy Research Institute (JAERI), Naka-machi, Ibaraki-ken, Japan 311-0193 (Japan)
2. Electron Tubes and Devices Division, Toshiba Corporation, Ohtawara-shi, Tochigi, 324-8550 (Japan)

A 110 GHz-Gaussian beam output gyrotron with CVD (Chemical Vapor Deposition) diamond window was developed for the electron cyclotron heating and current drive on JT-60U. A stable Gaussian output beam power of 1.1 MW-0.1 s was obtained with the efficiency of 39% with depressed collector operation. Due to Gaussian beam output from the gyrotron, the coupling efficiency to HE11 mode in the mirror optical unit was 94%. Moreover, the transmission efficiency of 89% for HE11 mode was performed at the power level of 1 MW on the 40 m-transmission test line of {phi}31.751 mm corrugated waveguide and 8-miter bends included 1-pair of polarizer. The gyrotron and transmission line were installed into JT-60U system and 0.6 MW-0.3 s power was successfully injected into JT-60U plasmas as an initial operation.

• OSTI ID: 21210505
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 485; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHEMICAL VAPOR DEPOSITION
COUPLING
DIAMONDS
ECR CURRENT DRIVE
ECR HEATING
EFFICIENCY
GHZ RANGE
JT-60U TOKAMAK
MICROWAVE AMPLIFIERS
MIRRORS
OPERATION
PLASMA
POWER TRANSMISSION LINES
RF SYSTEMS
WAVEGUIDES