Operation of high power 84-GHz gyrotron for KSTAR ECH system

Author

Bae, Y.S. ; Lee, H.K. ; Jeong, J.H. ; Namkung, W. ; Cho, M.H. ; Chu, S.

Author_Institution

Pohang Univ. of Sci. & Technol., South Korea

fYear

2003

fDate

28-30 May 2003

Firstpage

38

Lastpage

39

Abstract

The initial objective of the KSTAR ECH system is to produce seed plasmas by irradiation of powerful millimeter waves for the main ohmic discharges. A specially designed gyrotron, manufactured by CPI, has specifications of 500 kW, 84 GHz, and 2- second pulse duration. It adopts the state-of-arts technologies of a diode gun, a depressed potential collector, an internal mode converter, and a diamond window. As a part of the final acceptance tests of the gyrotron, we constructed a test and including a test modulator to confirm its operating conditions. With short-pulses of 20 microseconds, we produced the output peak power of 500 kW at 84 GHz. The output power distribution is confirmed to be a Gaussian by IR images on targets. In this experimental study, we describe details of the gyrotron, the test stand, and experimental results.

Keywords

Tokamak devices; cyclotrons; gyrotrons; infrared imaging; millimetre waves; plasma ohmic heating; plasma radiofrequency heating; 20 ms; 500 kW; 84 GHz; IR images; Korea superconducting Tokamak advanced reactor; depressed potential collector; diamond window; diode gun; electron cyclotron heating; high power gyrotron; internal mode converter; millimeter waves; ohmic discharges; Diodes; Gyrotrons; Manufacturing; Millimeter wave technology; Nuclear and plasma sciences; Plasma materials processing; Plasma waves; Radio frequency; Sun; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics, 2003 4th IEEE International Conference on

Print_ISBN

0-7803-7699-4

Type

conf

DOI

10.1109/IVEC.2003.1286025

Filename

1286025