45 GHz/20 kW gyrotron-based system for ECR ION source

• Published in: 2016 IEEE International Conference on Plasma Science (ICOPS) p. 1
• Main Authors: Denisov, Grigory G., Bykov, Yury V., Glyavin, Mikhail Yu, Tsvetkov, Alexander I., Eremeev, Anatoly G., Kholoptsev, Vladislav V., Morozkin, Mikhail V., Shmelev, Mikhail Yu, Sobolev, Dmitry I., Chirkov, Alexey V., Tai, Eugeny M., Soluyanova, Elena A., Bakulin, Mikhail I.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.06.2016
• DOI: 10.1109/PLASMA.2016.7533987

This paper describes gyrotron-based setup developed by Gycom Ltd. jointly with IAP RAS and intended for use in superconducting ECR ion source FECRAL (a Fourth generation ECR ion source with Advanced design in Lanzhou, China) [1]. The setup is capable to provide output power up to 20 kW in both CW and pulse 15 - 200 ms duration with less than 10 μs fall time and up to 5 Hz repetition rate) modes with 45 GHz frequency. Gyrotron system uses a cryogen-free magnet JMTD-4T140 made by Jastec Inc. (Japan) that allows it to operate on fundamental harmonic (operation mode is TE 63 ). Gyrotron tube is designed to operate with diode-type electron gun, and using of depressed collector for recuperation of the electron beam residual energy leads to considerable total efficiency increasing. Output gyrotron radiation is converted by two-mirror matching optics unit (MOU) to the TEM 00 mode. Gaussian beam propagates from the MOU output through the air 1 to the distance of about 2 m) to the system of mirrors delivering the one to the mode converter (TEM 00 to TE 01 ) which is located on the high voltage (about 300 kV) platform and connected via waveguide with the FECRAL ion source. The gyrotron rack is under ground potential. The setup is fully equipped with the automated control, data acquisition and safety interlocks systems which guarantee convenient and safe operation. Currently the described system is under manufacturing. Commissioning tests are scheduled for the end of this year.