Realization of an intense, sub-terahertz radiation source to produce high quality output by simultaneously stabilizing the intensity and the frequency of the gyrotron output beam.

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05362
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Plasma science
• Research Institution: University of Fukui
• Principal Investigator: Ogawa Isamu 福井大学, 遠赤外領域開発研究センター, 教授 (90214014)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: ジャイロトロンの出力・周波数の同時安定化 / ミリ波・サブミリ波帯の強力な光源 / 周波数のフィードバック制御 / 出力電磁波強度のフィードバック制御

Outline of Final Research Achievements

Simultaneous stabilization of the intensity and the frequency of the gyrotron output beam is carried out. Frequency fluctuation level of CW, 190 GHz gyrotron output was 10 MHz. Frequency fluctuation level was decreased to 2 MHz by reducing fluctuation level of cooling water temperature of gyrotron cavity region down to 0.1℃. Frequency was stabilized within 0.5 MHz for 1 hour by the feedback control to adjust body potential.
The linearly polarized output beam from gyrotron is incident on polarizer. The intensity of penetrating beam is changed by rotating the polarizer. The intensity of penetrating beam was stabilized within 1 % for 1 hour by the feedback control to adjust rotating angle of the polarizer. Simultaneous stabilizations of the intensity and the frequency of the gyrotron output beam are carried out by the feedback controls.

Free Research Field

プラズマ理工学