Plasma Scattering Measurement Using a Frequency Tunable, Submillimeter Wave Gyrotron as a Power Source

使用频率可调的亚毫米波回旋管作为电源进行等离子体散射测量

• 批准号: 03680006
• 负责人: OGAWA Isamu
• 金额: $ 1.41万
• 依托单位: Fukui University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03680006/
• 关键词: Scattering Measurement; Plasma Scattering Measurement; Submillimeter Wave Scattering Measurement; Gyrotron; Submillimeter Wave Gyrotron; Quasi-Optical Antenna

Objectives: Development of a high frequency gyrotron for high power source (-100 W) operating in the submillimeter wave range, conversion of the output into a high quality beam and its application to plasma scattering measurement.The results :1. Development of a submillimeter wave gyrotron as a power source for scattering measurement We stabilized the gyrotron oscillation at the second cyclotron harmonic (f=353 GHz, p=110 W) within 10% of output power during a pulse of 0.6 s. This oscillation is stable enough for scattering measurement. In order to get high frequency output, we have developed a new gyrotron using a 12 T superconducting magnet and succeeded in a single mode oscillation (f=595 GHz, p=220 W) at the second cyclotron harmonic. The maxim frequency attained up to now is 636 GHz.2. Production of a high quality beam We have made a quasi-optical antenna to converting a gyrotron output into a linearly-polarized, two dimensionally focusing beam. The antenna produces a well collimated beam to the extent of a diffraction effect. In order to improve the focusing and the mode purity of beam, we are making a new transmission line consisting of multi-mirrors, which converts a gyrotron output into a Gaussian beam and couples it to plasma.3. Plasma scattering measurement using a gyrotron as a power source We have constructed a scattering measurement system consisting of a gyrotron and a quasi-optical antenna and succeeded in observing drift waves in CHS (Compact Helical System in National Institute for Fusion Science) plasma. In the near future, we will improve a scattering measurement system by replacing the quasi-optical antenna with the new transmission line and will observe externally excited wave for plasma heating.

目的：研制了一台工作在亚毫米波段的大功率（~ 100 W）高频回旋管，将其输出转换成高质量的电子束，并将其应用于等离子体散射测量。作为散射测量电源的亚毫米波回旋管的研制我们在0.6s的脉冲内将回旋管振荡稳定在二次回旋谐波（f=353 GHz，p=110 W）的输出功率的10%以内。这种振荡对于散射测量是足够稳定的。为了获得高频输出，我们研制了一种新型的12 T超导回旋管，并成功地实现了二次谐波的单模振荡（f=595 GHz，p=220 W）。目前达到的最高频率为636 GHz.高质量光束的产生我们制作了一个准光学天线，将回旋管输出转换成线极化的二维聚焦光束。天线产生衍射效应程度的良好准直波束。为了提高光束的聚焦和模式纯度，我们制作了一种新型的多反射镜传输线，将回旋管输出的光束转换成高斯光束并耦合到等离子体中.用回旋管作电源的等离子体散射测量我们建立了一个由回旋管和准光学天线组成的散射测量系统，并成功地观测到了CHS（Compact Helical System in National Institute for Fusion Science）等离子体中的漂移波。在不久的将来，我们将通过用新的传输线代替准光学天线来改进散射测量系统，并将观察用于等离子体加热的外部激发波。

项目成果

G.F.Brand: "Mode Competition in a High Harmonic Gyrotron" Int.J.Electronics.

G.F.Brand：“高谐波回旋管中的模式竞争”Int.J.Electronics。

I.Ogawa, Y.Shimizu, Y.Yamagishi, T.Kanemaki, T.Tatsukawa and T.Idehara: "Development of Submillimeter Wave Gyrotron and its Application to Plasma Scattering Measurement" Technical Report of IEICE. ED92-108. 13-18 (1992)

I.Okawa、Y.Shimizu、Y.Yamagishi、T.Kanemaki、T.Tatsukawa 和 T.Idehara：“亚毫米波回旋管的发展及其在等离子体散射测量中的应用”IEICE 技术报告。

I.Ogawa: "Scattering Measurement of CHS plasma a Submillimeter Wave Gyrotron as a Power Source" 2nd AustraliaーJapan Workshop on Diagnostics for Fusion plasma. (1991)

I.Okawa：“以亚毫米波回旋管作为电源的 CHS 等离子体的散射测量”第二届澳大利亚-日本聚变等离子体诊断研讨会（1991 年）。

T.Idehara,T.Tatsukawa,I.Ogawa,S.Wada,Y .Yoshisue,F.Inoue and G.F.Brand: "Single Mode Operation of a Submillimeter Wave Gyrotron at the Third Harmonic Resonance" Phys.of Fluids. B4. 769-770 (1992)

T.Idehara、T.Tatsukawa、I.Okawa、S.Wada、Y.Yoshisue、F.Inoue 和 G.F.Brand：“亚毫米波回旋管在三次谐波谐振下的单模操作”流体物理学。

T.Idehara: "Development of a Second Cyclotron Harmonic Operation at Submillimeter Wavelengths" Phys.of Fluids B. 4. 267-273 (1992)

T.Idehara：“亚毫米波长下二次回旋加速器谐波操作的开发”Phys.of Fluids B. 4. 267-273 (1992)