Development and applications of high-quality gyrotrons -Ultra high power gyrotrons and ultra high frequency gyrotrons-

高品质陀螺仪的开发与应用-超高功率陀螺仪和超高频陀螺仪-

• 批准号: 10044143
• 负责人: OGAWA Isamu
• 金额: $ 4.29万
• 依托单位: Fukui University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044143/
• 关键词: Gyrotron; High power gyrotron; High frequency gyrotron; Submillimeter wave gyrotron; Frequency tunable gyrotron; High mode purity gyrotron; Gaussian beam; Submillimeter wave beam; サブミリ波; 周波数可変; 超高周波ジャイロトロン

High frequency, medium power gyrotrons (Gyrotrons FU series) achieved the highest frequency of 889 GHz for single mode operation at the second harmonic (N=2) and the frequency step-tunability from 38 to 889 GHz using the fundamental, second, and third harmonic operation. Output powers of several hundred watts at the fundamentals and several ten watts at second harmonics have been achieved.As a result of the feedback control of the anode potential we succeeded to reduce the fluctuation level of the cw output power (f=301 GHz, P=20 W) from 3.7% to 1.5%. The fluctuation level could be decreased down to 0.6% by reducing fluctuation level of the cathode potential below 3 V. As a result of the control of the anode potential we succeeded to modulate the gyrotron output with a modulation frequency up to 20 kHz.The conversion system consists of a quasi-optical antenna, sequence of two ellipsoidal focusing mirrors and a spatial filter. It is intended to convert four TEィイD21nィエD2 mode outputs of the Gyrotron FU IVA (TEィイD212ィエD2, 170 GHz; TEィイD213ィエD2, 271 GHz; TEィイD214ィエD2, 372 GHz; TEィイD215ィエD2, 472 GHz) into gaussian-like beams with waist size of wィイD2x"ィエD2=wィイD2y"ィエD2=16.3 mm as well as three TEィイD20nィエD2 modes (TEィイD202ィエD2, 223 GHz; TEィイD203ィエD2, 323 GHz; TEィイD204ィエD2, 423 GHz) into bigaussian-like beams with waist sizes of wィイD2x"ィエD2 =23.5 mm and wィイD2yo"ィエD2=16.4 mm. Compared with the earlier system capable of converting only one operating mode the novel one is more versatile and is compatible with frequency tunable gyrotrons such as the Gyrotron FU IVA. In spite of the truncation of the sidelobes of the beam by the spatial filter most of the image source power is transferred to the final waist. As a result, intense high-quality beams in the submillimeter wavelength range can be produced.

高频、中等功率回旋管（Gyrotrons FU系列）在二次谐波（N=2）下实现了889 GHz的最高单模工作频率，并使用基波、二次和三次谐波工作实现了38至889 GHz的频率步进可调谐性。通过阳极电位的反馈控制，使连续波（f=301 GHz，P=20 W）输出功率的波动从3.7%减小到1.5%。阴极电位的波动水平可降低到3V以下的波动水平下降到0.6%。作为阳极电位的控制的结果，我们成功地调制的回旋管输出的调制频率高达20 kHz。转换系统包括一个准光学天线，序列的两个椭球聚焦镜和一个空间滤波器。其旨在转换Gyrotron FU IVA的四个TE TE TE D21 n TE D2模式输出（TE贴片D212贴片D2，170 GHz; TE贴片D213贴片D2，271 GHz; TE贴片D214贴片D2，372 GHz; TE偏振D215偏振D2，472 GHz）转换为具有束腰尺寸为W偏振D2 x”偏振D2=W偏振D2 y”偏振D2=16.3 mm以及三个TE偏振D20 n偏振D2模式的类高斯光束（TE贴片D202贴片D2，223 GHz; TE贴片D203贴片D2，323 GHz; TE电磁阀D204电磁阀D2，423 GHz）转换为具有腰部尺寸的类双高斯光束，腰部尺寸为W_D2 x_D2 =23.5 mm，W_D2 yo_D2= 23.5 mm。与仅能转换一种操作模式的早期系统相比，新系统更通用，并且与诸如Gyrotron FU的频率可调谐陀螺管兼容IVA。尽管空间滤波器截断了光束的旁瓣，但大部分像源功率仍传递到最后的束腰。因此，可以产生亚毫米波长范围内的高质量光束。

项目成果

I.Ogawa et al.: "Design of a quasi-optical system converting the TE_<06> output mode of a gyrotron into a gaussian-like beam"International Journal of Infrared Millimeter Waves. 20・4. 543-558 (1999)

I. Okawa 等人：“将回旋管的 TE_<06> 输出模式转换为类高斯光束的准光学系统的设计”国际红外毫米波杂志 20・4 (1999)。

T.Idehara et al.: "Nonlinear regime of amplitude moclulation in sulmillinster wave gyretrons (Gyrotron FU III and IV)" Int.J.Infrared and Millineter Waues. 19・12. 1607-1625 (1998)

T.Idehara 等人：“sulmillinster 波回旋管（Gyrotron FU III 和 IV）中的振幅调制的非线性机制”Int.J.Infrared 和 Millineter Waues 19・12（1998）。

T. Idehara: "Study of electron beam misalignment in a submillimeter wave gyrotron"Int. J. of Infrared and Millimeter Waves. 19-10. 1303-1316 (1998)

T. Idehara：“亚毫米波回旋管中电子束失准的研究”Int。

T. Idehara: "Rapid frequency step-switching in submillimeter wave gyrotrons (Gyrotrons FU III and FU IV)"Phys. of Plasma. 6-6. 2613-2617 (1999)

T. Idehara：“亚毫米波回旋管（回旋管 FU III 和 FU IV）中的快速频率步进切换”Phys。

T.Idehara et al.: "Rapid frequency step-switching in submillimeter wave gyrotrons (Gyrotrons FU III and FU IV)"Physics of Plasma. 6・6. 2613-2617 (1999)

T. Idehara 等人：“亚毫米波回旋管（回旋管 FU III 和 FU IV）中的快速频率步进切换”《等离子体物理学》6・6（1999 年）。