Development of a High-Power Millimeter-Wave Pulse Source Using High-T_c Superconductors

高温超导高功率毫米波脉冲源的研制

• 批准号: 04555019
• 负责人: KATO Keizo
• 金额: $ 4.48万
• 依托单位: Niigata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04555019/
• 关键词: High-T_c Superconductor; Superconducting Thin Film; Millimeter-Wave; Transmitted Power; Q Value; Output Pulse; Cavity; Dielectric Resonator

A high-power millimeter-wave pulse source using high-T_c superconductors was studied. Y-Ba-Cu-O (YBCO) superconducting thin films were prepared by the laser ablation technique and the critical temperature T_c of the filim was about 90 K.The YBCO film was installed in a cylindrical TE_<011> mode cavity made of copper. The diameter and the length of the cavity were 15.8 mm and 23.8 mm, respectively. The YBCO film was attached to the circular window with 8 mm in diameter at the center of the end wall of the cavity. The resonant frequency was 24.0 GHz. The unloaded Q values of the cavity were 1.3 X 10^3 at room temperature and 2.6 X 10^3 at 20 K.The CW transmitted power through the film gradually increases with temperature above T_c and was not observed below 50 K.The characteristic of the CW transmission was not better than that result using 2.8 GHz cavity, since the surface resistance of the YBCO film increased with frequency. The switching from super- to normal-conducting state in the YBCO film was made using a 1.06-mum pulsed Q-switched Nd : YAG laser with a duration of 10 ns. Millimeter-wave pulses were extracted from the cavity. The peak power of the output pulses at 30 K was 1.1 times as large as the CW input power. If a cavity with a unloaded Q value of 10^6 is used, the peak power of the output pulse is thought to be one thousand times greater than the CW input power theoretically. A millimeter-wave pulse source utlizing a dielectric resonator were also studied theoretically. It was found that the dielectric resonator was useful.

研究了高t_c超导体的大功率毫米波脉冲源。采用激光烧蚀技术制备了Y-Ba-Cu-O （YBCO）超导薄膜，薄膜的临界温度T_c约为90 K。YBCO薄膜被安装在由铜制成的TE_<011>圆柱模腔中。空腔直径为15.8 mm，长度为23.8 mm。将YBCO膜附着在腔端壁中心直径为8mm的圆窗上。谐振频率为24.0 GHz。空腔的卸载Q值在室温下为1.3 X 10^3，在20k时为2.6 X 10^3。在温度高于T_c时，连续波通过薄膜的传输功率逐渐增大，低于50 K时没有观察到。由于YBCO膜的表面电阻随频率的增加而增加，因此其连续传输特性并不优于使用2.8 GHz腔的连续传输特性。利用1.06 μ m脉冲调q Nd: YAG激光器，持续时间为10 ns，实现了YBCO薄膜从超导体状态切换到正导体状态。从腔体中提取毫米波脉冲。输出脉冲在30k时的峰值功率是连续波输入功率的1.1倍。如果一个空腔的Q值为10^6，理论上输出脉冲的峰值功率被认为是连续波输入功率的1000倍。本文还从理论上研究了利用介质谐振腔的毫米波脉冲源。发现介电谐振器是有用的。

项目成果

冨田 卓哉: "YBCO超伝導薄膜スイッチによるミリ波空洞からのパルス抽出" 電子情報通信学会技術研究報告. 67-72 (1994)

Takuy​​a Tomita：“使用 YBCO 超导薄膜开关从毫米波腔中提取脉冲”IEICE 技术报告 67-72 (1994)。

冨田 卓哉: "超電導薄膜による誘電体共振器からのミリ波パルス抽出に関する理論的検討" 平成5年電気学会全国大会講演論文集. 35 (1993)

Takuy​​a Tomita：“使用超导薄膜从介电谐振器中提取毫米波脉冲的理论研究”日本电气工程师学会 1993 年全国会议记录 35 (1993)。

Kuniharu Takahashi: "Extraction of Microwave Pulses from a Cavity Using a Y-Ba-Cu-O Superconducting Film Switch" Japanese Journal of Applied Physics. 31. 123-128 (1992)

Kuniharu Takahashi：“使用 Y-Ba-Cu-O 超导薄膜开关从腔体中提取微波脉冲”《日本应用物理学杂志》。

冨田 卓哉: "YBCO超伝導薄膜を用いたミリ波パルス源に関する基礎的実験" 平成5年度電子情報通信学会信越支部大会講演論文集. 231-232 (1993)

Takuy​​a Tomita：“使用 YBCO 超导薄膜的毫米波脉冲源的基本实验”1993 年 IEICE Shin-Etsu 分会会议记录 231-232 (1993)。

Takuya Tomita et al.: "Experiments on the Millimeter-Wave Pulse Source Using a YBCO Superconducting Thin Film" 1993 Shinetsu Convention of IEICE Japan. 231-232 (1993)

Takuy​​a Tomita 等人：“使用 YBCO 超导薄膜进行毫米波脉冲源的实验”1993 年 IEICE 日本信越大会。