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.

研究了一种利用高温超导体的高功率毫米波脉冲源。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Tc约为90 K<011>。腔的直径和长度分别为15.8 mm和23.8 mm。将YBCO膜附接到腔的端壁的中心处的直径为8 mm的圆形窗口。谐振频率为24.0 GHz。在室温和20 K时，腔的无载Q值分别为1.3 × 10 ~ 3和2.6 × 10 ~ 3。在T_c以上，连续波透过率随温度的升高而逐渐增大，在50 K以下，连续波透过率随温度的升高而减小。使用1.06 μ m脉冲调Q Nd：YAG激光器，持续时间为10 ns的YBCO薄膜中的超导到正常导电状态的切换。毫米波脉冲从腔中提取。在30 K时输出脉冲的峰值功率是CW输入功率的1.1倍。如果使用无载Q值为10^6的腔，则输出脉冲的峰值功率理论上被认为是CW输入功率的一千倍。对利用介质谐振器的毫米波脉冲源进行了理论研究。发现介质谐振器是有用的。

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。