Plasma Instabilities in Superconducting Layers

超导层中的等离子体不稳定性

• 批准号: 9014167
• 负责人: Michael Graf
• 金额: $ 2万
• 依托单位: Boston College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1992-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9014167&HistoricalAwards=false
• 关键词: Plasma; Instabilities; Superconducting; Layers

An experimental search for theoretically predicted plasma wave instabilities in devices consisting of a superconducting layer of YBCO separated from a superconducting layer of niobium by a thin insulating layer is proposed. Theoretical work has shown that when the relative drift velocity between the parallel superconducting layers is large, an amplified plasma mode may exist, and can lose energy by electromagnetic radiation. This effect is similar to the 'two-beam plasma instability' for two- component collisionless plasmas. The research is to search for this effect by a) studying the current-voltage characteristics when a relative drift velocity exists between the two layers, and b) using bolometric detectors at low temperatures to detect the emitted radiation. The effect may have a long-term practical application in the design of generators of nearly monochromatic long-wavelength electromagnetic radiation.

提出了通过薄绝缘层与尼比姆超导层分离的YBCO层组成的设备中对理论上预测的等离子波不稳定性的实验搜索。 理论工作表明，当平行超导层之间的相对漂移速度很大时，可能存在扩增的等离子体模式，并且可能会因电磁辐射而失去能量。 该效果类似于两分之三无碰撞等离子体的“两光束等离子体不稳定性”。 该研究是通过a）在两层之间存在相对漂移速度时研究电流 - 电压特性，以及b）在低温下使用侧验探测器检测发射辐射时。 该效果可能在几乎单色长波长电磁辐射的发电机的设计中具有长期实际应用。