Excitation of eigenwaves of a layered superconductor of cylindrical configuration by an electron beam
DOI (Low Temperature Physics):
https://doi.org/10.1063/10.0043964Ключові слова:
Layered superconductor, hybrid waves, pseudosurface waves, electron beam, Vavilov–Cherenkov effect, anomalous Doppler effectАнотація
Теоретично досліджено нестійкість нерелятивістського тонкого трубчастого електронного пучка, що поширюється у вакуумі над циліндричним шаруватим надпровідником. Кристалографічна вісь c надпровідника спрямована вздовж осі циліндра. Аналіз спектрів власних хвиль показав, що для ненульових азимутальних індексів мод власні хвилі є гібридними, утвореними внаслідок суперпозиції звичайної та незвичайної джозефсонівських плазмових хвиль. Передбачено існування нового типу хвилі, який отримав назву гібридної псевдоповерхневої джозефсонівської плазмової хвилі, і показано, що саме ця мода може існувати в певному частотному діапазоні вище джозефсонівської плазмової частоти. Встановлено, що на джозефсонівській плазмовій частоті відбувається трансформація спектра, під час якої гібридні поверхневі джозефсонівські плазмові хвилі перетворюються на відповідні псевдоповерхневі моди. Досліджено поляризацію власних мод, яка демонструє перехід від лінійної та кругової поляризації для поверхневих мод поблизу вакуумної світлової лінії до еліптичної поляризації псевдоповерхневих мод у загальному випадку за більших поздовжніх хвильових чисел. Аналіз приросту нестійкості, зумовленого як ефектом Вавілова–Черенкова, так і аномальним ефектом Доплера, вказує на те, що механізм Вавілова–Черенкова забезпечує найбільший приріст нестійкості. Отримані результати свідчать, що використання шаруватих надпровідників як сповільнювальних структур є новим підходом до розробки джерел ТГц-випромінювання, який має такі переваги, як нижчі омічні втрати, динамічне налаштування частоти та простіша геометрія.
Посилання
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