Discrete and Continuous Models and Applied Computational ScienceDiscrete and Continuous Models and Applied Computational ScienceDiscrete and Continuous Models and Applied Computational Science2658-46702658-7149Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)2291710.22363/2658-4670-2019-27-4-355-364Mathematical models in PhysicsМатематические модели в физикеResearch ArticleThe features of the characteristic electromagnetic plasma bunches oscillations in the long magnetic mirrorОсобенности характерных электромагнитных колебаний плазменных сгустков в длинном пробкотронеNovitskiyAndrey A.НовицкийА. А.

Head of Laboratory of the Institute of Physical Research and Technologies

Институт физических исследований и технологий

novitskiy-aa@rudn.ruChuprovDenis V.ЧупровД. В.

Senior Lecturer of the Institute of Physical Research and Technologies

Институт физических исследований и технологий

chuprov-dv@rudn.ruKuznetsovVladislav A.КузнецовВ. А.

Student of the Institute of Physical Research and Technologies

Институт физических исследований и технологий

1032162058@rudn.ruShevtsovEugeniy A.ШевцовЕ. А.

Student of the Institute of Physical Research and Technologies

Институт физических исследований и технологий

1032162067@rudn.ruPeoples’ Friendship University of Russia (RUDN university)Российский университет дружбы народов15122019274VOL 27, NO4 (2019)ТОМ 27, №4 (2019)35536419022020Copyright ©; 2019, Novitskiy A.A., Chuprov D.V., Kuznetsov V.A., Shevtsov E.A.Copyright ©; 2019, Новицкий А.А., Чупров Д.В., Кузнецов В.А., Шевцов Е.А.2019Novitskiy A.A., Chuprov D.V., Kuznetsov V.A., Shevtsov E.A.Новицкий А.А., Чупров Д.В., Кузнецов В.А., Шевцов Е.А.https://creativecommons.org/licenses/by-nc/4.0https://journals.rudn.ru/miph/article/view/22917

The aim of this work was to study the spectrum of LF and HF oscillations generated by plasma bunches created and confined in the volume of a microwave cavity immersed in the magnetic field of a mirror trap. The registration of electrostatic oscillations in the plasma was carried out using two flat electrodes mounted diametrically opposite in the central part of the cavity close to its wall. This diagnostic showed the presence of low-frequency oscillations with frequencies of 130 kHz and 450 kHz. The oscillation spectrum in the microwave range was recorded at the minimum of the magnetic trap using a real-time spectrometer and a loosely coupled loop antenna. The registration of the spectra in the 40 MHz band revealed a regular change in the frequency of the fundamental oscillation mode of the cavity and the presence of two harmonics of the synchrotron radiation of the plasma bunch at frequencies of 2.25 GHz and 4.52 GHz, respectively. According to the obtained data, the parameters of the formed bunch (density, shape, volume, energy spectra of plasma components) can be restored.

Целью данной работы являлось изучение спектра НЧ и ВЧ колебаний генерируемых плазменными сгустками, создаваемыми и удерживаемыми в рабочем объеме высокочастотного резонатора, находящегося в магнитном поле зеркальной ловушки. Регистрация электростатических колебаний в плазме осуществлялось при помощи двух плоских электродов установленных диаметрально противоположно в центральной части резонатора в его пристеночной области. Эта диагностика показала наличие низкочастотных колебаний с частотами 130 кГц и 450 кГц. Спектр колебаний в СВЧ диапазоне регистрировался в минимуме магнитной ловушки при помощи спектрометра реально времени и слабо связанной петлевой антенны. Регистрация спектров в полосе 40 МГц позволила выявить закономерное изменение частоты основной моды колебаний резонатора и наличие двух гармоник синхротронного излучения плазменного сгустка на частотах 2.25 ГГц и 4.52 ГГц соответственно. По полученным данным могут быть восстановлены параметры сформированного сгустка (плотность, форма, объем, энергетические спектры компонент плазмы).

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