Abstract
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.
Highlights
The possibility of generating long-lived plasma bunches with an energetic electronic component under conditions of gyromagnetic autoresonance (GA) in the magnetic field of mirror trap in the regime of a reverse magnetic field has been shown previously [1], [2]. In this mode the reverse pulsed magnetic field is created by coils located at the maxima of the electric component of the microwave field of a standing wave and reduced static magnetic strength to a value that corresponds to the classical electron cyclotron resonance (ECR)
The aim of this work was to study the spectrum of LF and HF oscillations generated by plasma bunches created and confined in the mirror trap within microwave cavity
The direction of the current in the pulsed coils provides the creation of a pulsed magnetic field with direction of the induction opposite to the induction of the stationary field, reducing locally the resulting magnetic field to a level corresponding to the ECR value for the operating frequency
Summary
The possibility of generating long-lived plasma bunches with an energetic electronic component under conditions of gyromagnetic autoresonance (GA) in the magnetic field of mirror trap in the regime of a reverse magnetic field has been shown previously [1], [2]. In this mode the reverse pulsed magnetic field is created by coils located at the maxima of the electric component of the microwave field of a standing wave and reduced static magnetic strength to a value that corresponds to the classical electron cyclotron resonance (ECR). The aim of this work was to study the spectrum of LF and HF oscillations generated by plasma bunches created and confined in the mirror trap within microwave cavity
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