Open AccessEnergy distribution and bremsstrahlung spectra of energetic electrons escaping from the ECR plasma with high energy input
Author(s) -
Elena Kiseleva,
I. V. Izotov,
В. А. Скалыга,
С. С. Выбин,
Р. Л. Лапин
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2244/1/012005
Subject(s) - bremsstrahlung , plasma , atomic physics , spectral line , distribution function , electron , ionization , range (aeronautics) , gyrotron , physics , ion , computational physics , nuclear physics , materials science , quantum mechanics , astronomy , composite material
Electron energy distribution function (EEDF) is an important characteristic that defines the processes of plasma confinement and ionization. Understanding such processes is crucial for the proper tuning of ion sources. In the ECR plasma, the EEDF is significantly non-Maxwellian, and the exact shape remains still unknown. As the initial step towards the EEDF resolving, the energy distribution of the electrons lost from the magnetic mirror trap was directly measured in a wide range of neutral gas pressures and gyrotron powers along with bremsstrahlung spectra. A series of experiments were performed on the newly constructed Gasdynamic Ion Source for Multipurpose Operation (GISMO) facility allowing record-breaking specific energy input into the plasma. Obtained distributions showed unconventional behavior as the function of source parameters. The EEDF shape and the bremsstrahlung spectra showed a threshold qualitative change with the gyrotron power presumably as a result of the development of kinetic instabilities.