Cyclotron emission spectra from collisionless electrons resonantly heated by cyclotron waves in a magnetic mirror

• Published in: Fusion engineering and design Vol. 53; no. 1; pp. 229 - 236
• Main Authors: Tatematsu, Y., Saito, T., Kiwamoto, Y., Ito, K., Abe, H., Ishikawa, M., Koyama, H., Katanuma, I., Yatsu, K.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 2001; New York, NY Elsevier Science
• Subjects: Applied sciences; Controled nuclear fusion plants; Cyclotron emission spectra; Electron cyclotron resonance; Electron emission; Electrons; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Installations for energy generation and conversion: thermal and electrical energy; Magnetic mirror; Plasma heating; Resonant heating; Magnetic mirror; Cyclotron emission spectra; Resonant heating; Electrons; Tokamak; Nuclear fusion reactor; Cyclotron wave; Electron cyclotron resonance; Electron heating; Emission spectrum
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/S0920-3796(00)00489-0

The frequency spectrum of cyclotron emission resonantly heated electrons in a magnetic mirror is investigated. In an experiment, a very strong emission is observed in a narrow frequency band just higher than the frequency of a heating wave, in addition to radiation with a broad frequency spectrum. The cyclotron emission spectrum from resonantly heated electrons is theoretically calculated with a velocity distribution of electrons bouncing in a magnetic mirror and experiencing multiple heating. The calculation shows that the observed narrow spectrum is attributed to cyclotron emission from heated electrons that are magnetically reflected and accumulated within a narrow region around the resonant heating layer.