Cyclotron instability in the afterglow mode of minimum-B ECRIS
Izotov, I., Kalvas, T., Koivisto, H., Komppula, J., Kronholm, R., Laulainen, J., Mansfeld, D., Skalyga, V., & Tarvainen, O. (2016). Cyclotron instability in the afterglow mode of minimum-B ECRIS. Review of Scientific Instruments, 87(2), Article 02A729. https://doi.org/10.1063/1.4935624
Published inReview of Scientific Instruments
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It was shown recently that cyclotron instability in non-equilibrium plasma of a minimum-B electron cyclotron resonance ion source (ECRIS) causes perturbation of the extracted ion current and generation of strong bursts of bremsstrahlung emission, which limit the performance of the ion source. The present work is devoted to the dynamic regimes of plasma instability in ECRIS operated in pulsed mode. Instability develops in decaying plasma shortly after heating microwaves are switched off and manifests itself in the form of powerful pulses of electromagnetic emission associated with precipitation of high energy electrons. Time-resolved measurements of microwave emission bursts are presented. It was found that even in various gases (helium and oxygen were studied) and at different values of magnetic field and heating power, the dynamic spectra demonstrate common features: decreasing frequency within a single burst as well as from one burst to another.
PublisherAmerican Institute of Physics
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Dynamic regimes of cyclotron instability in the afterglow mode of minimum-B electron cyclotron resonance ion source plasma Mansfeld, D.; Izotov, I.; Skalyga, V.; Tarvainen, Olli; Kalvas, Taneli; Koivisto, Hannu; Komppula, Jani; Kronholm, Risto; Laulainen, Janne (Institute of Physics Publishing, 2016)The paper is concerned with the dynamic regimes of cyclotron instabilities in non-equilibrium plasma of a minimum-B electron cyclotron resonance ion source operated in pulsed mode. The instability appears in decaying ion ...
Broadband microwave emission spectrum associated with kinetic instabilities in minimum-B ECR plasmas Izotov, I.; Kalvas, Taneli; Koivisto, Hannu; Kronholm, Risto; Mansfeld, D.; Skalyga, V.; Tarvainen, Olli (American Institute of Physics, 2017)Plasmas of electron cyclotron resonance ion sources (ECRISs) are prone to kinetic instabilities due to the resonant heating mechanism resulting in anisotropic electron velocity distribution. Frequently observed periodic ...
Izotov, Ivan; Tarvainen, Olli; Skalyga, Vadim; Mansfeld, Dmitry; Kalvas, Taneli; Koivisto, Hannu; Kronholm, Risto (IOP Publishing, 2018)The measurement of the electron energy distribution (EED) of electrons escaping axially from a minimum-B electron cyclotron resonance ion source (ECRIS) is reported. The experimental data were recorded with a room-temperature ...
Effect of double frequency heating on the lead afterglow beam currents of an electron cyclotron resonance ion source Toivanen, V.; Bellodi, G.; Küchler, D.; Wenander, F.; Tarvainen, Olli (American Physical Society, 2017)The effect of double frequency heating on the performance of the CERN GTS-LHC 14.5 GHz Electron Cyclotron Resonance (ECR) ion source in afterglow mode is reported. The source of the secondary microwave frequency was operated ...
Tarvainen, Olli; Kalvas, Taneli; Koivisto, Hannu; Komppula, Jani; Kronholm, Risto; Laulainen, Janne; Izotov, I.; Mansfeld, D.; Skalyga, V.; Toivanen, V. (Institute of Applied Physics of the Russian Academy of Sciences, 2014)Experimental observation of cyclotron instabilities in electron cyclotron resonance ion source plasma operated in cwmode is reported. The instabilities are associated with strong microwave emission and a burst of energetic ...