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
Julkaistu sarjassa
Review of Scientific InstrumentsTekijät
Päivämäärä
2016Tekijänoikeudet
© 2015 AIP Publishing LLC. Published in this repository with the kind permission of the publisher.
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.
Julkaisija
American Institute of PhysicsISSN Hae Julkaisufoorumista
0034-6748Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/25288467
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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 ... -
Slit extraction and emittance results of a permanent magnet minimum-B quadrupole electron cyclotron resonance ion source
Kosonen, Sami; Kalvas, Taneli; Koivisto, Hannu; Tarvainen, Olli; Toivanen, Ville (Elsevier, 2024)We present an experimental and simulation study of high charge state ion beams produced with a permanent magnet electron cyclotron resonance ion source (ECRIS) with minimum-B quadrupole magnetic field topology and slit ... -
Bremsstrahlung Emission of an X-Band Permanent Magnet Minimum-B Quadrupole Electron Cyclotron Resonance Ion Source
Tarvainen, Olli; Toivanen, Ville; Kalvas, Taneli; Koivisto, Hannu A.; Kosonen, Sami (Institute of Electrical and Electronics Engineers (IEEE), 2024)We have carried out bremsstrahlung measurements on a permanent magnet minimum-B quadrupole electron cyclotron resonance (ECR) ion source operating at 10.3–11.5 GHz microwave frequencies. The bremsstrahlung spectral temperature ... -
Quasi-periodical kinetic instabilities in minimum-B confined plasma
Bhaskar, B. S.; Koivisto, H.; Tarvainen, O.; Thuillier, T.; Toivanen, V. (AIP Publishing, 2022)We present the results of an experimental investigation of quasi-periodical kinetic instabilities exhibited by magnetically confined electron cyclotron resonance heated plasmas. The instabilities were detected by measuring ... -
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 ...
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