ECR-ionilähteiden plasmapotentiaali ja ambipolaarinen diffuusio
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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 ... -
VUV-diagnostics of low temperature hydrogen plasmas
Komppula, Jani (University of Jyväskylä, 2015) -
Photoelectron emission experiments with ECR-driven multi-dipolar negative ion plasma source
Laulainen, Janne; Kalvas, Taneli; Koivisto, Hannu; Kronholm, Risto; Tarvainen, Olli; Aleiferis, S.; Svarnas, P. (AIP Publishing, 2017)Photoelectron emission measurements have been performed using a 2.45 GHz ECR-driven multi-dipolar plasma source in a low pressure hydrogen discharge. Photoelectron currents induced by light emitted from ECR zone and H− ... -
Photoelectron emission induced by low temperature hydrogen plasmas
Laulainen, Janne; Kalvas, Taneli; Koivisto, Hannu; Kronholm, Risto; Tarvainen, Olli (AIP Publishing, 2018)Experimental results of low temperature hydrogen plasma induced photoelectron emission measurements comparing two different plasma heating methods are summarized. By exposing the samples to the vacuum ultraviolet radiation ... -
VUV emission spectroscopy combined with H− density measurements in the ion source Prometheus I
Aleiferis, S.; Laulainen, Janne; Svarnas, P.; Tarvainen, Olli; Bacal, M.; Béchu, S. (AIP Publishing, 2017)“Prometheus I” is a volume H− negative ion source, driven by a network of dipolar electron cyclotron resonance (ECR; 2.45 GHz) modules. The vacuum-ultraviolet (VUV) emission spectrum of low-temperature hydrogen plasmas may ...
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