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TJ-II:Observation of suprathermal ions with Neutral Particle Analyzers during electron cyclotron heating in the TJ-II stellarator: Difference between revisions
TJ-II:Observation of suprathermal ions with Neutral Particle Analyzers during electron cyclotron heating in the TJ-II stellarator (view source)
Revision as of 10:54, 13 February 2018
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== Description of the activity, including motivation/objectives | == Description of the activity, including motivation/objectives == | ||
Suprathermal ions have been detected using optical spectroscopy techniques in TJ-II <ref> Rapisarda et al. Plasma Phys. Control. Fusion '''49''' 309 (2007). </ref> but without conclusive results when using NPA diagnostics <ref> Fontdecaba et al. Review of Scientific Instruments '''85''' 11E803 (2014). </ref>. One experiment of the 2016 campaign, designed to investigate this population, consisted in operating one gyrotron along all the discharge while modulating the second gyrotron at 100% of its power <ref> Zurro et al. 44thEPS Conference on Plasma Physics P1.145 (2017).</ref> and changing the power deposition position in a shot-to-shot basis. No neutral beam power was injected. When both gyrotrons were on an indication of suprathermal ions was observed by the NPA diagnostic, see figure 1. | Suprathermal ions have been detected using optical spectroscopy techniques in TJ-II <ref> Rapisarda et al. Plasma Phys. Control. Fusion '''49''' 309 (2007). </ref> but without conclusive results when using NPA diagnostics <ref> Fontdecaba et al. Review of Scientific Instruments '''85''' 11E803 (2014). </ref>. One experiment of the 2016 campaign, designed to investigate this population, consisted in operating one gyrotron along all the discharge while modulating the second gyrotron at 100% of its power <ref> Zurro et al. 44thEPS Conference on Plasma Physics P1.145 (2017).</ref> and changing the power deposition position in a shot-to-shot basis. No neutral beam power was injected. When both gyrotrons were on an indication of suprathermal ions was observed by the NPA diagnostic, see figure 1. | ||