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TJ-II:L-H Transition and Isotope Effect in low magnetic ripple configurations: Difference between revisions
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== Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)== | == Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)== | ||
Experiments using deuterium as working gas have been carried out during the last experimental campaigns to study the isotope effect strength in TJ-II plasmas. The dependence of zonal flows on the ion mass was studied in low density ECH plasmas and no pronounced differences were found when comparing D and H plasmas [1]. More recently, higher density NBI heated plasmas have been studied and very similar values of zonal flow intensity in H and D have been also found at the L-H transition [2]. In these experiments, no signatures of isotope mass dependence were found at the L-H transition, neither in the radial electric field profile evolution nor in the turbulence reduction. In all cases experiments were performed in the standard magnetic configuration | Experiments using deuterium as working gas have been carried out during the last experimental campaigns to study the isotope effect strength in TJ-II plasmas. The dependence of zonal flows on the ion mass was studied in low density ECH plasmas and no pronounced differences were found when comparing D and H plasmas [1]. More recently, higher density NBI heated plasmas have been studied and very similar values of zonal flow intensity in H and D have been also found at the L-H transition [2]. In these experiments, no signatures of isotope mass dependence were found at the L-H transition, neither in the radial electric field profile evolution nor in the turbulence reduction. In all cases experiments were performed in the standard magnetic configuration | ||
In order to investigate the impact of the magnetic configuration on the isotope effect we propose to perform similar experiments in a magnetic configuration with | In order to investigate the impact of the magnetic configuration on the isotope effect we propose to perform similar experiments in a magnetic configuration with lower magnetic ripple, that is, with lower plasma volume. | ||
[1] C. Hidalgo et al., Isotope effect on zonal flows: experiments in the TEXTOR tokamak and TJ‐II stellarator. 19th International Stellarator Heliotron Workshop, Padova, Italy, 2013. | [1] C. Hidalgo et al., Isotope effect on zonal flows: experiments in the TEXTOR tokamak and TJ‐II stellarator. 19th International Stellarator Heliotron Workshop, Padova, Italy, 2013. | ||
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== Preferred dates and degree of flexibility == | == Preferred dates and degree of flexibility == | ||
Preferred dates: | Preferred dates: before 20-05-2017 | ||
== References == | == References == | ||
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[[Category:TJ-II internal documents]] | [[Category:TJ-II internal documents]] | ||
[[Category:TJ-II experimental proposals]] | [[Category:TJ-II experimental proposals 2017]] | ||