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TJ-II:L-H Transition and Isotope Effect in low magnetic ripple configurations: Difference between revisions
TJ-II:L-H Transition and Isotope Effect in low magnetic ripple configurations (view source)
Revision as of 13:02, 3 February 2017
, 3 February 2017→Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)
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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 loer magnetic ripple, that is, with lower plasma volume. | 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 loer 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. | ||
[2] U. Losada et al., L-H Transition and Isotope Effect in TJ-II. 16th CWGM, Madrid, Spain, 2017. | [2] U. Losada et al., L-H Transition and Isotope Effect in TJ-II. 16th CWGM, Madrid, Spain, 2017. | ||
== If applicable, International or National funding project or entity == | == If applicable, International or National funding project or entity == | ||