345
edits
TJ-II:Role of isotope effect on biasing induced transitions in the TJ-II stellarator: Difference between revisions
TJ-II:Role of isotope effect on biasing induced transitions in the TJ-II stellarator (view source)
Revision as of 11:30, 27 January 2017
, 27 January 2017→Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)
| Line 13: | Line 13: | ||
== 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)== | ||
'''Motivation''': | '''Motivation''': | ||
Experimental studies have shown a reduction of the L-H power threshold by about 50% when using Deuterium instead of Hydrogen in tokamaks <ref>F. Ryter et al., Nuclear Fusion 53 (2013) 113003</ref>. The influence of isotope mass on spontaneous L-H transition has been recently | Experimental studies have shown a reduction of the L-H power threshold by about 50% when using Deuterium instead of Hydrogen in tokamaks <ref>F. Ryter et al., Nuclear Fusion 53 (2013) 113003</ref>. The influence of isotope mass on spontaneous L-H transition has been recently reported in DIII-D <ref>L. Schmitz, EX/P3-11, IAEA2016</ref> and in the TJ-II stellarator, concluding that Zonal Flows are instrumental both in H and D dominated plasmas to trigger the L-H transition <ref>U. Losada et al., CWGM/Madrid January 2017</ref>. | ||
'''Goals and planning''': | '''Goals and planning''': | ||
We propose to investigate the influence of isotope mass (H vs D) on TJ-II electrode biasing induced transitions with to goals: | We propose to investigate the influence of isotope mass (H vs D) on TJ-II electrode biasing induced transitions with to goals: | ||
# Study the influence of ion mass to reach biasing improved confinement regimes | # Study the influence of ion mass to reach biasing improved confinement regimes. If possible, biasing induced Limit cycle oscillation will be investigated to explore the dynamics of L-H transition and the difference between H vs D plasmas. This phenomenon was observed in Heliotron J biasing plasma. | ||
# Study the influence of magnetic configuration (ripple / iota) on biasing induced transitions | # Study the influence of magnetic configuration (ripple / iota) on biasing induced transitions and turbulence-induced transport. | ||
'''Experimental set-up''': | '''Experimental set-up''': | ||