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TJ-II:Comparison of transport of on-axis and off-axis ECH-heated plasmas: Difference between revisions
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TJ-II:Comparison of transport of on-axis and off-axis ECH-heated plasmas (view source)
Revision as of 19:56, 22 January 2017
, 22 January 2017no edit summary
(Created page with "== Experimental campaign == 2017 Spring == Proposal title == ''Comparison of transport of on-axis and off-axis ECH-heated plasmas'' == Name and affiliation of proponent == J...") |
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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)== | ||
'''Motivation.''' | '''Motivation.''' | ||
Particle transport of ECH plasmas is not well understood, as neoclassical simulations seem to overestimate the radial particle flux of on-axis heated ECH-plasmas; on the other hand, preliminary analyses show that this problem does not exist for off-axis ECH-heated plasmas. A comparison between these two situations (including neoclassical and gyrokinetic simulations and corresponding measurements) may shed some light on this problem, probably relevant for assessing the fuelling requirements of reactor plasmas. Even if the results along this line are finally not conclusive, the experimental and theoretical characterization of turbulence with different profiles (peaked/hollow <math>T_e</math> with hollow/peaked<math>n_e</math>) is itself relevant. | |||
Particle transport of ECH plasmas is not well understood<ref>Dinklage 2013 NF</ref>, as neoclassical simulations seem to overestimate the radial particle flux of on-axis heated ECH-plasmas; on the other hand, preliminary analyses show that this problem does not exist for off-axis ECH-heated plasmas. A comparison between these two situations (including neoclassical and gyrokinetic simulations and corresponding measurements) may shed some light on this problem, probably relevant for assessing the fuelling requirements of reactor plasmas<ref>Maassberg 1999 NF</ref>. Even if the results along this line are finally not conclusive, the experimental and theoretical characterization of turbulence with different profiles (peaked/hollow <math>T_e</math> with hollow/peaked <math>n_e</math>) is itself relevant. | |||
'''Objectives.''' | '''Objectives.''' | ||
In this experiment we plan to scan (shot-to-shot) the radial position of ECH absortion and measure: | In this experiment we plan to scan (shot-to-shot) the radial position of ECH absortion and measure: | ||
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* Radial electric field profile. | * Radial electric field profile. | ||
* .... | * .... | ||
We will compare the measurements with neoclassical and gyrokinetic simulations. | |||