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TJ-II:Radial electric field of low-magnetic-field low-collisionality NBI plasmas: Difference between revisions
TJ-II:Radial electric field of low-magnetic-field low-collisionality NBI plasmas (view source)
Revision as of 14:43, 25 January 2017
, 25 January 2017→Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)
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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.''' | ||
Impurity hole plasmas are characterized by having negative radial electric field that is smaller in absolute value than the ion tempererature gradient<ref>Velasco 2017 NF</ref>. In this work, we also showed data from NBI-only plasmas of TJ-II: as the density was reduced, the core electrostatic potential got closer to zero. In this experiment, we plan to make the radial electric field even smaller by creating the plasmas in configurations of reduced magnetic field strength, since <math>E_r</math> should be proportional to <math>B</math> for impurity-hole-relevant plasmas. | Impurity hole plasmas are characterized by having negative radial electric field that is smaller in absolute value than the ion tempererature gradient<ref>Velasco 2017 NF</ref>. In this work, we also showed data from NBI-only plasmas of TJ-II: as the density was reduced, the core electrostatic potential got closer to zero. In this experiment, we plan to make the radial electric field even smaller by creating the plasmas with NBI in configurations of reduced magnetic field strength, since <math>E_r</math> should be proportional to <math>B</math> for impurity-hole-relevant plasmas. | ||
'''Objectives.''' | '''Objectives.''' | ||
In this experiment we plan to measure the ion temperature and radial electric field, and the plasma profiles of comparable NBI-only plasmas with different magnetic field strength. | In this experiment we plan to measure the ion temperature and radial electric field, and the plasma profiles of comparable NBI-only plasmas with different magnetic field strength. Additionally, over the NBI-created plasmas, we will check whether additional ECH power can be absorbed and this has an effect on impurities. | ||
== If applicable, International or National funding project or entity == | == If applicable, International or National funding project or entity == | ||