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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)
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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 == | ||
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== Description of required resources == | == Description of required resources == | ||
Required resources: | Required resources: | ||
* Number of plasma discharges or days of operation: 1 day. | * Number of plasma discharges or days of operation: 1 successful day (which may require more than 1 day, as HIBP and Doppler will have to be calibrated). | ||
* Essential diagnostic systems: | * Essential diagnostic systems: | ||
We will measure: | We will measure: | ||
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* Type of plasmas (heating configuration): plasmas created with NBI without ECH; the two NBIs should inject sequentially. | * Type of plasmas (heating configuration): plasmas created with NBI without ECH; the two NBIs should inject sequentially. <math>B=0.6T</math>. | ||
* Specific requirements on wall conditioning if any: inmediately after lithium-coating for good density control. | * Specific requirements on wall conditioning if any: inmediately after lithium-coating for good density control. | ||
* External users: need a local computer account for data access: yes/no | * External users: need a local computer account for data access: yes/no | ||
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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]] | ||