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TJ-II:Effect of pellet injection on the radial electric field profile of stellarators: Difference between revisions
TJ-II:Effect of pellet injection on the radial electric field profile of stellarators (view source)
Revision as of 23:22, 18 January 2017
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== Description of required resources == | == Description of required resources == | ||
Required resources: | Required resources: | ||
* Number of plasma discharges or days of operation: | * Number of plasma discharges or days of operation: 1 | ||
* Essential diagnostic systems: | * Essential diagnostic systems: | ||
We will measure: | |||
- The time evolution of the line-averaged density <math><n_e(t)></math> with interferometry. | - The time evolution of the line-averaged density <math><n_e(t)></math> with interferometry. | ||
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In principle, a positive electric field should lead outward convection for impurities, but this was not the case of W7-AS plasmas with core electron root and positive ion root at intermediate radial positions <ref>Baldzuhn 1999 PPCF, Hirsch 2008 PPCF</ref>. We will nevertheless keep an eye on the radiation signals from the bolometers as they can provide (when normalized by the electron density) an indication of the impurity content of the plasma. | In principle, a positive electric field should lead outward convection for impurities, but this was not the case of W7-AS plasmas with core electron root and positive ion root at intermediate radial positions <ref>Baldzuhn 1999 PPCF, Hirsch 2008 PPCF</ref>. We will nevertheless keep an eye on the radiation signals from the bolometers as they can provide (when normalized by the electron density) an indication of the impurity content of the plasma. | ||
* Type of plasmas (heating configuration): NBI | * Type of plasmas (heating configuration): NBI plasmas with approximately constant line-averaged density. | ||
* Specific requirements on wall conditioning if any: recent lithium | * Specific requirements on wall conditioning if any: recent 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 | ||
* Any external equipment to be integrated? Provide description and integration needs: | * Any external equipment to be integrated? Provide description and integration needs: | ||