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TJ-II: Influence of magnetic configuration on filament dynamics: Difference between revisions
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TJ-II: Influence of magnetic configuration on filament dynamics (view source)
Revision as of 10:40, 10 December 2020
, 10 December 2020→Description of required resources
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d) Repeat experiments with a magnetic configuration featuring long connection lengths for several cm. after the LCFS. | d) Repeat experiments with a magnetic configuration featuring long connection lengths for several cm. after the LCFS. | ||
From this, an overview of the experimental program would be: | |||
a) In a first day of operation, ECRH and NBI plasmas in standard configuration would be probed replicating previous discharges by Kobayashi et al. In this ocasion, both probes would be used to characterize filaments across the SOL in their respective positions and to measure <math>n_e</math>, <math>\phi_f</math> and <math>T_e</math> profiles to the innermost posible position. Time permitting, polarization experiments could be attempted as well. ''Simultaneously, the GPI system would be used in a slow setting to provide a broad evaluation of <math>n_e</math> and <math>T_e</math> in the edge region and in a fast setting to characterize filamentary structures in the SOL <ref>E. de la Cal and The TJ-II Team 2016 Nucl. Fusion 56 106031</ref>.'' | |||
b) On top of these main diagnostics, profile characterization will be carried out using TS, He beam, ECE, interferometry and profile reflectometry. DR will be used to provide measurements of <math>E_r</math> at the edge, thus complementing probe measurements from floating potential. | |||
c) In a second day of operation, experiments would be repeated once again, using a magnetic configuration featuring enhanced connection length after the separatrix. One viable way to achieve this is to reduce the volume of the magnetically confined region, thus increasing the distance between the LCFS and the limiting elements of the vacuum vessel. | |||
d) In a third day of operation, experiments carried out on the first day would be repeated using a magnetic configuration featuring a low rational in the vicinity of the LCFS, thus creating a set of islands in the edge. These measurements would as well be carried both with normal and reduced volume. | |||
Required resources: | Required resources: | ||
* Number of plasma discharges or days of operation: | * Number of plasma discharges or days of operation: 3 | ||
* Essential diagnostic systems: Dual Langmuir probe system in TJ-II | * Essential diagnostic systems: Dual Langmuir probe system in TJ-II | ||
* Type of plasmas (heating configuration): | * Type of plasmas (heating configuration): ECRH & NBI | ||
* Specific requirements on wall conditioning if any: | * Specific requirements on wall conditioning if any: Sufficient density control for good reproducibility in NBI plasmas. | ||
* External users: need a local computer account for data access: yes | * External users: need a local computer account for data access: yes | ||
* Any external equipment to be integrated? Provide description and integration needs: | * Any external equipment to be integrated? Provide description and integration needs: | ||