TJ-II: Combining retarding-field energy analyzer and electrostatic probes measurements, an approach to measure the phase relation between density and temperature fluctuations using RFA?: Difference between revisions
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'''Goal'''. We propose to explore the feasibility of measuring the phase relation between density and temperature fluctuations using a combined diagnostic based on Retarting Field Analyzer (RFA) and Langmuir probes that has been recently developed in the TJ-II stellarator. | '''Goal'''. We propose to explore the feasibility of measuring the phase relation between density and temperature fluctuations using a combined diagnostic based on Retarting Field Analyzer (RFA) and Langmuir probes that has been recently developed in the TJ-II stellarator. | ||
In addition, the unique capabilities of the dual HIBP system would allow the investigation of density and potential fluctuations in the TJ-II stellarator, from plasma core to plasma edge. Simultaneous, spatially overlapping, measurement of plasma parameters, using HIBP and electrostatic probes, would allow novel probe configurations [e | In addition, the unique capabilities of the dual HIBP system would allow the investigation of density and potential fluctuations in the TJ-II stellarator, from plasma core to plasma edge. Simultaneous, spatially overlapping, measurement of plasma parameters, using HIBP and electrostatic probes, would allow novel probe configurations [i.e. baffled probes <ref>V.I. Demidov et al., Contrib. Plasma Phys. 44 (2004) 689</ref>] to be tested, and would provide plasma boundary conditions for HIBP calibration. | ||
== International or National funding project or entity == | == 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: | * Number of plasma discharges or days of operation: 2 | ||
* Essential diagnostic systems: RFA, Probes | * Essential diagnostic systems: RFA, Probes. HIBP operation is also highly desirable. | ||
* Type of plasmas (heating configuration): ECRH with density ramp-up and ramp-down to include electron-ion root transitions | * Type of plasmas (heating configuration): ECRH with density ramp-up and ramp-down to include electron-ion root transitions | ||
* Specific requirements on wall conditioning if any: no | * Specific requirements on wall conditioning if any: no | ||