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TJ-II: Turbulent ExB transport studies using HIBP and edge probes: Difference between revisions
TJ-II: Turbulent ExB transport studies using HIBP and edge probes (view source)
Revision as of 13:21, 1 October 2021
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== Details of contact person at LNF == | == Details of contact person at LNF == | ||
C. Hidalgo (Ciemat) | |||
== Description of the activity == | == Description of the activity == | ||
The TJ-II stellarator is equipped with a unique diagnostic system - Dual HIBP, consisting of two HIBPs separated toroidally <ref>A. MELNIKOV, A.V. et al., Heavy ion beam probing - Diagnostics to study potential and turbulence in toroidal plasmas, Nuclear Fusion 57 (2017) 072004.</ref>. On top of the conventional measurements of the mean value of the plasma electrostatic potential φ, the dual HIBP in TJ-II is capable to measure oscillations of the potential, electron density, magnetic potential and Long Range Correlations as a proxy of Zonal Flows. The HIBP technique turned out to be applicable for measuring several other important plasma quantities too the radial ExB turbulent particle flux. | |||
The goal of this proposal is to investigate the limits of HIBP ExB turbulent transport measurements in the TJ-II stellarator. The experimental strategy will include comparative studies of HIBP and Langmuir probe diagnostics with to goals: | |||
a) Investigation of the poloidal phase velocity of fluctuations using plasma density and plasma potential measurements: HIBP vs probe measurements. | |||
b) Investigation of ExB turbulent transport: HIBP vs probe measurements | |||
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== 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 sessions / days | ||
* Essential diagnostic systems: | * Essential diagnostic systems:HIBP and edge Langmuir probes arrays | ||
* Type of plasmas (heating configuration): | * Type of plasmas (heating configuration):ECRN or / and NBI | ||
* Specific requirements on wall conditioning if any: | * Specific requirements on wall conditioning if any: | ||
* External users: need a local computer account for data access: yes/no | * External users: need a local computer account for data access: yes/no | ||