TJ-II: Turbulent ExB transport studies using HIBP and edge probes

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Experimental campaign

Autumn 2021

Proposal title

TJ-II: Turbulent ExB transport studies using HIBP and edge probes

Name and affiliation of proponent

HIBP Kurchatov (Russia) & Kharkov (Ukrania) teams, Mark Koepke,UWV (USA), M.A. Ochando, J. L. De Pablos, C. Hidalgo (Ciemat)

Details of contact person at LNF

C. Hidalgo (Ciemat)

Description of the activity

The TJ-II stellarator is equipped with a unique diagnostic system - Dual HIBP, consisting of two HIBPs separated toroidally [1]. 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 [Ref]

International or National funding project or entity

Include funding here (grants, national plans)

Description of required resources

Required resources:

  • Number of plasma discharges or days of operation: 2 sessions / days
  • Essential diagnostic systems:HIBP and edge Langmuir probes arrays
  • Type of plasmas (heating configuration):ECRN or / and NBI
  • Specific requirements on wall conditioning if any:
  • External users: need a local computer account for data access: yes/no
  • Any external equipment to be integrated? Provide description and integration needs:

Preferred dates and degree of flexibility

Preferred dates: (format dd-mm-yyyy)

References

  1. A. MELNIKOV, A.V. et al., Heavy ion beam probing - Diagnostics to study potential and turbulence in toroidal plasmas, Nuclear Fusion 57 (2017) 072004.

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