TJ-II: Two dimensional distribution of plasma potential and density

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Experimental campaign

2021

Proposal title

TJ-II: Two dimensional distribution of plasma potential and density

Name and affiliation of proponent

Kutchatov HIBP team

Kharkov HIBP team

Ciemat team

Details of contact person at LNF

If applicable, enter contact person here or write N/A

Description of the activity

The first experiments aimed at obtaining the 2D distribution of plasma potential were performed in TJ-II using Heavy Ion Beam Probe (HIBP) with the variation of two parameters: plasma entrance angle and the energy of the Cs+ probing beam in the range 128-148 keV [1].

During 2019-20 the dual HIBP system has been used to experimentally characterize the 2D structures of plasma potential and density mean-value distributions and fluctuations in TJ-II mapped by varying the beam energy in a wider range 100 -150 keV.

The goal of this proposal is to expand the HIBP energy range [80 - 200 keV] to explore the whole TJ-II poloidal cross-section.

International or National funding project or entity

If applicable, enter funding here or write N/A

Description of required resources

Required resources:

• Number of days of operation: 3

• Essential diagnostic systems: Dual HIBP [May / June]

• Type of plasmas (heating configuration): ECRH & NBI

• Wall conditioning: Sufficient density control for good reproducibility in NBI plasmas.

Preferred dates and degree of flexibility

Preferred dates: (format dd-mm-yyyy)

References

  1. R. Sharma et al., Physics of Plasmas 27, 062502 (2020)

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