TJ-II:Role of isotope mass on the radial width of Zonal Flows

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Experimental campaign

2019 Spring

Proposal title

Influence of isotope mass and heating scenario on the amplitude and radial width of Zonal Flows

Name and affiliation

Ulises Losada (Ciemat), T Kobayashi (NIFS), B. Liu (ENN, China) and Carlos Hidalgo (Ciemat)

Description

Time-space properties of the global potential oscillation, which is related to the low frequency zonal flows, have been investigated in two plasma scenarios produced by ECRH and NBI heating schemes that are characterized by different mean radial electric field structures.

The width of the oscillating structure strongly depends on the heating scheme [1]. Preliminary results roughly suggest that the radial width of LRC increases with the ion mass in NBI scenarios [2]. Those results show, for the first time and with unprecedented detail, how sensitive are the properties of zonal flows to plasma conditions, providing a key experimental guidance for model validation.

The current database has about 20 discharges (10 in NBI and 10 in ECRH plasmas). As we need to asses the reproducibility of the previous results, the goal of this proposal is to expand the existing database of the width of zonal flows with special emphasis on the isotope mass effect.

Reference plasma pulses: 43702-09; 44202-11

collaboration

collaboration with NIFS: Tatsuya Kobayashi (Japan) and ENN: Bing Liu (People's Republic of China)

Description of required resources

Required resources:

  • Number of plasma discharges or days of operation: 2 days
  • Essential diagnostic systems: dual edge probes, dual HIBP
  • Type of plasmas (heating configuration):ECRH & NBI, H and D operation
  • Specific requirements on wall conditioning if any: same as during the reference discharges
  • External users: need a local computer account for data access: yes (if visitors)

Preferred dates and degree of flexibility

Preferred dates: 20-23, May, 2019


References

  1. T Kobayashi, U Losada, B Liu et al., Nuclear Fusion (2019) in press
  2. U Losada PhD Thesis (2019)

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