TJ-II:Influence of electron / ion root and ion mass on the radial and frequency structure of zonal flows in TJ-II

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Experimental campaign

2018 Spring

Proposal title

Influence of electron / ion root and ion mass on the radial and frequency structure of zonal flows in TJ-II

Name and affiliation of proponent

B. Liu [Southwest Jiaotong University, China], U. Losada, R. Gerrú, T. Kobayashi [NIFS], B. van Milligen, T. Estrada et al.,

Details of contact person at LNF (if applicable)

Enter contact person here or N/A

Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)

Results reported in the TJ-II plasma edge region have shown, with unprecedented detail, how sensitive are the properties of zonal flows to plasma conditions providing key experimental guidance for model validation [1].

In two plasmas produced by different heating (ECRH and NBI) schemes and characterized by different mean radial electric field structures, frequency-space-decomposed spectra of the global potential oscillation has been analyzed. In both cases, the oscillatory field has a monopole potential structure and a dipole radial electric field structure in the edge region. The width of the oscillating structure depends on its frequency as well as the heating scheme. As the frequency decreases, the oscillating structure asymptotically approaches to the mean profile.

Whether this sensitive is due to the magnitude / sign of radial neoclassical electric fields affecting Reynolds stress driven ZFs, neoclassical mechanisms, plasma collisionality, plasma profile effects or / and fast particle effects remain an open question.

If applicable, International or National funding project or entity

Enter funding here or N/A

Description of required resources

Required resources:

  • Number of plasma discharges or days of operation: 3 days
  • Essential diagnostic systems:edge probes, Doppler and HIBP
  • Type of plasmas (heating configuration): ECRH in electron and ion root scenarios
  • 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 ==20-05-2018

References

  1. Kobayashi, Losada, Liu et al., 2018

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