TJ-II:Why fast particle electromagnetic induced stabilization in fusion plasmas?

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Experimental campaign

2019 Autumn

Proposal title

Why fast particle electromagnetic induced stabilization in fusion plasmas?

Name and affiliation of proponent

CIEMAT, Kurchatov HIBP team, Kharkov HIBP team

Details of contact person at LNF

Alvaro Cappa, Carlos Hidalgo

Description of the activity

Fast ions have been found to impact plasma confinement [1]. Understanding the underlying physics is an essential task for future fusion reactors where plasmas will be dominated by fast particle dynamics. In particular, non-linear excitations of zonal structures by fast particle driven modes are predicted to play an important role on the nonlinear dynamics of AEs and related transport [2].

Non-linear coupling between AEs and low frequency zonal flows have been reported in TJ-II using Doppler reflectometry [[3]] and HIBP measurements.

The goal is to address the following questions:

1. Relation between fast particle driven modes and zonal structures: Is there any evidence of Zonal Flows (i.e. electric fields) or / and Zonal Fields (i.e. magnetic fields) driven by fast particles?. If yes, do they play any role on thermal transport Impact?

2. Non-linear interplay between high (AEs) and low frequency modes: do they play any role in the non-linear saturation mechanisms of AEs?

Experiment will be carried out in plasma scenarios with different AEs control knobs, including: ECRH power, on and off axis ECCD, plasma density and magnetic configuration [4].

International or National funding project or entity

If applicable, enter funding here or write N/A

Description of required resources

Required resources:

  • Number of plasma discharges or days of operation:
  • Essential diagnostic systems:
  • Type of plasmas (heating configuration):
  • 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. J. Citrin et al., PRL 111 (2013) 155001
  2. Z Qiu et al., PRL 120 (2018) 135001
  3. T. Estrada et al., NF 55 (2015) 063005
  4. A. Cappa, Physics Meeting October 14th 2019

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