TJ-II:Searching for AEs suppression scenarios using off-axis ECCD: Difference between revisions

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== Description of the activity ==
== Description of the activity ==
Enter description here <ref>A. Einstein, Journal of Exceptional Results (2017)</ref>, including motivation/objectives and experience of the proponent (typically one-two pages)
Enter description here <ref>A. Einstein, Journal of Exceptional Results (2017)</ref>, including motivation/objectives and experience of the proponent (typically one-two pages)
== Background ==
The goal of the proposal is to find ECRH launching configurations for which the amplitude of
NBI-driven Alfvén Eigenmodes (AEs) is mitigated. Besides the interest that such scenarios have for the fast particles topic, studies of coupling between NBI-driven AEs and low frequency zonal flows may also benefit from them.
Many scenarios making use of different "control" parameters
have already been tested in past experimental sessions, showing always strong changes in AEs activity.
Plasma density variations and changes of the rotational transform profile due to the
many contributions to the total plasma current (NBCD, ECCD, Bootstrap current) are the parameters
with the higher impact. However, although inducing modifications in the general spectrum of the excited modes,
none of the investigated scenarios show a clear possibility to suppress AEs without inducing large
changes in plasma parameters, being the most promising the one employing ECCD.
In this particular case we intend to investigate the effect of
off-axis ECCD at different plasma radius.


== International or National funding project or entity ==
== International or National funding project or entity ==

Revision as of 16:40, 20 January 2022

Experimental campaign

Spring 2022

Proposal title

Searching for AEs suppression scenarios using off-axis ECCD

Name and affiliation of proponent

Enter name, affiliation and ORCID code here

Suggested format:

John Doe, University of Ivory Tower

Details of contact person at LNF

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

Description of the activity

Enter description here [1], including motivation/objectives and experience of the proponent (typically one-two pages)

Background

The goal of the proposal is to find ECRH launching configurations for which the amplitude of NBI-driven Alfvén Eigenmodes (AEs) is mitigated. Besides the interest that such scenarios have for the fast particles topic, studies of coupling between NBI-driven AEs and low frequency zonal flows may also benefit from them. Many scenarios making use of different "control" parameters have already been tested in past experimental sessions, showing always strong changes in AEs activity. Plasma density variations and changes of the rotational transform profile due to the many contributions to the total plasma current (NBCD, ECCD, Bootstrap current) are the parameters with the higher impact. However, although inducing modifications in the general spectrum of the excited modes, none of the investigated scenarios show a clear possibility to suppress AEs without inducing large changes in plasma parameters, being the most promising the one employing ECCD. In this particular case we intend to investigate the effect of off-axis ECCD at different plasma radius.

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:
  • 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. A. Einstein, Journal of Exceptional Results (2017)

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