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

Experimental campaign

2019 Autumn

Proposal title

Searching for AEs suppression scenarios using off-axis ECCD

Name and affiliation of proponent

Á. Cappa, C. Hidalgo, E. Ascasíbar (Laboratorio Nacional de Fusión)

Details of contact person at LNF

Á. Cappa

Description of the activity

Figure 1.

The goal of the proposal is to find ECRH launching configurations for which the amplitude of NBI-driven Alfvén Eigenmodes is mitigated. In this particular case we intend to investigate the effect of off-axis ECCD at different plasma radius. The heating power set-up shown in figure 1 will allows us to investigate the effect of ECCD with different combinations of power and ECCD efficiency. Studies of coupling between NBI-driven AEs and low frequency zonal flows will benefit from scenario in which AEs activity can be altered without inducing large changes in plasma conditions.

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: One day - 20 useful shots
• Essential diagnostic systems: Besides the common shot to shot diagnostics (ECE, Thomson, Interferometry, Radiation), all systems providing edge plasma profiles are needed. Moreover, HIBP, Doppler Reflectometer, Mirnov coils (both helicoidal and poloidal arrays) and CNPA meaurements are mandatory. MSE would also be desirable to measure changes induced by ECCD.
• Type of plasmas (heating configuration): ECRH + NBI-1 hydrogen plasmas following the heating scheme shown in Figure 1.
• 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: No preferred dates at the time of the proposal submission

(format dd-mm-yyyy)

References

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