Conclusions

distribution has T|| >> Te

Validated by X-ray spect

Programmable Models for Real-Time, Reconfigurable I/O (RIO) Plasma Control

References

[1] L. Zheng, W. Horton, H. Miura, T. H. Shi and H. Q. Wang, Nonneutralized charge effects on tokamak edge

magnetohydrodynamic stability, Phys. Letts A 380, 2654-2657 (2016).

[2] ] W. Horton, M. Goniche, Y. Peysson, J. Decker, A. Ekedahl, and X. Litaudon,

Phys. Plasmas 20, 112508 (2013) and J. Decker, Y. Peysson et al. PoP 21, 092504 (2014)

[3] I. Keramidas Charidakos, F. Waelbroeck, and P. J. Morrison, “Hamiltonian Five-Field Gyrofluid Model”, Phys. Plasmas 22,

112113 (2015)

[4] T. Kroetz, M. Roberto, I. L. Caldas, R. L. Viana, P. J. Morrison, “Integrable Maps with Non-Trivial Topology: Application to

Divertor Configurations”, Nuclear Fusion 50, 034003 (14pp(2010)

and.

W. Horton , L. Zheng, A. Arefiev, C. Michoski, P. J. Morrison and F. L. Waelbroeck

1institute For Fusion Studies, University Of Texas At Austin, Austin, Texas, USA

Email: Horton@physics.utexas.edu

j

fe(x, p||, p^ ,t)

Non-neutralized electrons confined in closed field line repel each other giving a linked spring model of stabilizing The repulsion between electrons leads to an hoop forces -- similar to the thermal pressure electric potential. The effective pressure gradient in model Shrinks the Unstable domain in the MHD Balloong mode stability equation Ref. 1

Steady State Turbulent ITER-like Plasmas with RF Drivers

LHCD shown as an effective method to maintain stable control tokamak current profiles is in a stable steady-state. Ref.2 With properties:

- Efficient and Synergistic steady-state heating and current control

current penetration aided by ETG plasma density fluctuations

- ETG turbulence modified by the RF driven three-component electron phase

space density function f3T (p|| p, r, t; PRF ) from RF power PRF(t).

(i ) Radial gradients of the moments j|| (r ), Te || (r ), Te (r ) and q|| (r) change the

complex stability problem for the low frequency electromagnetic turbulence and

the associated transport.

(ii) Turbulent pitch-angle scattering from magnetic turbulence weakens the

current drive efficiency but provides stability against the runaway currents of

induction driven toroidal currents.

TH/P3-30

IAEA Kyoto

TH/P3-30

Acknowledgments:

The work is supported by the Institute for Fusion Studies thru the Dept of Energy Grant DE-FG02-04ER54742.

The simulations were performed at TACC, NERSC Computer Center and the Cadaradce-IRFM Computers.

Collaborations with Aix-Marseille University, France and Sao Paulo University, Brazil.

I -Mode physics with increase stability and low noise inside Separatrix

Non-neutralized electron

effects • Non-neutralized electrons confined in closed field line

repulse each other and behave as if a linked spring system (Fig.2a).

• The repulsion between electrons leads to an outward hoop force. This is similar to the thermal pressure (Fig.2b).

• This repulsive force differs from surface to surface, that affects the system magnetic well (Fig.3).

Fig.2a Fig.2b Fig.3

May 10, 2016

Westlake, Hangzhou

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