@inproceedings{dda788e099514435b3553973c950b880,
title = "Impact of central ECCD on Steady-state hybrid scenario in DIII-D",
abstract = "{"}Steady-state{"} hybrid plasmas in DIII-D with zero surface loop voltage have been maintained for up to two current relaxation times using 3.4 MW of central electron cyclotron current drive (ECCD). In addition to driving ≈0.2 MA of plasma current, central ECCD leads to significant changes in Alfv{\'e}n eigenmode (AE) activity and thermal transport. For neutral-beam-only heating, strong AE activity is observed that causes a ∼35% degradation in the neutron rate. With central ECCD this AE activity is suppressed, replaced by a bursty energetic particle mode that appears more benign as the neutron rate is closer to the classical value. The electron thermal diffusivity increases by ≈50% for 2.4 MW of ECCD compared to neutral-beam-only cases. Fortunately, the global thermal confinement factor remains the same (H98y2=1.4) as the higher thermal transport for PEC=2.4 MW hybrids is offset by the decreased fast ion transport resulting from AE suppression.",
author = "Petty, {C. C.} and R. Nazikian and {Van Zeeland}, {M. A.} and Pace, {D. C.} and Grierson, {B. A.} and Xi Chen and Egemen Kolemen and McKee, {G. R.} and R. Prater and F. Turco",
note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.; 21st Topical Conference on Radiofrequency Power in Plasmas ; Conference date: 27-04-2015 Through 29-04-2015",
year = "2015",
month = dec,
day = "10",
doi = "10.1063/1.4936539",
language = "English (US)",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
editor = "Pinsker, {Robert I.}",
booktitle = "Radio Frequency Power in Plasmas",
}