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TJ-II: Why fast reaction of plasma fluctuations to ECRH ?: Difference between revisions
TJ-II: Why fast reaction of plasma fluctuations to ECRH ? (view source)
Revision as of 11:45, 16 October 2019
, 16 October 2019→Description of the activity
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== Description of the activity == | == Description of the activity == | ||
Why do ERCH/ ICRH avoid core impurity accumulation?. Significant progress has been reported regarding the physics understanding of empirical actuators like core heating to avoid impurity accumulation, including the following mechanisms: 1) A reduction of the background density gradient, leading to a reduction of the inward (neoclassical) convection of impurities; 2) An increase of turbulent diffusion; 3) The amplification of core temperature screening which would be relevant in core alpha-heating regimes; 4) The development of core plasma potential flux surface asymmetries. | Why do ERCH/ ICRH avoid core impurity accumulation?. Significant progress has been reported regarding the physics understanding of empirical actuators like core heating to avoid impurity accumulation, including the following mechanisms: 1) A reduction of the background density gradient, leading to a reduction of the inward (neoclassical) convection of impurities; 2) An increase of turbulent diffusion; 3) The amplification of core temperature screening which would be relevant in core alpha-heating regimes; 4) The development of core plasma potential flux surface asymmetries. | ||
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From the theoretical perpective we should consider two mechanisms: | From the theoretical perpective we should consider two mechanisms: | ||
The role of phase space driven instabilities <ref>S. Itoh and K. Itoh Scientific Reports 2, 860 (2012)</ref> and the role of plasma gradient driven instabilities <ref>Trapped Electron Modes (TEM) E. Sánchez et al., Nucl Fusion 59, 076029 (2019)</ref>. | The role of phase space driven instabilities <ref>S. Itoh and K. Itoh Scientific Reports 2, 860 (2012)</ref> and the role of plasma gradient driven instabilities <ref>Trapped Electron Modes (TEM) E. Sánchez et al., Nucl Fusion 59, 076029 (2019)</ref>. | ||
From the experimental perspective the goal is the investigation of the influence of ECRH on / off power heating power in the dynamics of edge & core fluctuations and transport and model validation including: 1) Level of fluctuations, 2) Phase relation between density and potential fluctuations, 3) Turbulent ExB transport. | |||
== International or National funding project or entity == | == International or National funding project or entity == | ||