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From Phase Locking to Phase Slips: A Mechanism for a Quiescent H mode

Z. B. Guo and P. H. Diamond
Phys. Rev. Lett. 114, 145002 – Published 6 April 2015

Abstract

We demonstrate that E×B shear, VE×B, governs the dynamics of the cross phase of the peeling-ballooning-(PB-)mode-driven heat flux, and so determines the evolution from the edge-localized (ELMy) H mode to the quiescent (Q) H mode. A physics-based scaling of the critical E×B shearing rate (VE×B,cr) for accessing the QH mode is predicted. The ELMy H mode to the QH-mode evolution is shown to follow from the conversion from a phase locked state to a phase slip state. In the phase locked state, PB modes are pumped continuously, so bursts occur. In the slip state, the PB activity is a coherent oscillation. Stronger E×B shearing implies a higher phase slip frequency. This finding predicts a new state of cross phase dynamics and shows a new way to understand the physics mechanism for ELMy to the QH-mode evolution.

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  • Received 17 December 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.145002

© 2015 American Physical Society

Authors & Affiliations

Z. B. Guo1,* and P. H. Diamond1,2

  • 1WCI Center for Fusion Theory, NFRI, Daejeon 305-333, South Korea
  • 2CMTFO and CASS, University of California, San Diego, California 92093, USA

  • *Corresponding author. guozhipku@gmail.com

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Vol. 114, Iss. 14 — 10 April 2015

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