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(EX/C3-2) Core and Edge Aspects of Quiescent Double Barrier Operation on DIII-D, with Relevance to Critical ITB Physics Issues

E.J. Doyle1), T.A. Casper2), K.H. Burrell3), C.M. Greenfield3), W.P. West3), R.V. Budny4), J.C. DeBoo3), A.M. Garofalo5), P. Gohil3), R.J. Groebner3), A.W. Hyatt3), G.L. Jackson3), T.C. Jernigan6), J.E. Kinsey7), L.L. Lao3), C.J. Lasnier2), J.-N. Leboeuf8), T.C. Luce3), M.A. Makowski2), G.R. McKee9), R.A. Moyer10), M. Murakami6), T.H. Osborne3), W.A. Peebles1), C.C. Petty3), M. Porkolab11), G.D. Porter2), T.L. Rhodes1), J.C. Rost11), D.L. Rudakov10), G.M. Staebler3), E.J. Strait3), M.R. Wade6), G. Wang1), J.G. Watkins12), L. Zeng1)
1) University of California, Los Angeles, Los Angeles, USA
2) Lawrence Livermore National Laboratory, Livermore, California, USA
3) General Atomics, San Diego, California, USA
4) Princeton Plasma Physics Laboratory, Princeton, New Jersey, USa
5) Columbia University, New York, New York, USA
6) Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
7) Lehigh University, Bethlehem, Pennsylvania, USA
8) Physics Department, University of California, Los Angeles, Los Angeles, California, USA
9) University of Wisconsin, Madison, Madison, Wisconsin, USA
10) University of California, San Diego, La Jolla, California, USA
11) Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
12) Sandia National Laboratories, Albuquerque, New Mexico

Abstract.  This paper reports on the progress in the areas of internal transport barrier (ITB), Quiescent H-mode (QH-mode) and Quiescent Double Barrier (QDB) research on DIII-D. The QDB regime combines core transport barriers with an ELM-free, quiescent H-mode edge, resulting in sustained high performance operation ( $ \beta_{N}^{}$H89 product of 7 for 10 confinement times). These QDB discharges are of interest as: (a) They provide a convincing demonstration of quasi-steady-state ITB operation for >3.5 s, or $ \sim$ 25 confinement times, limited only by NBI pulse length. (b) The QH-mode edge demonstrates that sustained, high-quality ELM-free H-mode operation is possible with density and radiated power control and (c) QDB discharges allow us to investigate critical ITB physics issues such as sustainment, impurity accumulation, theory-based understanding and current drive capability. *Work supported by U.S. DOE under Grants DE-FG03-01ER54615, DE-FG02-89ER53297, DE-FG02-92ER54141, DE-FG03-96ER54373, DE-FG03-95ER54294, DE-FG02-90ER54084, DE-FG03-86ER53225, and Contracts DE-AC03-99ER54463, DE-AC05-00OR22725, W-7405-ENG-48, DE-AC04-94AL85000.

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IAEA 2003