PPPL-3322 is available in <a href="PPPL-3322.pdf">pdf</a> or 
<a href="PPPL-3322.ps">postscript</a> formats.
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<b>Physics Design of the National Spherical Torus Experiment</b>

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Authors: S.M. Kaye, M. Ono, Y.-K. M. Peng, D.B. Batchelor, M.D. Carter, W. Choe, R. Goldston, Y.S. Hwang, E.F. Jaeger, T. Jarboe, S. Jardin, D. Johnson, R. Kaita, C. Kessel, H. Kugel, R. Maingi, R. Majeski, J. Manickam, J. Menard, D.R. Mikkelsen, D. Orvis, B. Nelson, F. Paoletti, N. Pomphrey, G. Rewoldt, S. Sabbagh, D.J. Strickler, E. Synakowski, and J.R. Wilson



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The mission of the National Spherical Torus Experiment (NSTX) is to prove the principles of spherical torus physics by producing high-<font face = "symbol">b</font face = "symbol"><sub>t</sub> plasmas that are non-inductively sustained, and whose current profiles are in steady-state. NSTX will be one of the first ultra low aspect ratio tori (R = a <font face = "symbol"> £ </font face = "symbol"> 1.3) to operate at high power (P<sub>input</sub> up to 11 MW) in order to produce high-<font face = "symbol">b</font face = "symbol"><sub>t</sub> (25 to 40%), low collisionality, high bootstrap fraction (<font face = "symbol">£ 70%</font face = "symbol">) discharges. Both radio-frequency (RF) and neutral-beam (NB) heating and current drive will be employed. Built into NSTX is sufficient configurational flexibility to study a range of operating space and the resulting dependences of the confinement, micro- and MHD stability, and particle and power handling properties. NSTX research will be carried out by a nationally based science team.