PPPL-4165 is available in <a href="PPPL-4165.pdf">pdf</a> format (804 KB).

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<b>Spherical Torus Design Point Studies</b>
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<b>Authors:</b> C. Neumeyer, Y-K.M. Peng, C. Kessel, and P. Rutherford
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<b>Date of PPPL Report:</b> June 2006
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The development path for the Spherical Torus (ST) is envisioned to lead to a Component Test Facility (CTF) (Peng et al 2005 Plasma Phys. Control. Fusion <b>47</b> B263), and possibly to an ST-based DEMO. The progression from present day ST experiments, such as the National Spherical Torus Experiment (NSTX) (Synakowski et al 2004 Nucl. Fusion <b>43</b> 1648), and the Meg-Ampere Spherical Tokamak (MAST) (Lloyd et al 2004 Plasma Phys. Control. Fusion <b>46</b> B477) through intermediate devices to the CTF and DEMO needs to be guided by strategic consideration of scientific and technological steps which can be taken along the way with an appropriate balance of advancement versus risk. Parametric studies are an essential part of this process, and must be performed using methods which are efficient but comprehensive enough to capture key physics and engineering details using a common method to evaluate design point options over a wide range. This article describes the <q>systems code</q> methodology developed by the authors starting from prior work by others (Jardin et al 2003, Fusion Sci. Tech. <b>43</b>) and then improved in terms of physics and engineering algorithms and mathematical approach. In addition, some benchmarking and design point results are presented.






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