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Fusion Science and Technology
Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Craig Beidler, Günter Grieger, Franz Herrnegger, Ewald Harmeyer, Johann Kisslinger, Wolf Lotz, Henning Maassberg, Peter Merkel, Jürgen Nührenberg, Fritz Rau, Jörg Sapper, Francesco Sardei, Ruben Scardovelli, Arnulf Schlüter, Horst Wobig
Fusion Science and Technology | Volume 17 | Number 1 | January 1990 | Pages 148-168
Technical Paper | Stellarator System | doi.org/10.13182/FST90-A29178
Articles are hosted by Taylor and Francis Online.
The future experiment Wendelstein VII-X (W VII-X) is being developed at the Max-Planck-Institut für Plasmaphysik. A Helical Advanced Stellarator (Helias) configuration has been chosen because of its confinement and stability properties. The goals of W VII-X are to continue the development of the modular stellarator, to demonstrate the reactor capability of this stellarator line, and to achieve quasi-steady-state operation in a temperature regime >5 keV. This temperature regime can be reached in W VII-X if neoclassical transport plus the anomalous transport found in W VII-A prevail. A heating power of 20 MW will be applied to reach the reactor-relevant parameter regime. The magnetic field in W VII-X has five field periods. Other basic data are as follows: major radius R0 = 6.5 m, magnetic induction B0 = 3 T, stored magnetic energy W ≈ 0.88 GJ, and average plasma radius a = 0.65 m. Superconducting coils are favored because of their steady-state field, but pulsed water-cooled copper coils are also being investigated. Unlike planar circular magnetic field coils, which experience only a radially directed force, twisted coils are subject to a lateral force component as well. Studies of various superconducting coil systems for Helias configurations have shown that the magnitudes of these radial and lateral force components are comparable. Based on a support model, the mechanical stresses are calculated; all components of the stress tensor are of equal importance. Other studies being conducted are concerned with the many complex engineering aspects presented by the construction of nonplanar superconducting coils.