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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.”
Yasumasa Tsuji
Fusion Science and Technology | Volume 24 | Number 4 | December 1993 | Pages 366-374
Technical Paper | Plasma Engineering | doi.org/10.13182/FST93-A30187
Articles are hosted by Taylor and Francis Online.
The helical force-free equation, ∇ × B = αB, has been solved analytically in a toroidal coordinates system for a torus of arbitrary aspect ratio without the approximation of a large aspect ratio. The three-dimensional force-free equation is reduced to a scalar Helmholtz equation. A set of analytical solutions for the Helmholtz equation in the torus is presented. With these solutions, the eigenvalues have been obtained for an aspect ratio R/a ≥ 7.5 and toroidal mode number −5 ≤ n ≤ 14. The difference in the eigenvalue between a torus and a cylinder becomes large in the case of a small aspect ratio and a large toroidal mode number. However, the smallest eigenvalues and the corresponding toroidal wave numbers are found to be in close agreement with those of a cylinder for R/a ≥ 1.5.
