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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.”
A.A. Kabantsev, V.B. Reva, V.G. Sokolov
Fusion Science and Technology | Volume 35 | Number 1 | January 1999 | Pages 185-189
Oral Presentations | doi.org/10.13182/FST99-A11963848
Articles are hosted by Taylor and Francis Online.
We report the first experimental verification of the magnetohydrodynamic (MHD) dynamo in the axisymmetric linear machine. The dynamo phenomenon, in which the magnetic-field-aligned electric current is self-generated by plasma dynamics, has been a puzzle not only in astrophysical plasmas, but also in magnetically confined laboratory plasmas for many decades. The mirror trap axisymmetric plasma, in which the unstable differential rotation of plasma column in crossed E×B fields excites the helical MHD turbulence, is a new and particularly vivid example of the dynamo effect.
By manipulating the trap's magnetic and plasma conditions, we have obtained both the parallel and the antiparallel to the magnetic field electric current with density to the order of 100 A/cm2 (total current up to 6 kA) in the plasma. The measured mean electromotive force Fem has linear dependence from the turbulent diffusion coefficient DT (r,t) and reachs up to 50 V/m. By measuring each term of Fem, the parallel MHD mean-field Ohm's law has been observed to hold within experimental error bars during plasma flow pulse. A comprehensive physical picture of the dynamo phenomenon has been obtained.