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2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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Russia withdraws from 25-year-old weapons-grade plutonium agreement
Russia’s lower house of Parliament, the State Duma, approved a measure to withdraw from a 25-year-old agreement with the United States to cut back on the leftover plutonium from Cold War–era nuclear weapons.
C. G. Bathke, R. A. Krakowski, K. F. Schoenberg
Fusion Science and Technology | Volume 15 | Number 2 | March 1989 | Pages 1082-1087
Plasma Heating and Current Drive — II | doi.org/10.13182/FST89-A39836
Articles are hosted by Taylor and Francis Online.
The property of reversed-field pinches (RFPs) to relax to a near-minimum-energy state is the basis of oscillating-field current drive (OFCD), wherein plasma current is driven by modulating in quadrature the external toroidal and poloidal magnetic fields. Coupled plasma/circuit OFCD simulations of RFPs ranging from present experiments (ZT-P and ZT-40M) to the reactor (TITAN) indicate that the drive frequency and the amplitude of the plasma-current oscillations decrease and the “wall-plug” current-drive efficiency increases with decreased plasma resistance so that minimum frequencies (∼25 Hz) and plasma-current amplitudes (∼1.6%) and maximum efficiencies (∼0.3 A/W) are attained in the reactor regime. Methods for minimizing the reactive powers and for optimizing the current-drive efficiency for OFCD in RFPs have been identified.