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Darleane C. Hoffman, transuranium element pioneer, dies at age 98
Nuclear chemist Darleane D. Hoffman, who was renowned for her research on transuranium elements that advanced the understanding of nuclear fission, died on September 4 at her home in Menlo Park, Calif. She was 98.
Iowa origins: Hoffman was born on November 8, 1926, in Terril, Ia. She attended Iowa State University, where she earned a bachelor’s degree in chemistry in 1948 and a doctorate in physical (or nuclear) chemistry in 1951. She then began working as a chemist at Oak Ridge National Laboratory.
T.D. Akhmetov, V.S. Belkin, E.D. Bender, V.I. Davydenko, G.I. Dimov, A.S. Donin, A.N. Dranichnikov, V.G. Igoshin, A.A. Kabantsev, Yu.V. Kovalenko, A.S. Krivenko, I.I. Morozov, V.B. Reva, V.Ya. Savkin, G.I. Shulzhenko, V.G. Sokolov, M.Yu. Stepanov, S.Yu. Taskaev
Fusion Science and Technology | Volume 35 | Number 1 | January 1999 | Pages 94-98
Topical Review Lectures | doi.org/10.13182/FST99-A11963831
Articles are hosted by Taylor and Francis Online.
Investigation of the hot initial plasma created in an axisymmetric end system of the ambipolar trap AMBAL-M has been completed. In the end mirror we obtained the MHD stable plasma with the electron temperature of 50 eV, ion temperature 200 eV, and density about 1013 cm−3. In an MHD anchor – the semicusp a transverse profile of the plasma pressure favorable for the MHD stability was obtained. Pulsed injection of fast atoms with the current of 100 A demonstrated sufficient accumulation rate of the ion population trapped into the initial plasma. The first experiments with ICR-heating of the initial plasma were carried out.
Two atomic injectors of the end mirror were prepared for work. In these injectors four quasistationary proton beams were obtained with the energy of 25 keV and current of up to 50 A per beam. After their charge-exchange the atomic beams were passed through an MHD stabilizing shell and the target plasma.
Principal vacuum units of the 2-nd stage of the installation were tested and prepaired for assembly. One-half of the magnet-vacuum system of the AMBAL-M central solenoid was assembled and tested for vacuum.