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Fusion Science and Technology
ANS members approve amendment adding YMG rep to board of directors
The American Nuclear Society will include a representative from the Young Members Group on its Board of Directors after ANS members voted this week overwhelmingly in favor of amending Article B6 of the ANS bylaws. The change was mandated by Objective Outcome 5 of the ANS Change Plan 2020.
To keep the number of directors at 16, the approved amendment decreased the number of non–U.S. resident directors from three to two.
Taha Houssine Zerguini
Fusion Science and Technology | Volume 4 | Number 1 | July 1983 | Pages 54-63
Technical Paper | Plasma Engineering | dx.doi.org/10.13182/FST83-A22774
Articles are hosted by Taylor and Francis Online.
Sloshing ion distributions are a crucial feature in the end cells of recent tandem mirror reactor designs. They provide the ambipolar potentials that confine central ions and often have the function of making the electron thermal barrier with a potential shape that traps enough cold ions at the midplane for the stabilization of loss cone modes. A perturbation method is developed to find solutions of sloshing-ion distributions. This method uses an expansion in the ratio of electrostatic potential to average ion energy to simplify the bounce-averaged Fokker-Planck equation. The zero'th order equation obtained is separated into equations for the angular and velocity-dependent parts of the distribution function. An analytical solution of the angular equation is derived for small charge-exchange to ionization ratios. For any value of this ratio finite element techniques, which provide rapid numerical solutions for parametric studies of sloshing ions, are used to derive the angular and the velocity distribution functions. The density ratio and the ambipolar potential, as functions of axial distance, are computed from the angular distribution function. There is excellent agreement with results from the Lawrence Livermore National Laboratory bounce-averaged Fokker-Planck code with as much as 500 times less CRAY-1 computer time.