ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Explore membership for yourself or for your organization.
Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Oct 2025
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
November 2025
Nuclear Technology
October 2025
Fusion Science and Technology
Latest News
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.
M. E. Fenstermacher, N. A. Uckan
Fusion Science and Technology | Volume 4 | Number 2 | September 1983 | Pages 502-506
Plasma Engineering | doi.org/10.13182/FST83-A22913
Articles are hosted by Taylor and Francis Online.
A formalism has been developed in terms of a drift kinetic equation with a Fokker-Planck collision operator to calculate alpha particle loss and energy deposition rate coefficients for one position in space and for steady-state operating conditions in an ELMO Bumpy Torus (EBT) reactor. Pitch angle and energy scattering terms were retained in the collision term so that the analysis provides information on alpha particle behavior due to pitch angle scattering into loss regions in velocity space and information on alpha energy deposition during slowing down in the device. A square well magnetic field shape is assumed and the resulting particle loss rates and energy deposition rates are calculated. For typical EBT reactor parameters, results show that while 80-90% of the alpha particles are scattered into a pitch angle loss region and lost from the device, more than 70% of the alpha particle energy is deposited in the core plasma and about 1–2% goes to alphas retained in the plasma as ash. Parametric studies are performed, and the sensitivity to plasma potential, the pitch angle, the width of loss regions, and computational procedures are analyzed.