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Fusion Science and Technology
Latest News
Securing the advanced reactor fleet
Physical protection accounts for a significant portion of a nuclear power plant’s operational costs. As the U.S. moves toward smaller and safer advanced reactors, similar protection strategies could prove cost prohibitive. For tomorrow’s small modular reactors and microreactors, security costs must remain appropriate to the size of the reactor for economical operation.
T. D. Akhmetov, V. I. Davydenko
Fusion Science and Technology | Volume 35 | Number 1 | January 1999 | Pages 121-125
Oral Presentations | doi.org/10.13182/FST99-A11963835
Articles are hosted by Taylor and Francis Online.
We discuss MHD stability of the plasma in the completely axisymmetric end system of AMBAL-M and suggest a physical model to interpret the experimental results. Measurement of the radial plasma pressure profile in the semicusp using a local magnetic probe allowed estimation of the stability safety factor of the end system plasma which occurred to be greater than 3÷4. Gas puffing into the semicusp increases the plasma pressure in this region and hence enhances stability. To explain the observed MHD stability of the end mirror plasma when the MHD stabilizer — semicusp was switched off and the average field line curvature was unfavorable, a model was proposed which assumes that the plasma at the periphery had an electric contact with a limiter. As a result, the potential of flute perturbations vanishes at the plasma periphery. In this case finite Larmor radius effects may stabilize the most dangerous first (global) azimuthal mode because of nonlinear dependence of plasma perturbations on radius.