Effects of alpha populations on tokamak ballooning stability

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Fusion product alpha populations can significantly influence tokamak stability due to coupling between the trapped alpha precessional drift and the kinetic ballooning mode frequency. This effect is of particular importance in parameter regimes where the alpha pressure gradient begins to constitute a sizable fraction of the thermal plasma pressure gradient. Careful, quantitative evaluations of these effects are necessary in burning plasma devices such as the Tokamak Fusion Test Reactor and the Joint European Torus, and we have continued systematic development of such a kinetic stability model. In this model we have considered a range of different forms for the alpha ... continued below

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Pages: 47

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Spong, D.A.; Sigmar, D.J.; Tsang, K.T.; Ramos, J.J.; Hastings, D.E. & Cooper, W.A. January 1, 1986.

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Description

Fusion product alpha populations can significantly influence tokamak stability due to coupling between the trapped alpha precessional drift and the kinetic ballooning mode frequency. This effect is of particular importance in parameter regimes where the alpha pressure gradient begins to constitute a sizable fraction of the thermal plasma pressure gradient. Careful, quantitative evaluations of these effects are necessary in burning plasma devices such as the Tokamak Fusion Test Reactor and the Joint European Torus, and we have continued systematic development of such a kinetic stability model. In this model we have considered a range of different forms for the alpha distribution function and the tokamak equilibrium. Both Maxwellian and slowing-down models have been used for the alpha energy dependence while deeply trapped and, more recently, isotropic pitch angle dependence have been examined.

Physical Description

Pages: 47

Notes

NTIS, PC A03/MF A01.

Source

  • Symposium on the role of alpha particles in magnetically confined fusion plasmas, Goteborg, Sweden, 24 Jun 1986

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  • Other: DE86014235
  • Report No.: CONF-8606186-1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5450903
  • Archival Resource Key: ark:/67531/metadc1064453

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  • January 1, 1986

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 23, 2018, 6:19 p.m.

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Spong, D.A.; Sigmar, D.J.; Tsang, K.T.; Ramos, J.J.; Hastings, D.E. & Cooper, W.A. Effects of alpha populations on tokamak ballooning stability, article, January 1, 1986; United States. (digital.library.unt.edu/ark:/67531/metadc1064453/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.