Onset condition of thermoelectric instability in divertor tokamaks

N. Hayashi, T. Takizuka, A. Hatayama, M. Ogasawara

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10 Citations (Scopus)


The onset condition of a thermoelectric instability in divertor tokamaks has been studied analytically and numerically by using a five point model based on SOL and divertor plasmas. The SOL current due to the thermoelectric effect causes the thermoelectric instability and destabilizes the symmetric equilibrium of the SOL and divertor plasmas below a critical divertor plasma temperature. The critical temperature of the thermoelectric instability is equal to or higher than that of the thermal instability due to the divertor radiation, and depends on the midplane SOL plasma temperature and the divertor radiation loss. Below the critical temperature, stable asymmetric equilibria are obtained. As the degree of the asymmetry in the divertor plasma temperature increases, the SOL current has no effect on the instability, or even stabilizes the equilibrium. The SOL current generates spontaneously the divertor asymmetry through the thermoelectric instability.

Original languageEnglish
Pages (from-to)1695-1709
Number of pages15
JournalNuclear Fusion
Issue number11
Publication statusPublished - 1998 Dec 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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