caa a22 4500 386367558 CHVBK 20180307111941.0 cr unu---uuuuu 161130e198908 xx s 000 0 eng 10.1017/S0022377800014185 doi S0022377800014185 pii (NATIONALLICENCE)cambridge-10.1017/S0022377800014185 Punjabi Alkesh Department of Mathematics, Hampton University, Hampton, Virginia 23668, U.S.A. A catastrophe-theory study of a two-chamber model for a tokamak scrape-off and divertor [Elektronische Daten] [Alkesh Punjabi] The two-chamber model (TCM) of Singer and Langer is employed to study the plasma transport in the scrape-off and divertor regions of a tokamak. Collisiondominated transport along the field lines is considered, with a. geometric-mean flux-limited expression for parallel electron heat conduction. An analytic method for the catastrophe-theory study of the TCM is developed. Maxwell convention for the catastrophes is adopted. Catastrophes occur when the energy flux entering the divertor chamber from the main plasma scrape-off, the recycling coefficient and the ratio of electron temperatures in the scape-off to that in the divertor exceed some threshold values. It is seen that the behaviour of the plasma during these catastrophes is in qualitative agreement with the experimentally observed features of the plasma during the H-mode transition. Copyright © Cambridge University Press 1989 Journal of Plasma Physics Cambridge University Press 42/1(1989-08), 59-74 0022-3778 42:1<59 1989 42 PLA https://doi.org/10.1017/S0022377800014185 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022377800014185 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Punjabi Alkesh Department of Mathematics, Hampton University, Hampton, Virginia 23668, U.S.A NATIONALLICENCE 773 0- Journal of Plasma Physics Cambridge University Press 42/1(1989-08), 59-74 0022-3778 42:1<59 1989 42 PLA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge