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VERSION:2.0
PRODID:-//Memento EPFL//
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SUMMARY:Origin of tokamak density limit scalings
DTSTART:20121203T103000
DTEND:20121203T113000
DTSTAMP:20260429T200022Z
UID:1f30ff5ca4302674116fa922710e64daa5dee536a219ab3b8597e542
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. David Gates\, Princeton Plasma Physics Laboratory.\, Princ
 eton\, USA\nThe empirical scaling law of the density limit in tokamaks and
  reversed-field pinches has long been known and is a surprisingly robust e
 xperimental result [1]. Whereas the form of the empirical scaling evolved 
 over decades of experimental activities\, the physics mechanism for the on
 set of the density limit has remained elusive. A novel theoretical approac
 h has been recently proposed\, in which the onset criterion for radiation 
 driven islands in combination with a simple cylindrical model of tokamak c
 urrent channel behavior is consistent with the empirical scaling of the Gr
 eenwald density limit. This quantitative model is derived from a power bal
 ance condition between Ohmic heating and radiative losses in the island in
 terior\, and sheds light at the phenomenon that may underlie the density l
 imit and which is common to all reactor schemes. The development of this a
 nalytical model also provides - for the first time - a predictive capabili
 ty that identifies critical local variables and is capable of relating the
 se to global engineering parameters.
LOCATION:PPB 019
STATUS:CONFIRMED
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