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A method is proposed to minimize present scaling laws related uncertainties for identification of the main parameters of ignited tokamak. The method consists mainly in searching an ignition domain which is the intersection of all possible ignition domains corresponding to all possible scaling laws produced by all possible transports. In defining this set of possible transports, an optimistic and a pessimistic bound are established, in between, other theoretical or empirical laws are also considered, but it is shown that these laws have to satisfy strong constraints on their exponents, when written in monomial form. With this restriction, most of the empirical laws drawn today are at the borderline of the previous "acceptable" domain, making extrapolations even more uncertain. It is shown that when taking Alcator law, Drift Tearing Law, and a composite law from observations and theory in the "acceptable" domain, there exists a common set of main parameters defining, for these three laws, an ignition tokamak. The values of the main parameters show that an intermediate ignition step is required. On the other hand, strong constraints on auxiliary heating by Neutral Injection are shown, which requires further developments. Finally, the present analysis, through preliminary, indicates a domain where thermonuclear fusion can be reached in an ignited tokamak.

Additional information

Bibliographic Reference: WRITE TO CEA MENTIONING REPORT EUR-CEA-FC-1232 EN, 1984
Availability: Can be ordered online
Record Number: 1989123104700 / Last updated on: 1987-01-01
Available languages: en