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Abstract

Realistic density profiles in the very periphery of Tokamak discharges have been considered in the study of lower hybrid wave coupling by a waveguide array (grill). The density profile is assumed exponential in the scrape-off region up to the limiter radius and then linear. The effect of a sharp density gradient or of a density discontinuity at the limiter radius is discussed. It is shown that these effects lead to a strong modification of the transmission coefficient which can be adjusted by varying the grill mouth position.

Additional information

Authors: ROMANELLI F, CENTRO RICERCHE ENERGIA FRASCATI (ITALY);SANTINI F CENTRO RICERCHE ENERGIA FRASCATI (ITALY), CENTRO RICERCHE ENERGIA FRASCATI (ITALY)
Bibliographic Reference: WRITE TO ENEA + SERVIZI STUDI E DOCUMENTAZIONE + CENTRO RICERCHE ENERGIA FRASCATI, C.P. 65, 00044 FRASCATI, ROMA (ITALY), MENTIONING REPORT 83.11/P, 1983
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