Abstract
Different feeding options for distributed ICRF antenna systems in DEMO are analysed and compared, based on detailed circuit modelling. Voltages and currents (amplitude and phase) are computed for each element of the array. The power delivered by the feeding networks is evaluated characterizing each system. Although the results presented are for a small number of radiating elements, the procedure can be scaled to any arbitrary number of straps and feeding connections. Among the three options analysed (i.e. allfed; distributed; resonant ring) the resonant ring feeding appears to be the most suitable configuration for a traveling wave array distributed antenna system in the DEMO reactor.
Highlights
An Ion Cyclotron Range of Frequency (ICRF) distributed antenna integrated in the blanket of the DEMO reactor is presently considered as a candidate system to heat the central plasma core without density cut-off
In the last section an array fed with one resonant ring is compared to the traveling wave array (TWA) of [1] and a general case of two consecutive resonant rings is studied
The analysis based on the 28 elements array can be generalized to an arbitrary number of radiating elements and sections
Summary
An Ion Cyclotron Range of Frequency (ICRF) distributed antenna integrated in the blanket of the DEMO reactor is presently considered as a candidate system to heat the central plasma core without density cut-off. A large number of radiating elements are used to couple the required power while achieving the low level of power density. The feeding of those elements plays an important role in the overall design of the ICRF system. Integration in the DEMO design requires a detailed analysis of the possible system solutions for the launcher and the corresponding feeding mechanism. The aim of this contribution is to explore some of those possibilities.
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