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Home / Publications / Journals / Fusion Science and Technology / Volume 47 / Number 3

Experiments to Improve Power Conversion Parameters in a Traveling Wave Direct Energy Converter Simulator

Hiromasa Takeno, Yuusuke Kiriyama, Yasuyoshi Yasaka

Fusion Science and Technology / Volume 47 / Number 3 / April 2005 / Pages 450-454

Technical Paper / Fusion Energy - Experimental Devices and Advanced Designs /

An experimental study of direct power conversion for D-3He fusion is presented. In a small-scale simulator of direct energy converter, which is based on a principle of deceleration of 14.7MeV protons by traveling wave field, a new structure of an external transmission circuit in experiment is proposed for the purpose of enhancement of deceleration electrode voltages. A prototype circuit was designed and constructed, resulting improvement of voltage amplitude in an order of magnitude. A more practical circuit, in which inductor elements were manufactured by using coaxial cables, was also constructed and tested. An excitation of the third harmonic frequency with a significant amplitude was observed. The cause of this problem is attributed to the modulated ion beam which has a third harmonic component and fact that the inductance of the element nonlinearly depends on frequency. This problem is serious for a practical scale energy converter, and a careful design of the circuit could avoid the problem.

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