Abstract
A new design concept aims to improve the voltage stand-off by using two repositioned 9-inch Al2O3 windows, to avoid/reduce the neutron impact on the ceramic by moving the window far from antenna, and to reduce the nearby E-fields by optimizing the shape of the conducting structures. New RF windows position is found to be close to the voltage node and determined from the standing wave patterns at the most used frequency of 36.5 MHz. The return loss coefficient S11 is between -30 and -55 dB for the whole operating frequency range. The calculated power losses for the new RF window structures are less than 0.13 kW each at 1 MW of incident power. Modelling shows maximum E-field less than 1.9 kV/mm in a torus and private vacuum of the feedthrough. The dimensions, E-fields and transmission make this design relevant to a possible DEMO ICRF system.
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