A new concept for the 4-vanes RFQ transverse section design is introduced and tested. It consists in thickening the electrode tip, resulting in a looking like ‘crocodile’ profile of this region. The original benefit that was expected is to make possible the reduction of the cavity size for a given frequency. Another interest of this principle is to bring the possibility of compensating the longitudinal mean aperture variation by modifying the electrode tip geometry while keeping the outer quadrant unchanged.
This paper presents the results of tests of these two approaches applied at two resonance frequencies, 88 and 176 MHz.
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