Abstract: A high-frequency magnetic field generator/detector equipped with a saddle type coil assembly which comprises a combination of two similar windings having power supply terminals at one axial end thereof and load terminals at radially symmetrical positions of the other end thereof, wherein a first impedance-matching capacitor is connected between the power supply terminals, while a second impedance-matching capacitor is connected between the load terminals, and a coaxial cable having an electrical length equivalent to a half wavelength is connected between the power supply terminals, thereby matching the input and output impedances with each other.

Abstract: A standing-wave accelerator including a plurality of accelerating cavities arranged along the axis direction of the accelerator; a plurality of coupling cavities provided between the two-adjacent accelerating cavities; at least one of the coupling cavities is provided with a detuning device for detuning the coupling cavity; and the detuning device is provided to be inserted from a first wall of the coupling cavity to extend until it comes into contact with a second wall thereof, spacedly passed between a pair of inwardly projecting posts.