Abstract: An electromagnet comprises a pair of magnetic pole 1a and 1b, a return yoke 3, exciting coils 4 and 5, etc. In an interior portion of a magnetic pole, plural spacers 2a-2g are provided putting side by side in a horizontal direction. Each of the spaces 2a-2g is an air layer and a longitudinal cross-section is a substantially rectangular shape and the space has a lengthily extending slit shape in a vertical direction against a paper face in FIG. 1. The plural spaces are mainly arranged toward a right side from a beam orbit center O and an interval formed between adjacent spaces is narrower toward the right side. The electromagnet having a simple magnetic pole structure and a wide effective magnetic field area in a case where a maximum magnetic field strength is increased can be secured.

Abstract: The present invention provides apparatus for acceleration of a charged particle beam which includes energy means for altering the energy of a circulating beam circulating in the apparatus and means for extracting output beams from the apparatus. Control means are arranged to be operable to alter the energy of the circulating beam using the energy means so as to be able to extract output beams of at least two energies from the apparatus using the means for extracting. Thus there is provided an accelerator, and an extraction method therefor, which is capable of extracting a small diameter beam having a varying energy level. This facilitates improved medical irradiation treatment using the beam.

Abstract: A circular accelerator is arranged to circulate a charged particle beam through a bending function provided by a bending magnet, set a tune of the charged particle beam being circulated as it is betatron-oscillated to a predetermined value through the effect of a quadrupole magnetic field, resonate the charged particle beam being circulated at the tune set to the predetermined value in a manner to increase an amplitude of the betatron oscillations over the stability limit of resonance, thereby extracting the charged particle beam. The circular accelerator includes a bending magnet formed to generate a quadrupole magnetic field component for horizontally focusing the charged particle beam being circulated and vertically defocusing the beam and another bending magnet formed to generate a quadrupole magnetic field component for horizontally defocusing the charged particle beam being circulated and vertically focusing the beam.

Abstract: Apparatus for desulfurizing and heating molten metal includes a refractory body having an open top receptacle, an outlet and a passageway communicating the receptacle with the outlet. An electric coil is disposed in surrounding relation to the receptacle. The upper end of the coil is disposed generally equal to the level of the molten metal in the receptacle. The molten metal is supplied to the receptacle through a first feed member, and a desulfurizing agent is supplied to the receptacle through a second feed member. Upon excitation of the coil, electric currents are induced in the molten metal to heat it and also to agitate it to mix the desulfurizing agent with the molten metal.

Abstract: A reverberatory furnace includes a reverberatory furnace body for melting metal and holding molten metal, having an opening well, an electromagnetic trough for transporting hot molten metal from the reverberatory furnace body upwardly and slantly, having an inductor for generating a travelling magnetic field, and a guide trough for guiding the hot molten metal from the electromagnetic trough to the opening well. The hot molten metal is circulated through the reverberatory furnace.