THE TIME-STRUCTURE MEASUREMENT OF THE 50-MEV PULSED PROTON-BEAM USINGA SINGLE TOROIDAL COIL

We have investigated the time structure of the 50-MeV pulsed proton be am delivered from the MC-50 cyclotron at the Korea Cancer Center Hospi tal. By placing a single toroidal coil behind the mylar window at the exit port of the target chamber, we measured both the repetition perio d and the width of the pulsed beam. The glass toroid, which was wound with 18 turns of wire, was designed to beef the air-filled type so tha t it could better respond to high frequency. To explain the time depen dence, as well as the peak voltage, of the observed signal, we perform ed a numerical analysis based on elementary electromagnetic theory. Th e result convinces us that the width and the repetition period of the pulsed beam can be reliably determined by the present method.