Abstract
The design of a proton beam line for medical science is presented. A proton beam of energy ranging from 150 to 300 MeV is obtained by decelerating the 500-MeV KEK booster synchrotron beam in a carbon energy degrader. Problems associated with the use of the energy degrader in the beam line are discussed in detail. The available proton intensity at 250 MeV is estimated to be 2×109 protons per pulse with a repetition rate of 20 Hz. The beam line provides an achromatic, horizontal beam and a vertical beam. The former is suitable for proton diagnosis, and the availability of both the horizontal and the vertical beam increases the usefulness of proton radiotherapy.
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