Überlegungen zum bau eines wendellinearbeschleunigers für protonen

Abstract

The method of accelerating heavy particles in a helix wave-guide as repeatedly suggested in literature has been examined theoretically in detail. The first part of this article deals with the HF-characteristics of the wave-guide that were taken from known investigations based on the Pierce theory. A more accurate examination of the acceleration process for protons shows that the accelerating electric field strength on the axis of the helix is strongly reduced for proton energies larger than ca. 30 MeV, while for proton energies smaller than ca. 0.5 MeV the losses in the wave guide are considerably increasing. An acceleration, therefore, will only be advisable for a medium energy range, but here it is equivalent if not superior to other methods. In the case discussed here (acceleration of protons from 1 to 10 MeV) the optimum vacuum wave length was found to be ca. 1.5 m. With a HF-source output of 0.5 MW such an accelerator would have a length of ca. 12m, while the diameter of the shield would be 12 cm, the volume being about 0.15 m 3.