A Four Gap Synchrotron RF Cavity

A proposed four gap synchrotron cavity is described here. The drift tube (140?? long) is rigidly supported by a reentrant conducting structure near each end. Each support structure provides two accelerating gaps. The potential across each gap is approximately the same as the potential between the drift tube and the vacuum tank wall in the central region. The reentrant feature has the effect of a two-turn center tapped transformer, which is achieved in the cavity by passing one current surface through another by means of spokes and holes.