An iron-free linear induction accelerator

Collective Ion Acceleration through Temporal Modulation of Relativistic-Electron-Beam Energy

“…For dy~1/dr\<0, (10) indicates that the phase velocity of a cyclotron wave can be increased, at a rate dependent on the pulse shape of the beamenergy modulation and the distance from the emitter. The wave acceleration described by (10) differs fundamentally from that induced by spatial modulation.…”

“…9 The abil- ity to control the energy of the beam in time is not the simplest requirement on an electronbeam machine, but may be feasible through design of a multielement accelerator or decelerator downstream from the ordinary diode. 10 A more fundamental limitation of this method concerns acceleration to velocities close to c. As mentioned above, there is a lag between introduction of a modulation and the time it reaches the particles, because of finite propagation speed. For V vh^ 0.5c, one can imagine the waves almost outrunning the modulation.…”