Space-charge neutralization in ion undulator linear accelerator

RF undulator accelerator (UNDULAC-RF) is suggested as an initial part of high intensity ion linac. In UNDULAC ion beam is accelerated by the combined field of two non-synchronous harmonics. Accelerating force value is proportional to squared particle charge and oppositely charged ions with the identical charge-to-mass ratio can be accelerated simultaneously within the same bunch. In this paper the process of acceleration and focusing the positive and negative charged ions is discussed.