Plenary session: Beam dynamics, cooling methods, new methods of acceleration

K.V.Lotov, V.S.Tikhanovich (Budker Institute of Nuclear Physics, Novosibirsk, Russia) Numerical optimization of a plasma wakefield acceleration experiment

The possibility of high acceleration rates has already been demonstrated by plasma wakefield accelerators driven by electron beams. The next necessary step is obviously the demonstration of high acceleration efficiency and good quality of the beam. One possible way to achieve both the efficiency and quality is to prepare matched drive and accelerated beams by removing a central slice from a single high-quality electron bunch (parent beam). For parameters of the parent beam given, the question arises how to maximize the number and energy of accelerated particles and minimize their energy spread and emittance. This question is addressed by LCODE numerical simulations. As a reference point, the design beam parameters of VEPP-5 injection complex are taken. Optimum shape of the beams, required plasma length, achievable energy gain and energy spread are found as functions of the plasma density and parent beam characteristics. The required control accuracy of adjustable beam and plasma parameters is determined.

# Dr. Konstantin Lotov: K.V.Lotov@inp.nsk.su

S.Miginsky (Budker Institute of Nuclear Physics, Novosibirsk, Russia) Optimal Beamlines for Beams with Space Charge Effect

Space charge effect is ever of fundamental importance for low-energy parts of accelerators. Cri- teria of the significance of space charge effect are derived in the presentation. Simple and robust estimations of the emittance degradation in various space charge affected beamlines were ob- tained analytically and numerically. Nonuniform longitudinal and transverse distribution of cur- rent, accelerating and bunching were taken into account. The parameters of optimal beamlines for space charge affected beams were estimated.

Dr. Sergey Vladimirovich Miginsky: S.V.Miginsky@inp.nsk.su

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