DYNAMICS OF 28.5 GeV ELECTRON AND POSITRON BEAMS IN A METER-LONG PLASMA
نویسندگان
چکیده
A plasma wakefield accelerator (PWFA) experiment is conducted at the Stanford Linear Accelerator Center. The experiment aims at studying the issues relevant to a meter-long plasma accelerator module in the context of an actual high-energy collider. The transverse dynamics issues include transport and focusing of the beam. The longitudinal dynamics issues are the loss and gain of energy by the beam particles. Other physical phenomena such as the emission of radiation by the beam particles along their betatron motion, the steering of the electron beam when crossing a plasma/gas boundary, the beam impact ionization of neutral gases, and the light emitted by the plasma are also studied. Some of the experimental results obtained with electrons or positrons are presented.
منابع مشابه
A Monitor of the Focusing Strength of Plasma Lenses using MeV Synchrotron Radiation ?
The focusing strength of plasma lenses used with high energy electron or positron beams can give rise to synchrotron radiation with critical energies in the MeV range. A method is described for measuring the characteristic energy of this radiation as a way of monitoring the strength of the focus. The principle has been implemented in a plasma lens experiment with a 28.5 GeV positron beam.
متن کاملPositron Beam Propagation in a Meter Long Plasma Channel
Recent experiments and simulations have shown that positron beams propagating in plasmas can be focused and also create wakes with large accelerating gradients. For similar parameters, the wakes driven by positron beams are somewhat smaller compared to the case of an electron beam. Simulations have shown that the wake amplitude can be increased if the positron beam is propagated in a hollow pla...
متن کاملEnergy loss of intergalactic pair beams: Particle-in-Cell simulation
Aims. The change of the distribution function of electron-positron pair beams determines whether GeV photons can be produced as secondary radiation from TeV photons. We will discuss the instabilities driven by pair beams. Methods. The system of a thermal proton-electron plasma and the electron-positron beam is collision free. We have, therefore, used the Particle-in-Cell simulation approach. It...
متن کاملExperimental Plasma Wake-field Acceleration Project at the Vepp-5 Injection Complex
The project of an experimental facility based on the VEPP-5 injection complex is described. Due to a good quality of electron or positron beams and special beam preparation system, the facility opens several possibilities for studies of the plasma wakefield acceleration: high peak beam currents, arbitrary beam profiles, long term beamplasma interaction (up to the full driver depletion), and pre...
متن کاملPositron Source from X-rays Emitted by Plasma Betatron Motion
A new method for generating positrons has been proposed that uses betatron X-rays emitted by an electron beam in a high-K plasma wiggler. The plasma wiggler is an ion column produced by the head of the beam when the peak beam density exceeds the plasma density. The radial electric field of the beam blows out the plasma electrons transversely, creating an ion column. The focusing electric field ...
متن کامل