Rodion Tikhoplav

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First measurements of the breakdown threshold in a dielectric subjected to GV/m wakefields produced by short (30-330 fs), 28.5 GeV electron bunches have been made. Fused silica tubes of 100 microm inner diameter were exposed to a range of bunch lengths, allowing surface dielectric fields up to 27 GV/m to be generated. The onset of breakdown, detected(More)
Microbunching of a relativistic electron beam into a helix is examined analytically and in simulation. Helical microbunching is shown to occur naturally when an e beam interacts resonantly at the harmonics of the combined field of a helical magnetic undulator and an axisymmetric input laser beam. This type of interaction is proposed as a method to generate(More)
We report experimental observation of narrow-band coherent Cherenkov radiation driven by a subpicosecond electron bunch traveling along the axis of a hollow cylindrical dielectric-lined waveguide. For an appropriate choice of dielectric wall thickness, a short-pulse beam current profile excites only the fundamental mode of the structure, producing energetic(More)
We present studies of transverse emittances and electron beam pulse length for various operating points of the electron source: electron beam charge, laser length and spot size, and solenoid settings. We especially study the impact, on transverse emittance, of short Gaussian versus long square temporal distributions of the photocathode drive-laser.
Electron bunches with the unparalleled combination of high charge, low emittances, and short time duration, as first produced at the SLAC Final Focus Test Beam (FFTB), are foreseen to be produced at the SABER facility. These types of bunches have enabled wakefield driven accelerating schemes of multi-GV/m in plasmas. In the context of the Dielectric(More)
M. C. Thompson, 2, ∗ H. Badakov, A. M. Cook, J. B. Rosenzweig, R. Tikhoplav, G. Travish, I. Blumenfeld, M. J. Hogan, R. Ischebeck, N. Kirby, R. Siemann, D. Walz, P. Muggli, A. Scott, and R. Yoder Department of Physics and Astronomy, University of California, Los Angeles, California, 90095, USA 2 Lawrence Livermore National Laboratory, Livermore, California,(More)
* UCLA Department of Physics and Astronomy, Los Angeles, CA 90095-1547 # UCLA Department of Electrical Engineering. Abstract Since typically FEL undulator magnets have period length in the cm range, and the normalized magnetic field strength K is usually close to unity to guarantee a good coupling, a very high energy electron beam is needed to access the UV(More)
A stable pseudo-confocal geometry for recirculation injection by nonlinear gating (RING) of high-energy ultrashort pulses is demonstrated. Implementation of RING in this robust geometry will benefit the development of ultrabright light sources based on inverse Compton scattering by increasing their efficiency. A detailed cavity analysis is presented, and a(More)
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