S. M. Polozov

JACoW : Beam Dynamics Simulation in Two Versions of New Photogun for FCC-ee Electron Injector Linac

New high-energy frontier project FCC is now under development at CERN. The project includes three modes: ee, hh and eh interactions for FCC. New injection system for FCC-ee is planned to consist of new ~ 2-14 GeV electron linac and electron-positron converter. Injector linac should provide two regimes: ~250 pC bunches for injection and ~6 nC bunches for e-/e+ conversion. Two possible schemes of photogun are comprised and results of beam dynamics simulation in both FCC-ee injection linac photoguns are discussed.

Commissioning of New Light Ion RFQ Linac and First Nuclotron Run with New Injector

In the frames of the NICA project development [1] the old HV fore-injector of the LU-20 linac, which was in operation from 1974, was replaced by the new RFQ accelerator in spring 2016. The first Nuclotron technological run with the new LU-20 fore-injector was performed in June 2016. During the following two runs of total duration of about 2500 hours the proton and deuteron (polarized and unpolarized), lithium and carbon beams were successfully injected and accelerated in the Nuclotron ring. Main results of the RFQ commissioning and experience of its operation are presented in this paper.

Commissioning and First Tests of the New Standing Wave 10 Mev Electron Accelerator

A new linear electron accelerator for industrial applications was developed by the joint team of CORAD and MEPhI. It is based on conventional biperiodical accelerating structure for energy range from 7.5 to 10 MeV and beam power up to 20 kW. The use of modern methods and codes for beam dynamics simulation, raised coupling coefficient and group velocity of SW biperiodic accelerating structure allowed to reach high pulse power utilization and obtain high efficiency. The first two accelerators with the new structure have been installed and tested.

Generation of X-ray radiation during planar channeling of relativistic electrons in crystals

A classical model of the emission of radiation by relativistic electrons in a crystal has been developed using the form of the potential maximally close to its actual form. The dynamics of electrons with energies 20–25 MeV performing channeling in crystals is simulated numerically. The generation of electromagnetic radiation that accompanies this motion has been considered. It has been shown that, in the given electron energy range, this radiation corresponds to the X-ray spectral band with characteristic photon energies of up to 40 keV. The radiation yield is estimated. The requirements to the electron beam parameters are formulated based on the results of the simulation. It has been shown that numerical simulation gives results that correlate with the analytic results obtained earlier and with the experimental data.

Radiation source for medical X-ray examination, based on the use of electron radiation during channeling in crystals

One of the possible applications of relativistic electron radiation during channeling in crystals, i.e., the use of radiation for medical visualization, is considered.A setup scheme is proposed, the results of numerical simulation of electron dynamics in crystals and radiation generation and the results of calculations of dose loads are presented.

Electron motion simulation in laser-plasma channel for output energy spectrum minimization

Simulations results of electron beam injection to LPWA plasma channel with varying density are presented. Buncher and channel parameters optimization to minimize electron beam energy spectrum and needed laser intensity are discussed.