363 research outputs found
Educating and Training Accelerator Scientists and Technologists for Tomorrow
Accelerator science and technology is inherently an integrative discipline
that combines aspects of physics, computational science, electrical and
mechanical engineering. As few universities offer full academic programs, the
education of accelerator physicists and engineers for the future has primarily
relied on a combination of on-the-job training supplemented with intense
courses at regional accelerator schools. This paper describes the approaches
being used to satisfy the educational interests of a growing number of
interested physicists and engineers.Comment: 19 pages, 3 figure
Concept of a Staged FEL Enabled by Fast Synchrotron Radiation Cooling of Laser-Plasma Accelerated Beam by Solenoidal Magnetic Fields in Plasma Bubble
A novel method for generating GigaGauss solenoidal field in laser-plasma
bubble, using screw-shaped laser pulses, has been recently presented in
arXiv:1604.01259 [physics.plasm-ph]. Such magnetic fields enable fast
synchrotron radiation cooling of the beam emittance of laser-plasma accelerated
leptons. This recent finding opens a novel approach for design of laser-plasma
FELs or colliders, where the acceleration stages are interleaved with
laser-plasma emittance cooling stages. In this concept paper we present an
outline of how a staged plasma-acceleration FEL could look like and discuss
further studies needed to investigate the feasibility of the concept in detail
NLC Luminosity as a Function of Beam Parameters
Realistic calculation of NLC luminosity has been performed using particle
tracking in DIMAD and beam-beam simulations in GUINEA-PIG code for various
values of beam emittance, energy and beta functions at the Interaction Point
(IP). Results of the simulations are compared with analytic luminosity
calculations. The optimum range of IP beta functions for high luminosity was
identified.Comment: 4 pages, 7 figure
Simulation Studies of the NLC with Improved Ground Motion Models
The performance of various systems of the Next Linear Collider (NLC) have
been studied in terms of ground motion using recently developed models. In
particular, the performance of the beam delivery system is discussed. Plans to
evaluate the operation of the main linac beam-based alignment and feedback
systems are also outlined.Comment: Submitted to XX International Linac Conferenc
Asymmetric Dual Axis Energy Recovery Linac for Ultra-High Flux sources of coherent X-ray/THz radiation: Investigations Towards its Ultimate Performance
In order for sources of coherent high brightness and intensity THz and X-Ray
radiation to be accepted by university or industrial R&D laboratories, truly
compact, high current and efficient particle accelerators are required. The
demand for compactness and efficiency can be satisfied by superconducting RF
energy recovery linear accelerators (SRF ERL) allowing effectively minimising
the footprint and maximising the efficiency of the system. However such set-ups
are affected by regenerative beam-break up (BBU) instabilities which limit the
beam current and may terminate the beam transport as well as energy
recuperation. In this paper we suggest and discuss a SRF ERL with asymmetric
configuration of resonantly coupled accelerating and decelerating cavities. In
this type of SRF ERL an electron bunch is passing through accelerating and
decelerating cavities once and, as we show in this case, the regenerative BBU
instability can be minimised allowing high currents to be achieved. We study
the BBU start current in such an asymmetric ERL via analytical and numerical
models and discuss the properties of such a system
Tuning Knobs for the NLC Final Focus
Compensation of optics errors at the Interaction Point (IP) is essential for
maintaining maximum luminosity at the NLC. Several correction systems (knobs)
using the Final Focus sextupoles have been designed to provide orthogonal
compensation of linear and the second order optics aberrations at IP. Tuning
effects of these knobs on the 250 GeV beam were verified using tracking
simulations.Comment: 4 pages, 3 figure
Beam-based Feedback Simulations for the NLC Linac
Extensive beam-based feedback systems are planned as an integral part of the
Next Linear Collider (NLC) control system. Wakefield effects are a significant
influence on the feedback design, imposing both architectural and algorithmic
constraints. Studies are in progress to assure the optimal selection of devices
and to refine and confirm the algorithms for the system design. We show the
results of initial simulations, along with evaluations of system response for
various conditions of ground motion and other operational disturbances.Comment: 3 pages. Linac2000 conferenc
The International Linear Collider beam dumps
The ILC beam dumps are a key part of the accelerator design. At Snowmass
2005, the current status of the beam dump designs were reviewed, and the
options for the overall dump layout considered. This paper describes the
available dump options for the baseline and the alternatives and considers
issues for the dumps that require resolution.Comment: Prepared for 2005 International Linear Collider Physics and Detector
Workshop and 2nd ILC Accelerator Workshop, Snowmass, Colorado, 14-27 Aug 200
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Plasma rotation with circularly polarized laser pulse
The efficient transfer of angular orbital momentum from circularly polarized laser pulses into ions of solid density targets is investigated with different geometries using particle-in-cell simulations. The detailed electron and ion dynamics presented focus upon the energy and momentum conversion efficiency. It is found that the momentum transfer is more efficient for spiral targets and the maximum value is obtained when the spiral step is equal to twice the laser wavelength. This study reveals that the angular momentum distribution of ions strongly depends up on the initial target shape and density
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