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Secondary Electron Yield Measurements and Groove Chambers Tests in the PEP-II Beam Line Straights Sections

Description: Beam instability caused by the electron cloud has been observed in positron and proton storage rings and it is expected to be a limiting factor in the performance of the positron Damping Ring (DR) of future Linear Colliders such as ILC and CLIC [1, 2]. In the Positron Low Energy Ring (LER) of the PEP-II accelerator, we have installed vacuum chambers with rectangular grooves in a straight magnetic-free section to test this promising possible electron cloud mitigation technique. We have also inst… more
Date: July 3, 2008
Creator: Pivi, M. T. F.; King, F.; Kirby, R. E.; Markiewicz, T; Raubenheimer, T. O.; Seeman, J. et al.
Partner: UNT Libraries Government Documents Department
open access

A New Chicane Experiment In PEP-II to Test Mitigations of the Electron Cloud Effect for Linear Colliders

Description: Beam instability caused by the electron cloud has been observed in positron and proton storage rings, and it is expected to be a limiting factor in the performance of future colliders [1-3]. The effect is expected to be particularly severe in magnetic field regions. To test possible mitigation methods in magnetic fields, we have installed a new 4-dipole chicane experiment in the PEP-II Low Energy Ring (LER) at SLAC with both bare and TiN-coated aluminum chambers. In particular, we have observed… more
Date: July 3, 2008
Creator: Pivi, M. T. F.; Ng, J. S. T.; Arnett, D.; Cooper, F.; Kharakh, D.; King, F. K. et al.
Partner: UNT Libraries Government Documents Department
open access

Energy Measurement in a Plasma Wakefield Accelerator

Description: In the E-167 plasma wakefield acceleration experiment, electrons with an initial energy of 42GeV are accelerated in a meter-scale lithium plasma. Particles are leaving plasma with a large energy spread. To determine the spectrum of the accelerated particles, a two-plane spectrometer has been set up.
Date: July 6, 2007
Creator: Ischebeck, R
Partner: UNT Libraries Government Documents Department
open access

3-D Simulations of Plasma Wakefield Acceleration with Non-Idealized Plasmas and Beams

Description: 3-D Particle-in-cell OSIRIS simulations of the current E-162 Plasma Wakefield Accelerator Experiment are presented in which a number of non-ideal conditions are modeled simultaneously. These include tilts on the beam in both planes, asymmetric beam emittance, beam energy spread and plasma inhomogeneities both longitudinally and transverse to the beam axis. The relative importance of the non-ideal conditions is discussed and a worst case estimate of the effect of these on energy gain is obtained… more
Date: September 27, 2005
Creator: Deng, S.; Katsouleas, T.; Lee, S.; Muggli, P.; Mori, W. B.; Hemker, R. et al.
Partner: UNT Libraries Government Documents Department
open access

Modeling of Ionization Physics with the PIC Code OSIRIS

Description: When considering intense particle or laser beams propagating in dense plasma or gas, ionization plays an important role. Impact ionization and tunnel ionization may create new plasma electrons, altering the physics of wakefield accelerators, causing blue shifts in laser spectra, creating and modifying instabilities, etc. Here we describe the addition of an impact ionization package into the 3-D, object-oriented, fully parallel PIC code OSIRIS. We apply the simulation tool to simulate the parame… more
Date: September 27, 2005
Creator: Deng, S.; Tsung, F.; Lee, S.; Lu, W.; Mori, W. B.; Katsouleas, T. et al.
Partner: UNT Libraries Government Documents Department
open access

Simulations of Jitter Coupling due to Wakefields in the FACET Linac

Description: Facilities for Accelerator Science and Experimental Test Beams (FACET) is a proposed facility at SLAC that would use the initial two-thirds of the linac to transport e{sup +} and e{sup -} beams to an experimental region. A principal use of this facility is to identify the optimum method for accelerating positrons in a beam driven plasma wakefield accelerator. To study this, a positron bunch, followed an RF-cycle later by an electron bunch, will be accelerated to an asymmetric chicane designed t… more
Date: October 30, 2009
Creator: Molloy, Stephen
Partner: UNT Libraries Government Documents Department
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