Section Navigation

Browse



logged in as: pbpl
logout
list users

AAC 2004 11th

Name: AAC 2004 11th

Location:

Date: 2004-01-01

Comments:

Created at:

Updated at:

Edit | Back | Add Paper

5 papers from the conference:

title: An Ultra-High Gradient Cerenkov Wakefield Acceleration Experiment at SLAC FFTB
format: conference proceeding
conference: AAC 2004 11th
year: 2004
7 authors: J.B. Rosenzweig | S. Hoover | M. Hogan | P. Muggli | M.C. Thompson | G. Travish | R. Yoder
abstract: The creation of ultra-high current, ultra-short pulse beams (Q=3 nC, ?z= 20 ?m) at the SLAC FFTB has opened the way for very high gradient plasma wakefield acceleration experiments. We study here the use of these beams in a proposed Cerenkov wakefield experiment, where one may excite electromagnetic wakes in a simple dielectric tube with inner diameter of few 100 microns that exceed the GV/m level. We discuss the scaling of the fields with design geometric design parameters, and choice of dielectric. We also examine measurable aspects of the experiment, such as the total coherent Cerenkov radiation energy one may collect, and the expected aspects of dielectric breakdown at high fields.
keywords:
Download | Details | Edit | Delete
title: An Optimal Design for a THz Dielectric-Loaded Slab-Symmetric Accelerator
format: conference proceeding
conference: AAC 2004 11th
year: 2004
2 authors: R.B. Yoder | J.B. Rosenzweig
abstract: A slab-symmetric dielectric-loaded accelerator structure, consisting of a vacuum gap between dielectric-lined conducting walls, is analyzed theoretically and computationally. The device is to be resonantly excited by an external laser source of wavelength 340
keywords:
Download | Details | Edit | Delete
title: A Helical Undulator Wave-guide Inverse Free-Electron Laser
format: conference proceeding
conference: AAC 2004 11th
year: 2004
8 authors: J.B. Rosenzweig | N. Bodzin | P. Frigola | C. Joshi | P. Musumeci | C. Pellegrini | S. Tochitsky | G. Travish
abstract: With recent success in high gradient, high-energy gain IFEL experiments at the UCLA Neptune Laboratory, future experiments are now being contemplated. The Neptune IFEL was designed to use a tightly focused, highly diffracting, near-TW peak power 10 micron laser. This choice of laser focusing, driven by power-handling limitations of the optics near the interaction region, led to design and use of a very complex undulator, and to sensitivity to both laser misalignment and focusing errors. As these effects limited the performance of the IFEL experiment, a next generation experiment at Neptune has been studied which avoids the use of a highly diffractive laser beam through use of a waveguide. We discuss here the choice of low-loss waveguide, guided mode characteristics and likely power limitations. We also examine a preferred undulator design, which is chosen to be helical in order to maximize the acceleration achieved for a given power. With the limitations of these laser and undulator choices in mind, we show the expected performance of the IFEL using 1D simulations. Three-dimensional effects are examined, in the context of use of a solenoid for focusing and acceleration enhancement.
keywords:
Download | Details | Edit | Delete
title: An Ultra-High Gradient Cerenkov Wakefield Acceleration Experiment at SLAC FFTB
format: conference proceeding
conference: AAC 2004 11th
year: 2004
7 authors: J.B. Rosenzweig | S. Hoover | M. Hogan | P. Muggli | M.C. Thompson | G. Travish | R. B. Yoder
abstract: The creation of ultra-high current, ultra-short pulse beams (Q=3 nC, ) at the SLAC FFTB has opened the way for very high gradient plasma wakefield acceleration experiments. We study here the use of these beams in a proposed Cerenkov wakefield experiment, where one may excite electromagnetic wakes in a simple dielectric tube with inner diameter of few100 microns that exceed the GV/m level. We discuss the scaling of the fields with design geometric design parameters, and choice of dielectric. We also examine measurable aspects of the experiment, such as the total coherent Cerenkov radiation energy one may collect, and the expected aspects of dielectric breakdown at high fields.
keywords:
Download | Details | Edit | Delete
title: A PMQ-based, Ultra-short Focal Length, Final Focus System for Next Generation Beam-Radiation and Beam-Plasma Experiments
format: talk
year: 2004
1 author: G. Travish
abstract: Next-generation advanced-accelerators such as the PWFA, and beam-radiation interactions such as inverse-Compton scattering, depend on increased beam-density to achieve superior results. The photoinjector has enabled the production of high-brightness beams that are desirable for experiments with critical dependencies on bunch length and emittance. Along with the production of shorter and lower-emittance beams, comes the need to produce shorter focal-lengths (beta-functions). An approach to creating strong focusing-channels using high field, small-bore permanent-magnet quadrupoles (PMQs) has been followed by the authors. A focusing system using three PMQs, each composed of 16 Nd-Fe-B sectors in a Halbach geometry has been installed in the PLEIADES inverse-Compton experiment. As the magnets are of a fixed field-strength, the focusing system is tuned by adjusting the position of the three magnets along the beamline axis. This presentation covers the details of the focusing system, experimental experience, and implications for future experiments with an emphasis on advanced accelerators.
keywords:
Download | Details | Edit | Delete