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Title: Beam Breakup Effects in Dielectric Based Accelerators

The dynamics of the beam in structure-based wakefield accelerators leads to beam stability issues not ordinarily found in other machines. In particular, the high current drive beam in an efficient wakefield accelerator loses a large fraction of its energy in the decelerator structure, resulting in physical emittance growth, increased energy spread, and the possibility of head-tail instability for an off axis beam, all of which can lead to severe reduction of beam intensity. Beam breakup (BBU) effects resulting from parasitic wakefields provide a potentially serious limitation to the performance of dielectric structure based wakefield accelerators as well. We report on experimental and numerical investigation of BBU and its mitigation. The experimental program focuses on BBU measurements at the AWA facility in a number of high gradient and high transformer ratio wakefield devices. New pickup-based beam diagnostics will provide methods for studying parasitic wakefields that are currently unavailable. The numerical part of this research is based on a particle-Green's function beam breakup code we are developing that allows rapid, efficient simulation of beam breakup effects in advanced linear accelerators. The goal of this work is to be able to compare the results of detailed experimental measurements with the accurate numerical resultsmore » and to design an external FODO channel for the control of the beam in the presence of strong transverse wakefields.« less
Authors:
;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ; ;  [5]
  1. Euclid Techlabs LLC, Solon, OH 44139 (United States)
  2. (United States)
  3. Dynamics Software, Helsinki (Finland)
  4. Electrotechnical University Eltech 'LETI', St. Petersburg (Russian Federation)
  5. Argonne National Laboratory, IL (United States)
Publication Date:
OSTI Identifier:
21255255
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1086; Journal Issue: 1; Conference: 13. advanced accelerator concepts workshop, Santa Cruz, CA (United States), 27 Jul - 2 Aug 2008; Other Information: DOI: 10.1063/1.3080941; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIELECTRIC MATERIALS; GREEN FUNCTION; INSTABILITY; MITIGATION; PERFORMANCE; SIMULATION; SPACE CHARGE; STABILITY; TRANSFORMERS; WAKEFIELD ACCELERATORS