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Title: High Transformer ratios in collinear wakefield accelerators.

Abstract

Based on our previous experiment that successfully demonstrated wakefield transformer ratio enhancement in a 13.625 GHz dielectric-loaded collinear wakefield accelerator using the ramped bunch train technique, we present here a redesigned experimental scheme for even higher enhancement of the efficiency of this accelerator. Design of a collinear wakefield device with a transformer ratio R2, is presented. Using a ramped bunch train (RBT) rather than a single drive bunch, the enhanced transformer ratio (ETR) technique is able to increase the transformer ratio R above the ordinary limit of 2. To match the wavelength of the fundamental mode of the wakefield with the bunch length (sigmaz=2 mm) of the new Argonne wakefield accelerator (AWA) drive gun (where the experiment will be performed), a 26.625 GHz dielectric based accelerating structure is required. This transformer ratio enhancement technique based on our dielectric-loaded waveguide design will result in a compact, high efficiency accelerating structures for future wakefield accelerators.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
972613
Report Number(s):
ANL-HEP-CP-07-85
TRN: US1001658
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: Particle Accelerator Conference (PAC07); Jun. 25, 2007 - Jun. 29, 2007; Albuquerque, NM
Country of Publication:
United States
Language:
ENGLISH
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; ACCELERATORS; DESIGN; DIELECTRIC MATERIALS; EFFICIENCY; TRANSFORMERS; WAKEFIELD ACCELERATORS; WAVEGUIDES; WAVELENGTHS

Citation Formats

Power, J. G., Conde, M., Yusof, Z., Gai, W., Jing, C., Kanreykin, A., Schoessow, P., High Energy Physics, and Euclid Techlabs, LLC. High Transformer ratios in collinear wakefield accelerators.. United States: N. p., 2008. Web. doi:10.1109/PAC.2007.4440699.
Power, J. G., Conde, M., Yusof, Z., Gai, W., Jing, C., Kanreykin, A., Schoessow, P., High Energy Physics, & Euclid Techlabs, LLC. High Transformer ratios in collinear wakefield accelerators.. United States. doi:10.1109/PAC.2007.4440699.
Power, J. G., Conde, M., Yusof, Z., Gai, W., Jing, C., Kanreykin, A., Schoessow, P., High Energy Physics, and Euclid Techlabs, LLC. 2008. "High Transformer ratios in collinear wakefield accelerators.". United States. doi:10.1109/PAC.2007.4440699.
@article{osti_972613,
title = {High Transformer ratios in collinear wakefield accelerators.},
author = {Power, J. G. and Conde, M. and Yusof, Z. and Gai, W. and Jing, C. and Kanreykin, A. and Schoessow, P. and High Energy Physics and Euclid Techlabs, LLC},
abstractNote = {Based on our previous experiment that successfully demonstrated wakefield transformer ratio enhancement in a 13.625 GHz dielectric-loaded collinear wakefield accelerator using the ramped bunch train technique, we present here a redesigned experimental scheme for even higher enhancement of the efficiency of this accelerator. Design of a collinear wakefield device with a transformer ratio R2, is presented. Using a ramped bunch train (RBT) rather than a single drive bunch, the enhanced transformer ratio (ETR) technique is able to increase the transformer ratio R above the ordinary limit of 2. To match the wavelength of the fundamental mode of the wakefield with the bunch length (sigmaz=2 mm) of the new Argonne wakefield accelerator (AWA) drive gun (where the experiment will be performed), a 26.625 GHz dielectric based accelerating structure is required. This transformer ratio enhancement technique based on our dielectric-loaded waveguide design will result in a compact, high efficiency accelerating structures for future wakefield accelerators.},
doi = {10.1109/PAC.2007.4440699},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2008,
month = 1
}

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  • No abstract prepared.
  • We present a practical method for achieving a transformer ratio (R) greater than 2 with any collinear wakefield accelerator--i.e. with either plasma or structure based wakefield accelerators. It is known that the transformer ratio cannot generally be greater than 2 for a symmetric drive bunch in a collinear wakefield accelerator. However, using a ramped bunch train (RBT) where a train of n electron drive bunches, with increasing (ramping) charge, one can achieve R = 2n after the bunch train. We believe this method is feasible from an engineering standpoint. We describe a proof of principle experiment using an disk-loaded waveguide,more » of frequency 13.65 GHz, driven by a RBT of 4 electron bunches. We expect to achieve R > 6 using 4 electron bunches. Details of the simulation and experimental design are presented.« less
  • The transformer ratio R is a parameter that characterizes the efficiency of the energy transferred from the drive beam to the trailing witness beam passing through a wakefield accelerating structure (all metal or dielectric based) or a plasma chamber. Using a ramped bunch train (RBT) rather than a single drive bunch, the enhanced transformer ratio (ETR) technique is able to increase the transformer ratio R above the ordinary limit of 2 for a single bunch in a collinear wakefield accelerator. The RBT is a train of electron bunches separated by half integer multiples wavelength of the wakefield. The charge ofmore » the leading bunch is lowest and subsequent bunch charges are increased in such a way as to maximize R. In this article, an experimental study of this scheme is presented in which an RBT of 2 bunches with charge ratio of 1:2.5 and bunch length {sigma}{sub z} = 2 mm were used to enhance the transformer ratio. Measurement results and data analysis show good agreement with theoretical predictions. The ETR technique demonstrated here can be used in any collinear wakefield accelerator configuration, either structure- or plasma-based.« less