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Title: Beam Coupling to Optical Scale Accelerating Structures

Abstract

Current research efforts into structure based laser acceleration of electrons utilize beams from standard RF linacs. These beams must be coupled into very small structures with transverse dimensions comparable to the laser wavelength. To obtain decent transmission, a permanent magnet quadrupole (PMQ) triplet with a focusing gradient of 560 T/m is used to focus into the structure. Also of interest is the induced wakefield from the structure, useful for diagnosing potential accelerator structures or as novel radiation sources.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
901584
Report Number(s):
SLAC-PUB-12422
TRN: US0702598
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Journal Name: AIP Conf.Proc.877:665-671,2006; Conference: Prepared for 12th Advanced Accelerator Concepts Workshop (AAC 2006), Lake Geneva, Wisconsin, 10-15 Jul 2006
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; ACCELERATORS; DIMENSIONS; ELECTRONS; FOCUSING; LASERS; LINEAR ACCELERATORS; PERMANENT MAGNETS; QUADRUPOLES; RADIATION SOURCES; TRIPLETS; Accelerators,ACCPHY

Citation Formats

Sears, C.M., Byer, R.L., Colby, E.R., Cowan, B.M., Ischebeck, R., Lincoln, M.R., Siemann, R.H., Spencer, J.E., /SLAC, Plettner, T., and /Stanford U., Phys. Dept. Beam Coupling to Optical Scale Accelerating Structures. United States: N. p., 2007. Web.
Sears, C.M., Byer, R.L., Colby, E.R., Cowan, B.M., Ischebeck, R., Lincoln, M.R., Siemann, R.H., Spencer, J.E., /SLAC, Plettner, T., & /Stanford U., Phys. Dept. Beam Coupling to Optical Scale Accelerating Structures. United States.
Sears, C.M., Byer, R.L., Colby, E.R., Cowan, B.M., Ischebeck, R., Lincoln, M.R., Siemann, R.H., Spencer, J.E., /SLAC, Plettner, T., and /Stanford U., Phys. Dept. Tue . "Beam Coupling to Optical Scale Accelerating Structures". United States. doi:. https://www.osti.gov/servlets/purl/901584.
@article{osti_901584,
title = {Beam Coupling to Optical Scale Accelerating Structures},
author = {Sears, C.M. and Byer, R.L. and Colby, E.R. and Cowan, B.M. and Ischebeck, R. and Lincoln, M.R. and Siemann, R.H. and Spencer, J.E. and /SLAC and Plettner, T. and /Stanford U., Phys. Dept.},
abstractNote = {Current research efforts into structure based laser acceleration of electrons utilize beams from standard RF linacs. These beams must be coupled into very small structures with transverse dimensions comparable to the laser wavelength. To obtain decent transmission, a permanent magnet quadrupole (PMQ) triplet with a focusing gradient of 560 T/m is used to focus into the structure. Also of interest is the induced wakefield from the structure, useful for diagnosing potential accelerator structures or as novel radiation sources.},
doi = {},
journal = {AIP Conf.Proc.877:665-671,2006},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 27 00:00:00 EDT 2007},
month = {Tue Mar 27 00:00:00 EDT 2007}
}

Conference:
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  • Current research efforts into structure based laser acceleration of electrons utilize beams from standard RF linacs. These beams must be coupled into very small structures with transverse dimensions comparable to the laser wavelength. To obtain decent transmission, a permanent magnet quadrupole (PMQ) triplet with a focusing gradient of 560 T/m is used to focus into the structure. Also of interest is the induced wakefield from the structure, useful for diagnosing potential accelerator structures or as novel radiation sources.
  • Investigations of the RF properties of certain twisted waveguide structures show that they support favorable accelerating fields. This makes them potential candidates for accelerating cavities. Using the particle tracking code, ORBIT, We examine the beam - RF interaction in the twisted cavity structures to understand their beam transport and acceleration properties. The results will show the distinctive properties of these new structures for particle transport and acceleration, which have not been previously analyzed.
  • Beam emittance dilution by self induced transverse fields (wakefields) in accelerating structures is a key problem in linear accelerators. To minimize the wakefield effects the beam trajectory must be precisely centered within the structures. An efficient way to achieve this is to detect beam induced microwave signals in the lowest dipole mode band and to steer the beam by minimizing these signals. This paper briefly covers some experiences from SLC S-band structures, but mainly concentrates on results of a wakefield instrumentation scheme applied to a NLC prototype X-band structure and tested with beam in the SLC linac. A beam basedmore » in-situ structure straightness measurement is shown as well as results of beam steering experiments based on phase and amplitude detection of two separated modes in the structure. After centering the beam the reduction of the wakefield was demonstrated independently by probing it with a test bunch that is deflected by the residual wakefield at a short distance behind the drive bunch.« less