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Title: Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA

Abstract

In a fixed-field alternating-gradient (FFAG) accelerator, eliminating pulsed magnet operation permits rapid acceleration to synchrotron energies, but with a much higher beam-pulse repetition rate. Conceived in the 1950s, FFAGs are enjoying renewed interest, fuelled by the need to rapidly accelerate unstable muons for future high-energy physics colliders. Until now a 'scaling' principle has been applied to avoid beam blow-up and loss. Removing this restriction produces a new breed of FFAG, a non-scaling variant, allowing powerful advances in machine characteristics. We report on the first non-scaling FFAG, in which orbits are compacted to within 10?mm in radius over an electron momentum range of 12-18 MeV/c. In this strictly linear-gradient FFAG, unstable beam regions are crossed, but acceleration via a novel serpentine channel is so rapid that no significant beam disruption is observed. This result has significant implications for future particle accelerators, particularly muon and high-intensity proton accelerators.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1046789
Report Number(s):
FERMILAB-PUB-12-308-AD
Journal ID: ISSN 1745-2473; TRN: US1203794
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 8; Journal Issue: 3; Journal ID: ISSN 1745-2473
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; ACCELERATORS; ELECTRONS; MAGNETS; MUONS; PHYSICS; PROTONS; SERPENTINE; SYNCHROTRONS; Accelerators

Citation Formats

Machida, S, Barlow, R, Berg, J S, Bliss, N, Buckley, R K, Clarke, J A, Craddock, M K, D'Arcy, R, Edgecock, R, Garland, J M, Giboudot, Y, and /Rutherford /Huddersfield U. /Brookhaven /Daresbury /Cockcroft Inst. Accel. Sci. Tech. /TRIUMF /British Columbia U., Vancouver, Dept. Phys. Astron. /University Coll. London /Manchester U. /Brunel U. /ASP, Melbourne. Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA. United States: N. p., 2012. Web. doi:10.1038/nphys2179.
Machida, S, Barlow, R, Berg, J S, Bliss, N, Buckley, R K, Clarke, J A, Craddock, M K, D'Arcy, R, Edgecock, R, Garland, J M, Giboudot, Y, & /Rutherford /Huddersfield U. /Brookhaven /Daresbury /Cockcroft Inst. Accel. Sci. Tech. /TRIUMF /British Columbia U., Vancouver, Dept. Phys. Astron. /University Coll. London /Manchester U. /Brunel U. /ASP, Melbourne. Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA. United States. https://doi.org/10.1038/nphys2179
Machida, S, Barlow, R, Berg, J S, Bliss, N, Buckley, R K, Clarke, J A, Craddock, M K, D'Arcy, R, Edgecock, R, Garland, J M, Giboudot, Y, and /Rutherford /Huddersfield U. /Brookhaven /Daresbury /Cockcroft Inst. Accel. Sci. Tech. /TRIUMF /British Columbia U., Vancouver, Dept. Phys. Astron. /University Coll. London /Manchester U. /Brunel U. /ASP, Melbourne. Thu . "Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA". United States. https://doi.org/10.1038/nphys2179.
@article{osti_1046789,
title = {Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA},
author = {Machida, S and Barlow, R and Berg, J S and Bliss, N and Buckley, R K and Clarke, J A and Craddock, M K and D'Arcy, R and Edgecock, R and Garland, J M and Giboudot, Y and /Rutherford /Huddersfield U. /Brookhaven /Daresbury /Cockcroft Inst. Accel. Sci. Tech. /TRIUMF /British Columbia U., Vancouver, Dept. Phys. Astron. /University Coll. London /Manchester U. /Brunel U. /ASP, Melbourne},
abstractNote = {In a fixed-field alternating-gradient (FFAG) accelerator, eliminating pulsed magnet operation permits rapid acceleration to synchrotron energies, but with a much higher beam-pulse repetition rate. Conceived in the 1950s, FFAGs are enjoying renewed interest, fuelled by the need to rapidly accelerate unstable muons for future high-energy physics colliders. Until now a 'scaling' principle has been applied to avoid beam blow-up and loss. Removing this restriction produces a new breed of FFAG, a non-scaling variant, allowing powerful advances in machine characteristics. We report on the first non-scaling FFAG, in which orbits are compacted to within 10?mm in radius over an electron momentum range of 12-18 MeV/c. In this strictly linear-gradient FFAG, unstable beam regions are crossed, but acceleration via a novel serpentine channel is so rapid that no significant beam disruption is observed. This result has significant implications for future particle accelerators, particularly muon and high-intensity proton accelerators.},
doi = {10.1038/nphys2179},
url = {https://www.osti.gov/biblio/1046789}, journal = {Nature Physics},
issn = {1745-2473},
number = 3,
volume = 8,
place = {United States},
year = {2012},
month = {3}
}