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Title: Longitudinal stability in multiharmonic standing wave linacs

Accelerating cavities that excite multiple modes at integer harmonics of the fundamental frequency have the potential to be used to suppress the onset of rf breakdown and reduce the pulsed surface heating at high accelerating gradients. Understanding the effect of an additional harmonic cavity mode on the longitudinal beam dynamics is important to their development and use. A Hamiltonian that describes the longitudinal motion of a particle as it traverses a chain of multiharmonic cavities has been derived and is applied to the case of a second harmonic cavity. The Hamiltonian is based upon formalisms found in literature for the fundamental harmonic and is extended to include different longitudinal field distributions and harmonic frequencies. The study initially explores the longitudinal motion for moderate accelerating gradients with high-β protons, as this will allow fundamental properties of the stable region (acceptance and shape of the rf bucket) to be determined. High accelerating gradients are also investigated but the focus will be on phase stability throughout. Finally, this work concludes by considering the longitudinal dynamics of a modified European Spallation Source accelerator, comprised of multiharmonic cavities that has specifications broadly consistent with the accelerator.
Authors:
 [1] ;  [1] ;  [2] ;  [2]
  1. Univ. of Manchester (United Kingdom). School of Physics and Astronomy; Cockcroft Inst. of Science and Technology, Daresbury (United Kingdom)
  2. Omega-P, Inc., New Haven, CT (United States); Yale Univ., New Haven, CT (United States). Physics Dept.
Publication Date:
Grant/Contract Number:
SC0010699
Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 19; Journal Issue: 9; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Research Org:
Yale Univ., New Haven, CT (United States); Univ. of Manchester (United Kingdom); Yale University
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Science and Technology Facilities Council (STFC) (United Kingdom)
Contributing Orgs:
Omega-P, Inc., New Haven, CT (United States); Cockcroft Inst. of Science and Technology, Daresbury (United Kingdom)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1326120
Alternate Identifier(s):
OSTI ID: 1360092; OSTI ID: 1360093