Effects of magnetic non-linearities on a stored proton beam and their implications for superconducting storage rings
Abstract
A nonlinear lens may be used to study the effect of high-order multipolar field imperfections on a stored proton beam. Such a nonlinear lens is particulary suitable to simulate field imperfections of the types encountered in coil dominated superconducting magnets. We have studied experimentally at the SPS the effect of high order (5th and 8th) single isolated resonances driven by the nonlinear lens. The width of these resonances is of the order one expects to be caused by field errors in superconducting magnets of the SSC type. The experiment shows that, in absence of tune modulation, these resonances are harmless. Slow crossings of the resonance, on the other hand, have destructive effects on the beam, much more so than fast crossings caused by synchrotron oscillations. In the design of future storage rings, sources of low-frequency tune modulation should be avoided as a way to reduce the harmful effects of high order multipolar field imperfection.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Berkeley Lab., CA (USA)
- OSTI Identifier:
- 6385665
- Report Number(s):
- LBL-19808; CONF-8503105-10
ON: DE86002867
- DOE Contract Number:
- AC03-76SF00098
- Resource Type:
- Conference
- Resource Relation:
- Conference: Orbital dynamics and applications to accelerators workshop, Berkeley, CA, USA, 7 Mar 1985; Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; BEAM DYNAMICS; NONLINEAR PROBLEMS; PROTON BEAMS; STORAGE RINGS; ELECTROMAGNETIC LENSES; SUPERCONDUCTING MAGNETS; BEAMS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; EQUIPMENT; LENSES; MAGNETS; NUCLEON BEAMS; PARTICLE BEAMS; SUPERCONDUCTING DEVICES; 430400* - Particle Accelerators- Storage Rings; 430200 - Particle Accelerators- Beam Dynamics, Field Calculations, & Ion Optics
Citation Formats
Cornacchia, M, and Evans, L. Effects of magnetic non-linearities on a stored proton beam and their implications for superconducting storage rings. United States: N. p., 1985.
Web.
Cornacchia, M, & Evans, L. Effects of magnetic non-linearities on a stored proton beam and their implications for superconducting storage rings. United States.
Cornacchia, M, and Evans, L. 1985.
"Effects of magnetic non-linearities on a stored proton beam and their implications for superconducting storage rings". United States. https://www.osti.gov/servlets/purl/6385665.
@article{osti_6385665,
title = {Effects of magnetic non-linearities on a stored proton beam and their implications for superconducting storage rings},
author = {Cornacchia, M and Evans, L},
abstractNote = {A nonlinear lens may be used to study the effect of high-order multipolar field imperfections on a stored proton beam. Such a nonlinear lens is particulary suitable to simulate field imperfections of the types encountered in coil dominated superconducting magnets. We have studied experimentally at the SPS the effect of high order (5th and 8th) single isolated resonances driven by the nonlinear lens. The width of these resonances is of the order one expects to be caused by field errors in superconducting magnets of the SSC type. The experiment shows that, in absence of tune modulation, these resonances are harmless. Slow crossings of the resonance, on the other hand, have destructive effects on the beam, much more so than fast crossings caused by synchrotron oscillations. In the design of future storage rings, sources of low-frequency tune modulation should be avoided as a way to reduce the harmful effects of high order multipolar field imperfection.},
doi = {},
url = {https://www.osti.gov/biblio/6385665},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1985},
month = {Sat Jun 01 00:00:00 EDT 1985}
}