DEPOLARIZATION OF A POLARIZED PROTON BEAM IN A SYNCHROTRON

Journal Article · Wed Jun 01 04:00:00 EDT 1960 · Nuclear Instr. & Methods

DOI:https://doi.org/10.1016/0029-554X(60)90033-1· OSTI ID:4168829

Froissart, M; Stora, R

S>An initially polarized proton beam, when injected in a synchrocyclotron, may suffer substantial depolarization effects, in view of magnetic field inhomogeneities "seen" by individual particles within the beam. A semiquantitative study is made for the 3 Bev Saclay synchrocyclotron. There, the combined effect of vertical betatron oscillations and passage through the straight sections fringing fields is critical. One finds indeed that a certain resonance condition is fulfilled for two values of the energy within the acceleration cycle, which entails a large depolarization in the present case. On the other hand, perturbations due to magnetic inhomogeneities inside the quadrants and the accelerating cavity as well as effects due to synchrotron oscillations prove to be small. It is felt that the analysis presented here could be extended to other machines and other types of accelerated particles. In particular, it is easy to see whether the resonance condition implies the existence of "dangerous" energy regions or not. (auth)

• Research Organization: Centre d'Etudes Nucleaires, Saclay, France
• NSA Number: NSA-14-021027
• OSTI ID: 4168829
• Journal Information: Nuclear Instr. & Methods, Journal Name: Nuclear Instr. & Methods Vol. Vol: 7
• Country of Publication: Country unknown/Code not available
• Language: French

Related Subjects

BETATRONS
CIRCUITS
CYCLOTRONS
DEPOLARIZATION
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
EQUATIONS
ERRORS
FAILURES
FRANCE
INJECTION
MAGNETIC FIELDS
MICROWAVES
OSCILLATIONS
PHYSICS
POLARIZATION
PROTON BEAMS
RESONANCE
SYNCHROTRONS