Energy change of a depolarizing resonance due to a type-3 Siberian snake

Author

Minty, M.G. ; Ellison, T.J.P. ; Goodwin, J.E. ; Lee, S.Y. ; Pancella, P.V. ; Rinckel, T. ; Ross, M.A. ; Sperisen, F. ; Stephenson, E.J. ; von Przewoski, B. ; Baiod, R. ; Derbenev, Ya S. ; Krisch, A.D. ; Phelps, R.A. ; Roser, T. ; van Guilder, B.S. ; Vuari

Author_Institution

Cyclotron Facility, Indiana Univ., Bloomington, IN, USA

fYear

1991

fDate

6-9 May 1991

Firstpage

2506

Abstract

The authors measured the photon beam polarization in the IUCF (Indiana University Cyclotron Facility) Cooler Ring at five energies. They found that the G/sub lambda /=2 imperfection depolarizing resonance occurred about 1.9 MeV below the expected resonance energy of 108.4 MeV. This energy shift could be due to a shift of about +0.0036 in the spin time, nu /sub s/, which is the number of spin rotations in each turn around the ring. It was then demonstrated that this spin tune shift is consistent with the cooler ring containing a partial type-3 Siberian snake, which is apparently caused by the magnets that confine the electron and proton beams in the cooling region.<>

Keywords

beam handling equipment; cyclotrons; proton accelerators; Cooler Ring; IUCF; Indiana University Cyclotron Facility; energy shift; imperfection depolarizing resonance; partial type-3 Siberian snake; photon beam polarization; Acceleration; Cooling; Cyclotrons; Electrons; Magnetic field measurement; Magnetic resonance; Particle beams; Polarization; Protons; Synchrotrons;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE

Conference_Location

San Francisco, CA, USA

Print_ISBN

0-7803-0135-8

Type

conf

DOI

10.1109/PAC.1991.165013

Filename

165013