Title :
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
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;
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
DOI :
10.1109/PAC.1991.165013
