Overcoming weak intrinsic depolarizing resonances with energy-jump

Author

Huang, H. ; Ahrens, L. ; Alessi, J.G. ; Bai, M. ; Brown, K.A. ; Bunce, G. ; Cameron, P. ; Ingrassia, P. ; Kponou, A.E. ; Krueger, K. ; Lee, S.Y. ; Luccio, A.U. ; Makdisi, Y.I. ; Mariam, F. ; Okamura, M. ; Ratner, L. ; Reece, K. ; Roser, T. ; Sato, H. ; Sp

Author_Institution

Brookhaven Nat. Lab., Upton, NY, USA

Volume

2

fYear

1997

fDate

12-16 May 1997

Firstpage

1460

Abstract

In the recent polarized proton runs in the AGS, a 5% partial snake was used successfully to overcome the imperfection depolarizing resonances. A polarized proton beam was accelerated up to the required RHIC injection energy of 25 GeV. However, a significant amount of polarization was lost at 0+ν_y, 12+ν_y and 36+ν_y, which is believed to be partially due to the coupling resonances. To overcome the coupling resonance, an energy-jump was generated by rapidly changing the beam circumference using the powerful AGS RF system. It clearly demonstrates that the novel energy-jump method can successfully overcome coupling resonances and weak intrinsic resonances

Keywords

particle beam dynamics; proton accelerators; proton beams; resonance; storage rings; AGS; coupling resonance; energy-jump; imperfection depolarizing resonances; partial snake; polarized proton beam; weak intrinsic depolarizing resonances; weak intrinsic resonances; Acceleration; Frequency; Laboratories; Magnetic resonance; Optical coupling; Particle beams; Physics; Polarization; Protons; Synchrotrons;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.750726

Filename

750726