High-intensity single bunch instability behavior in the new SLC damping ring vacuum chamber

Author

Bane, K. ; Bowers, J. ; Chao, A. ; Chen, T. ; Decker, F.J. ; Holtzapple, R.L. ; Krejcik, P. ; Limberg, T. ; Lisin, A. ; McKee, B. ; Minty, M.G. ; Ng, C.K. ; Pietryka, M. ; Podobedov, B. ; Rackelmann, A. ; Rago, C. ; Raubenheimer, T. ; Ross, M.C. ; Siemann

Author_Institution

Linear Accel. Center, Stanford Univ., CA, USA

Volume

5

fYear

1995

fDate

1-5 May 1995

Firstpage

3109

Abstract

New low-impedance vacuum chambers were installed in the SLC damping rings for the 1994 run after finding a single bunch instability with the old chamber. Although the threshold is lower with the new vacuum chamber, the instability is less severe, and we are now routinely operating at intensities of 4.5×10¹⁰ particles per bunch (ppb) compared to 3×10¹⁰ ppb in 1993. The vacuum chamber upgrade is described, and measurements of the bunch length, energy spread, and frequency and time domain signatures of the instability are presented

Keywords

beam handling techniques; colliding beam accelerators; electron accelerators; linear colliders; particle beam stability; storage rings; vacuum apparatus; SLC damping ring vacuum chamber; Stanford Linear Collider; bunch length; energy spread; frequency domain signature; high-intensity single bunch instability; low-impedance vacuum chambers; time domain signature; vacuum chamber upgrade; Bellows; Damping; Impedance; Laser excitation; Length measurement; Machining; Radio frequency; Synchrotron radiation; Thermal conductivity; Welding;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505800

Filename

505800