The Next Linear Collider Damping Ring complex

Author

Corlett, J. ; Atkinson, D. ; De Santis, S. ; Hartman, N. ; Kennedy, K. ; Li, D. ; Marks, S. ; Minamihara, Y. ; Nishimura, H. ; Pivi, M. ; Reavill, D. ; Rimmer, R. ; Schlueter, R. ; Wolski, A. ; Anderson, S. ; McKee, B. ; Raubenheimer, T. ; Ross, M. ; Shep

Author_Institution

Lawrence Berkeley Lab., Berkeley, CA, USA

Volume

5

fYear

2001

fDate

2001

Firstpage

3585

Abstract

We report progress on the design of the Next Linear Collider (NLC) Damping Rings complexes. The purpose of the damping rings is to provide low emittance electron and positron bunch trains to the NLC linacs, at a rate of 120 Hz. As an option to operate at the higher rate of 180 Hz, two 1.98 GeV main damping rings per beam are proposed, and one positron pre-damping ring. The main damping rings store up to 0.8 amp in 3 trains of 190 bunches each and have normalized extracted beam emittances γε_x = 3 mm-mrad and γε_y = 0.02 mm-mrad. The optical designs, based on a theoretical minimum emittance lattice (TME), are described, with an analysis of dynamic aperture and nonlinear effects. Key subsystems and components are described, including the wiggler, the vacuum systems and photon stop design, and the higher-order-mode damped RF cavities. Impedance and instabilities are discussed

Keywords

accelerator RF systems; electron accelerators; linear colliders; storage rings; vacuum apparatus; wigglers; Damping Ring; NLC; Next Linear Collider; beam emittances; dynamic aperture; higher-order-mode damped RF cavities; impedance; instabilities; minimum emittance lattice; photon stop; vacuum systems; wiggler; Apertures; Damping; Electron beams; Electron emission; Lattices; Linear accelerators; Optical design; Positrons; Undulators; Vacuum systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.988186

Filename

988186