The Next Linear Collider damping ring RF system

Author

Corlett, J.N. ; Li, D. ; Rimmer, R.A. ; Koehler, G. ; Rasson, J. ; Corredoura, P. ; Minty, M. ; Ng, C. ; Raubenheimer, T.O. ; Ross, M.C. ; Schwarz, H. ; Tighe, R.C. ; Franks, M.

Author_Institution

Lawrence Berkeley Lab., CA, USA

Volume

2

fYear

1999

fDate

1999

Firstpage

800

Abstract

We report progress on the design of the RF systems for the Next Linear Collider (NLC) damping rings. The 714 MHz RF system is a critical component of the damping ring complex, and must provide flexible operation with high-power systems generating 1.5 MV in the main damping rings and 2 MV in the positron pre-damping ring. Average beam currents are approximately 750 mA, and bunch trains are rapidly injected and extracted. A cavity design incorporating higher-order-mode (HOM) damping schemes to minimize beam impedance and maximize current thresholds for coupled-bunch instabilities will be presented. Cavity construction techniques are designed to reduce costs while providing a reliable system with excellent performance. Descriptions of feedback systems requirements will be presented, with particular attention to the klystron bandwidth requirement for feedback against transient beam loading. Flexible low-level controls and feedback loops will be described

Keywords

accelerator RF systems; accelerator cavities; accelerator control systems; electron accelerators; feedback; klystrons; linear colliders; particle beam bunching; particle beam extraction; particle beam injection; particle beam stability; storage rings; 1.5 MV; 2 MV; 714 MHz; 750 mA; HOM damping; NLC; Next Linear Collider damping ring RF system; average beam currents; bunch trains; cavity construction techniques; cavity design; coupled-bunch instabilities; extraction; feedback systems; flexible low-level controls; high-power systems; higher-order-mode damping; injection; klystron; positron predamping ring; transient beam loading; Bandwidth; Costs; Damping; Feedback; Impedance; Klystrons; Optical coupling; Positrons; Radio frequency; Structural beams;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.795360

Filename

795360