Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.795360
