Developments in the NLC modulator R&D program at SLAC

The NLC (Next Linear Collider) development effort continues to move forward from its initial Zero Design Report (ZDR). A major component of the NLC is the high power RF source, which is designed around the technology of the klystron. The NLC is conceptualized around 75 MW, PPM (periodic permanent magnet) focused klystrons and will use approximately 3300 klystrons in each of the two main linacs. Simple analysis has shown that operating two klystrons per modulator has both economic and configuration advantages. The physical design of the modulators is an integral part of the design of the tunnels, etc. Klystron spacing is dictated by the pulse compression regime. This paper presents the to-date results of the investigation efforts in energy storage, pulse transformers and efficiency. Future plans, including new technologies to pursue are discussed. SLAC is also continuously looking for new and novel approaches to either the modulator components or the overall modulator approach. SLAC and the DOE are attempting to use the SBIR program to help with industry development of the needed components and new ideas