Abstract
Pulse compression systems for future linear colliders, such as NLC and JLC, involve hundreds of kilometers of waveguide runs. These waveguides are highly overmoded to reduce the rf losses. In this paper we present a novel idea for utilizing these waveguides several times by using different modes. This idea is suitable for reflective delay lines. All the modes being used have low-loss characteristics. We describe mechanically simple mode transducers that switch the propagation mode from one configuration to another with no observable dispersion. We apply this technique to a resonant delay line pulse compression system. We also present experimental results that verify these theoretical developments.
Highlights
The rf pulse compression systems for future X-band linear colliders [1] contain very long runs of overmoded waveguides
The transmission lines transmit the rf power in several modes utilizing the transmission line several times
We suggest a variation which is suitable for reflective delay lines. These are used in systems such as the resonant delay line pulse compression system, known as SLED-II [3,4]
Summary
The rf pulse compression systems for future X-band linear colliders [1] contain very long runs of overmoded waveguides. To reduce the lengths of these runs, multimoded rf structures and transmission lines have been suggested [2]. In these multimoded systems, the transmission lines transmit the rf power in several modes utilizing the transmission line several times. We suggest a variation which is suitable for reflective delay lines. These are used in systems such as the resonant delay line pulse compression system, known as SLED-II [3,4]. We present component designs for an X-band system with a compression ratio of 4 and an output pulse width of 400 ns and present experimental results for such a system
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