Y. H. CHIN, H. MIZUNO, T. OHKAWA, S. YAMAGUCHI (KEK), S. KAZAKOV (BINP)
In this paper, we summarize our activity of 2x2 DLDS system and RF component development for JLC (Japanese Linear Collider). The 2x2 DLDS was proposed to deliver RF power to four RF clusters. It consists of almost identical dual mode DLDS systems with long and short waveguide. The sub-pulses in the distribution waveguide are carried by two different waveguide modes so that they can be extracted at designated locations according to their mode patterns. Only two modes (TE01 and TE12 or TE11) are used in each waveguide to minimize the complication caused by handling of multi-modes in one waveguide, while still providing some of the benefit of multi-mode operation by considerably reducing the total length of waveguide. To demonstrate the fundamental principle of the 2x2 DLDS, a cold model of the dual mode DLDS basic unit was manufactured and tested at KEK. The testing results proved that it was plausible to deliver power at different places using different modes with good efficiency (better than 95%). New RF components such as boomerang superhybrid, bend hybrid, TE01/TE02 modes launcher, extractor, and tap-off system were designed and they are described in detail.
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