Abstract
We present a multimode $X$-band rf pulse compression system suitable for a TeV-scale electron-positron linear collider such as the Next Linear Collider (NLC). The NLC main linac operating frequency is 11.424 GHz. A single NLC rf unit is required to produce 400 ns pulses with 475 MW of peak power. Each rf unit should power approximately 5 m of accelerator structures. The rf unit design consists of two 75 MW klystrons and a dual-moded resonant-delay-line pulse compression system that produces a flat output pulse. The pulse compression system components are all overmoded, and most components are designed to operate with two modes. This approach allows high-power-handling capability while maintaining a compact, inexpensive system. We detail the design of this system and present experimental cold test results. We describe the design and performance of various components. The high-power testing of the system is verified using four 50 MW solenoid-focused klystrons run off a common 400 kV solid-state modulator. The system has produced 400 ns rf pulses of greater than 500 MW. We present the layout of our system, which includes a dual-moded transmission waveguide system and a dual-moded resonant line (SLED-II) pulse compression system. We also present data on the processing and operation of this system, which has set high-power records in coherent and phase controlled pulsed rf.
Highlights
Ultra-high-power rf systems at X-band and above have received a lot of attention at different laboratories around the world because of the desire to design and construct a next-generation linear collider
One has to reinvent most of these components, taking into account the constraints imposed by ultra-high-power operation. These components are usually made of oxygen-free, high-conductivity copper, and operation takes place under ultrahigh vacuum conditions
We present a pulse compression system based on our components
Summary
Ultra-high-power rf systems at X-band and above have received a lot of attention at different laboratories around the world because of the desire to design and construct a next-generation linear collider. For a review of these activities the reader is referred to [1,2] These systems are required to generate and manipulate hundreds of megawatts of pulsed rf power. To reduce losses and to enhance power-handling capabilities, one must use overmoded waveguide. Power is supplied to the pulse compressor by four 50 MW X-band klystrons run off a common 400 kV solid-state induction modulator. With this system, we have produced a peak rf signal of about 580 MW. This fully demonstrates the powerhandling capability of these designs It exceeds the previous state of the art [3] by increasing the pulse energy by more than a factor of 3 and the pulse power by more than 25%. We describe first our experience with rf processing the system and the reliability test, an approximately 300 h continuous run to determine its operational robustness
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