Abstract
A compact rf pulse compressor, fed by a phase-modulated pulse, is described for producing high-power flattop pulses at Ka-band. The compressor consists of a single axisymmetrical cavity operating in a combination of ${\mathrm{TE}}_{0n}$ modes ($n=1$, 2, 3), that have zero electric fields at the walls. This feature enhances the breakdown strength of the system and makes it possible to increase the output power, as compared with a traditional SLED-II pulse compressor. Advantages include use of one channel instead of two, and no requirement for a 3-dB hybrid coupler. This 34 GHz one-channel pulse compressor (OC SLED-II) is designed to multiply peak power produced by the Yale/Omega-P Ka-band magnicon amplifier (30--40 MW, $0.5--1\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$) by $(3--4)\ensuremath{\mathbin:}1$ and to compress in time by $(5--6)\ensuremath{\mathbin:}1$. The efficiency of the proposed compressor is similar to that of SLED-II. Results of low-power tests carried out on a 30 GHz prototype of the compressor are discussed.
Highlights
Development of high-gradient accelerating structures for a possible future normal-conducting eÿ ÿ e linear collider requires rf sources at frequencies in the range of 10 –34 GHz [1]
Advantages include use of one channel instead of two, and no requirement for a 3-dB hybrid coupler. This 34 GHz one-channel pulse compressor (OC SLED-II) is designed to multiply peak power produced by the Yale/Omega-P Ka-band magnicon amplifier (30 – 40 MW, 0:5–1 s) by 3–4:1 and to compress in time by 5–6
Typical required powers for such tests fall in the range of 100–200 MW with pulse widths of 100 –200 ns. This power level can be achieved by creation of a longer pulse at an rf source and employing an rf pulse compressor that transforms the long pulse into a shorter pulse of higher power
Summary
Development of high-gradient accelerating structures for a possible future normal-conducting eÿ ÿ e linear collider requires rf sources at frequencies in the range of 10 –34 GHz [1]. A multimode SLED-II pulse compressor illustrated schematically in Fig. 1 has recently been developed, originally as a prospective system at X-band for NLC and JLC [2,3] This device remains relevant as a core element in a test facility to produce the high peak powers required for high-gradient R&D. This SLED-II compressor consists of two identical resonant delay lines which are fed by an input rf pulse by means of the coupling holes.
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