Abstract
Future (nonsuperconducting) linear colliders will require very high values of peak rf power per meter of accelerating structure. The role of rf pulse compression in producing this power is examined within the context of overall rf system design for three future colliders at energies of 1.0–1.5 TeV, 5 TeV, and 25 TeV. In order to keep the average AC input power and the length of the accelerator within reasonable limits, a collider in the 1.0–1.5 TeV energy range will probably be built at an x‐band rf frequency, and will require a peak power on the order of 150–200 MW per meter of accelerating structure. A 5 TeV collider at 34 GHz with a reasonable length (35 km) and AC input power (225 MW) would require about 550 MW per meter of structure. Two‐beam accelerators can achieve peak powers of this order by applying dc pulse compression techniques (induction linac modules) to produce the drive beam. Klystron‐driven colliders achieve high peak power by a combination of dc pulse compression (modulators) and rf pulse compression, with about the same overall rf system efficiency (30–40%) as a two‐beam collider. A high gain (6.8) three‐stage binary pulse compression system with high efficiency (80%) is described, which (compared to a SLED‐II system) can be used to reduce the klystron peak power by about a factor of two, or alternatively, to cut the number of klystrons in half for a 1.0–1.5 TeV x‐band collider. For a 5 TeV klystron‐driven collider, a high gain, high efficiency rf pulse compression system is essential.
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