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T: Fachverband Teilchenphysik
T 78: Beschleunigerphysik 1
T 78.4: Talk
Monday, March 9, 2009, 17:45–18:00, A213
Halo and Tail Generation studies for low energies and application to the CLIC drive beam — •Miriam Fitterer1,2,3, Anke-Susanne Müller1,2,3, and Helmut Burkhardt1 — 1CERN, Geneva — 2FZK, Eggenstein — 3University of Karlsruhe, Karlsruhe
The Compact Linear Collider (CLIC) study aims at a center-of-mass energy range for electron-positron collisions of 0.5 to 5 TeV, optimised for a nominal center-of-mass energy of 3 TeV. In order to reach this energy, the accelerating gradient has to be very high: an acceleration of 100 MV/m for an RF frequency of 12 GHz. Superconducting technology is fundamentally limited to lower gradients, only room temperature travelling wave structures can achieve such high gradients. Conventional high frequency RF sources do not provide sufficient RF power for this high gradient, so CLIC relies upon a two-beam-acceleration concept: The 12 GHz RF power is generated by a high current electron beam (drive beam) with an initial energy of 2.371 GeV and a final energy of 0.237 GeV running parallel to the main beam. This drive beam is decelerated in special power extraction structures (PETS) and the generated RF power is transfered to the main beam. Significant beam losses can be caused by halo and tail generation and the aim is to predict and minimize the halo. Previous studies were mainly focused on very high energies as relevant for the beam delivery systems of linear colliders or the CLIC main beam. We have now studied halo and tail generation for lower energies as relevant for the CLIC drive beam.