G. Carron, E. Jensen, M. Luong*, A. Millich, E. Rugo, I. Syratchev, L. Thorndahl (CERN, Geneva, Switzerland)
For the CLIC two-beam scheme, a high-current, long-pulse drive beam is required for RF power generation. Taking advantage of the 3 GHz klystrons available at the LEP injector once LEP stops, a 180 MeV electron accelerator is being constructed for a nominal beam current of 3.5 A and 1.5 microsecond pulse length. The high current requires highly effective suppression of dipolar wakes. The TDS (Tapered Damped Structure) concept developed for the CLIC main beam, with 4 SiC damped waveguides per cell, will be applied. The linac design features 'fully-loaded' operation, i.e. the forward power will decrease to almost zero at the end of each structure for the nominal beam current: this will allow a high RF-to-beam efficiency. A 4-cell prototype has been built and successfully tested at full power (40 MW). A full size 32-cell prototype is currently under test.
*) now at CEA-Saclay, DSM/DAPNIA/SEA, Gif-sur-Yvette, France
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