The CTF3 Drive Beam Linac - Why and How?

by Erk Jensen

Thursday 26 Sept 2002, 11:00 → 12:00 Europe/Zurich

PS Auditorium (CERN)

The drive beam of the CLIC two-beam scheme transports and stores energy in long, high current electron pulses at a relatively modest beam energy. Later temporal compression of the pulses, accompanied with frequency multiplication (in the compressor rings) allows to provide - by means of the power extraction and transfer structures (PETS) - very high peak power at 30 GHz necessary to accelerate the main beam. Hence the CLIC drive beam linac must cope with high beam currents, and as a major part of the power generation scheme, it must efficiently transfer power from RF to beam. One of the goals of CTF3 is to demonstrate this with a drive linac operating at 3 GHz. The high beam current requires strong damping of dipole wake fields, which is presently obtained by silicon carbide loads incorporated in a novel type of structure called SICA (for 'slotted iris - constant aperture'). The high RF to beam efficiency will be obtained by so-called 'fully loaded' operation, where the input power to an accelerating section is equal to the beam power increase in this section. The talk will explain these main features of the CTF3 drive linac in some detail and present results measured on the recently built prototypes.

Organiser(s): S. Baird / PS Division