CLIC, a 0.5 to 5 TeV e(+/-) compact linear collider

The CLIC study of high-energy (0.5-5 TeV), high-luminosity (10(34)-10(35) c m(-2) s(-1)) e(+/-) linear collider is presented. Beam acceleration using h igh-frequency (30 GHz) normal-conducting structures operating at high accel erating fields (100 to 200 MV/m) significantly reduces the length and, in c onsequence, the cost of the linac. Based on new beam and linac parameters d erived from a recently developed set of general scaling laws for linear col liders, the beam stability is shown to be similar to lower frequency design s in spite of the strong wake-field dependency on frequency. A new cost-eff ective and efficient drive beam generation scheme for RF power production b y the so-called Two Beam Acceleration (TBA) method is described. It uses a thermionic gun and a fully-loaded normal-conducting linac operating at tow frequency (937 MHz) to generate and accelerate the drive beam bunches, and RF multiplication by funnelling in compressor rings to produce the desired bunch structure. Recent 30 GHz hardware developments and results from the C LIC Test Facility (CTF), assessing the feasibility of the scheme, are descr ibed.