Overview of the Compact Linear Collider

The CLIC study is exploring the scheme for an electron-positron collider with a center-of-mass energy of 3 TeV in order to make the multi-TeV range accessible for lepton physics. The current goal of the project is to demonstrate the feasibility of the technology by the year 2010. Recently, important progress has been made concerning the high-gradient accelerating structure tests and the experiments with beam in the CLIC test facility, CTF3. Several important aspects of the project are dealt with through international collaborations, which has considerably boosted the CLIC study.

Figure 1

The CLIC layout for 3 TeV (not to scale).

Figure 2

Chart of vertical versus horizontal geometric emittances for different projects with energies below 5 GeV, showing the challenge to generate the CLIC DR emittances at 3 TeV.

Figure 3

Longitudinal phase space of the bunch after tracking through the entire RTML.

Figure 4

CTF3 layout.

Figure 5

Intensity versus time as measured at two different devices of the CTF3 combiner ring, showing the bunch recombination from 3 A beam to 12 A.

Figure 6

PETS measured and reconstructed power.

Figure 7

Test accelerating cavity for the CLIC main beam, T18_vg2.4_disk, designed at CERN, built at KEK, and assembled and tested at SLAC.

Figure 8

Performance of two CLIC-like accelerating structure T18_vg2.4_disk meeting the CLIC specifications during unloaded operation without damping and after about 1200 hours of conditioning. T18[2] was conditioned differently than T18[1]; this might explain the slight difference in breakdown rate. CLIC structures operate loaded and with damping.

Figure 9

Demonstration of stabilization to the subnanometer level via ground isolation and structure resonance rejection in a quiet environment [45].