CLIC accelerator


Schematic layout of the CLIC
accelerator at 3 TeV

The CLIC accelerator collaboration is an international collaboration presently comprising ~60 institutes.

CLIC – the Compact Linear Collider – is a study for a future high-energy linear electron-positron accelerator, which is one of the options for the next collider to be built at CERN. CLIC is foreseen to be built and operated in three energy stages, starting with a first stage at 380 GeV, followed by successive stages at 1.5 TeV and 3 TeV. The luminosity performance increases with centre-of-mass energy from 1.5 * 1034 cm-2 s-1 at 380 GeV to 6 * 1034 cm-2 s-1 at 3 TeV.

In order to reach such high energies in a realistic and cost-effective scenario CLIC will use a novel 2-beam acceleration scheme. In this scheme Radio Frequency (RF) power at 12 GHz is extracted from a high-intensity 2.4 GeV drive beam. To this aim, the drive beam is decelerated in special Power Extraction and Transfer Structures (PETS), and the generated RF power is transferred to the main electron and positron beams. The main beam is accelerated in copper acceleration structures operated at room temperature. In the CLIC 2-beam acceleration scheme the gradient amounts to 100 MV/m. This scheme allows for a main linac tunnel layout without active RF components (i.e. klystrons).

The feasibility of CLIC has been demonstrated in large-scale tests, in particular at the CLIC Test Facility CTF3 located at CERN. The design is currently being optimised for the foreseen staging scenario and equipment tests on CLIC components, in particular on the acceleration structures, are ongoing.