  This report describes the physics potential and experiments at a future
multi-TeV e+e- collider based on the Compact Linear Collider (CLIC) technology.
The physics scenarios considered include precision measurements of known
quantities as well as the discovery potential of physics beyond the Standard
Model. The report describes the detector performance required at CLIC, taking
into account the interaction point environment and especially beaminduced
backgrounds. Two detector concepts, designed around highly granular
calorimeters and based on concepts studied for the International Linear
Collider (ILC), are described and used to study the physics reach and potential
of such a collider. Detector subsystems and the principal engineering
challenges are illustrated. The overall performance of these CLIC detector
concepts is demonstrated by studies of the performance of individual
subdetector systems as well as complete simulation studies of six benchmark
physics processes. These full detector simulation and reconstruction studies
include beaminduced backgrounds and physics background processes. After
optimisation of the detector concepts and adopting the reconstruction
algorithms the results show very efficient background rejection and clearly
demonstrate the physics potential at CLIC in terms of precision mass and cross
section measurements. Finally, an overview of future plans of the CLIC detector
and physics study is given and a list of key detector R&D topics needed for
detectors at CLIC is presented.
