Speaker
Description
A gamma-gamma collider capable of reaching the multi-TeV frontier of particle physics may enable the study of phenomena beyond the Standard Model. Based on compact linear wakefield accelerator technology, such a collider could be realized by Compton scattering multi-TeV lepton beams off moderate-intensity laser pulses close to the collider interaction point, producing the required gamma-photons. It is shown that, for a wide range of scattering-laser wavelengths, gamma-gamma collisions at the interaction point can meet the luminosity requirements for novel particle physics studies, even in the presence of the prolific electron-positron pair production that accompanies the interaction of the scattering laser with the multi-TeV lepton beam. It is shown that an enhancement in gamma-gamma collider luminosity can be achieved for 250 nm and 1.25 nm scattering lasers. These enhanced luminosities need to be compared to that of the electron-positron colliders, which also have a number of important interaction point physics problems. In particular, whether the beamstrahlung, electron-positron pair production, and beam disruption can limit the physics reach of such a collider. It is shown that in the strong beamstrahlung regime the high energy collision luminosity is significantly reduced due to photon emission, making gamma-gamma collider option more attractive. The amount of reduction depends on the beamstrahlung strength, which is controlled by the particle bunch charge, length, emittance, and beta function. The obtained results favor the use of extremely short electron-positron bunches for the future collider design.