Crossing angle at the photon collider

Details Crossing angle at the photon collider Crossing angle at the photon collider

2005-07-18

arxiv.org/abs/physics/0507134v1

Physics

Accelerator Physics

Talk at 2005 International Linear Collider Workshop, Stanford Ca(LCWS05) 6 pages, LaTeX, 4 eps figures, PSN code 1113

Scientific paper

For removal of disrupted beams at the ILC linear e+e- collider it is desirable to collide beams at some crossing angle. An especially large crossing angle, of about 25 mrad, is necessary for the photon collider, where disrupted beams are softer and wider than in the e+e- case. Some complications arise due to the solenoidal magnetic field of the detector. Radiation of particles in this field can increase the vertical beam size, leading to a loss of the luminosity. In addition, in the presence of a detector magnetic field the beam trajectories are not flat. Moreover, in the case of e-e- beams, the vertical collision angle is non-zero and larger than the beam diagonal angle sigma_y/sigma_z, and this should be corrected in some way. In this paper, possible solutions of these problems are considered. It is shown that at the ILC one can have the interaction region compatible both with e+e- and gamma-gamma, gamma-e modes of operation without loss of luminosity.

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