• E. Gschwendtner, A. Apyan, K. Elsener, A. Sailer, J.A. Uythoven
  CERN, Geneva
• R. Appleby, M.D. Salt
  UMAN, Manchester
• A. Ferrari, V.G. Ziemann
  Uppsala University, Uppsala

The 1.5TeV CLIC beams, with a total power of 14MW per beam, are disrupted at the interaction point due to the very strong beam-beam effect. As a result, some 3.5MW reach the main dump in form of beamstrahlung photons. About 0.5MW of e⁺e^- pairs with a very broad energy spectrum need to be disposed along the post-collision line. The conceptual design of this beam line will be presented. Emphasis will be on the optimization studies of the CLIC post-collision line design with respect to the energy deposition in windows, dumps and scrapers, on the design of the luminosity monitoring for a fast feedback to the beam steering and on the background conditions for the luminosity monitoring equipment.

• E. Gschwendtner, K. Elsener
  CERN, Geneva
• R. Appleby, M.D. Salt
  UMAN, Manchester
• A. Apyan
  Fermilab, Batavia
• A. Ferrari
  Uppsala University, Uppsala

The 1.5TeV CLIC beams, with a total power of 14MW per beam, are disrupted at the interaction point due to the very strong beam- beam effect. The resulting spent beam products are transported to suitable dumps by the post-IP beam line, which generates beam losses and causes the production of secondary cascades towards the interaction region. In this paper the electromagnetic background at the IP are presented, which were calculated using biased Monte Carlo techniques. Also, a first estimate is made of neutron back-shine from the main beam dump.