Abstract :
=======
In the TESLA superconducting linear collider
project, collisions occur at zero crossing angle.
While the outgoing beams are extracted at about
40 m after the interaction point, the
beamstrahlung photons travel further upstream
along the incoming final focus beam line.
Moreover, the option to rapidly dump the spent
beams after the collision has been favoured
recently to avoid the inconveniencies of large
beam losses and beam line activation. For these
reasons, the design of the beam and beamstrahlung
extraction lines is interplayed with those of
the final focus optics and synchrotron radiation
masking. We propose a system where the beam
extraction is downward and where the beam and
beamstrahlung power is dumped at 240 m from the
IP. The power deposition along the beam lines
and beam transmission to the dump are found to
be acceptable. |
