In order to actively protect the energy collimator from an accidental beam loss, a fast
extraction beam line must be included in the TESLA beam delivery systems. It should also
allow a steady beam extraction for linac and positron source commissioning while the beam
delivery systems and/or the interaction region are not ready to accept beams.
A design for such an emergency extraction beam line is presented here. The main challenge
is to provide the sufficient aperture to accept the large bunch energy errors which will
trigger the extraction kickers, and the large angular errors inherent to the fast kicker design.
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