SYNCHROTRON RADIATION ABSORBERS FOR HADRON COLLIDERS

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We present the results of a design study of synchrotron radiation absorbers, or photon stops, conducted in the context of a recent study of a Very Large Hadron Collider (VLHC), [1]. Photon stops protrude into the beam tube at the end of each bending magnet to absorb the synchrotron radiation emitted by the beams. They operate at room temperature and thus with minimal cooling power. Major issues regarding photon stops, namely those related to ring-size and magnet aperture, the engineering design, photo-desorption and vacuum, electron-emission, X-ray fluorescence and beam effects will be discussed. Simulations were performed on the basis of the VLHC in its second, high-field-magnet stage design, denoted as VLHC-2 in the following. We show that photon stops are

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