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Synchrotron radiation issues in the VLHC

Description: Fermilab and other DOE high energy physics laboratories are studying the possibility of a Very Large Hadron Collider (VLHC) for operation in the post-LHC era. The current VLHC design [1] foresees a 2-staged approach, where the second stage (referred to as VLHC-2) has a proton energy up to 100 TeV at a peak luminosity of 2{center_dot}10{sup 34} cm{sup {minus}2} sec{sup {minus}1}. The protons are guided through a large 233 km circumference ring with 10 T bending magnets using Nb{sub 3}Sn superconductor at 5 K. The synchrotron radiation (SR) power emitted by the beam in such a machine is {approx}5 W/m/beam [1]. However, other VLHC scenarios (e.g. [2]) with smaller rings and higher luminosity result in SR power levels exceeding this value, reaching 10 or even 20 W/m/beam. Intercepting and removing this power in a cryogenic environment is a major challenge. In this paper a discussion of SR in the VLHC-2, and various approaches to the issue, are presented. One possibility is the use of a beam screen (BS) to intercept the synchrotron radiation power. The BS operating temperature is chosen to balance thermodynamic efficiency, cryogenic-, vacuum-, beam-stability- and magnet-aperture issues. Another approach is to intercept the radiation in discrete points between the with photon-stops (PS). The PS-s, having to intercept much higher power densities, are challenging components from engineering, vacuum, and beam-stability viewpoints.
Date: July 16, 2001
Creator: Bauer, Pierre; Darve, C.; Limon, P.; Solyak, N.; Terechkine, I.; Pivi, M. et al.
Partner: UNT Libraries Government Documents Department