Cooling of the Synchrotron Radiation Shield in the Eloisatron Magnets
Heating by synchrotron radiation from a proton beam starts to create problems at high beam intensities in the superconducting magnets of the Superconducting Super Collider (SSC)1 in the USA and of the Large Hadron Collider (LHC)2 at CERN, but its consequences are conspicuous in the ELOISATRON design3, even at the modest beam intensity foreseen in the present parameter list4. For a preliminary evaluation, the parameters in table 1 are assumed. With these parameters, the synchrotron radiation at top energy would have a critical energy of 10.7 keV, and the radiated power per unit length of dipole field would be 1.84 W/m. Such a heat load would be unacceptably large for the ELOISATRON magnets, which are assumed to be cooled by helium II at 1.8 K (with a planned specific load of less than 0.2 W/m). It is therefore essential for the synchrotron radiation power to be almost entirely intercepted by a shield, cooled by ordinary helium. For obvious reasons of space this shield would best consist, at least inside the magnets, of the beam chamber itself.
KeywordsLarge Hadron Collider Mass Flow Rate Synchrotron Radiation Copper Coating Total Pressure Drop
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