LEP2 synchrotron-radiation issues. J.M. Jimenez. Main Topics. Introduction Vacuum requirements Vacuum engineering considerations What was learnt? Closing Remarks. Introduction Accelerator vacuum requirements.
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Typical composition of photon-stimulated desorption: 75% H2, 24% CO/CO2, 1% CH4
…combined with ion pumps
Courtesy P. Chiggiato TS/MME
C. Benvenutiet al.J.Vac.Sci.Technol A 16(1) 1998
Secondary Electron Yield
…being successfully used in SR facilities
C. Scheuerleinet al.Appl.Surf.Sci 172(2001)
PSD at ESRF
Some evidences exist that a large part of the remaining desorption after activation could be due to a small fraction of the photons flux striking outside the chamber
Courtesy ofP. Chiggiato
CH4 desorption yield reduced by a factor of at least 200 after activation, no Kr degassing detected