Showing papers by "Raymond Veness published in 2001"
CERN1
TL;DR: In this article, the authors describe the numerous complex activities required to prepare the cryomagnets for the installation in String 2, including configuration of the mechanical interfaces, conditioning of the beam tubes, installation of beam screens and the instrumentation as well as the final checks.
Abstract: The numerous complex activities required to prepare the cryomagnets for the installation in String 2 are described. These include the configuration of the mechanical interfaces, the conditioning of the beam tubes, the installation of beam screens and the instrumentation as well as the final checks. The preparation of the cryomagnets for String 2 has been a dress rehearsal for the preparation that the cryomagnets will undergo before their installation in the tunnel. After a description of the interconnection procedures of the components for String 2, the tests carried-out to release the String for operation are described. A brief account of the lessons learnt is also given.
10 citations
TL;DR: In this article, a theoretical and empirical approach is performed showing the results and conclusions of the tests, and the results show that the Brazier effect can limit the design of vacuum chambers, requiring the addition of supports or changes in wall thickness.
10 citations
CERN1
TL;DR: The LHC requires a very low longitudinal and transverse beam coupling impedance, in particular at low frequencies as mentioned in this paper, which implies an admissible DC contact resistance of less than 0.1 m/spl Omega/ for the RIF contacts inside the vacuum bellows which must carry the image current (up to 50 A peak) of the beam at each vacuum chamber interconnect.
Abstract: The LHC requires a very low longitudinal and transverse beam coupling impedance, in particular at low frequencies. This implies an admissible DC contact resistance of less than 0.1 m/spl Omega/ for the RIF contacts inside the vacuum bellows which must carry the image current (up to 50 A peak) of the beam at each vacuum chamber interconnect. Technological aspects, measurement methods and test results are presented for the contacts which will be used in the LHC. The modified mechanical design and the justifications for specific choices will be discussed.
7 citations