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Title: Construction and bench testing of a prototype rotatable collimator for the LHC
Authors: Markiewicz, Thomas Walter
Bong, Eric
Keller, Lewis P.
Aberle, Oliver
Bertarelli, Alessandro
Gradassi, Paolo
Marsili, Aurelien
Redaelli, Stefano
Rossi, Adriana
Salvachua, Belen
Valentino, Gianluca
Keywords: Collimators (Optical instrument)
Large Hadron Collider (France and Switzerland)
Issue Date: 2014
Publisher: Joint Accelerator Conferences Website (JACoW)
Citation: Markiewicz, T., Bong, E., Keller, L., Aberle, O., Bertarelli, A., Gradassi, P.,...Valentino, G. (2014). Construction and bench testing of a prototype rotatable collimator for the LHC. 5th International Particle Accelerator Conference, IPAC 2014, Dresden. 178-181.
Abstract: A second generation prototype rotatable collimator has been fabricated at SLAC and delivered to CERN for further vacuum, metrology, function and impedance tests. The design features two cylindrical Glidcop jaws designed to each absorb 12 kW of beam in steady state and up to 60 kW in transitory beam loss with no damage and minimal thermal distortion [1]. The design is motivated by the use of a radiation resistant high Z low impedance readily available material. A vacuum rotation mechanism using the standard LHC collimation jaw positioning motor system allows each jaw to be rotated to present a new 2 cm high surface to the beam if the jaw surface were to be damaged by multiple full intensity beam bunch impacts in a asynchronous beam abort. Design modifications to improve on the first generation prototype, pre-delivery functional tests performed at SLAC and post-delivery test results at CERN are presented.
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