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• W198331345 abstract "The Large Hadron Collider (LHC) project requires the modification of the existing extraction channel in the long straight section 6 of the CERN Super Proton Synchrotron (SPS). The new extraction will be used to transfer protons at 450 GeV/c as well as ions via the 2.8 km long transfer line TI 2 to the clockwise ring of the LHC. As the resonant extraction to the present SPS West Area will be stopped after 2004, the electrostatic septa will be replaced by new fast extraction kicker magnets. The girder for the existing DC septa will be modified to accommodate a new septum protection element. Other modifications concern the replacement of a machine quadrupole, a new scheme for the extraction bumpers, new instrumentation and interlocks. The requirements and the design of the new extraction channel will be described as well as the modifications which will mainly be carried out in the long SPS shutdown 2005. INTRODUCTION At present the long straight section LSS6 of the Super Proton Synchrotron (SPS) at CERN, is used for the resonant extraction towards experiments in the West Area. After the closure of this area at the end of 2004, the straight section will be used to transfer protons at 450 GeV/c as well as ions via the 2.8 km long transfer line TI 2 to the clockwise ring of the LHC. FAST EXTRACTION REQUIREMENTS The fast extraction channel in SPS LSS6 will be used only for small emittance LHC beams. The relevant nominal beam parameters are summarised in Table 1. The value in parenthesis refers to the ultimate beam parameters. Table 1: Main parameters of LHC beam in the SPS. Protons per spill (10) 3.2 (4.9) Spill length 7.8 μs Emittance (1σ norm.) 3.5 μm Injection energy 26 GeV/c Extraction energy 450 GeV/c The design has to satisfy the following conditions. • Large enough vertical and horizontal aperture for injected, bumped circulating and extracted beams. the large emittance (14 μm emittance) CNGS beam must be accommodated at 14 GeV injection energy. • The various field errors and supply ripples should be low enough for acceptance by the LHC [1]. • The extraction system should be adequately protected against mis-steered beams. CONCEPT After the run in 2004, when the shutdown starts, the electrostatic septa will be replaced by fast extraction kicker magnets. The girder for the existing DC septa will be modified to accommodate a new septum protection element called TPSG6. The extraction region is shown in Fig. 1. The magnetic lattice in LSS6 will remain unchanged with respect to the present SPS optical design. Other modifications concern the replacement of an enlarged machine quadrupole by a standard one, a new scheme for the extraction bumpers, new beam instrumentation and the necessary interlocks. 0 10 20 30 40 50 60 70 80 90 100 6273 6289 6305 6321 6337 6353 6369 6385 6401 S [m] X [m m ] Figure 1: Extraction region in LSS6, showing injected 5σ CNGS beam envelope (blue), bumped 4σ LHC beam (black) and extracted 4σ LHC beam (red). SYSTEMS AND PERFORMANCE" @default.
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• W198331345 date "2004-01-01" @default.
• W198331345 modified "2023-09-27" @default.
• W198331345 title "The Design of the New Fast Extraction Channel for the LHC" @default.
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