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• W2603697421 abstract "LBNL-51027 The DFBX Cryogenic Distribution Boxes for the LHC Straight Sections Zbasnik, J. P; Corradi, C. A; Green M. A; Kajiyama, Y; Knolls, M. J; LaMantia, R. F; Rasson, J. E; Reavill, D; and Turner, W. C. Lawrence Berkley National Laboratory, Berkeley CA 94720, USA The DFBX distribution boxes are designed to connect the LHC cryogenic distribution system to the interaction region quadrupoles [1] and dipoles for the Large Hadron Collider (LHC). The DFBX distribution boxes also have the current leads for the superconducting interaction region magnets and the LHC interaction region correction coils. The DFBX boxes also connect the magnet and cryogenic instrumentation to the CERN data collection system. The DFBX boxes serve as the cryogenic circulation center and the nerve center for four of the LHC straight sections. This report describes primarily the cryogenic function of the DFBXs. THE FUNCTION OF THE DFBX The DFBX boxes are part of the contribution from the United States to the Large Hadron Collider (LHC) at CERN. The US LHC machine contribution also includes the final focusing low beta quadrupoles [1] for LHC interaction regions (IR) 1 2, 5 and 8 and superconducting dipoles on either side of IR 2 and 8. In IR 1 and 5, the superconducting dipoles are replaced with low field conventional dipoles from CERN. All four IRs have LHC superconducting corrector magnets, which are located within the low beta quadrupole string. The location of the DFBX within the left half of a LHC interaction region is illustrated in Figure 1. Figure 1 shows the location of the superconducting IR low beta quadrupoles, the IR correction magnets and the IR dipole (superconducting or conventional) with respect to the DFBX feed box. DFBX Feed box CERN Correction Magnets Absorber IR Center Q3 Q2b Q2a Q1 Experiment Straight Section WQX Low Quadrupoles Outboard WBX Dipole (S/C in IR 2 and 8, Conventional in IR 1 and 5) Figure 1 The Location of the DFBX with Respect to the Low Beta Quadrupoles, the Correctors, and the Outboard Dipole Table 1 Parameters of the DFBX Feed Boxes for Various LHC Interaction Regions IR Number DFBX Boxes A and B C and D E and F G and H Type of Dipole Conventional Superconducting Conventional Superconducting # 7.5 kA Leads # Other Leads IR Slope The DFBX connects the LHC helium cryogenic distribution system (the QRL) with the magnets. The cooling is supplied and returned to the LHC QRL distribution headers in four temperature ranges. 1.9 K cooling is supplied for the magnets. 4.4 K cooling is supplied for the magnet leads (both gas cooled and HTS leads) and busses. 20 K gas is used to cool from the top of the 7.5 kA high temperature superconductor (HTS) electrical leads and gas cooled leads to room temperature. Gas at 60 K cools the magnet and DFBX shields. In addition, the DFBX supplies cooling at 1.9 K to the LHC beam tube. The DFBX shares a common cryostat vacuum with the superconducting magnets on either side of the DFBX. A single LHC beam pipe that carries both beams passes through the middle of the DFBX." @default.
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• W2603697421 date "2002-07-05" @default.
• W2603697421 modified "2023-09-26" @default.
• W2603697421 title "The DFBX cryogenic distribution boxes for the LHC straight sections" @default.
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