Abstract
The design and construction of a 120-mm wide-aperture, Nb-Ti superconducting quadrupole magnet for the Large Hadron Collider (LHC) insertion region is part of a study towards a luminosity upgrade of the LHC at CERN, envisaged for 2020-22. The main challenges for this accelerator quality magnet are to operate reliably with the high heat and radiation loads that are predicted in the insertion magnet regions. Calculations give approximately 500 Watts over the 30-m-long string of insertion magnets, while today LHC is operating for a nominal heat load of 12 Watts. To extract this heat, the model magnets incorporate new features: Open cable insulation, open ground insulation, open magnet structure, and a quench heater that has open channels to help extract the steady state heat load. This paper presents results from tests at room temperature and 1.8 K for the initial model magnet. We report magnet training, transfer function and field quality measurements, quench heater performance, and heat extraction studies using imbedded heaters to simulate the deposited beam heating profile.
Highlights
FOR the phase-1 luminosity upgrade of the Large Hadron Collider at CERN, a development program was started in 2007 in collaboration with CEA Sacly to develop a (Nb-Ti) 120 mm aperture quadrupole with a gradient of 120 T/m and the ability to extract very high heat loads on the order of 500 W. This quadrupole, called MQXC [1,2,3,4] had the innovative feature of a insulation scheme allowing a direct path from the helium bath to the superconducting strands [5]
MQXC was needed for a backup technology in case the Nb3Sn magnet could not achieve the design targets and reliability within a relatively short time scale of about10 years
We describe the final assembly of the first 1.8m-long model magnet, MQXC(0), that was assembled at CERN; we describe the test setup, the measurement of the room temperature field harmonics, as well as results in terms of training, quench performance, and quench location
Summary
FOR the phase-1 luminosity upgrade of the Large Hadron Collider at CERN, a development program was started in 2007 in collaboration with CEA Sacly to develop a (Nb-Ti) 120 mm aperture quadrupole with a gradient of 120 T/m and the ability to extract very high heat loads on the order of 500 W. This quadrupole, called MQXC [1,2,3,4] had the innovative feature of a insulation scheme allowing a direct path from the helium bath to the superconducting strands [5]. Special tests were carried out to study heat extraction, with encouraging results
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