Design and test of the benches for the magnetic measurement of the LHC dipoles

Abstract

commissioning are described. magnets. The bench and its performance and precision achieved during its an important issue during production measurements of large series of automated, computer-controlled operation requiring a minimum of staff, emphasis has been put on the user-friendliness of the bench and its placed outside the magnetic field without space restrictions. Particular motor, an angular encoder and a level meter, all standard components very high rotational stiffness and which is controlled from its far end by a mounted at one end of a 12.5 m long shaft which is specially designed for at room temperature. This coil, together with Hall and NMR detectors is installed inside the magnet cold bore, thus allowing the use of rotating coils integrals. The measurements will be carried out along a warm bore content of higher harmonic field components, field direction and field The magnetic measurement of more than 1300 LHC dipoles comprises the Ahstrggt ].

A decommissioned LHC model magnet as an axion telescope

“…They have straight cold bores of 42.5 mm aperture. All these magnets have been tested and measured magnetically on a bench in the SM18 facility at CERN [36]. Three of the seven magnets tested underwent a thorough life test.…”

Test results on the long models and full scale prototypes of the second generation LHC arc dipoles

“…The power test campaigns of all dipoles are carried out on the Magnet Test Bench Facility [8] in two different runs separated by a thermal cycle from 1.8 K to 300 K and then back to 1.8 K. The magnets are protected against quench induced damages by means of quench heaters and extraction of about 25% of the energy [9]. The energy extraction actually is only about 15% for the full length prototype, Al.…”

“…The warm measurements [7] were carried out at a test field of 10 mT, while cold measurements [8] were performed over the entire dipole field range.…”

A system for series magnetic measurements of the LHC main quadrupoles

“…The SSS measurement system is a modification of an existing automatic scanner used previously for the field measurement of the first 10-m long LHC dipole prototypes [2]. The measurement principle of the original system is to use a slender rotating coil placed in the magnet bore to map the angular dependence of the field in the magnet cross-section and thus obtain information on field harmonics and field center within the frame of the rotating coil axis.…”