Abstract-The

Abstract-The

Each superconducting coil of the ATLAS Barrel Toroid has to pass the commissioning tests on surface before the installation in the underground cavern for the ATLAS Experiment at CERN. Particular acceptance criteria have been developed to characterize the individual coils during the on-surface testing. Based on these criteria and the limited time of the test, a compressed test program was proposed and realized. In only a few cases some additional tests were required to justify the coil performance and acceptance. In this paper the analysis of the test results is presented and discussed with respect to the acceptance criteria. Some differences in the parameters found between the identical coils are analyzed in relation to coil production features.

Abstract-The ATLAS detector is presently under construction as one of the five LHC experiment set-ups. It relies on a sophisticated magnet system for the momentum measurement of charged particle tracks. The superconducting solenoid is at the center of the detector, the magnet system part nearest to the proton-proton collision point. It is designed for a 2 Tesla strong axial magnetic field at the collision point, while its thin-walled construction of 0.66 radiation lengths avoids degradation of energy measurements in the outer calorimeters. The solenoid and calorimeter have been integrated in their common cryostat, cooled down and tested on-surface. We review the on-surface set-up and report the performance test results.

The new AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) Experiment has the main goal to measure the Earth's gravitational acceleration of antihydrogen atoms. Two high-homogeneity superconducting 1 T and 5 T solenoids are placed on the same axis and provide the magnetic field required for the cylindrical Penning traps to catch and to accumulate antiprotons delivered by the Antiproton Decelerator of CERN. The solenoids have a free bore of 250 mm and 160 mm respectively and the overall system length is 3 m. The 1 T and 5 T solenoids are equipped with a set of superconducting correction coils charged by individual power supplies. In addition, there is a shielding coil to minimize the stray magnetic field in the measurement area. The solenoids and their sets of correction coils are constructed and tested at CERN. Before system integration the single coils are tested separately in a vertical cryostat. To guarantee smooth precooling of the impregnated coils a small volume of liquid nitrogen is placed inside the solenoid bore without direct thermal contact to the solenoid cold mass. The heat exchange and therefore the cool down rate are controlled by regulating the helium gas pressure in the cryostat. The final magnet control system is used for coil energizing and quench protection.In this paper the construction features of the AEgIS magnets as well as the test results are presented.