Installation of two HL-LHC Connection Cryostats in 11L2 and 11R2

Installation of two HL-LHC Connection Cryostats in 11L2 and 11R2, ready to receive the bypass

Thermal performance of the new superfluid helium vertical test cryostats for magnet tests at CERN

In the frame of the R&D; program of the HL-LHC, the upgrade of the Large Hadron Collider (LHC), CERN augmented its test facility with two new large-scale vertical test stations for superconducting magnet testing. The cryostats composing the core of these test stations share design features but are of different dimensions: one allows testing magnets up to 1.5 m diameter, 2.5 m long for a maximum weight of 15 t, while the other can accommodate magnets up to 0.9 m diameter, and 5.5 m long for a maximum weight of 18 t. These test stations are designed to operate at 1.3 bar and at controlled temperatures in the range 1.9 - 4.5 K. They can provide for safe dissipation of stored energy in the magnet coils of up to 10 MJ. After a brief description of the cryostats, this paper describes the qualification measurements of heat loads at 4.5 K and 1.9 K of both cryostats, some design enhancements that were made and the performance improvements obtained

Upgrade of the CERN Superconducting Magnet Test Facility

Abstract: The superconducting magnet test facility at CERN has hosted the series test of the majority of the LHC magnets. The facility has evolved, and is presently divided in two main areas: a vertical test facility, equipped with three vertical cryostats, and a horizontal test facility, with ten feedboxes for test of cryostated magnets in horizontal position. The test demands from construction projects, such as the high-luminosity LHC, or design studies, such as the future circular collider, are calling for a further upgrade. The new accelerator magnet technology based on Nb3 Sn and HTS superconductors, and the demand for higher bore field, result in high current (up to 30 kA), large cold mass dimensions (up to 1 m diameter), and increased stored energy (up to 1.5 MJ/m). To meet the new demands, two new vertical cryostats with their associated ancillary equipment are being built, and one horizontal test stand is being upgraded for operation at higher current. In addition, an upgrade of the cryogenic plant and services is planned to absorb the additional test needs. The paper gives the input parameters for the upgrade of the magnet test stations and the main characteristics of the new equipment

Design and Fabrication of FRESCA2 Cryostat

In the framework of the High Field Magnet activities, a new FRESCA2 test station (Facility for Reception of Superconducting Cables 2) was designed and fabricated at CERN to measure superconducting cables in background magnetic fields. This new facility relies on a Nb3Sn dipole magnet for generating a field of 13 T at temperatures in the range from 1.9 K to 50 K. The requirement to perform measurements twice a week entailed a double cryostat nested solution. TE-MSC prepared a functional specification including cryogenic processes and operation parameters for the nested cryostats; then gave mandate to EN-MME for the detailed design, fabrication and assembly. All MME services contributed to the project to face challenges brought by the electromechanical design of FRESCA2: advanced calculations following Pressure Equipment Directive PED standards), mechanical and cryogenic design, fabrication of large vacuum and pressure vessels with full QA-QC of the welding processes (including vacuum and pressure tests), high precision machining of large components and subassemblies, subcontracting, qualification of specific coating and metrology of components, complex assembly and manipulations with the support of EN-HE, integration of cryogenic (TE-CRG) and mechanical instrumentation. The paper reports all these activities