Search

The Falcon Dipole (Future Accelerator post-LHC Cos-theta Optimized Nb3Sn Dipole) is a single aperture Nb3Sn cos-theta dipole short model in the framework of the Future Circular Collider (FCC) project. The Italian Institute of Nuclear Physics (INFN), in collaboration with CERN, is in charge of designing and constructing the magnet, which is a crucial step towards the construction of High Field Nb3Sn magnets suitable for a post LHC collider. This paper recalls the electromagnetic design, the field quality and performances of the Falcon Dipole. The coil ends design has been implemented in a 3D FEM to study the peak field distribution on the magnet and influence on field quality. A special focus is given to the 2D analysis to study the effect of superconductor magnetization on field quality from the injection to the final energy and then to investigate the effectiveness of compensation methods. [ABSTRACT FROM AUTHOR]

After LHC is turned off, a new accelerator machine will be needed in order to explore unknown regions of high-energy particle physics. For this reason, the project Future Circular Collider (FCC) has started at CERN, with the target of studying the feasibility of a very large hadron collider with 50-TeV proton beams in a 100-km circumference. The EuroCirCol project is part of the FCC study under European Community leadership. In particular, it has the outcome of producing a conceptual design of the FCC within 2019. One of the main activities is the development of 16-T superconducting dipole able to produce a bore field, in order to bend the beams within energy and size constraints. Here, we present the conceptual design of a Nb3Sn cos θ dipole in double-aperture configuration (LHC-style). We show that it is possible to produce a bore field of 16 T with a good field quality, with reasonable assumptions on the conductor features, and with a reasonable amount of cable. A bladders and keys mechanical structure is also presented, proving that the electromagnetic forces can be maintained, keeping the stress in the coils within a safe limit. Finally, we present a preliminary quench study, showing that the magnet can be protected using well-known technologies. [ABSTRACT FROM AUTHOR]

An all permanent magnet superbend is proposed for the new Sirius optics and it can now provide hard X-rays in a critical energy of 19 keV. In the new design, the superbend has a stronger magnetic peak field of 3.18 T and it is composed of two low field parts designed with a transverse gradient on each side of the high field pole. The full magnet is joined into a single permanent magnet named BC and a floating pole links all three parts. The low field poles, the floating poles, and the return flux in the back can be adjusted to correct the integrated dipole and quadrupole components. The magnetic and mechanical design, assembly, magnetic measurements, and production strategy will be presented. [ABSTRACT FROM AUTHOR]

The beam separation dipole magnet (D1), which is being operated in the large hadron collider (LHC), has to be replaced in accordance with upgrade to the high-luminosity LHC. The new D1 will be equipped with several circuits of heaters by which most of the stored energy is dissipated in the whole of the magnet during its quench, thereby avoiding localization of hot spots. Prior to construction of the production magnet, the 2-m mechanical short model is fabricated, and performance of this quench protection heater is evaluated through a series of the cold tests. As a result, we confirm that the maximum hot spot temperature obtained in the measurement reaches the practical limit of 300 K, and determine to design a new heater circuit. In this paper, we report the heater studies together with the prospect for future design of the quench protection heater. [ABSTRACT FROM AUTHOR]

Future high-energy accelerators will need very high magnetic fields in the range of 20 T. The EuCARD-2 WP10 Future Magnets collaboration is aiming at testing HTS-based Roebel cables in an accelerator magnet. The demonstrator should produce around 17 T, when inserted into the 100-mm aperture of Feather-M2 13-T outsert magnet. HTS Roebel cables are assembled from meander-shaped REBCO-coated conductor tapes. In comparison with fair level of uniformity of current distribution in cables made out of round Nb–Ti or Nb${}_{3}$ Sn strands, current distribution within the coils wound from Roebel cables is highly nonhomogeneous. It results in nonuniform electromagnetic force distribution over the cable that could damage the very thin REBCO superconducting layer. This paper focuses on the numerical models to describe the effect of the nonhomogeneous current distribution on stress distribution in the demonstrator magnet designed for the EuCARD-2 project. Preliminary results indicate that the impregnation bonding between the cable glass fiber insulation and layer-to-layer insulation plays a significant role in the pressure distribution at the cable edges. The stress levels are safe for Roebel cables. Assuming fully bonded connection at the interface, the stresses around the edges are reduced by a large factor. [ABSTRACT FROM PUBLISHER]

After Large Hadron Collider will be turned off, a new, more energetic machine will be needed in order to explore unknown regions of the high-energy physics. For this reason, the project Future Circular Collider (FCC) has started, with the goal of developing a 100-km-circumference collider of 50 TeV proton beams. The Eurocircol collaboration is part of the FCC study under the European Community leadership, and it aims to develop a conceptual design of FCC till 2019. One of the main targets is to design a bending dipole able to reach 16 T operation magnetic field, in order to accomplish the size and energy constraints. Such a magnetic field can be reached using Nb3Sn conductors. One option under exploration is the Cosθ dipole, by INFN of Milano and Genova. Because of the high stored energy and the large current densities due to the conductor performances, quench protection is one of the most challenging aspects of the design. In this paper, the quench protection of the cosθ design is presented. A standard quench protection study is accompanied by a less conservative study which includes ac effects on the power dissipation inside the coils and on the magnet inductance, in order to not exclude preventively more convenient designs, and to develop a more performing magnet as possible. [ABSTRACT FROM PUBLISHER]

We report the development of a new approach to dipole technology, based upon cable-in-conduit conductor, that optimizes the cost and performance for a future ultimate-energy hadron collider. Optimization of cost for an ultimate-energy hadron collider is dominated by the strong dependence of magnet cost and synchrotron radiation power upon the dipole field strength. Assuming that the collider is built at a site with minimum tunnel cost, the projected total project cost is minimum for a ∼4 T dipole field. We present a novel option in which the double-ring of magnets is housed in a circular pipeline, submerged with neutral buoyancy at a depth ∼100 m in the sea. Such a collider inscribed in the Gulf of Mexico would provide hadron collisions at 500-TeV energy with a luminosity of 5 × 1035 cm−2s−1. We describe here the design of the dipole and of the pipeline cryostat that would contain it. [ABSTRACT FROM PUBLISHER]