Construction and Test of the Cello Thin-Wall Solenoid
01 Jan 1980-pp 175-184
TL;DR: In this paper, a superconducting solenoid has been constructed at Saclay and mounted on a large detector CELLO, which is one of the experiments installed on the e+e-colliding beam facility PETRA at DESY (Hamburg).
Abstract: A large thin-wall superconducting solenoid has been constructed at Saclay and mounted on a large detector CELLO. This is one of the experiments installed on the e+e- colliding beam facility PETRA at DESY (Hamburg).
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TL;DR: In this article, the effect of Hall currents on magnetoresistance of a superconducting cable is discussed. But the authors focus on the reduction of the Hall current in a short circuit model, where the basic mechanism is easily understood.
31 citations
20 Sep 2004
TL;DR: A few examples of superconducting magnet applications, representing a range in magnetic field, current density, and overall size, from the practical to the developmental are discussed.
Abstract: Since the discovery of superconductivity almost a century ago, there has been a steady increase in the variety of superconducting magnet applications. Progress in superconducting magnet technology has resulted in applications in areas of basic science, medicine, separation, and levitation. Performance improvements in a variety of materials, from low-temperature to high-temperature superconductors, are the foundation of recent rapid development. In addition, large increases in affordable computing power, along with steady refinement of three-dimensional analytical tools and improved materials characterization, have allowed many more advanced magnet concepts to be realized directly in hardware without scale prototype testing than was previously possible. This in turn has broadened opportunities for new science and technology results in many fields including the basic sciences, medical imaging, fusion, environmental remediation, and transportation. In this paper, a few examples of these applications will be discussed, representing a range in magnetic field, current density, and overall size, from the practical to the developmental.
21 citations
TL;DR: In this paper, an aluminium stabilized, thin superconducting solenoid is required for the central field of 1.5 T for the BABAR detector, which has dimensions of 3 m in diameter and 3.7 m in length.
Abstract: An aluminium stabilized, thin superconducting solenoid is required for the central field of 1.5 T for the BABAR detector. The winding is supported by an aluminium alloy outer cylinder, which provides hoop strength to the coil. The coil has dimensions of 3 m in diameter and 3.7 m in length. The current density is graded to meet the field uniformity requirements of /spl plusmn/2%. A hexagonal flux return, comprised of a barrel and two end doors provides the external flux path for the field. Additional material is required in the end caps to shield the flux from the beam line magnets. To accommodate the muon detectors, the barrel and end caps are segmented into 20 plates of different thickness. Special attention is given to the support of the coil and cryostat to account for seismic loading. The coil is indirectly cooled to 4.5 K using the liquid helium thermo-siphon technique and cooling channels welded to the support cylinder. Automatic cooldown and cryogen supply to the coil and its 40 K radiation shield is done by a helium liquefier/refrigerator via coaxial, return gas screened, flexible transfer lines.
17 citations
TL;DR: An overview of magnet insulation design, the introduction of stored energy scaling law on rated coil current, and the engineering contents of helical coils assembled into the Large Helical Device and excited in March 1998 as an example of insulation design are described in this article.
16 citations
TL;DR: In this paper, a thin superconducting solenoid magnet has been designed for the SDC detector, which is one of major colliding particle detectors for the SC high energy particle accelerator project.
Abstract: A thin superconducting solenoid magnet has been designed for the SDC detector, which is one of major colliding particle detectors for the SSC high energy particle accelerator project. Based on recent R&D efforts to develop a high strength aluminum stabilized superconductor and a honeycomb/isogrid vacuum shell, the thin solenoid has been designed to provide a central magnetic field of 2 T in a tracking volume of 3.4 m phi *8.8 m, with a magnet wall transparency 1.2 Xo. The authors describe the conceptual design and the R&D work. To minimize material in the solenoid, technical guidelines incorporated into the solenoid design are outlined, and material savings are discussed. The cryostat and cryogenic design are considered. A R&D program is in progress to develop a prototype solenoid magnet with a full diameter and a quarter length to verify the SDC solenoid design. >
16 citations
References
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01 Jan 1980
TL;DR: The superconducting magnet CELLO was tested with currents up to 3200 A at Saclay and has been installed at DESY in Hamburg where it will be used for particle physics experiments requiring colliding beams of electrons and positrons as mentioned in this paper.
Abstract: The superconducting magnet CELLO was tested with currents up to 3200 A at Saclay and has been installed at DESY in Hamburg where it will be used for particle physics experiments requiring colliding beams of electrons and positrons. The testing of this unique, large, one-layer solenoid provides an excellent opportunity to evaluate the theory of quench propagation under adiabatic conditions, that is, in a coil in which the conductors are not in direct contact with helium. In an early test of this coil, quenches occurred as a result of a broken conductor. This report describes the quenches that occurred, gives the details of the damaged conductor, and includes an analysis of the quenches. Observed axial quench velocities are compared to the calculated values based on both measurements and calculations of the thermal conductivity of the fabricated coil. The coil and conductor dimensions and characteristics are given in Table I The coil and conductor are shown in Fig. 1, and a complete description can be found elsewhere[1].
3 citations
01 Jan 1980
TL;DR: In this paper, the main components of the detector experiment CELLO in the e+e- storage ring PETRA at DESY/Hamburg are the superconducting magnet system.
Abstract: One of the main components of the detector experiment CELLO in the e+e- storage ring PETRA at DESY/Hamburg is the superconducting magnet system. The magnets have been developed as a joint project by CEN/Saclay and Kernforschungszentrum Karlsruhe. CEN has built the thin-walled main solenoid with a length of 3.5 m and a winding diameter of 1.7 m creating a magnetic field of 1.5 T in the center [1]. Two magnetically identical solenoids, located symmetrical to the main coil, must be positioned with a magnetic field opposite to the central field to cancel the integral field effect on the orbiting particle beams. This compensating solenoid system, including its supporting cryogenic system, has been designed and constructed by the Kernforschungszentrum Karlsruhe. The main coil was constructed with a wall thickness of ≤ λ/2 (equivalent to 45 mm of aluminum); this requirement was imposed by the radiation length λ of the generated particles. The compensating coils, on the other hand, were designed and built by conventional techniques for superconducting magnets. The solenoids within their cryostats are to be mounted in movable iron yoke doors surrounded by muon chambers and a liquid argon end cap calorimeter as shown in Fig. 1. The outer geometry and the required warm bore parameters determine the dimensions of the cryostats, i.e., a length of 1.10 m and an outer and inner diameter of the horizontal part of 0.8 and 0.4 m, respectively.
1 citations