Conceptual designs of dipole magnet for muon collider ring

Conceptual designs of a superconducting dipole magnet for a Storage Ring of a Muon Collider with a 1.5 TeV center of mass (c.o.m.) energy and an average luminosity of 10 34 cm-2s-1 are presented. In contrast to proton machines, the dipoles for the Muon Collider should be able to handle ~0.5 kW/m of dynamic heat load from the muon beam decays. The magnets are based on Nb3Sn superconductor and designed to provide an operating field of 10 T in the 20-mm aperture with the critical current margin required for reliable machine operation. The magnet cross-sections were optimized to achieve the best possible field quality in the aperture occupied by beams. The developed mechanical structures provide adequate coil prestress and support at the maximum level of Lorentz forces in the coil. Magnet parameters are reported and compared with the requirements.Comment: 4 pp. Applied Superconductivity Conference (ASC 2010), 1-6 Aug 2010: Washington, D.

Experimental results and analysis from the 11 T Nb3Sn DS dipole

FNAL and CERN are developing a 5.5-m-long twin-aperture Nb3Sn dipole suitable for installation in the LHC. A 2-m-long single-aperture demonstrator dipole with 60 mm bore, a nominal field of 11 T at the LHC nominal current of 11.85 kA and 20% margin has been developed and tested. This paper presents the results of quench protection analysis and protection heater study for the Nb3Sn demonstrator dipole. Extrapolations of the results for long magnet and operation in LHC are also presented.Comment: 10 pages, Contribution to WAMSDO 2013: Workshop on Accelerator Magnet, Superconductor, Design and Optimization; 15 - 16 Jan 2013, CERN, Geneva, Switzerlan

Design and Assembly of a Large-aperture Nb3Sn Cos-theta Dipole Coil with Stress Management in Dipole Mirror Configuration

The stress-management cos-theta (SMCT) coil is a new concept which has been proposed and is being developed at Fermilab in the framework of US Magnet Development Program (US-MDP) for high-field and/or large-aperture accelerator magnets based on low-temperature and high-temperature superconductors. The SMCT structure is used to reduce large coil deformations under the Lorentz forces and, thus, the excessively large strains and stresses in the coil. A large-aperture Nb3Sn SMCT dipole coil has been developed and fabricated at Fermilab to demonstrate and test the SMCT concept including coil design, fabrication technology and performance. The first SMCT coil has been assembled with 60-mm aperture Nb3Sn coil inside a dipole mirror configuration and will be tested separately and in series with the insert coil. This paper summarizes the large-aperture SMCT coil design and parameters and reports the coil fabrication steps and its assembly in dipole mirror configuration

Characteristics of Somatic Status and Individual Biochemical Markers in Patients with Retinal Vein Occlusion

Retinal vein occlusion is one of the most severe vascular lesions of the organ of vision, usually accompanied by somatic pathology.The aim of the study was to study the somatic status and individual biochemical markers in patients with retinal vein occlusion and comparison in groups opposing the effectiveness of anti-VEGF therapy.Methods. 84 patients with macular edema were examined on the background of retinal vein occlusion, who underwent intravitreal injections of an angiogenesis inhibitor for therapeutic purposes. Further, depending on the effectiveness of treatment, the patients were divided into 2 groups, in which a retrospective comparative analysis of somatic status and laboratory data was performed.Results. It was shown that patients with occlusion of the retinal veins have significant impairments in terms of somatic status, blood biochemical parameters and coagulogram. Moreover, there is a direct relationship between the severity of somatic changes and ocular manifestations of the disease. The data obtained reflect a clear tendency in patients with occlusion of the retinal veins to a high risk of cardiovascular complications, including occlusive lesions. In patients with an insufficient treatment effect, a more severe course of arterial hypertension with an increased risk of stratification was detected.Conclusion. The somatic status and laboratory parameters of patients with retinal vein occlusion are significantly different from the norm, which must be taken into account in the prognosis of the course of an ophthalmologic disease