Energy and Inductance of a HTS Magnet with Various Aspect Ratios
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Abstract:
When the aspect ratio of a magnet varies, the magnetic field in the magnet also varies. The critical current of a tape-shaped HTS wire varies with the direction and magnitude of applied magnetic field. Consequently when the aspect ration of a HTS magnet varies, the critical current of a HTS magnet varies. This paper shows the relation between the aspect ratio of a magnet and the energy and inductance of a HTS magnet. The critical current is also shown at various aspect ratio of the magnet. The length of the HTS wire, inner diameter of the magnet, and number of pancake are chosen to be variables which varies the shape of the magnet. For a HTS magnet consisting of pancake windings, calculation results show the number of pancake windings are the prime factor which varied the energy and inductance of the magnet. The inner diameter of the magnet varies the energy and inductance of the magnet a little.Keywords:
Dipole magnet
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The SIS 100 will be the world's second fast ramped synchrotron for heavy ion research using superconducting magnets. We summarize the experimental results obtained on two full size model magnets and present the design choices made for the SIS100 dipole. The main design components of the magnet are outlined. Special attention is given to an optimal adjustment of the following topics crucial for reliable and effective operation of the magnets: mechanical stability of the coil windings, magnetic steel, field design, temperature field, AC losses and the vacuum chamber. We conclude that the present dipole design principles are consolidated and are close to series production.
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There is an interest to design superconducting magnet systems working in a persistent current mode. These systems continuously generate magnetic field with disconnected power source working like permanent magnet devices. In this paper proposed a magnet system concept based on the direct mechanical energy transfer in the magnetic field. Short circuited superconducting coils do not have current leads and power source. To pump the mechanical energy in the superconducting coil used a magnetizer which magnetically coupled with the coil. The mechanical removing the magnetizer from the magnet induces a persistent current in the superconducting coil which generates the magnetic field. Iron dominated magnet system concept was investigated using OPERA3d code which confirmed a visibility of proposed approach.
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A design study of a high-field superconducting dipole magnet for the LHC (Large Hadron Collider) project has been carried out in cooperation between CERN and KEK. The objective is to develop a 1-m twin-aperture dipole model magnet based on double shell coil design with a fully symmetric split collaring structure. Development of superconducting cable with high keystone angle is a key technology to realize this magnet. The progress made in the design study and the development of the 1-m dipole model magnet are described.
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A simple method to derive the temperature profile in a superconducting magnet during a quench from measured voltage signals is described. The method was applied to several Large Hadron Collider single aperture dipole models. These measurements show the strong correlation between parameters of the magnet protection system and powering on the one hand and the resulting temperature gradient in the magnet coil on the other. The method allows the localisation of critical points in the magnet design, in particular, the efficiency of the magnet protection system can be evaluated.
Dipole magnet
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In order to generate a dipole permanent magnet with magnet field strength several as much as the remanence B/sub r/ of permanent magnet material, an enhanced hollow cylinder permanent magnet array (HCPMA) or magic ring structure is presented, which is made of permanent magnet and ferromagnetic material. Using ferrite with B/sub r/ only 0.375 tesla and electric Armco iron, the prototype of dipole permanent magnet in this paper can generate a field whose max flux density is 0.865 tesla in the center of cylindrical pole gap, the volume of which is 24 mm in diameter multiplied 85 mm in length with external diameter equal about to 414 mm.
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A comparative design study was made for windings of a superconducting 10 T dipole magnet, which could be used for a future large accelerator. Calculations were done for different magnet winding design types; given a few simplifying assumptions, their general magnetic and mechanical parameters were obtained. The four shell configuration seemed to show the most promise of all the magnet designs considered for a 10 T small aperture (5 cm) dipole magnet.
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KEK has been developing a beam separation dipole magnet for the high luminosity large hadron collider upgrade. The magnet has a coil aperture of 150 mm and uses NbTi superconducting cable. A dipole magnetic field of 5.6 T is generated at 12 kA at 1.9 K to provide a field integral of 35 T·m. KEK has started the development of the first 2-m-long model magnet to evaluate the design and performance of the beam separation dipole magnet. The excitation test at 1.9 K of the first 2-m-long model magnet was performed from April to June 2016 at KEK. This paper presents the results of the magnetic field measurements of the first 2-m-long model magnet by a rotating coil probe.
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The mathematical model of magnetic field produced by the permanent magnet is a key problem on magnetic localization of micro-medical devices in human body.Magnetic dipoles model and equivalent magnetic monopoles model are two often used models for obtaining static magnetic field distribution.The two models were used to simulate the magnetic field of cylinder magnet used in the drug delivery capsule.The calculation results of the two models are very close when the distance between the field point and the magnet is larger as 10 times of the magnet's size.The real experiments on the experimental device approved the simulation results,which mean that the magnetic dipoles model is suitable for magnetic localization of micro-medical devices in human body when the distance between the magnet and the magnetic sensor is larger as 10 times of the magnet's size.
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Dipole magnet
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There were designed and successfully tested at Fermilab several high temperature superconducting (HTS) model magnets for particle accelerators. Some of them worked in a persistent current mode continuously generating magnetic field in the iron dominated magnet gap. In the paper was investigated a novel HT dipole magnet concept with a mechanical energy transfer in the magnetic field. To pump the energy in the superconducting HTS dipole magnet used a detachable magnetizer. The HTS dipole magnet was build and successfully tested at a liquid nitrogen temperature. Discussed the magnet design, test results, the proposed approach limits, and efficiency.
Dipole magnet
Fermilab
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