Magnetic Field Design of the Dipole for Super-FRS at FAIR

Cylindrical harmonic analysis of the magnetic field in the aperture of the superconducting winding of an electromagnet

“…To calculate the magnetic field in the central cross section of the electromagnet, 2D models of magnetic induction are used [7], assuming rectilinear sections of the current winding to be infinitely long. Such an approximation does not fully allow taking into account the real geometry of the current winding and, therefore, can be used as an estimate and requires subsequent 3D calculation [8].…”

Development of the technique for improving the structure of a magnetic field in the aperture of a quadrupole electromagnet with a superconducting winding

“…A special feature of the search for an optimal structure based only on the results of calculation of magnetic flux density using numerical methods is the need to obtain results for a very large number of the structure's variants with many discretely variable parameters for the yoke and the winding [8]. On the other hand, conducting an experimental testing of the longitudinal distribution of the magnetic flux density coefficients for the created set of the prototypes of an electromagnet is the most expensive variant for optimizing the structure based on the predefined magnetic characteristics.…”

Magneto-optical imaging of superconducting MgB2joints

“…A main reason for this effort is the development of cryogen-free MgB 2 coils for magnetic resonance imaging (MRI) [1][2][3][4][5][6]. Although different designs of MRI systems were considered based on the use of cryocoolers [1], conduction cooling systems [2,5] or solid nitrogen [3,4], all of them benefited from the relatively high critical temperature of MgB 2 and its high performance at a modest price of production. The first MRI models with MgB 2 coils [1,2] did not use superconducting joints, but it became clear that such joints would significantly improve their performance.…”

“…The first MRI models with MgB 2 coils [1,2] did not use superconducting joints, but it became clear that such joints would significantly improve their performance. Since then, several types of superconducting joints for connection of mono-and multifilamentary MgB 2 wires have been developed and tested [2][3][4][5][7][8][9][10].…”

“…This type of joint was successfully adapted for MgB 2 coils working in persistent current mode. A different approach based on a splice assembly, using a capsule containing two exposed filaments surrounded by a Mg + B mixture, was reported in [4,10].…”