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Lysenko V.,RTI Cryomagnetic Systems
IEEE Transactions on Applied Superconductivity | Year: 2012

A numerical study was performed on homogeneous field synthesis problem. The influence of geometrical constraints on the important characteristics of uniform field solenoids was studied. These characteristics are: complexity of the shape of current distribution, peak field strength in windings, and relative cost of the solenoid. For superconducting magnets, minimization of the peak field is considered to be one of the primary goals of optimization. An algorithm based on linear programming was proposed to calculate the optimal coil arrangements with minimal peak field. These results were compared to ones obtained by another method, a regularization technique for the field error least squares problem. © 2002-2011 IEEE. Source


Demikhov E.,RTI Cryomagnetic Systems | Kostrov E.,RTI Cryomagnetic Systems | Lysenko V.,RTI Cryomagnetic Systems | Piskunov N.,RTI Cryomagnetic Systems | Troitskiy V.,Russian Academy of Sciences
IEEE Transactions on Applied Superconductivity | Year: 2010

The paper presents design and test results for a conduction cooled 8 T superconducting magnetic system with a variable temperature insert for electrical measurements. The system is based on one Pulse Tube cryocooler. The helium gas gap heat switch is used as controllable thermal link between variable temperature chamber and the 4 K stage to avoid overheating of the magnet at high temperatures of the insert. The superconducting magnet is manufactured from NbTi wire and impregnated with epoxy resin by "wet" technology. The clear diameter of variable temperature chamber is 20 mm. The system provides sample temperature range of 5.4-300 K. The maximum operating magnetic field depends on the temperature of the insert and belongs to the range of 7.1-8.2 T. The cool down time of the magnet from room temperature to 3.6 K is 6 hours. © 2006 IEEE. Source


Demikhov T.,RTI Cryomagnetic Systems | Kostrov E.,RTI Cryomagnetic Systems | Lysenko V.,RTI Cryomagnetic Systems | Demikhov E.,Russian Academy of Sciences | Piskunov N.,RTI Cryomagnetic Systems
IEEE Transactions on Applied Superconductivity | Year: 2012

A 9 T conduction cooled superconducting magnet with 50 mm room temperature chamber is developed and tested. The system design allows to fill the chamber with liquid nitrogen. The system is based on a commercial two-stage 4 K Gifford-McMahon cryocooler with cooling power of 1.5 W at 4.2 K. The cool down time of the magnet from room temperature to 3.5 K is 18 hours. A pair of coated conductor based current leads is employed to reduce heat leak to the magnet. The main purpose of the magnet is critical current measurements for HTS wires. Using the magnetic system the angular dependence for short sample of coated conductor (SCS4050 from Superpower) and critical current of a small layer wound coil made of the same conductor were measured at 77 K in external magnetic field up to 4 T. The n-values for short sample are also presented. The measured critical current of the HTS coil in external magnetic field is up to 1.5 times lower than calculated one. © 2011 IEEE. Source


Demikhov E.,RTI Cryomagnetic Systems | Kostrov E.,Russian Academy of Sciences | Lysenko V.,Russian Academy of Sciences | Piskunov N.,RTI Cryomagnetic Systems | Troitskiy V.,Russian Academy of Sciences
Journal of Physics: Conference Series | Year: 2010

A conduction cooled 8 T superconducting magnetic system with variable temperature insert is developed and tested. The cryomagnetic system is based on a commercial two-stage pulse tube cryocooler with cooling power of 1W at 4.2 K. The compact superconducting magnet is manufactured from NbTi wire and impregnated with epoxy resin by "wet" technology. The clear diameter of variable temperature space is 20 mm. The system provides temperature range of 5.5-300 K. The variable temperature space is filled by low pressure helium gas. To eliminate the overheating of the magnet at high temperatures the heat switch is used in thermal coupling between variable temperature space and the 4K stage. The system design, manufacturing and test results are presented. © 2010 IOP Publishing Ltd. Source

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