Title :
Design of a HTS Solenoid for a Gyrotron Magnet Upgrade
Author :
Sanz, S. ; Abramian, P. ; Calero, J. ; Fernández, A. ; García-Tabarés, L. ; Gutierrez, J.L. ; Lucas, J. ; Rodríguez, E. ; Rodríguez, I. ; Toral, F. ; Vázquez, C.
Author_Institution :
CIEMAT, Madrid
fDate :
6/1/2007 12:00:00 AM
Abstract :
The design of a HTS cryogen-free solenoid for a gyrotron magnet upgrade is presented. This gyrotron is used to set up and warm the plasma in an experimental fusion device at Ciemat. The solenoid will be wound with BISCCO-2223 tapes. A two stage Gifford-McMahon cryocooler was used to cool down the magnet. A significant operation cost will be saved as the present solenoid is a Nb-Ti magnet cooled down in a helium bath supplied with mobile tanks. The main requirement of the magnet is to reproduce the original magnetic profile in the axis of the solenoid with a peak of 2 T in a 150 mm diameter warm bore. The magnet consists of several stacked double-pancake coils. The outer radii, the axial positions and the number of windings have been optimized by means of a genetic algorithm. Afterwards, the cryostat design is also described, including the heat leakage calculation. Finally, the winding techniques and the results of the tests of a prototype coil are also reported in this paper.
Keywords :
genetic algorithms; gyrotrons; helium; superconducting cables; superconducting magnets; winding (process); BISCCO-2223 tapes; Gifford-McMahon cryocooler; HTS cryogen-free solenoid; coil winding; fusion device; genetic algorithm; gyrotron magnet upgrade; helium bath; size 150 mm; Boring; Coils; Costs; Genetic algorithms; Gyrotrons; Helium; High temperature superconductors; Plasma devices; Solenoids; Wounds; Bismuth compounds; cryogenics; genetic algorithms; gyrotrons; high-temperature superconductors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.899245
