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1. (WO2018146464) CRYOGENIC MAGNET POWER SUPPLY

Pub. No.:    WO/2018/146464    International Application No.:    PCT/GB2018/050337
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Thu Feb 08 00:59:59 CET 2018
IPC: H01F 6/00
H01F 6/04
H01F 6/06
Applicants: TOKAMAK ENERGY LTD
Inventors: SLADE, Robert
Title: CRYOGENIC MAGNET POWER SUPPLY
Abstract:
There is described a magnet assembly comprising a superconducting coil, a cryogenic system, a DC voltage source, an SMPS, current leads, and a controller. The cryogenic system comprises a cryostat and is configured to maintain the superconducting coil at an operating temperature below the critical temperature of the superconductor. The DC voltage is source located outside the cryostat. The SMPS is located inside the cryostat and configured to supply power from the DC voltage source to the superconducting coil. The SMPS comprises a voltage step-down transformer having a primary and a secondary winding. The current leads connect the DC voltage source to the SMPS. The controller is configured to cause the SMPS to supply a first amount of power to the magnet in order to ramp up the magnet to operating current, and a second amount of power to the magnet during steady state operation of the magnet, wherein the first amount of power is greater than the second amount of power.