Magnetic fields up to 37 teslas in a 34 mm bore at room temperature are obtained with coils fabricated using in-house developed copper alloys. The coils are nested in large stainless steel housings.
The housing are connected to the main power supply which delivers up to 25 MW of electric power. The power supply transforms the high voltage alternative current (AC) deliver to the laboratory into a highly stable direct current (DC) that feeds the high field magnets.
As understood by A.M. Ampère two centuries ago, the magnetic field produced by a coil is proportional to the number of turns of the coil and to the intensity of the electric current.
In Grenoble we use a maximum current of 33000 amperes that allows today to reach the highest magnetic field in less than two minutes. This feature is essential for researchers who want to sweep the magnetic field to characterize the properties of a material on the whole range of magnetic field available.
The Grenoble unique river cooling capacities is made available for the high field magnet cooling through a dedicated pumping station shared with the ILL neutron source and the ESRF synchrotron facility.
As a consequence, magnetic field plateaus of several hours are available for researchers when it is required to accumulate experimental data for obtaining high-quality scientific results at a given magnetic field.