Pulsed and ultrastrong magnetic fields

Optimisation of coils for semi-continuous magnetic fields

“…coupled to the mains or a generator; the second is an energy-limited supply, for instance a charged capacitor battery. The latter is used for generating field pulses of short duration in many laboratories [3].…”

“…the fraction of the volume of the coil that is filled by conducting wires; N is the number of windings, pf and Rf are the resistivity and resistance at the end of the pulse. Note that the rise time is independent of N. The first law of thermodynamics gives us for the energy dissipated as heat per volume of the windings: ~Q = cv~T = j2 p& (3) with Cv the heat capacity of the wire material per volume, andj the current density (Cv equals Cv/VM, where Cv is the molar heat capacity, and VM the molar volume).…”

Mathematical modeling in thermomechanics of electroconductive bodies under the action of the pulsed electromagnetic fields with modulation of amplitude

“…The main source of creation of the pulsed EMF in the above-mentioned devices are technical means that operate according to the principle of discharge of a capacitor system onto a solenoid [4][5][6][7][8]. The pulsed EMF can also be created by generators of high-frequency electromagnetic oscillations.…”

“…The pulsed EMF can also be created by generators of high-frequency electromagnetic oscillations. The change in time of such pulsed EMFs has the character of a regime with amplitude modulation [1,3,5]. This class of the pulsed EMF can be widely used in connection with the ability to control the process by choosing the appropriate laws of time variation of the modulating function and the frequency of the carrier signal.…”

Rapid scanning terahertz time-domain magnetospectroscopy with a table-top repetitive pulsed magnet

“…[6][7][8][9][10][11][12][13][14][15] In particular, combining THz-TDS with a pulsed magnet remains to be a significant technical challenge, 9,13,15 while magnetic fields stronger than 45 T can be generated only in pulsed form. 16 The traditional method for measuring a THz timedomain waveform generated using ultrashort laser pulses includes using a pump-probe scheme where one laser beam passes a beam splitter to make two synchronized pulses from one source. One of the pulses, the pump, is used to generate a THz pulse with duration on the order of picoseconds and the other pulse is used to probe the THz electric field at a given time delay after the THz radiation interacts with the sample.…”