Equation of state experiments in extreme magnetic fields
- Douglas G.
- James H.
- Hain
- Paulo A.
- Darcie
- Dennis B.
Transient magnetic fields in excess of {approx}500 T, with sub-microsecond risetimes, may be used to isentropically compress materials to megabar pressures, opening the way to some fascinating high pressure physics experiments. Isentropic compression experiments (ICE) have been reported by Asay and others, who used a fast, high voltage capacitor bank to provide the necessary current drive. We have adapted our high explosive pulsed power (HEPP) methods to perform the same experiments with a simple and compact HEPP apparatus. In recent experiments we have successfully obtained accurate isentropic equation of state (EOS) data in the Mbar range (i.e., >100 GPa) with our HEPP system. To that end, ICE requires relatively fast risetimes (>10 TA/s in 1.27-cm wide loads over {approx}500 ns) for HEPP in the loads of interest. It has been a significant challenge to develop the necessary explosive opening and closing switches, which can operate with a few tens of ns precision, to obtain these current risetimes. We will close by describing the EOS data analysis, which is particularly interesting because of the ramp-like nature of the compression waves in ICE experiments.
- Research Organization:
- Los Alamos National Laboratory
- Sponsoring Organization:
- DOE
- OSTI ID:
- 977758
- Report Number(s):
- LA-UR-04-4813
- Country of Publication:
- United States
- Language:
- English
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Isentropic compression of metals, at multi-megabar pressures, using high explosive pulsed power