Full Title Application of Electrical Current Pulses with a Magnitude of up to 10 MA for the Investigation of Phase Transitions Under High Pressure (up to 20 GPa) Tech Area / Field

• NNE-MEC: Non-Nuclear Energy / Miscellaneous Energy Conversion
• MAT-SYN: Materials / Materials Synthesis and Processing
• OTH-ELE: Other / Electrotechnology

Brief Description of Technology
The pressure pulse (up to 20 GPa) is created by passage of an electrical current pulse (with a magnitude of up to 10 MA) trough a metallic cylindrical liner, inside of which the sample under investigation (graphite, tungsten etc.) is placed.

A method for the study of the thermodynamic properties and phase transitions under high pressures and temperatures (up to 10 000 K) is being developed.

Compared to the methods of shock-loading, which require explosive substances, the offered method has several essential advantages, the most important of which are:
- long duration of the pressure pulse (40-100 micro sec, compared to 0.1-1 micro sec in the case of shock-loading), providing quasistatic loading conditions;
- opportunity to perform the investigations under laboratory conditions without the use of explosive substances.

Legal Aspects
Patent application for the method of production of artificial diamond powders has been approved in Russia.

Special Facilities in Use and Their Specifications
The high-pressure pulses are created by means of the following unique equipment, which is created by the Institute of Problems of Electrophysics of the RAS:
- an E7-25 type capacitive energy storeage device (the device was tested up to an electrical current magnitude of 10 MA and current integrals of up to 5´10⁹ A²/s; these two parameters demonstrate the unique ability of the E7-25 storage device);
- an experimental facility for the dynamic compression of substances.

Scientific Papers
A.V. Bushman, V.S. Vorob'ev, A.D. Rakhel and V.E. Fortov. On the possibility of electrical explosion synthesis of artificial diamonds. Doklady Akademii Nauk USSR, Vol. 315, No 5, pp.1124-1127 (1990).

P.Yu. Emelin, Ph. G. Rutberg, B.E. Fridman. E7-25 capacitor energy storage device. IET, Plenum Publishing Co., 36, 1993, N 5, p. 730 - 733.

P.Yu. Emelin, B.E. Fridman, Ph.G. Rutberg. Capacity energy storage of the E7-25 type. Proceedings of the 9-th IEEE International Pulsed Power Conference. Albuquerque, New-Mexico, USA, 21 - 23 June 1993, p. 575 - 578.

B.E. Fridman, Ph.G. Rutberg. On the application of high-pulse currents in experiments on the dynamic compression of solid bodies. Journal of Technical Physics, 1996, N 2 (in Russian).

B.E. Fridman, Ph.G. Rutberg. On the possibility of high-pulse current application in experiments on the dynamic compression of solid bodies. Digest of Technical Papers, X. IEEE International Pulsed Power Conference. Albuquerque, New Mexico, USA, July 3 - 6, 1995.

B.E. Fridman, Ph.G. Rutberg. On the creation of high pressure by a 10 MA and over 60 mcs long pulse current for the study of phase conversion of substances. Abstract book of the MG-7 conference.

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