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Pulsed Opening Switch

#1109


Development of New Type of Pulsed High-Current Open Switch

Tech Area / Field

  • PHY-SSP/Solid State Physics/Physics

Status
8 Project completed

Registration date
02.09.1997

Completion date
26.05.2003

Senior Project Manager
Lapidus O V

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • Kurchatov Research Center / Institute for Molecular Physics, Russia, Moscow

Collaborators

  • Los-Alamos National Laboratory, USA, NM, Los-Alamos\nFlorida State University, USA, FL, Tallahassee

Project summary

Goals of the project:

Development of pulsed opening switch of new type.

To do this we should carry out the following:


- A development of measurement techniques for magnetic and transport properties of condensed matter in pulsed high magnetic field.
- An experimental investigation of metal-insulator phase transition in solid solutions based on vanadium oxides under high magnetic field (critical field vs. temperature and impurity concentration).
- A development of chemical technologies for fabrication of vanadium oxide details
- A demonstration of normal operation of a full-scale model of the opening switch.

Technical Approach and Methodology

A thermostat for the pulsed solenoid, heating system and temperature control system will be designed and manufactured. To avoid oxidizing, heating of the samples is supposed to be carried out by flow of warm inert gas. Normal operation of the thermostat will to be tested. Namely, heating rate, limiting temperature, precision of temperature control will be checked.

Development of techniques of magnetic susceptibility and contactless conductivity measurements in pulsed magnetic field comprise fabrication of models systems of susceptibility step and conductivity measurement similar to technique used previously for highly conductive materials. Adjustment of the techniques will be performed on temperature transitions metal-insulator in vanadium sesquioxide. Then all measurement system will be produced.

A chemical technology should be chosen to manufacture compact samples and bulk details with doping impurities. The technology will be optimized on small quantity of substance. Protective coatings on the details and samples can be used to prevent oxidizing. Analyses of stoichiometry, homogeneity of doping impurity distribution, oxygen valence and x-ray analyses are supposed to performed.

The thennostat, measurement system and samples will to be transported from RFNC-VNIIEF to IAE where they will mounted on pulsed nondestructive magnet (55 T). The thennostat and temperature control system will be checked, the measurement system will be connected with the recording system of IAE. Then, approximately 15 pulses with pick field of 50 Т and 30 pulses with pick field 30 T, which will be used to measure conductivity and susceptibility step of the samples, will be done. Then, all the equipment will be dismounted and transported back to RFNC-VNIIEF.

On the base of experimental data, temperature dependencies of the critical magnetic field will be built at different doping concentrations. These curves will be compared with theoretical ones. The pergence between the theoretical and experimental data will enable to revise parameters of the theoretical model. According to these results a full-scaled model of opening switch of megaampere range and of switching time of microsecond range will be designed and developed. An explosive flux compression generator of MC-2 is supposed to be used. To determine limiting switching rate, a load with low inductance and low resistance assumed to be used. Experiments with the model will be carried out in the inner polygon of RFNC-VNIIEF. Various operational regimes will be investigated.

Participation of foreign collaborators

(1) Prof. James Brooks (US, Florida State University) is a consultant on material science and participates in discussions of results of the work, (2) Dr. Wilfred Lewis (US, LANL) is a consultant on pulsed power devices and discusses feasible pulsed power applications.


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