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Physical Progress and Research Scenario of Isentropic Compression

Author: ChengKun
Tutor: YuanXiao
School: Huazhong University of Science and Technology
Course: Optical Engineering
Keywords: Dynamic loading technology Isentropic compression Laser driven isentropic compression Entropy Entropy increment
CLC: O414.11
Type: Master's thesis
Year: 2009
Downloads: 21
Quote: 0
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Abstract


The isentropic compression experiments (ICE) is a shockless process where very high pressure conditions can be accessed, and the accompanying temperature rise is much less severe than shock experiments. Without shocking (so as not to heat the sample), ICE need less energy to compress the sample to a given pressure the shock experiments. And an isentropic experiment yields a continuum of points along the isentropic loading path. So, isentropic loading is necessary for achieving cool or moderate dense states of matter, obtaining equation of state (EOS) and efficient performance of inertially confined fusion implosions. The investigation of isentropic compression has great significance in science research, energy, national defense.The research development of isentropic compression at home and abroad is described. Important concepts and basic theories about isentropic compression are introduced. Based on Gruneisen EOS and cohesion material practical EOS, the isentropes of aluminum are calculated, which are in good agree with each other. The isentropic sound speed of solid material is researched, the methods of computing temperature rise and entropy increment are introduced, which are important to predict ideal isentropic loading pressure wave profile and determine the isentropic extent. Research scenario is discussed. The maximum rate of change of pressure with respect to time is confined. According to the ablative pressure scaling relationship, the ideal pulse waveform can be obtained. To achieve isentropic compression requires driven pressure which increases smoothly. And laser direct-drive isentropic compression requires laser pulse with long leading part and high energy. The method of evaluating isentropic extent is also discussed.Also, the description of isentropic compression is discussed in this thesis. In case of no phase transformation and that the pressure waves induced in the material are referred to as simple waves, the entropy increment calculated, based on theory isentrope, is negligible without regard to thermal conduction and suprathermal electron. So, it is reasonable to determine isentropic extent by the free surface velocity history. If the velocity history rises smoothly, the compression process is isentropic.

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CLC: > Mathematical sciences and chemical > Physics > Theoretical Physics > Thermodynamics and Statistical Physics > Thermodynamics > Fundamental laws
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