Shock temperature measurements of pre-compressed water using two-color streaked optical pyrometer*

A coupling method of static pre-compression and laser-shock compression has been used to investigate off-Hugoniot states such as internal conditions of planets. This method has a possibility to generate lower temperature conditions than principal Hugoniot. In this work, shock temperature of a pre-compressed water has been experimentally obtained. We measured two-color emission from a shock wave driven into the pre-compressed water target using a streaked optical pyrometer. Using this method, it is possible to directly determine the shock temperature without any assumption of the emissivity of the shocked matter.