  Considering the type IIB superstring in a pp wave background some recent
ideas and perspectives of Thermo Field Dynamics on string theory are presented.
The thermal Fock space is constructed attempting to consider a possible finite
temperature version of the BMN correspondence in this framework. Also, the
thermal vacuum is identified as a string boundary state realizing the thermal
torus interpretation in the ambit of Thermo Field Dynamics. Such a
interpretation consists of a generalization of some recent analysis for the
closed bosonic string.
