Development of Validated Plume Signature Codes at Nontraditional Wavelengths Utilizing Ground Based Simulation Facilities

Physical Sciences Inc. (PSI) proposes to utilize ground-based experimental simulation facilities to obtain critical velocity dependent cross section data necessary to extend and validate MDA/DESHs high altitude plume signature model: SOCRATES-P. This work will enhance the capability of SOCRATES-P to accurately account for plume phenomenology with optical signatures outside the traditional 2.5V5.0 fYm wavelength band. In Phase II, we will use our tunable, hypervelocity O-atom/N2 source (6-12 km/s) referred to as FAST to measure velocity dependent cross sections of hyperthermal reactions of relevant plume species (e.g. H2O, NH3, fuels) with O-atom and N2 beams. The Phase II effort includes an upgrade to the FAST system enabling measurement of the internal energy distribution (rotational-vibrational) of reaction products using laser spectroscopic techniques. The combined data will be used to update and validate reaction rates related to alternative wavelength plume phenomenology in SOCRATES-P. The Phase II program will result in the development of high fidelity, validated plume signature codes encompassing a greater range of plume phenomenology than current tools and will enhance MDAs ability to accurately predict target/interceptor signatures. Phase II will also establish a premier, state-of-the-art test facility that will remain available to MDA to validate future enhancements to SOCRATES-P.