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Research and development (R&D) of Generation IV fast reactors relies on novel materials that are resistant to both radiation damage and corrosive environments. The lack of data for most of these novel and advanced materials calls for renewed testing efforts performed in an environment of intense fast neutron flux. Fast neutron fluxes greater than 1014 n/cm2s are required for in-situ radiation damage studies, and fast fluxes greater than 1015 n/cm2s are required for radiation damage studies attempting to reach significant displacements per atom (DPA). These fluxes are conventionally achieved with fast reactors, which are not currently available in the US since the shutdown of the Fast Flux Test Facility (FFTF) and will not become available without major investments from the private and public sector [1]. Instead, it was proposed to develop a hybrid subcritical testbed that can provide a fast reactor like environment to support experimentation and demonstration of novel fuels and materials, without the logistical and regulatory challenges of fast reactors [2]. The objective of this proposed work is to develop a conceptual design of a hybrid fast/thermal spectrum subcritical testbed that is coupled to a superconducting electron linear accelerator (linac) through a lead-bismuth eutectic (LBE) neutron source converter. The targeted flux level is a peak fast neutron flux (neutron energy> 0.1 MeV) over 1015 n/cm2s and a peak annual fast neutron fluence over 2× 1022 n/cm2 within a test chamber that contains at least 100 cm3 of space. The design goals are to minimize the required fuel loading and the electron beam power to drive the subcritical system while …