Particles fluidized bed receiver/reactor with a beam-down solar concentrating optics: 30-kW th performance test using a big sun-simulator AIP Conference Proceedings 1734, 120004 (2016) Abstract. In 2014, Niigata University and the Institute of Applied Energy developed a point-concentration receiverevaluation system using a silicon carbide (SiC) honeycomb and a three-dimensional simulation method. The system includes several improvements over its forerunner, including the ability to increase/decrease the power-on aperture (POA), air-mass flow-rate (AMF) and the height of the focal surface. This paper will focus on the results of tests using an improved receiver evaluation system, at a focal height of 1600 mm. Maximum outlet air temperature reached as high as 800 K, but exerted no untoward effects on the system. Also, receiver efficiency rated between 45 % and 70 %, according to POA. A numerical, 3D method of analysis was created at the same time, in order to analyze temperature and flowdistribution, in detail. This simulation, based on the dual-cell approach, reproduced the thermal non-equilibrium between the solid and fluid domain of the receiver material. The most interesting feature of this simulation, is that, because it includes upper and lower computational domains, it can be used to analyze the influence of both inward-and outwardflowing receiver materials.