Abstract
Space Solar Power Systems (SSPS) is a promising concept for the large-scale clean energy system in the future. JAXA (Japan Aerospace Exploration Agency) has been making scientific research for the SSPS technologies and associated environmental issues. Microwave power transmission experiment on ground is planned to demonstrate the beaming technology from the orbit to the ground. In the experiment, the microwave beam at kW class is transmitted precisely to the rectenna target 100 m apart from the transmitter. We also plan a laser power transmission experiment using a kW class laser in a range of 500 m. In addition to these demonstration experiments on ground, we are investigating the SSPS demonstration experiment in orbit, which is aimed at verifying the microwave beaming technology in 500 km range and finding the upper limit of microwave power density through the ionosphere.
