**1. Introduction**

The Wakasa Wan Energy Research Center (WERC) opened in November 1998, and from July 2000, an accelerator facility which forms the core of WERC became available. The accelerator facility consists of three accelerators: a synchrotron, a tandem accelerator and an ion-implanter [1,2]. Using these accelerators, we have been involved in research on the destruction of tumor cells in human bodies (proton beam radiotherapy) [3,4], the transmutation of DNAs in plants and bacteria (ion beam breeding) [5–7], ion beam material modification [8–10] and ion beam analysis for materials [11–13]. The accelerators at WERC have also been utilized to simulate the radiation effects on materials which are related to nuclear power plants [14–16] and those of space electronics [17–25]. Electronic systems are severely affected by the radiation environment in space. There are three main irradiation effects on space electronics: the single event effect (SEE), the total ionizing dose effect (TID) and the displacement damage dose effect (DDD) [26–31]. Before the operation of electronic devices in space, these effects from the radiation environment in space have to be evaluated on earth. Recently, the space industry has been widespread; therefore, the radiation tolerance of space electronics has been actively investigated using electron, gamma-ray, and ions. In this report, we describe the specification of each accelerator, beam lines, and irradiation apparatuses at WERC, focusing on the research of the radiation effects for space electronics. Since the three accelerators can cover a wide energy range of ions from 10 keV to 660 MeV, we can simulate the space radiation field well. Finally, several recent research results of the ion irradiation effects on solar cells, LSI circuits, radiation detectors and image sensors are summarized.
