Hajima, R.

Paper	Title	Page
MOYMA01	Overview of Energy-Recovery Linacs	11
	R. Hajima JAEA/ERL, Ibaraki
	An energy-recovery linac (ERL) is capable of generating an electron beam of high-brightness and high average current. It is, thus, a promising device for future light sources such as next-generation X-ray sources and high-power FELs, and several projects are under way in the world. In this talk, we overview the current status of these projects. Recent studies on beam dynamics issues and development of key components for the ERLs are also presented.
	Slides
TUPMA047	Development of a Photocathode DC Gun at JAEA-ERL	175
	R. Hajima, H. Iijima, R. Nagai, N. Nishimori, T. Nishitani JAEA/ERL, Ibaraki
	An electron gun producing an e-beam with high-brightness and high average-current is a key component to realize a next-generation X-ray light source based on energy-recovery linac (ERL). In JAEA, we are developing a photocathode DC gun for a future ERL light source. The DC gun is operated at 250 kV and 50 mA at maximum, and equipped with a load-lock chamber for cathode preparation. In order to keep small emittance at high current operation, we adopt superlattice semiconductor as a photocathode. In this paper, we present the status of the gun development and future plans towards the ERL test facility to construct in collaboration with KEK.
TUPMA046	Future Light Source based on Energy Recovery Linac in Japan	172
	T. Kasuga, T. Furuya, H. Kawata, Y. Kobayashi, S. Sakanaka, K. Satoh KEK, Ibaraki R. Hajima JAEA/FEL, Ibaraki-ken N. Nakamura ISSP/SRL, Chiba
	After extensive discussions on the future light source of the Photon Factory at High Energy Accelerator Research Organization (KEK), it has been concluded that a 5 GeV energy recovery linac (ERL) should be the most suitable candidate to foster cutting edge experiments and support a large variety of user needs from VUV to X-rays. On the other hand, Japan Atomic Energy Agency (JAEA), which has already built a low energy (17 MeV) ERL, also proposed its own 5-6 GeV ERL as a light source. These two institutes with a participation of the members of the Institute for Solid State Physics (ISSP) of the University of Tokyo agreed to promote an ERL-based next-generation synchrotron light source in Japan. In order to realize a 5 GeV ERL, it is necessary to construct a prototype ERL with an energy of ~200 MeV and develop several critical components such as electron guns and superconducting accelerating structures. We are planning to construct together the prototype ERL at the KEK site. An R&D team for the prototype ERL is going to be organized in collaboration with accelerator scientists from the other facilities, UVSOR and SPring-8.