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A superconducting Compact Energy Recovery Linac (cERL) for electrons was constructed in 2013 at KEK to demonstrate energy recovery concept with low emittance, high-current CW beams of more than 10 mA for future multi-GeV ERL. Recently this cERL was operated not only to demonstrate energy recovery linac high current beam operation but also to promote and conduct a variety of industrial applications such as FEL, THz operation and Rare Isotope Production and irradiation for some materials. In this talk, I will present the status of the studies to realize the stable high-current low emittance CW beam and some applications with this beam., Proceedings of the 20th International Conference on RF Superconductivity, SRF2021, East Lansing, MI, USA

The compact Energy Recovery Linac (cERL) has been in operation at KEK since 2013 to demonstrate ERL performance and develop ERL technology. Recently KEK has launched an infrared FEL project with a competitive funding. The purpose of this project is to build a mid-infrared FEL at the cERL, and to use that FEL as a light source for construction of the processing database required for industrial lasers. The FEL system is composed of two 3-m undulators and a matching section between them, and generates light with a maximum pulse energy of 0.1 micro-J at the wavelength of 20 microns with an 81.25 MHz repetition rate. The FEL is also expected to become a proof-of-concept machine for ERL base FELs for future EUV lithography., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil

We are developing an X-band linac system for monochromatic X-rays source. The monochromatic X-ray is obtained by Compton scattering. Our system has an X-band (11.424 GHz) 3.5-cell thermionic cathode RF gun, traversing wave accelerating tube and a Q-switch Nd:YAG laser with a wavelength of 532 nm. We adopt a laser pulse circulation system. The RF gun can generate multi-bunch electron beam. We aim to generate 1 μs maximum energy electron beam and collide it to circulated laser pulse. I will present a current status of beam measurement of this linac., Proceedings of the 1st International Particle Accelerator Conference, IPAC2010, Kyoto, Japan

Compton scattering hard X-ray source which consists of an X-band (11.424 GHz) electron linear accelerator (linac) and YAG laser is under construction at Nuclear Professional School, the University of Tokyo (UTNS). Monochromatic hard X-rays are required for variety of medical and biological applications. Main advantage of our scheme is to produce monochromatic tunable hard (10-40 keV) X-rays with the intensities of 108-109 photons/sec. In addition, X-ray energy can be changed with rapidly by 40 msec by introducing two different wavelength lasers (YAG fundamental (1064 nm), 2nd harmonic (532 nm)) and optical switch. This quick energy change is indispensable to living specimens and very difficult by a large SR light source and others. Dual-energy X-ray CT and subtraction X-ray CT are available to determine 3D distribution of atomic number density and electron density, and specified atomic distribution, respectively. Here, the construction status of the X-band beam line and the application plan of the hard X-ray will be reported., NanoBeam2005

Compact hard X-ray source using the X-band linear accelerator to which is developed in Nuclear Engineering Research Laboratory the University of Tokyo makes beam size 100micrometer pulse laser and an electronic beam collide, and generates X-rays by Compton scattering. In order to collide a laser electronic beam efficiently, the beam profile monitor that can measure a beam profile with sufficient accuracy is indispensable. As a beam profile monitor which has resolution between the altitude which can measure 100 micro meters, it is focused on Wire scanner, OTR(Optical Transition Radiation) monitor and Screen monitor(alumina ceramics), and the research and development are done. Moreover, since it has the angular distribution decided by the energy of electron beam also besides measuring a beam profile. The angular distribution of optical transition radiation is asking for the electron beam dispersion angle and beam size in the beam waist simultaneously, it can expect measuring beam emittance. The measurement comparison with the QUAD scan method shows the emittance measurement possibility. If this measurement method is success the emittance measurement is done only 1 shot measurement. Supposing the X-band linear accelerator, some verification experiments are performed with S-band linear accelerator (E=20MeV) in this institution. From last experiment, we have observed the blots of Screen monitor about 75 micro meters. From the thickness of the screen was 100 micro meters, we can determine the blots of the screen monitor are depend on the thickness of screen. So the screen monitor cannot measure the beam size less than 100 micro meters. Measuring the beam profile using these three (OTR, Wire Scanner, Screen monitor) beam profile monitors repeatedly, we have achieved the resolution within statistically 10 micrometers. From the experiment of the OTR angular distribution measurement, we have achieved to measure the electron beam energy within the resolution 1MeV and the beam emittance was measured about 20 [pi mm mrad], this result shows the agreement with the result from QUAD scan method. In this poster presentation, we report the result of the verification experiments., Korea-Japan Seminar on Advanced Utilization of Particle Accelerator

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