Introduction to development of advanced safeguards and security NDA technologies by JAEA-ISCN

Seya, Michio; Kureta, Masatoshi; Soyama, Kazuhiko; Nakamura, Hironobu; Harada, Hideo; Hajima, Ryoichi

Proceedings of INMM 55th Annual Meeting (Internet), 10 Pages, 2014/07

JAEA has been implementing development programs of basic technologies of the following advanced NDA (non-destructive assay) of nuclear material (NM) for nuclear safeguards and security. (1) Alternative to He neutron detection using ZnS/BO ceramic scintillator, (2) NRD (neutron resonance densitometry) using NRTA (neutron resonance transmission analysis) and NRCA (neutron resonance capture analysis), (3) NRF (nuclear resonance fluorescence)-NDA using laser Compton scattered (LCS) -rays (intense mono-energetic -rays). The development program (1) is for NDA systems that use ZnS/BO ceramic scintillator as alternative neutron detector to He for coming shortage of its supply. The program (2) is for a NDA system of isotopic composition measurement (non-destructive mass spectroscopy) in targets such as particle-like melted fuel debris using NRTA and NRCA. The program (3) is for NDA systems using a specific NRF reaction of certain Pu/U isotope caused by mono-energetic LCS -ray with energy tuned to the specific excited state of the isotope. This paper introduces above three programs.

Preliminary measurements on single and multi-crystal diamond electron cathodes

Minehara, Eisuke

Proceedings of 2nd Annual Meeting of Particle Accelerator Society of Japan and 30th Linear Accelerator Meeting in Japan, p.55 - 56, 2005/07

The next generation high brightness and high current electron source like a photo cathode, a thermionic cathode, a crystal Diamond electron cathode and others would be expected to realize the next generation ERL (energy recovery linac) based light source and SASE X-ray free-electron laser. The JAERI FEL group has recently started to develop a new crystal Diamond electron cathode technology for high current, high brightness, and long life electron source. In the presentation, we plan to explain and to discuss our strategy and a preliminary experimental measurements of the crystal Diamond cathode, and related Diamond cathode evaluation system.

Large-scaled non-thermal laser peeling, cutting and drilling in nuclear decommissioning industry

Minehara, Eisuke; Hajima, Ryoichi; Sawamura, Masaru; Nagai, Ryoji; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Iijima, Hokuto; Nishitani, Tomohiro; Kimura, Hideaki*; Oguri, Daiichiro*; et al.

Proceedings of 13th International Conference on Nuclear Engineering (ICONE-13) (CD-ROM), 10 Pages, 2005/05

The JAERI FEL has recently discovered the new FEL lasing of 255fs ultra fast pulse, 6-9% high-efficiency, one gigawatt high peak power, a few kilowatts average power, and wide tunability of medium and far infrared wavelength regions at the same time. Using the new lasing and energy-recovery linac technology, we could extend a more powerful and more efficient free-electron laser (FEL) than 10kW and 25%, respectively, for nuclear industry, pharmacy, medical, defense, shipbuilding, semiconductor industry, chemical industries, environmental sciences, space-debris, power beaming and so on. In order to realize such a tunable, highly-efficient, high average power, high peak power and ultra-short pulse FEL, we need the efficient and powerful FEL driven by the JAERI compact, stand-alone and zero boil-off super-conducting RF linac with an energy-recovery geometry. Our discussions on the FEL will cover the application of non-thermal peeling, cutting, and drilling to decommission the nuclear power plants, and to prevent stress-corrosion cracking in nuclear industry and roadmap for the industrial FELs, the JAERI compact, stand-alone and zero-boil-off cryostat concept and operational experience, the new, highly-efficient, high-power, and ultra fast pulse lasing mode, and the energy-recovery geometry.

A First-order matrix approach to the analysis of electron beam emittance growth caused by coherent synchrotron radiation

Hajima, Ryoichi

Japanese Journal of Applied Physics, Part 2, 42(8A), p.L974 - L976, 2003/08

https://doi.org/10.1143/JJAP.42.L974

A first-order transform matrix is proposed to calculate electron beam emittance dilution arising from coherent synchrotron radiation (CSR) in a next-generation light source based on an energy-recovery linac. The matrix approach enable us to scan a lot of parameters for the design of achromatic cells of minimum emittance dilution. The emitatce dilution can be minimized when the CSR wake dispersion matches to the betatron function envelope at the achromatic cell exit.

Doubling of the microbunch repetition rate of a thermionic electron gun in JAERI-FEL

Nishimori, Nobuyuki; Nagai, Ryoji; Minehara, Eisuke; Kikuzawa, Nobuhiro; Hajima, Ryoichi; Sawamura, Masaru

Proceedings of 28th Linear Accelerator Meeting in Japan, p.159 - 161, 2003/00

no abstracts in English

Commissioning of JAERI energy recovery linac

Nishimori, Nobuyuki; Hajima, Ryoichi; Nagai, Ryoji; Sawamura, Masaru; Kikuzawa, Nobuhiro; Shizuma, Toshiyuki; Minehara, Eisuke

Proceedings of 8th European Particle Accelerator Conference (EPAC 2002), p.822 - 824, 2002/00

The energy recovery linac with superconducting accelerator was constructed in JAERI (Japan Atomic Energy Research Institute) FEL, and the commissioning started in December 2001. The electron beam is injected into the energy recovery system at 2 MeV, accelerated up to 17 MeV and damped after deceleration down to 2 MeV by the same accelerator. The bunch charge of the electron beam is 0.5 nC with micro-pulse repetition rate of 10 MHz. The energy recovery rate was estimated to be more than 95 % from an RF input power with and without energy recovery. In this paper, we show the present results of energy-recovery experiments.

The JAERI free-electron laser driven by a superconducting rf Linac towards ultra-short pulse, highly-efficient, high power, and tunable coherent light sources

Minehara, Eisuke

Hoshako, 14(3), p.182 - 189, 2001/06

http://ci.nii.ac.jp/naid/10006083022

We would like to explain reccent developments and future plans of the JAERI(Japan Atomic Energy Research Institute) free-electron lasers driven by a superconducting rf linac with an energy recovery loop. In the beginning of February 2000, we could exceed our 1-kW design goal and finally reach 2.34kW in quasi-continuous wave(CW) operation with a very high extraction efficiency of 5 percent or more. The high power and highly-efficient lasing has recently been found to be a novel one, a few cycle lasing of 250fs, and about 1 GW peak at the perfect synchronism without lethargy.

Production of a high proton yield beam in a semi-cylindrical plasma generator

Watanabe, Kazuhiro; Araki, Masanori; Dairaku, Masayuki; Horiike, Hiroshi; Ohara, Yoshihiro; Okumura, Yoshikazu; Tanaka, Shigeru; ; Pamela, J.*

JAERI-M 90-212, 56 Pages, 1990/12

JAERI-M-90-212.pdf:1.81MB

no abstracts in English

ERL based Laser-Compton sources and applications

Hajima, Ryoichi; Seya, Michio

no journal, , 

The QST and the JAEA are proposing an ERL (energy recovery linac) -based Compton source to produce high flux photons (1013 ph/s) in MeV region with energy tenability for non-destructive assay (NDA) of all nuclides (including nuclear materials (NM)) utilizing nuclear resonant fluorescence (NRF). We can apply the proposed NDA system to nuclear security and nuclear safeguards for analyzing NM in severe conditions such as under very high radiation background or in deep inside material. For these applications we have studied NDA of isotopes in transmission geometry for measurement of NM inside a thick wall canister and in scattering geometry for measurement of NMs of spent fuel in water or detection of NM in a heavy shield. We present our efforts on these.