Experimental verification of velocity bunching via shot-by-shot measurement at S-band photoinjector and linac

Iijima, Hokuto; Uesaka, Mitsuru*; Sakamoto, Fumito*; Ueda, Toru*; Kumagai, Noritaka*; Serafini, L.*

Japanese Journal of Applied Physics, Part 1, 44(7A), p.5249 - 5253, 2005/01

https://doi.org/10.1143/JJAP.44.5249

We represent an experimental verification of a bunch compression method named "velocity bunching". The velocity bunching based on the rectilinear compression uses a traveling wave accelerating tube as a compressor. The experiment was performed by an S-band photoinjector and a linac at Nuclear Engineering Research Laboratory, University of Tokyo. The shot-by-shot bunch length was measured to be 0.5 0.1 ps (rms) in average by the femtosecond streak camera for a bunch charge of 1 nC. The experimental result is in good agreement with PARMELA simulations.

ETDOSE; A Code to simulate tritium transfer in the environment and to evaluate dose

Atarashi-Andoh, Mariko; Amano, Hikaru; Takahashi, Tomoyuki*

Fusion Science and Technology, 41(3), p.470 - 473, 2002/05

During normal operation or an accident of nuclear facilities, tritium will be released mostly as forms of HT and HTO to the environment. ETDOSE is a simple computer code to calculate atmospheric distribution patterns of tritium for an acute and a chronic release of HT and HTO. This code calculates tritium concentrations in air, soil, plant free water and OBT, and estimates dose impact by inhalation of air and ingestion of food. ETDOSE has GUI interface, so anyone can use it very easily. Participation in IAEA's model validation program BIOMASS has been done using this code for BIOMASS Scenario 1. In the scenario, tritium is assumed to be released continuously to the atmosphere as forms of HT or HTO. We shows the outline of ETDOSE and results of the application.

Compact X-ray sources by intense laser interactions with beams and plasmas

Kotaki, Hideyuki; Kando, Masaki; Dewa, Hidenori; Kondo, Shuji; Watanabe, Takahiro*; Ueda, Toru*; Kinoshita, Kenichi*; Yoshii, Koji*; Uesaka, Mitsuru*; Nakajima, Kazuhisa

Lasers Plasma Generation and Diagnostics (Proceedings of SPIE Vol.3935), p.149 - 155, 2000/01

no abstracts in English

Short pulse X-ray generation via backward Thomson scattering on relativistic electron beam

Kotaki, Hideyuki; Nakajima, Kazuhisa*; Kando, Masaki*; Dewa, Hidenori*; Kondo, Shuji; ; Watanabe, Takahiro*; Ueda, Toru*; Nakanishi, Hiroshi*; Yoshii, Koji*; et al.

Inst. Phys. Conf. Ser., (159), p.565 - 567, 1999/00

no abstracts in English

Tritium behavior in fusion reactor facilities and the environment, 6; Tritium behavior in the environment, 6.4, Tritium release experiment in the environment, 6.4.1.2, Formation of organically bound tritium in plants

Amano, Hikaru

Purazuma, Kaku Yugo Gakkai-Shi, 73(12), p.1351 - 1352, 1997/12

https://ci.nii.ac.jp/naid/110003826819

no abstracts in English

Variation of HTO concentration in air

Noguchi, Hiroshi

Purazuma, Kaku Yugo Gakkai-Shi, 73(12), p.1350 - 1351, 1997/12

https://ci.nii.ac.jp/naid/110003826819

no abstracts in English

Diffusion Behaviour of Nuclides Considering Pathways in Fractured Crystalline Rocks

Sato, Haruo; ; ; ; ; Yui, Mikazu

PNC TN8410 97-127, 57 Pages, 1997/08

PNC-TN8410-97-127.pdf:1.51MB

Retardation of key nuclides is one of the most important mechanisms to be examined specifically and modelled for the performance assessment of geological disposal of radioactive waste. We have been studing diffusion of nuclides into the pore spaces of the rock matrix, sorption of nuclides on the rock pore surfaces and pore properties to quantify the degree of nuclide retardation in fractured crystalline rock. The work has concentrated on predominant water conducting fracture system in the host granodiorite in the Kamaishi In Situ Test Site, which consists of fracture fillings and altered granodiorite. Through-diffusion experiements to obtain effective and apparent diffusion coefficients (Da and De, respectively) for Na, Cs, HTO, Cl and Se as a function of ionic charge at 22 25C and batch sorption experiments for Cs, Sr, Se, U and Pu were conducted on fracture fillings, altered and intact granodiorite. The experiments only for Se, a redox sensitive element, were done in an N2-atmospheric glove box (O 1 ppm) to keep the chemical species. In situ groundwater (pH8.79.5) sampled from the same place as rock samples was used for the experiments. Porosity and density of cach rock sample were determined by both water saturation method and mercury porosimetry, and pore-size distribution and specific surface area of pores were measured by mercury porosimetry. The porosity is in the order; fracture fillings (5.6%) altered rock (3.2%) intact rock (2.3%). The pore-size distribution of the intact and altered granodiorite is ranging from 10 nm to 0.2 mm, and the fracture fillings have that of 50 nm to 0.2 mm, but a lot of pores were found around 100 nm and 0.2 mm in the fracture fillings. The effective diffusion coefficients for all species (Na, Cs, HTO, Cl, Se0) are in the order of fracture fillings altered rock intact rock in proportion to these porosities. Effective diffusion ...

Radiation effects and safety control of Tritium; Migration behavior of tritium in the envrionment, tritium uptake by Plants

Amano, Hikaru; Atarashi, Mariko

Nihon Genshiryoku Gakkai-Shi, 39(11), p.929 - 931, 1997/00

no abstracts in English

Behavior of tritium gas released continuously to the atmosphere

Yokoyama, Sumi; Noguchi, Hiroshi; Fukatani, S.; Kinouchi, Nobuyuki; Murata, Mikio; Amano, Hikaru; Atarashi, Mariko

Int. Symp. on Nuclear Energy and the Environment (96 NEE), 0, p.102 - 104, 1996/00

no abstracts in English

Tritium transfer to plants from atomospheric release of molecular tritium

Atarashi, Mariko; Amano, Hikaru

Eisei Kogaku Shimpojiumu Rombunshu, 0, p.181 - 185, 1995/11

no abstracts in English