Removal of co-deposited layers by excimer lasers

Shu, Wataru; Kawakubo, Yukio*; Luo, G.; Nishi, Masataka

Journal of Nuclear Science and Technology, 40(12), p.1019 - 1026, 2003/12

https://doi.org/10.3327/jnst.40.1019

Recovery of tritium from co-deposited layers is a crucial issue for fusion machines that use carbon as plasma facing materials. In this study, the removal rate of the JT-60 and TFTR co-deposited layers by KrF laser was measured for varying laser energy density. The removal rate of 5.0 m/pulse was achieved for the JT-60 co-deposited layers at the energy density of 11 J/cm for KrF excimer laser. Hydrogen (tritium) was released in the form of hydrogen molecules and readily recovered. The formation of cones due to local surface melting was observed at the KrF laser energy density of 0.8 J/cm, whereas strong melting was determined to be the mechanism of the ablative removal of the JT-60 co-deposited layers at the energy density greater than the ablation threshold.

Patterning of SnO thin films by combination of lithographic photoirradiation and pyrolysis of an organotin polymer

*; Ichinose, Yuji; Kawanishi, Shunichi; Nishii, Masanobu; Sasuga, Tsuneo; *; *

Chemistry of Materials, 9(12), p.2674 - 2675, 1997/00

https://doi.org/10.1021/cm970276e

no abstracts in English

Photochemical introduction of superacidic sites on fluoropolymer surfaces

Ichinose, Yuji; Kawanishi, Shunichi

Langmuir, 13(22), p.5805 - 5807, 1997/00

https://doi.org/10.1021/la962045c

no abstracts in English

The Possibility of photochemical reaction processing using the excimer laser, I: Laser-induced organic synthesis

Suzuki, Nobutake; Shimizu, Yuichi

Hoshasen Kagaku, 39(8), p.291 - 297, 1996/00

no abstracts in English

Excimer laser-induced surface reaction of fluoropolymers with liquid water

Ichinose, Yuji; Kawanishi, Shunichi

Macromolecules, 29, p.4155 - 4157, 1996/00

https://doi.org/10.1021/ma946441i

no abstracts in English

Annual report of the Osaka Laboratory for Radiation Chemistry, Japan Atomic Energy Research Institute, No.27; April 1, 1993-March 31, 1994

JAERI-Review 95-002, 62 Pages, 1995/03

JAERI-Review-95-002.pdf:1.81MB

no abstracts in English

Development of laser decontamination; Research and fundamental experiment

Fukui, Yasutaka; ; Tanimoto, Kenichi; Terunuma, Seiichi

PNC TN9410 95-041, 171 Pages, 1994/12

PNC-TN9410-95-041.pdf:11.32MB

As the material is irradiated by laser beam, its surface is instataneously heated and ablation. the contaminant in surface layer of radioactive wastes will be decontaminated, provided that such the physical phenomenon is used of decontamination technique. The applicability with decommissioning of laser decontamination technique are investigated by the research of the associated laser techniques and the removing test with metal surface. The results of the research and the test is as follows. (1)The research of laser decontamination. On the YAG and the eximer laser beam, there were some study reports of the decontamination, with the metal and the concrete. The structural material. the biological shield, and the waste strage vessel, these objects were regarded as the objects of the laser decontamination. (2)The removing test of the metal surfacc by lascr beam. The removing performance was examined by irradiating line forcused YAG laser beam with the stainless steel surface. The average removal depth rose, in proportion the product of the energy beam density and the number of beam pulse in He atomosphere. The removal depth was obtained more than 1m, in condition of the laser beam energy was 400mJ and the moving velocity of the test piece was 0.25mm/sec. About 65% of the ablation products were collected, by the simple absorbing system of the open type. (3)Future plan. It is necessary, Examining the removing performance and the variable property of the removal surface, investigating the decontamination technique of the large area and the collecting technique of the ablation products, and so. Thereafter the application to the decontamination will be studied.

Application of excimer lasers to organic chemical reactions

Shimizu, Yuichi

Radioisotopes, 43(3), p.147 - 156, 1994/03

https://doi.org/10.3769/radioisotopes.43.147

no abstracts in English

Endowment with the wettability on the surface of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer by excimer laser irradiation

*; *; Shimizu, Yuichi; Sugimoto, Shunichi*; Nishii, Masanobu; Kawanishi, Shunichi

Chemistry Letters, 1993, p.1637 - 1638, 1993/00

no abstracts in English

None

; *

PNC TJ8627 92-001, 257 Pages, 1992/03

PNC-TJ8627-92-001.pdf:8.09MB

no abstracts in English