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Abstract
We developed a new neutron mirror made of Diamond-like carbon (DLC). DLC is a film of amorphous carbon that has characteristics of both diamond and graphite. We produced DLC mirrors by ionization deposition method which is one of the chemical vapor deposition (CVD). Generally, DLC made by CVD contents a few tens of percentages of hydrogen. It decreases the Fermi potential of the DLC coating because hydrogen has negative Fermi potential. In order to increase the Fermi potential of the coating, we deuterated the DLC by using deuterated benzene for the source gas. The characteristics of the deuterated DLC(DDLC) coating was evaluated by RBS, ERDA, x-ray reflectivity, AFM. As a result, DDLC coating has 243neV due to deuteration, which is the same level as Ni. The RMS of height of the DDLC was 0.6nm so that the DDLC coating can be applied for a focusing mirror or specular transportation of pulsed neutron. Besides, we also develop Hydrogen/Deuterium DLC multiple layer mirror. So far, 4 layers mirror has been succeeded.
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Details
1 Faculty of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan
2 High Energy Accelerator Research Organization, Tsukuba 305-080, Japan
3 Institute of Physical and Chemical Research, Wako 351-0198, Japan
4 School of Science, The University of Tokyo, Tokyo 113-0033, Japan
5 Department of Physics, Nagoya University, Nagoya 464-8602, Japan; Center of Experimental Studies, Nagoya University, Nagoya 464-8602, Japan
6 International Center for Elementary Particle Physics, The University of Tokyo, Tokyo 113-0033, Japan
7 High Energy Accelerator Research Organization, Tsukuba 305-080, Japan; Deceased
8 School of Science, Ibaraki University, Hitachi 316-8511, Japan
9 Research Center for Advanced Particle Physics, Kyushu University, Fukuoka 812-8581, Japan