Cooperative behavior of the random and correlated pinning in Er123 films with columnar defects

Awaji, Satoshi*; Namba, Masashi*; Watanabe, Kazuo*; Ito, Shun*; Aoyagi, Eiji*; Kai, Hideki*; Mukaida, Masashi*; Okayasu, Satoru

IEEE Transactions on Applied Superconductivity, 21(3), p.3192 - 3195, 2011/06

https://doi.org/10.1109/TASC.2010.2089588

The flux pinning behaviors for the heavy ion irradiated Er123 films are investigated based on the detailed (, , ) properties. The double peaks of curves for //c appear in case of the matching field of 0.3 T along -axis and 1.7 T tilted from -axis. In addition, the peaks on () at = 0 (B//c), which originate from the columnar defects, decrease with increasing magnetic field but increase again near the irreversibility field. We found that the cooperation model of the -axis correlated and random pinning centers can describe the observed double peak behavior of (B) and the angular dependence of related to the correlated pinning.

A Study of environment structure reconstruction from images and 3D visualization to support decommissioning works

Hanari, Toshihide; Kawabata, Kuniaki; Shirasaki, Norihito; Ono, Takahiro; Suzuki, Kenta; Mukaida, Shunji

no journal, , 

no abstracts in English

Development of a robot simulator system for operator proficiency training

Suzuki, Kenta; Mukaida, Shunji; Abe, Fumiaki; Kawabata, Kuniaki

no journal, , 

Development of quick and remote analysis for severe accident reactor, 9-1; Current results and challenges in development of laser in-situ remote analysis for nuclear fuel debris in decommissioning of Fukushima Daiichi Nuclear Power Station-2

Wakaida, Ikuo; Oba, Hironori; Akaoka, Katsuaki; Karino, Takahiro; Sakamoto, Kan*; Nakanishi, Ryuzo*; Kashiwakura, Shunsuke*; Taira, Takunori*; Ikeda, Yuji*; Deguchi, Yoshihiro*

no journal, , 

We are developing remote in-situ analysis by laser induced breakdown spectroscopy (LIBS) for simple in-situ screening analysis of fuel debris in the decommissioning of the Fukushima Daiichi Nuclear Power Station. For various application scenarios, microchip laser based LIBS for ultra-long distance analysis, microwave assisted LIBS for signal enhancement, and long/short double pulse laser LIBS for water-containing samples are developing as the fiber-optic LIBS system. To have the reliability, valuation with nuclear fuel materials and spent fuel, and radiation resistance test by Co irradiation will be planed. As a challenging trial, a development of Machine learning technique has introduced for automatically analysis of LIBS spectra.