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Yashiro, S.,Murai, K.,Okabe, T.,Takeda, N. The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.2
This study proposes two new approaches for identifying damage patterns in a holed CFRP cross-ply laminate using an embedded fiber Bragg grating (FBG) sensor. It was experimentally confirmed that the reflection spectrum from the embedded FBG sensor was significantly deformed as the damage near the hole (i.e. splits, transverse cracks and delamination) extended. The damage patterns were predicted using forward analysis (a damage analysis and an optical analysis) with strain estimation and the proposed damage-identification method as well as the forward analysis only. Forward analysis with strain estimation provided the most accurate damage-pattern estimation and the highest computational efficiency. Furthermore, the proposed damage identification significantly reduced computation time with the equivalent accuracy compared to the conventional identification procedure, by using damage analysis as the initial estimation.
Mirror stabilization experiments in the Hanbit device
England, A.C.,Lee, D.K.,Lee, S.G.,Kwon, M.,Yoon, S.W.,Yasaka, Y.,Sugimoto, N.,Katanuma, I.,Yashiro, K.,Imai, T. International Atomic Energy Agency 2009 Nuclear fusion Vol.49 No.12
<P>The Hanbit magnetic mirror device has been involved in a series of experiments on stabilization of the MHD flute type mode. We undertook investigations to see whether a divertor and the kinetic stabilizer (KS) of Post <I>et al</I> can stabilize the MHD instability. The Hanbit divertor configuration used one of the central cell coils with reversed current as the divertor coil and two other coils with increased current to compensate the field droop. The divertor eliminated the <I>m</I> = −1 instability when the null point was inside the vacuum tank. The KS used microwave produced plasmas on field lines in the cusp tank region. Two coils on the cusp tank were configured to produce expanding field lines with a large positive radius of curvature. A 5 kW 2.45 GHz magnetron was used to produce an electron cyclotron resonance heated plasma pressure in this region. A reduction in instability duration was observed for high power plasmas. However, for low power plasmas that terminate violently with an <I>m</I> = −1 instability, the KS action made the duration of the instability longer.</P>