Search

第38回宇宙エネルギーシンポジウム (2019年3月1日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県, 38th ISAS Space Energy Symposium (March 1, 2019. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000141006, レポート番号: 6

第33回宇宙環境利用シンポジウム (2019年1月24日-25日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県, Space Utilization Research (January 24-25, 2019. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000132005, レポート番号: G-04

第32回宇宙環境利用シンポジウム (2018年1月15日-16日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県, Space Utilization Research (January 15-16, 2018. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000117020, レポート番号: G-15

Electrochemical formation of a Ca-Si film in a molten CaCl2-KCl at 923 K was investigated. Potentiostatic electrolysis of a Si electrode at −0.10 V for 1 h resulted in the formation of a multiphase Ca-Si film having a thickness of about 30 μm. The Ca-Si film was converted into other alloy phases by anodic potentiostatic electrolysis after the cathodic electrodeposition of Ca metal at −0.10 V. The various transformation reactions and the corresponding equilibrium potentials were clarified. At 923 K, the equilibrium potential was found to be 0.18 V (CaSi2). Reflectance measurements in the ultraviolet, visible, and near-infrared region clarified that the CaSi2 film has a direct bandgap of 3.1 eV.

A cost model for a tokamak fusion power plant (FPP) is improved to evaluate material cost and manufacture cost, separately. Then, the improved cost model is applied to a commercial tokamak FPP, and reduction of FPP construction cost is investigated considering learning effect on manufacture of the fusion island part and the advanced manufacture of toroidal field (TF) coils. Finally, a development scenario of a tokamak FPP is proposed to contribute substantially to global climate stabilization under the framework of the Paris Agreement.

第30回宇宙環境利用シンポジウム (2016年1月19日-20日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県, Space Utilization Research (January 19-20, 2016. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000048032, レポート番号: G-28

第27回宇宙利用シンポジウム (2011年1月24日-25日, 宇宙航空研究開発機構宇宙科学研究所相模原キャンパス), 相模原市, 神奈川県, The Twenty-seventh Space Utilization Symposium (January 24-25, 2011. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, "Electrochemical Nucleation & Growth" ESA ITT (PI: Prof. M. Rosso) started the activity in 2010. The team covers 4 categories: 1)Electrochemical Nucleation, 2)Dendritic Growth Process, 3)Kinetic Monte Carlo Simulation and 4)Gas Evolution Electrode. JAXA Nanomaterials WG is going to engage in Electrochemical Processing of Nanostructured Semiconductor Devices in order to support ESA research team. Electrochemical nucleation phenomena of metals are examined with micro- or even nano-capillary electrode fabricated by anodic oxidation process. We have focused ZnO Nanowire Formation Mechanism. Present interest also extends to Electrochemical Processing of Si Nanowire in Ionic Liquid and High Temperature Molten Salt. Amorphous SiO2 powder refined from diatomaceous earth (5N in purity, DE-SiO2) was electrolytically reduced to Si at 1.00 and 1.20 V vs. Ca(exp 2+)/Ca in molten CaCl2 at 1123 K. Electrochemical processing of Si micro- or nano-rod is now challenged as well as Li electrodeposition in ionic liquids., 著者人数: 28人, Number of authors: 28, 資料番号: AA0065129085

第26回宇宙利用シンポジウム(2010年1月25日-26日, 宇宙航空研究開発機構宇宙科学研究本部相模原キャンパス), The Twenty-sixth Space Utilization Symposium (January 25-26, 2010: ISAS/JAXA Sagamihara, Japan), Non-equilibrium electrochemical processing of ZnO nanowire arrays is engaged in Kyoto University. The gravitational level effect has been recognized in the uniformity of PL characteristics of electrodeposited ZnO nanowire arrays. Amorphous Si thin film has been also electrodeposited in ionic liquid(TMHATFSI-0.1MSiCl4) as well as PC organic electrolyte. Based on these achievements, the electrodeposition of Si nanowire is now challenging. Amorphous SiO2 powder refined from diatomaceous earth (DE-SiO2, 5N in purity) are pressed into pellets, and the electrolytic reduction of them is investigated in molten CaCl2 at 1123 K. DE-SiO2 pellets are successfully reduced to Si at 1.00 and 1.20 V vs. Ca(2+)/Ca. Rod-like nanostructure is observed in SEM of reduced Si sample. Furthermore, the reduction rate of DE-SiO2 pellet is higher than that for fumed-SiO2 pellet. DE-SiO2 will be one of the most promising Si sources in the industrial-scale electrolytic reduction in both aspects of the reduction rate and the abundance of the resources., 共催: 日本学術会議, 著者人数: 29人, joint hosting: The Science Council of Japan, 資料番号: AA0064730029

Actual heating systems have not been considered yet for reaching the ignition regime in FFHR helical reactor. Although NBI heating is a first candidate to access the low density and high temperature ignition regime, it is uncertain whether such system can be used to access the high density and low temperature ignition regime. In this work the foreseeable NBI energy of ~1.5 MeV is assumed and examined for reaching both ignition regimes in the FFHR. Together with the stabilizing technique of the thermal instability by the proportional-integral-derivative (PID) control algorithm based on the fusion power, we propose the new operation scenario to access the high-density ignition regime using neutral beam heating system with ~1.5 MeV energy. In this new scenario the density is kept at the low value less than ~4x10^〈20〉m^〈-3〉 to ensure the neutral beam penetration and the operating point passes near the saddle point on Plasma Operation Contour (POPCON) map. Above the density of 4x10^〈20〉m^〈-3〉, high-density ignition is accessed by alpha heating after turning off NBI injection.

Thermal properties of alkali bis(fluorosulfonyl)amides, MFSA (M = Li, K, Cs), have been investigated. Binary phase diagrams of LiFSA-KFSA, LiFSA-CsFSA and KFSA-CsFSA systems have been constructed. The eutectic point for the binary systems are 338 K at (xLi, xK) = (0.45, 0.55), 331 K at (xLi, xCs) = (0.40, 0.60) and 333 K at (xK, xCs) = (0.60, 0.40). The eutectic point for the ternary LiFSA-KFSA-CsFSA system is 309 K at a nearly equimolar composition. The electrochemical window of the LiFSA-KFSA at 348 K and LiFSA-KFSA-CsFSA at 325 K are as wide as 6.0 V with the cathode limit being lithium metal deposition. These new inorganic ionic liquids are highly promising for various electrochemical applications.