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Ishikawa, Takatsugu*; Tsuchikawa, Yusuke; FOREST Collaboration*; 48 of others*
Acta Physica Polonica B, 51(1), p.27 - 32, 2020/00
Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)Nakano, Tomohide; Shumack, A.*; Maggi, C. F.*; Reinke, M.*; Lawson, K.*; Coffey, I.*; Ptterich, T.*; Brezinsek, S.*; Lipschultz, B.*; Matthews, G. F.*; et al.
Journal of Physics B; Atomic, Molecular and Optical Physics, 48(14), p.144023_1 - 144023_11, 2015/07
Times Cited Count:29 Percentile:82.31(Optics)The and 3p-4d inner shell excitation lines in addition to 2p-3s lines have been identified from the spectrum taken by an upgraded high-resolution X-ray spectrometer. It is found from analysis of the absolute intensities of the and lines that W and Mo concentrations are in the range of and , respectively, with a ratio of 5% for ELMy H-mode plasmas with a plasma current of 2.0- 2.5 MA, a toroidal magnetic field of 2.7 T and a neutral beam injection power of 14-18 MW. For the purpose of checking self-consistency, it is confirmed that the W concentration determined from the line is in agreement with that from the line within 20% and that the plasma effective charge determined from the continuum of the first order reflection spectrum is also in agreement with that from the second order within 50%. Further, the determined plasma effective charge is in agreement with that determined from a visible spectroscopy, confirming that the sensitivity of the X-ray spectrometer is valid and that probably the W and the Mo concentrations are also valid.
Cooper, W. A.*; Brunetti, D.*; Faustin, J. M.*; Graves, J. P.*; Pfefferl, D.*; Raghunathan, M.*; Sauter, O.*; Tran, T. M.*; Chapman, I. T.*; Ham, C. J.*; et al.
Nuclear Fusion, 55(6), p.063032_1 - 063032_8, 2015/05
Times Cited Count:2 Percentile:9.03(Physics, Fluids & Plasmas)An approximate model for a single fluid 3D MHD equilibrium with pure isothermal toroidal flow with imposed nested magnetic flux surfaces is proposed. It recovers the rigorous toroidal rotation equilibrium description in the axisymmetric limit. The approximation is valid under conditions of nearly rigid or vanishing toroidal rotation in regions with 3D deformation of the equilibrium flux surfaces. Bifurcated helical core equilibrium simulations of long-lived modes in the MAST device demonstrate that the magnetic structure is only weakly affected by the flow but that the 3D pressure distortion is important. The pressure is displaced away from the major axis and therefore is not as noticeably helically deformed as the toroidal magnetic flux under the subsonic flow conditions. Fast particle confinement is investigated with the VENUS code. In the presence of toroidal flow, the drift orbit equations depend on the electrostatic potential associated with the rotation and quasineutrality at lowest order in Larmor radius. When the equilibrium has 3D deformations, geometrical terms appear from the evaluation of Ohm's Law that considerably complicates the description of fast particle confinement.
Mayoral, M.-L.*; Bobkov, V.*; Colas, L.*; Goniche, M.*; Hosea, J.*; Kwak, J. G.*; Pinsker, R.*; Moriyama, Shinichi; Wukitch, S.*; Baity, F. W.*; et al.
Proceedings of 23rd IAEA Fusion Energy Conference (FEC 2010) (CD-ROM), 11 Pages, 2011/03
For any given ICRF antenna design for ITER, the maximum achievable power strongly depends on the density profiles in the SOL. It has been suggested that gas injection can be used to modify the SOL profiles and thus minimize the sensitivity of the ICRF coupling to variations in the density at the edge of the confined plasma. Recently joint experiments coordinated by the ITPA were performed to characterize further this method. An increase in SOL density during gas injection led to improved coupling for all tokamaks in this multi-machine comparison. The effectiveness of using gas injection over a wide range of conditions, as a tool to tailor the edge density in front of the ICRF antennas, is documented for different gas inlet location and plasma configurations. In addition, any deleterious effects on the confinement and interaction with the antenna near-field are not investigated.
Maggi, C. F.*; Groebner, R. J.*; Oyama, Naoyuki; Sartori, R.*; Horton, L. D.*; Sips, A. C. C.*; Suttrop, W.*; ASDEX Upgrade Team; Leonard, A.*; Luce, T. C.*; et al.
Nuclear Fusion, 47(7), p.535 - 551, 2007/07
Times Cited Count:63 Percentile:88.45(Physics, Fluids & Plasmas)Pedestal and global plasma parameters are compared in ELMy H-modes and improved confinement discharges from ASDEX Upgrade (AUG), DIII-D, JET and JT-60U with varying net input power. The pedestal top pressure increases moderately with power, in broad agreement with the power dependence of the H98(y,2) scaling. For all machines and all scenarios a robust correlation between the total and the pedestal thermal stored energy is observed. In AUG the improved confinement is due to improved pedestal confinement in improved H-modes with early heating and to both improved pedestal and core confinement in improved H-modes with late heating. In DIII-D the increase in confinement is due to improved confinement in the plasma core. JT-60U reversed shear H-modes have strong internal transport barriers and thus improved core performance. In all four tokamaks improved edge stability is correlated with increasing total and H98(y,2) increases with pedestal .
Maggi, C. F.*; Groebner, R. J.*; Oyama, Naoyuki; Sartori, R.*; Horton, L. D.*; Sips, A. C. C.*; Suttrop, W.*; ASDEX Upgrade Team; Leonard, T.*; Luce, T. C.*; et al.
Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 8 Pages, 2007/03
Pedestal and global plasma parameters are compared in ELMy H-mode discharges from ASDEX Upgrade (AUG), DIII-D, JET and JT-60U. The increase in pedestal pressure (p) with power is continuous, reflecting the continuous transition from "standard H-mode" to "improved confinement scenario". In AUG improved H-modes p increases with power due to an increase of both pedestal top density and temperature. In DIII-D p increases primarily due to an increase of the pedestal temperature. In JT-60U high H-modes at = 6.5 and high the improved confinement is due to an increase of , while in reversed shear H-modes to an increase of . In JET hybrid discharges at 1.4 MA increases with power and due to an increase of . In all four tokamaks improved edge stability is correlated to increasing total and H98(y,2) increases with pedestal .
Oda, Keiji*; Takahashi, Fumiaki; Expert Committee on Concepts of Dosimetric Quantities Used in Radiological protection, Japan Health
Proceedings of 2nd Asian and Oceanic Congress Radiological Protection (AOCRP-2) (CD-ROM), p.52 - 55, 2006/10
no abstracts in English
Secretariat of Third JAERI-JNC Joint Conference on Nuclear Safety Research
JAEA-Conf 2006-002, 103 Pages, 2006/03
The present report is the proceedings of third JAERI-JNC joint conference on nuclear safety research held on July 29, 2005 in Tokyo before integration of JAERI and JNC to JAEA. The conference was held for those who are relevant to nuclear industries and regulatory organizations, and general public. The nuclear safety research has been conducted in both institutes according to the Five-Year Program for Nuclear Safety Research established periodically by the Nuclear Safety Commission (NSC) and needs from the regulatory organizations. The objectives of the conference are to present its recent results and to collect views and opinions from the participants for its future program through the discussion after each presentation and panel discussion on how to conduct efficiently the nuclear safety research in the New Organization. A total of 234 people participated in the conference mainly from the nuclear industries and regulatory organizations. Through vigorous exchange of views in the panel discussion and descriptions on the questionnaires, it was obviously expressed that expectation to the safety research of the New Organization was very strong. Moreover, many valuable views were given for carrying out the nuclear safety research in the new organization and for holding a conference in future. Based on these results, it was believed that the objectives of this conference were almost achieved.
Research and Development Coordinate Section, O-arai Engineering Center
JNC TN9200 2004-002, 89 Pages, 2005/01
The 16th Meeting for Reporting Safety Research on FBR was held at the O-arai Engineering Center on the 19th of October in 2004. The 6 subjects from the 24 subjects in total have been presented in the power reactor field of fast breeder reactor, according to the selection by the sub-committees of the Sectional Meeting of Safety Research. The outcomes on these subjects in FY2003 were reported and discussed at the meeting. This meeting was open to the public. Related specialists outside of JNC were invited for the purpose of getting advice and joined the discussion. This report contains presentation papers, questions and answers, list of attendance, etc. Refer to the JNC open report*3) for detailed results of safety research in FY2003.
Reseach and Development Coordi
JNC TN9440 2004-003, 233 Pages, 2004/10
None
Secretariat of Second JAERI-JNC Joint Conference on Nuclear Safety Research
JAERI-Conf 2004-013, 97 Pages, 2004/08
no abstracts in English
Research and Development Coord
JNC TN9440 2004-001, 121 Pages, 2004/04
None
Research and Development Coord
JNC TN9440 2003-003, 228 Pages, 2003/10
None
Secretariat of JAERI-JNC Joint Conference on Nuclear Safety Research
JAERI-Conf 2003-013, 110 Pages, 2003/08
no abstracts in English
Power Reactor and Nuclear Fuel Development Corporation
PNC TN1102 98-006, 164 Pages, 1998/02
Power Reactor and Nuclear Fuel Development Corporation
PNC TN1410 98-002, 108 Pages, 1998/01
no abstracts in English
Power Reactor and Nuclear Fuel Development Corporation
PNC TN1410 97-040, 162 Pages, 1997/11
None