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Journal Articles

Study on magnetic property change on neutron irradiated austenitic stainless steel

Nemoto, Yoshiyuki; Oishi, Makoto; Ito, Masayasu; Kaji, Yoshiyuki

Nihon Hozen Gakkai Dai-12-Kai Gakujutsu Koenkai Yoshishu, p.105 - 112, 2015/07

Authors previously reported that Eddy current method and AC magnetization method have potential to be applied for development of diagnostic technics to detect the sign of material degradation before cracking on the austenitic stainless steels used as structural material in nuclear power plants. In typical austenitic stainless steels such as type304, magnetic ferrite phase would exist in the alloy before irradiation, and it is concerned to disturb the magnetic measurement on irradiated material. Magnetic measurements were conducted in this work on type304 austenitic stainless steel specimens irradiated up to different doses. In addition, microstructure observation was conducted on the area including grain boundary to discuss the correlation of magnetization on irradiated austenitic stainless alloy and grain boundary cracking. Obtained magnetic data on irradiated type304 stainless steel were seen clearly different from that on un-irradiated specimen, and showed positive correlation with radiation dose, therefore it was thought that magnetic measurement technics can be applied for the material which contains certain quantity of ferrite phase before irradiation. In the microstructural observation, magnetic phase (FeNi$$_{3}$$) formation along the grain boundary was revealed.

Journal Articles

Eddy current effect of magnets for J-PARC 3-GeV synchrotron

Tani, Norio; Adachi, Toshikazu*; Someya, Hirohiko*; Watanabe, Yasuhiro; Sato, Hikaru*; Kishiro, Junichi

IEEE Transactions on Applied Superconductivity, 14(2), p.421 - 424, 2004/06

 Times Cited Count:11 Percentile:51.18(Engineering, Electrical & Electronic)

The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project (J-PARC) is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400-MeV to 3-GeV at a repetition rate of 25-Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a larger fringe field at a pole end than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components, magnet end plates and etc. The eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate an effect of large leakage field and eddy current to the beam motion around the magnet end part. We have measured the eddy loss and the eddy field at the edges of the dipole and quadrupole magnets. In this paper, we report the comparison between the results of the measurements and the two-dimensional eddy current model developed for this study.

Journal Articles

Design of a dipole magnet for the 3-GeV proton synchrotron of the JAERI/KEK joint project

Tani, Norio; Kanazawa, Kenichiro; Shimada, Taihei; Suzuki, Hiromitsu; Watanabe, Yasuhiro; Adachi, Toshikazu*; Someya, Hirohiko*

Proceedings of 8th European Particle Accelerator Conference (EPAC 2002), p.2376 - 2378, 2002/00

The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400 MeV to 3 GeV at a repetition rate of 25 Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. It also works as an injector for a 50-GeV synchrotron. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a large leakage field at an end part than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components: e.g. a coil, magnet end plates and etc. We intend to use a stranded conductor as a coil conductor so that the eddy current induced in the coil can be reduced. On the other hand, the eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate an effect of the large leakage field and the eddy current to the beam motion around the magnet end part. We have constructed a prototype dipole magnet and field measurement system for this purpose. This paper reports the results of the design and the preliminary test about this magnet.

JAEA Reports

AC loss calculation of central solenoid model coil

A.Gilanyi*; Akiba, Masato; Okumura, Yoshikazu; Sugimoto, Makoto; Takahashi, Yoshikazu; Tsuji, Hiroshi

JAERI-Research 99-014, 71 Pages, 1999/03

JAERI-Research-99-014.pdf:3.56MB

no abstracts in English

Journal Articles

Approximation of eddy currents in three dimensional structures by toroidally symmetric models,and plasma control issues

Senda, Ikuo*; Shoji, Teruaki; Tsunematsu, Toshihide; *; Fujieda, Hirobumi*

Nuclear Fusion, 37(8), p.1129 - 1145, 1997/00

 Times Cited Count:9 Percentile:34.32(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Analytical study of electromagnetic forces induced by eddy current in ITER divertor

Araki, Masanori; Sato, Kazuyoshi; ; Akiba, Masato

Fusion Technology, 30(3), p.674 - 679, 1996/12

no abstracts in English

Journal Articles

Electromagnetic analysis in the tokamak fusion reactor and large helical device

Koizumi, Koichi; Yamazaki, Kozo*

Purazuma, Kaku Yugo Gakkai-Shi, 72(12), p.1352 - 1361, 1996/12

no abstracts in English

JAEA Reports

Journal Articles

Acceleration mechanism of vertical displacement event and its amelioration in tokamak disruptions

Nakamura, Yukiharu; Yoshino, Ryuji; N.Pomphrey*; S.C.Jardin*

Journal of Nuclear Science and Technology, 33(8), p.609 - 619, 1996/08

 Times Cited Count:6 Percentile:50.93(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Assessment on F/W electrical cutting for reduction of electromagnetic force on the blanket module

*; Komatsuzaki, Manabu*; Nishio, Satoshi; Koizumi, Koichi; Takatsu, Hideyuki

JAERI-Tech 96-031, 16 Pages, 1996/07

JAERI-Tech-96-031.pdf:0.94MB

no abstracts in English

JAEA Reports

Optimizing voltage wave forms of poloidal field coils at the plasma breakdown

Senda, Ikuo*; Shoji, Teruaki; *; Fujieda, Hirobumi*; Tsunematsu, Toshihide

JAERI-Tech 96-016, 23 Pages, 1996/03

JAERI-Tech-96-016.pdf:0.75MB

no abstracts in English

Journal Articles

Applicability of eddy current analysis by a network mesh method to electromagnetomechanical problems and its experimental verification

Nishio, Satoshi; Miura, H.*; *

International Journal of Applied Electromagnetics and Mechanics, 6, p.37 - 54, 1995/00

no abstracts in English

Journal Articles

Study on structural integrity of graphite components for surface flaw; Applicability of the eddy current testing as acceptance test for graphite components

Ishihara, Masahiro; Iyoku, Tatsuo; *

JCOSSAR95 Rombunshu, 0, p.199 - 206, 1995/00

no abstracts in English

JAEA Reports

Eddy current testing on structures of nuclear-grade PGX graphite for acceptance test in HTTR

Ishihara, Masahiro; Saikusa, Akio; Iyoku, Tatsuo; Shiozawa, Shusaku; Ooka, Norikazu; *; *

JAERI-M 93-252, 39 Pages, 1994/01

JAERI-M-93-252.pdf:0.82MB

no abstracts in English

Journal Articles

Development of an in-service inspection technique for the intermediate heat exchanger tubes of the High-Temperature Engineering Test Reactor

Inagaki, Yoshiyuki; ; *; *; *

Nuclear Technology, 104, p.106 - 117, 1993/10

 Times Cited Count:2 Percentile:30.22(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Eddy current testing on structures of nuclear-grade IG-110 graphite for acceptance test in HTTR

Ishihara, Masahiro; Saikusa, Akio; Iyoku, Tatsuo; Shiozawa, Shusaku; Ooka, Norikazu; *; *; *; *; *

JAERI-M 93-197, 44 Pages, 1993/09

JAERI-M-93-197.pdf:1.06MB

no abstracts in English

Journal Articles

Inspection performance of eddy current probe for in-service inspection of HTTR intermediate heat exchanger tubes

Inagaki, Yoshiyuki; ; *; *

Nihon Genshiryoku Gakkai-Shi, 35(3), p.227 - 236, 1993/03

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Performance test of inservice inspection equipment for HTTR intermediate heat exchanger tubes

Inagaki, Yoshiyuki; ; *; *; *; *

JAERI-M 92-151, 49 Pages, 1992/10

JAERI-M-92-151.pdf:1.57MB

no abstracts in English

JAEA Reports

JT-60 upgrade vertical stability experiments and analysis

D.A.Humphreys*; Yoshino, Ryuji

JAERI-M 92-069, 25 Pages, 1992/05

JAERI-M-92-069.pdf:0.87MB

no abstracts in English

Journal Articles

Disruption behavior of plasma and vacuum vessel in JT-60U

Neyatani, Yuzuru; Ushigusa, Kenkichi; Matsukawa, Makoto; Ninomiya, Hiromasa

Proc. of the 1992 Int. Conf. on Plasma Physics,Vol. 16C,Part 1, p.I447 - I450, 1992/00

no abstracts in English

27 (Records 1-20 displayed on this page)