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Journal Articles

Research and development of imaging bolometers

Peterson, B. J.*; Konoshima, Shigeru; Kostryukov, A. Y.*; Seo, D. C.*; Liu, Y.*; Miroshnikov, I. V.*; Ashikawa, Naoko*; Parchamy, H.*; Kawashima, Hisato; Iwama, Naofumi*; et al.

Plasma and Fusion Research (Internet), 2, p.S1018_1 - S1018_4, 2007/11

An overview of the research and development of imaging bolometers giving a perspective on the applicability of this diagnostic to a fusion reactor is presented. Traditionally the total power lost from a high temperature has been measured using one dimensional arrays of resistive bolometers. The large number of signal wires associated with these resistive bolometers poses hazards not only at the vacuum interface, but also in the loss of electrical contacts that has been observed in the presence of fusion reactor levels of neutron flux. Infrared imaging video bolometers (IRVB), on the other hand, use the infrared radiation from the absorbing metal foil to transfer the signal through the vacuum interface and out from behind a neutron shield. The IRVB can provide hundreds of channels of bolometric signal in an image of the plasma radiation. Recently a prototype IRVB has been deployed on the JT-60U tokamak which demonstrates the ability of this diagnostic to operate in a reactor environment.

Journal Articles

Application of tomographic imaging to multi-pixel bolometric measurements

Liu, Y.*; Tamura, Naoki*; Peterson, B. J.*; Iwama, Naofumi*; Konoshima, Shigeru; LHD Experimental Group*; JT-60 Team

Plasma and Fusion Research (Internet), 2, p.S1124_1 - S1124_4, 2007/11

Two improved tomographic algorithms, including a linear (Tikhonov-Phillips) and a nonlinear (maximum entropy) regularisation method, have been employed for multi-pixel bolometric measurements in order to get as much information as possible while keeping the assumptions to a minimum. The most important features of these improved methods are the capability of reconstructing radiation distributions without any symmetry assumptions, built-in smoothing, and useful reconstructions with relatively few detectors. Furthermore, the effects of finite detector size have been taken into account with a full three dimensional treatment of the detector geometry. The application of tomographic imaging was implemented to a two-array X-ray camera on the Large Helical Device (LHD) and a two-dimensional infrared imaging bolometric pinhole camera on JT-60U. Pertinent examples of the results are presented both to illustrate the analysis techniques and to demonstrate the wealth of physics which can be studied.

Journal Articles

Feasibility of electron density measurement using relativistic downshift frequency effect of electron cyclotron emission in tokamak plasmas

Sato, Masayasu; Isayama, Akihiko; Iwama, Naofumi*; Kawahata, Kazuo*

Japanese Journal of Applied Physics, Part 2, 44(21), p.L672 - L675, 2005/05

 Times Cited Count:1 Percentile:4.87(Physics, Applied)

no abstracts in English

Journal Articles

Relativistic downshift frequency effects on ECE measurements of electron temperature and density in torus plasmas

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00

no abstracts in English

Journal Articles

Relativistic downshift frequency effects on electron cyclotron emission measurement; Measurements of electron density in tokamak and electron temperature in LHD

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

Proceedings of 13th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, p.89 - 94, 2005/00

no abstracts in English

Journal Articles

Effects of relativistic frequency downshift on measurements of electron cyclotron emission in Large Helical Device plasma

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

Review of Scientific Instruments, 75(10), p.3819 - 3821, 2004/10

 Times Cited Count:0 Percentile:0.01(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Maximum entropy estimation of electron cyclotron emission spectra from incomplete interferograms in ELMy H-mode tokamak experiment

Isayama, Akihiko; Iwama, Naofumi*; Showa, Takeshi*; Hosoda, Yosuke*; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu

Japanese Journal of Applied Physics, Part 1, 42(9A), p.5787 - 5796, 2003/09

 Times Cited Count:3 Percentile:16.05(Physics, Applied)

no abstracts in English

Journal Articles

Singular value decomposition analysis of multichannel electron cyclotron emission signals of tokamak plasma

Isayama, Akihiko; Iwama, Naofumi*; Hosoda, Yosuke*; Satake, Shinsuke*; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu

Japanese Journal of Applied Physics, Part 2, 42(3), p.L329 - L331, 2003/03

 Times Cited Count:2 Percentile:11.07(Physics, Applied)

no abstracts in English

Journal Articles

Electron cyclotron emission measurements in JT-60U

Isei, Nobuaki; Isayama, Akihiko; Ishida, Shinichi; Sato, Masayasu; Oikawa, Toshihiro; Fukuda, Takeshi; Nagashima, Akira; Iwama, Naofumi*; JT-60 Team

Fusion Engineering and Design, 53(1-4), p.213 - 220, 2001/11

 Times Cited Count:16 Percentile:74.22(Nuclear Science & Technology)

no abstracts in English

Oral presentation

Relativistic downshift frequency effects on ECE measurements of electron temperature and density in LHD and tokamak plasmas

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

no journal, , 

no abstracts in English

10 (Records 1-10 displayed on this page)
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