TY - JOUR
T1 - Progress in research and development of mirrors for ITER diagnostics
JF - Nuclear Fusion
Y1 - 2009
A1 - Litnovsky, A.
A1 - Voitsenya, V.
A1 - Sugie, T.
A1 - De Temmerman, G.
A1 - Costley, A. E.
A1 - Donne, A. J. H.
A1 - Vukolov, K. Y.
A1 - Orlovskiy, I.
A1 - Brooks, J. N.
A1 - Allain, J. P.
A1 - Kotov, V.
A1 - Semerok, A.
A1 - Thro, P. Y.
A1 - Akiyama, T.
A1 - Yoshida, N.
A1 - Tokunaga, T.
A1 - Kawahata, K.
KW - EROSION
KW - EXPOSURE
KW - METAL MIRRORS
KW - SYSTEMS
KW - TEXTOR
KW - TOKAMAK
KW - WINDOW
AB - Metallic mirrors will be used as plasma-viewing elements in all optical and laser diagnostic systems in ITER. In the harsh environment of ITER, the performance of mirrors will decrease mainly because of the erosion of their surfaces and deposition of impurities. The deterioration of the optical properties of diagnostic mirrors will directly affect the entire performance of the respective ITER diagnostics, possibly leading to their shutdown. Therefore, R&D on mirrors is of crucial importance for ITER diagnostics. There is a coordinated worldwide R&D programme supervised by the Specialists Working Group on first mirrors of the International Tokamak Physics Activity, Topical Group on Diagnostics. This paper provides an overview of new results in the field of first mirrors, covering the manufacturing of ITER mirror prototypes, investigations of mitigation of deposition and mirror cleaning and the predictive modelling of the mirror performance in ITER. The current status of research on beryllium deposition-a new critical area of mirror research-is given along with an outlook for future activities.
VL - 49
SN - 0029-5515
UR - ://000267942000014
N1 - ISI Document Delivery No.: 469ZWTimes Cited: 0Cited Reference Count: 33
U1 - Fusion Physics
U5 - 955731b264c84fb98d0e1ec12f9248c0
ER -
TY - Generic
T1 - Advancements of microwave diagnostics in magnetically confined plasmas
Y1 - 2009
A1 - Mase, A.
A1 - Kogi, Y.
A1 - Ito, N.
A1 - Yokota, Y.
A1 - Akaki, K.
A1 - Kawahata, K.
A1 - Nagayama, Y.
A1 - Tokuzawa, T.
A1 - Yamaguchi, S.
A1 - Hojo, H.
A1 - Oyama, N.
A1 - N C Luhmann Jr.
A1 - Park, H. K.
A1 - Donne, A. J. H.
KW - ECE
KW - interferometry
KW - magnetic confinement system
KW - microwave
KW - plasma diagnostics
KW - REFLECTOMETRY
AB - Microwave to millimeter-wave diagnostic techniques such as interferometry, reflectometry, scattering and radiometry have been powerful tools for diagnosing magnetically confined plasmas. Recent advances in electronic devices and components together with computer technology have enabled the development of advanced diagnostics in microwave to millimeter-wave region. The two-dimensional and three-dimensional profiles of plasma density/temperature and dynamic behaviors of their fluctuations are measured by using the advanced diagnostic systems. The measurements have clarified the physics issues such as stability, wave phenomena and fluctuation-induced transport. We report here on the representative microwave diagnostics and their contribution to plasma confinement physics.
PB - Taylor & Francis Ltd
UR - ://000266202000002
N1 - ISI Document Delivery No.: 447OYTimes Cited: 0Cited Reference Count: 25
U1 - Fusion Physics
U5 - 9f6b4ab1257df88e05eb1ca9db3b1d48
ER -
TY - JOUR
T1 - Design of the 48, 57 µm poloidal polarimeter for ITER
JF - Plasma and Fusion Research
Y1 - 2007
A1 - Pavlichenko, R.
A1 - Kawahata, K.
A1 - Donne, A. J. H.
U1 - Fusion Physics
U2 - Instrumentation development
U5 - 8859892d638555a6b2d02abbb674148c
ER -
TY - JOUR
T1 - Experimental studies towards long pulse steady state operation in LHD
JF - Nuclear Fusion
Y1 - 2001
A1 - Noda, N.
A1 - Nakamura, Y.
A1 - Takeiri, Y.
A1 - Mutoh, T.
A1 - Kumazawa, R.
A1 - Sato, M.
A1 - Kawahata, K.
A1 - Yamada, S.
A1 - Shimozuma, T.
A1 - Oka, Y.
A1 - Iiyoshi, A.
A1 - Sakamoto, R.
A1 - Kubota, Y.
A1 - Masuzaki, S.
A1 - Inagaki, S.
A1 - Morisaki, T.
A1 - Suzuki, H.
A1 - Ohyabu, N.
A1 - Adachi, K.
A1 - Akaishi, K.
A1 - Ashikawa, N.
A1 - Chikaraishi, H.
A1 - de Vries, P. C.
A1 - Emoto, M.
A1 - Funaba, H.
A1 - Goto, M.
A1 - Hamaguchi, S.
A1 - Ida, K.
A1 - Idei, H.
A1 - Ikeda, K.
A1 - Imagawa, S.
A1 - Inoue, N.
A1 - Isobe, M.
A1 - Iwamoto, A.
A1 - Kado, S.
A1 - Kaneko, O.
A1 - Kitagawa, S.
A1 - Khlopenkov, K.
A1 - Kobuchi, T.
A1 - Komori, A.
A1 - Kubo, S.
A1 - Liang, Y.
A1 - Maekawa, R.
A1 - Minami, T.
A1 - Mito, T.
A1 - Miyazawa, J.
A1 - Morita, S.
A1 - Murai, K.
A1 - Murakami, S.
A1 - Muto, S.
A1 - Nagayama, Y.
A1 - Nakanishi, H.
A1 - Narihara, K.
A1 - Nishimura, A.
A1 - Nishimura, K.
A1 - Nishizawa, A.
A1 - Notake, T.
A1 - Ohdachi, S.
A1 - Okamoto, M.
A1 - Osakabe, M.
A1 - Ozaki, T.
A1 - Pavlichenko, R. O.
A1 - Peterson, B. J.
A1 - Sagara, A.
A1 - Saito, K.
A1 - Sakakibara, S.
A1 - Sasao, H.
A1 - Sasao, M.
A1 - Sato, K.
A1 - Seki, T.
A1 - Shoji, M.
A1 - Sugama, H.
A1 - Takahata, K.
A1 - Takechi, M.
A1 - Tamura, H.
A1 - Tamura, N.
A1 - Tanaka, K.
A1 - Toi, K.
A1 - Tokuzawa, T.
A1 - Torii, Y.
A1 - Tsumori, K.
A1 - Watanabe, K. Y.
A1 - Watanabe, T.
A1 - Watari, T.
A1 - Yanagi, N.
A1 - Yamada, I.
A1 - Yamada, H.
A1 - Yamaguchi, S.
A1 - Yamamoto, S.
A1 - Yamamoto, T.
A1 - Yokoyama, M.
A1 - Yoshimura, Y.
A1 - Ohtake, I.
A1 - Akiyama, R.
A1 - Haba, K.
A1 - Iima, M.
A1 - Kodaira, J.
A1 - Tsuzuki, K.
A1 - Itoh, K.
A1 - Matsuoka, K.
A1 - Ohkubo, K.
A1 - Satoh, S.
A1 - Satow, T.
A1 - Sudo, S.
A1 - Tanahashi, S.
A1 - Yamazaki, K.
A1 - Motojima, O.
A1 - Hamada, Y.
A1 - Fujiwara, M.
AB - In the Large Helical Device, stable discharges lasting longer than one minute have been obtained using the complete heating scheme, including ECH. The plasma is sustained with NBI or ICRF of 0.5-1 MW. The central plasma temperature is higher than 1.5 keV with a density of (1-2) x 10(19) m(-3) maintained until the end of the pulse. Full installation of the carbon divertor has contributed to this achievement. This provides a sufficient basis for physics and technology studies for the next campaign. Long pulse operation opens new possibilities in diagnostics and in physics studies. Higher accuracy and reliability are obtained with a diagnostics parameter scan, longer integration of signals or two dimensional measurement. The mechanism of a slow oscillation called 'breathing' is discussed. Hydrogen recycling analysis has been carried out and preliminary results have been obtained. On the basis of these results, the future programme is divided into two categories: (i) physics and technology experiments utilizing long pulse discharges lasting up to 5 minutes, and (ii) extension of the pulse length up to one hour.
VL - 41
SN - 0029-5515; 1741-4326
U5 - 3347e2694d4225255b5acce27fce657c
ER -