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Journal Articles

Progress at JET in integrating ITER-relevant core and edge plasmas within the constraints of an ITER-like wall

Giroud, C.*; Jachmich, S.*; Jacquet, P.*; J$"a$rvinen, A.*; Lerche, E.*; Rimini, F.*; Aho-Mantila, L.*; Aiba, Nobuyuki; Balboa, I.*; Belo, P.*; et al.

Plasma Physics and Controlled Fusion, 57(3), p.035004_1 - 035004_20, 2015/03

 Times Cited Count:51 Percentile:96.77(Physics, Fluids & Plasmas)

This paper reports the progress made at JET-ILW on integrating the requirements of the reference ITER baseline scenario with normalized confinement factor of 1, at a normalized pressure of 1.8 together with partially detached divertor whilst maintaining these conditions over many energy confinement times. The 2.5 MA high triangularity ELMy H-modes are studied with two different divertor configurations with D-gas injection and nitrogen seeding. The power load reduction with N seeding is reported. The relationship between an increase in energy confinement and pedestal pressure with triangularity is investigated. The operational space of both plasma configurations is studied together with the ELM energy losses and stability of the pedestal of unseeded and seeded plasmas.

Journal Articles

On maximizing the ICRF antenna loading for ITER plasmas

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.

Journal Articles

Development of cold isostatic pressing graphite module for a heat-resistant lower hybrid current drive antenna

Maebara, Sunao; Goniche, M.*; Kazarian, F.*; Seki, Masami; Ikeda, Yoshitaka; Imai, Tsuyoshi*; Beaumont, B.*

Review of Scientific Instruments, 76(5), p.053501_1 - 053501_7, 2005/05

 Times Cited Count:1 Percentile:10.49(Instruments & Instrumentation)

Development of a plasma facing module using Cold Isostatic Pressing Graphite (CIPG) had been done for a heat-resistant LHCD antenna. A thin stainless film (10$$mu$$m), molybdenum film (10$$mu$$m) and copper film (50$$mu$$m) are laid to overlap each other on the CIPG materials, the CIPG surfaces were successfully coated with copper layer by diffusion bonding method. This module has four waveguides and a water cooling channel, the length is 206 mm. High power long pulse operation was successfully achieved up to 250 kW (125 MW/m$$^{2}$$)/700s. The module has been successfully tested at a RF power density which is equivalent, in terms of RF electric field (5kV/cm), to the one proposed for the LHCD antenna of ITER-FEAT. The outgassing rate of the copper-coated CIPG is estimated to be 3.2-5.1$$times$$10$$^{-6}$$ Pa.m$$^{3}$$/s.m$$^{2}$$ at 100$$^{circ}$$C, it is assessed that a pumping system is not required to evacuate the pressure in the LHCD antenna.

Journal Articles

Outgassing of lower hybrid antenna modules during high-power long-pulse transmission

Goniche, M.*; Kazarian, F.*; Bibet, P.*; Maebara, Sunao; Seki, Masami; Ikeda, Yoshitaka; Imai, Tsuyoshi*

Journal of Vacuum Science and Technology A, 23(1), p.55 - 65, 2005/01

 Times Cited Count:2 Percentile:9.78(Materials Science, Coatings & Films)

Outgassing rates have been measured for long duration (100-4700 seconds) of RF transmission at high power density (50-200 MW/m$$^{2}$$) for waveguides made of OFHC copper, dispersoid copper, copper-coated carbon fiber composite and copper-coated graphite. The measurements were performed on multi-waveguide(2 to 8)mockups, using a test bed facility equipped with a 3.7 GHz klystron. The effect on the outgassing rate of waveguide surface temperature and of initial wall gas loading('conditioning'), is examined. It is concluded that an outgassing rate of 1$$times$$10$$^{-5}$$ Pam$$^{3}$$s$$^{-1}$$m$$^{-2}$$ and 5$$times$$10$$^{-5}$$ Pam$$^{3}$$s$$^{-1}$$m$$^{-2}$$ at 300$$^{circ}$$C and 400$$^{circ}$$C respectively, can be expected for the tested material. Based on these measurement results, it is further concluded that no additional pumping will be needed for the LHRF antenna proposed for ITER.

Journal Articles

Outgassing of plasma facing antenna front for lower hybrid wave launcher

Maebara, Sunao; Goniche, M.*; Kazarian, F.*; Seki, Masami; Ikeda, Yoshitaka; Imai, Tsuyoshi; Bibet, P.*; Froissard, P.*; Rey, G.*

Fusion Engineering and Design, 49-50, p.269 - 273, 2000/11

 Times Cited Count:4 Percentile:33.53(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

High RF power test of a lower hybrid module mock-up in carbon fiber composite

Maebara, Sunao; ; Seki, Masami; Suganuma, Kazuaki; Ikeda, Yoshitaka; Imai, Tsuyoshi; Goniche, M.*; J.Brossaud*; V.Cano*; F.Kazarian-Vibert*; et al.

JAERI-Research 97-086, 29 Pages, 1997/11

JAERI-Research-97-086.pdf:1.33MB

no abstracts in English

JAEA Reports

Development of a new lower hybrid antenna module using a poloidal power divider

Maebara, Sunao; Seki, Masami; Suganuma, Kazuaki; Imai, Tsuyoshi; Goniche, M.*; P.Bibet*; S.Berio*; J.Brossaud*; Rey, G.*; G.Tonon*

JAERI-Research 96-036, 82 Pages, 1996/07

JAERI-Research-96-036.pdf:3.08MB

no abstracts in English

JAEA Reports

Performance test of lower hybrid waveguide under long/high-RF power transmission

Seki, Masami; Obara, Kenjiro; Maebara, Sunao; Ikeda, Yoshitaka; Imai, Tsuyoshi; Nagashima, Takashi; Goniche, M.*; J.Brossaud*; C.Barral*; G.Berger-By*; et al.

JAERI-Research 96-025, 55 Pages, 1996/06

JAERI-Research-96-025.pdf:2.06MB

no abstracts in English

Journal Articles

Development of a new lower hybrid antenna module using a poloidal power divider

Maebara, Sunao; Seki, Masami; Suganuma, Kazuaki; Imai, Tsuyoshi; Goniche, M.*; Ph.Bibet*; S.Berio*; J.Brossaud*; Rey, G.*; G.Tonon*

Fusion Technology 1996, 0, p.637 - 640, 1996/00

no abstracts in English

Journal Articles

Outgassing measurement of the waveguide module for a steady state LHCD antenna

Seki, Masami; Obara, Kenjiro; Maebara, Sunao; Ikeda, Yoshitaka; Imai, Tsuyoshi; Nagashima, Takashi; Goniche, M.*; J.Brossaud*; C.Barral*; G.Berger-By*; et al.

Fusion Engineering and Design, 30, p.357 - 367, 1995/00

 Times Cited Count:4 Percentile:51.89(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of LHCD launcher for next stage tokamak

Seki, Masami; Obara, Kenjiro; Maebara, Sunao; Ikeda, Yoshitaka; Imai, Tsuyoshi; Nagashima, Takashi; Goniche, M.*; J.Brossaud*; C.Barral*; G.Berger-By*; et al.

JAERI-Conf 94-001, 0, p.110 - 115, 1994/08

no abstracts in English

11 (Records 1-11 displayed on this page)
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