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Journal Articles

ITPA meeting report, 43

Kawano, Yasunori; Itami, Kiyoshi; Kawahata, Kazuo*; Kusama, Yoshinori; Sasao, Mamiko*; Peterson, B.*; Mase, Atsushi*

Purazuma, Kaku Yugo Gakkai-Shi, 90(2), P. 164, 2014/02

no abstracts in English

Journal Articles

ITPA meeting report, 41

Itami, Kiyoshi; Kawano, Yasunori; Kawahata, Kazuo*; Kusama, Yoshinori; Sasao, Mamiko*; Peterson, B.*; Mase, Atsushi*

Purazuma, Kaku Yugo Gakkai-Shi, 89(9), P. 638, 2013/09

no abstracts in English

Journal Articles

Report on ITPA meeting, 33

Asakura, Nobuyuki; Ashikawa, Naoko*; Ueda, Yoshio*; Ono, Noriyasu*; Tanabe, Tetsuo*; Nakano, Tomohide; Masuzaki, Suguru*; Itami, Kiyoshi; Kawano, Yasunori; Kawahata, Kazuo*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 87(7), p.485 - 486, 2011/07

no abstracts in English

Journal Articles

Development of millimeter-wave planar antennas using low-loss materials

Ito, Naoki*; Mase, Atsushi*; Kogi, Yuichiro*; Seko, Noriaki; Tamada, Masao; Shimazu, Hiroshi*; Sakata, Eiji*

Japanese Journal of Applied Physics, 49(10), p.106506_1 - 106506_5, 2010/10

 Times Cited Count:0 Percentile:0(Physics, Applied)

As the importance of advanced millimeter-wave diagnostics increases, the fabrications of high-performance devices and components become essential. This paper describes the development of millimeter-wave planar antennas using low-loss fluorine substrates. The problems to be solved for the present purpose are the low degree of adhesion between copper foil and fluorine substrate and the accuracy of device pattern using conventional fabrication techniques. In order to solve these problems, surface treatment of fluorine films and a fabrication method using Electro-Fine-Forming (EF2) are proposed. In order to confirm the performance of the treated films, microstrip lines (MSL) and the planar patch antennas with low-sidelobe level in E-plane are designed and fabricated on the conventional fluorine substrates and on the grafted-PTFE (Polytetrafluoroethylene) films.

Journal Articles

ITPA meeting report, 30

Kawano, Yasunori; Sasao, Mamiko*; Mase, Atsushi*; Kawahata, Kazuo*; Kusama, Yoshinori; Peterson, B.*; Itami, Kiyoshi

Purazuma, Kaku Yugo Gakkai-Shi, 86(9), P. 552, 2010/09

no abstracts in English

Journal Articles

27th report of ITPA topical group meeting

Osakabe, Masaki*; Shinohara, Koji; Toi, Kazuo*; Todo, Yasushi*; Hamamatsu, Kiyotaka; Murakami, Sadayoshi*; Yamamoto, Satoshi*; Idomura, Yasuhiro; Sakamoto, Yoshiteru; Tanaka, Kenji*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 85(12), p.839 - 842, 2009/12

no abstracts in English

Journal Articles

ITPA meeting report, 25

Kawano, Yasunori; Sasao, Mamiko*; Mase, Atsushi*; Kawahata, Kazuo*; Kusama, Yoshinori; Peterson, B.*; Itami, Kiyoshi

Purazuma, Kaku Yugo Gakkai-Shi, 85(5), P. 314, 2009/05

The 15th meeting of international tokamak physics activity (ITPA) topical group on diagnostics was held in Ahmadabad, India, 17-20 November 2008. Fifty-three scientists participated the meeting (JA:2, IN:24, EU:17, US:3, RF:3, ITER Organization (IO):4). In 2008, ITPA was restructured to be the activity under the "auspice of ITER". Accordingly, the chair and the co-chair persons were newly appointed. Since it was the first meeting after the restructuring, new guidelines of activities in this topical group were discussed together with the progress of high priority items defined by this group and status of development of ITER diagnostics in ITER participant parties and IO. In this report, the outline of the meeting is presented.

Journal Articles

Development of millimeter-wave devices using grafted-PTFE films

Ito, Naoki*; Mase, Atsushi*; Kogi, Yuichiro*; Seko, Noriaki; Tamada, Masao; Sakata, Eiji*

JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 42, 2008/11

no abstracts in English

Journal Articles

Development of planar devices using low-loss materials

Ito, Naoki*; Mase, Atsushi*; Kogi, Yuichiro*; Seko, Noriaki; Tamada, Masao; Sakata, Eiji*

Proceedings of 11th IEEE International Conference on Communication Technology (ICCT 2008), 3 Pages, 2008/11

As the importance of advanced microwave and millimeter-wave diagnostics increases, the fabrications of high-performance planar devices become essential. This paper describes the development of planar devices such as antennas using low-loss fluorine materials. The problems to be solved for the present purpose are the low degree of adhesion between copper foil and fluorine substrate and the accuracy of device pattern using conventional fabrication techniques. In order to solve these problems, surface treatment of fluorine films and a fabrication method using Electro-Fine-Forming (EF2) are proposed. The peel adhesion strength between the metal and the fluorine films and the value of dielectric constant of the fluorine films before and after grafting are reported. In order to confirm the performance of the treated films, microstrip lines are fabricated on the conventional fluorine substrates and on the grafted-PTFE (Polytetrafluoroethylene) films. The prototype antennas using fluorine substrates with EF2 fabrication technique are also introduced.

Journal Articles

ITPA Meeting report, 23

Kawano, Yasunori; Mase, Atsushi*; Sasao, Mamiko*; Kawahata, Kazuo*; Kusama, Yoshinori

Purazuma, Kaku Yugo Gakkai-Shi, 84(8), p.558 - 559, 2008/08

The 14th meeting on ITPA topical group on Diagnostics was held for 14-18 April 2008 at Swiss Federal Institute of Technology, Lausanne. The number of participants was sixty-three (JA: 9, CN: 2, EU: 42, US: 2, RF: 1, KO: 1, ITER Organization: 6). Recent activities of Specialist working groups on high priority areas for ITER diagnostics and progress in ITER participating parties for developments of fusion plasma diagnostics were presented and discussed. A special session was dedicated to discuss about the effects of reflection on vacuum vessel wall to optical diagnostics. Outline of the presentations and discussions at the meeting is reported here.

Journal Articles

Report of ITPA (International Tokamak Physics Activity) meetings, 21

Kawahata, Kazuo*; Kawano, Yasunori; Kusama, Yoshinori; Mase, Atsushi*; Sasao, Mamiko*; Ide, Shunsuke; Oikawa, Toshihiro; Suzuki, Takahiro; Takase, Yuichi*; Nakamura, Yukio*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 84(5), p.297 - 298, 2008/05

no abstracts in English

Journal Articles

Development of low-loss millimeter-wave devices using fluororesin

Ito, Naoki*; Mase, Atsushi*; Kogi, Yuichiro*; Tateishi, Naoyuki*; Seko, Noriaki; Tamada, Masao; Sakata, Eiji*

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 37, 2008/03

no abstracts in English

Journal Articles

Advanced fabrication method of planar components for plasma diagnostics

Ito, Naoki*; Mase, Atsushi*; Kogi, Yuichiro*; Seko, Noriaki; Tamada, Masao; Shen, Z.*; Yang, L.*; Domier, C. W.*; Luhmann, N. C. Jr.*; Sakata, Eiji*

Plasma and Fusion Research (Internet), 2, p.S1042_1 - S1042_4, 2007/11

As the importance of plasma imaging diagnostics increases, the fabrication of high performance millimeter-wave planar components becomes essential. This paper describes the development of high performance millimeter-wave planar components such as antennas and filters using low-loss fluorine substrate. The problems to be solved are low degree of adhesion between copper foil and fluorine substrate and shape of antenna pattern. In order to solve the problems, surface treatment of fluorine films and a fabrication method using Electro Fine Forming (EF2) are utilized.

Journal Articles

Report of meetings of ITPA (International Tokamak Physics Activity), 19

Sasao, Mamiko*; Kusama, Yoshinori; Kawano, Yasunori; Kawahata, Kazuo*; Mase, Atsushi*; Sugie, Tatsuo; Fujita, Takaaki; Fukuda, Takeshi*; Fukuyama, Atsushi*; Sakamoto, Yoshiteru; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 83(9), p.779 - 782, 2007/09

This is a report of highlights from 2007 spring meetings of seven Topical Groups (TG) of International Tokamak Physics Activity (ITPA). In each meeting, high priority issues in physics of International Thermonuclear Experimental Reactor (ITER) and other burning plasma experiments have been discussed and investigated. Twenty-seven scientists from Japan have participated in those meetings. Dates and places of the meetings are shown below. (1) Diagnostics TG: 26-30 March, Princeton (USA), (2) Transport Physics TG: 7-10 May, Lausanne (Switzerland), (3) Confinement Database and Modeling TG: 7-10 May, Lausanne (Switzerland), (4) Edge Pedestal Physics TG: 7-10 May, Garching (Germany) (5) Steady State Operation TG: 9-11 May, Daejeon (South Korea), (6)MHD TG: 21-24 May, San Diego (USA), (7) Scrape-off-layer and Divertor Physics TG: 7-10 May, Garching (Germany).

Journal Articles

Progress in microwave diagnostics and physics issues in magnetically confined plasmas

Mase, Atsushi*; Kogi, Yuichiro*; Hojo, Hitoshi*; Yoshikawa, Masayuki*; Itakura, Akiyoshi*; Chujo, T.*; Tokuzawa, Tokihiko*; Kawahata, Kazuo*; Nagayama, Yoshio*; Oyama, Naoyuki; et al.

Fusion Science and Technology, 51(2T), p.52 - 57, 2007/02

 Times Cited Count:3 Percentile:26.87(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Advanced diagnostics for burning plasma experiments

Sasao, Mamiko*; Yamada, Hiroshi*; Baba, Mamoru*; Kondoh, Takashi; Peterson, B. J.*; Kawahata, Kazuo*; Mase, Atsushi*; Yoshikawa, Masayuki*; Azechi, Hiroshi*; Toi, Kazuo*; et al.

Fusion Science and Technology, 51(2T), p.40 - 45, 2007/02

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

Several unexplored physics issues will be studied in burning plasma experiments, planned on ITER in the near future. To carry out these studies, it is essential to develop novel diagnostic systems, such as fusion product measurement systems and high-resolution, high-reliability profile measurement of various plasma parameters. Scientific research on "Advanced Diagnostics for Burning Plasma Experiment" was assigned as a priority area by MEXT in 2004, and more than 20 studies are currently underway under this program. The feasibility of several new diagnostic concepts applicable to ITER is examined and diagnostic components for these systems are now under development.

Journal Articles

Report on ITPA (International Tokamak Physics Activity) meeting, 18

Kawahata, Kazuo*; Kawano, Yasunori; Kusama, Yoshinori; Mase, Atsushi*; Sasao, Mamiko*; Sugie, Tatsuo; Fujita, Takaaki; Fukuda, Takeshi*; Fukuyama, Atsushi*; Sakamoto, Yoshiteru; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 83(2), p.195 - 198, 2007/02

no abstracts in English

Journal Articles

Surface treatment of poly(tetrafluoroethylene) and perfluoroethylene-propylene by radiation grafting

Ito, Naoki*; Mase, Atsushi*; Seko, Noriaki; Tamada, Masao; Sakata, Eiji*; Kogi, Yuichiro*

Japanese Journal of Applied Physics, Part 1, 45(12), p.9244 - 9246, 2006/12

 Times Cited Count:4 Percentile:17.99(Physics, Applied)

Polytetrafluoroethylene (PTFE) and perfluoro ethylene-propylene (PFEP) have many desirable properties for application to electronic devices, such as low dielectric constant and loss tangent. However, the weak adhesion of the polymer to various metals, associated with the chemical inertness of the fluorine resin surface, fails to satisfy many of the industry requirements. Surface treatment of PTFE and PFEP by radiation-induced graft polymerization was carried out to improve the adhesion. Peel adhesion strengths of 10.3 N/cm and 14.5 N/cm were attained for PTFE/Cu and PFEP/Cu, respectively by the treatment. In addition, the dielectric function of grafted PTFE and grafted PFEP remained almost unchanged after the graft polymerization.

Journal Articles

Development of low-loss millimeter-wave antennas on fluorine substrate using electro-fine-forming fabrication

Ito, Naoki*; Mase, Atsushi*; Seko, Noriaki; Tamada, Masao; Sakata, Eiji*; Kogi, Yuichiro*

Proceedings of Asia-Pacific Microwave Conference 2006 (APMC 2006), Vol.1 (CD-ROM), p.2031 - 2033, 2006/12

Polytetrafluoroethylene (PTFE) has many desirable properties for substrates of millimeter-wave planar antennas such as low dielectric constant and loss tangent. However, it has weak adhesion to various metals. Surface treatment of PTFE via radiation-induced graft polymerization was carried out to improve the adhesion. The peel adhesion strength of the PTFE/Cu was attained to be 10.3 N/cm by the treatment. The dielectric function of grafted-PTFE remained almost unchanged after the graft polymerization. The design and fabrication of millimeter-wave antennas on the treated PTFE substrates have been performed using electro-fine-forming (EF2) technology.

Journal Articles

Report of ITPA (International Tokamak Physics Activity) meetings, 17

Asakura, Nobuyuki; Kato, Takako*; Nakano, Tomohide; Takamura, Shuichi*; Tanabe, Tetsuo*; Iio, Shunji*; Nakajima, Noriyoshi*; Ono, Yasushi*; Ozeki, Takahisa; Takechi, Manabu; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 82(7), p.448 - 450, 2006/07

no abstracts in English

41 (Records 1-20 displayed on this page)