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論文

Repetitive gyrotron operation for ITER

梶原 健; 小田 靖久; 春日井 敦; 高橋 幸司; 坂本 慶司; Darbos, C.*; Henderson, M. A.*

Fusion Engineering and Design, 86(6-8), p.955 - 958, 2011/10

 被引用回数:9 パーセンタイル:57.2(Nuclear Science & Technology)

A repetitive operation corresponding to ITER is performed 8 successive days. The pulse width is 600 sec and the interval is 20-30 min. The output power is 800 kW. The electrical efficiency including depressed collector is 53-57%. The total shots are 88 shots. The successful 600 s shots are 72 shots. Therefore, the gyrotron reliability is measured as 82%. Shot by shot stability of the voltage, current, power and frequency is measured. The successful of the stable 72 shots shows that the present gyrotron system can be utilized for ITER operation.

論文

Reliability test of the 170GHz gyrotron for ITER

梶原 健; 春日井 敦; 小田 靖久; 高橋 幸司; 坂本 慶司; Darbos, C.*; Henderson, M.*

Journal of Infrared, Millimeter, and Terahertz Waves, 32(3), p.329 - 336, 2011/03

 被引用回数:13 パーセンタイル:58.85(Engineering, Electrical & Electronic)

Using the ITER relevant 170 GHz gyrotron, the repetitive operation with long pulse and high power is conducted. The first consecutive days repetitive operation with ITER equivalent condition (800 kW/600 s with 20 min interval) is successfully performed in JAEA gyrotron test stand in order to obtain a basic data of the reliability of the current gyrotron system. The 72 shots out of 88 shots were successfully continued until the end of the pulse (600 s). The successful rate was 82%. The results demonstrate the feasibility of gyrotron operating at a high reliability for high power long pulse operation for ITER like conditions.

論文

Progress on the heating and current drive systems for ITER

Jacquinot, J.*; Albajar, F.*; Beaumont, B.*; Becoulet, A.*; Bonicelli, T.*; Bora, D.*; Campbell, D.*; Chakraborty, A.*; Darbos, C.*; Decamps, H.*; et al.

Fusion Engineering and Design, 84(2-6), p.125 - 130, 2009/06

 被引用回数:24 パーセンタイル:82.41(Nuclear Science & Technology)

ITER用電子サイクロトロン波(EC),イオンサイクロトロン波(IC),中性ビーム(NB)、そして低域混成波(LH)について、その物理と工学の両面の進展を2007/2008年にレビューした。全体仕様の変更はないものの、以下のような設計変更があった。第一に、DTフェーズの前に全パワーである73MW入射をルーティンに入射可能となるように調整すべきこと。第二に、NBを水素フェーズにもフルパワー入射が可能となるように対向壁を用意する、IC用によりロバスト名アンテナ2式を用意する、またECには2MW容量の伝送系を用意して、増力を容易にする。さらにRF源と計測及び加熱用ポートプラグの試験施設となる付属建屋を用意する。第三に、LHのようにITERの長パルス運転時に適した電流駆動システムを開発するための計画の必要性が認識された。

口頭

Reliability test of the ITER 170GHz gyrotron and development of the two-frequency gyrotron

梶原 健; 小田 靖久; 春日井 敦; 高橋 幸司; 坂本 慶司; Henderson, M.*; Darbos, C.*

no journal, , 

Reliability of the 170 GHz ITER gyrotron is tested in JAEA. The 800 kW/600 sec pulse with 52-57% efficiency is repeated with interval of 20 min in 8 days. The 72 shots of 600 sec were successfully achieved out of 88 shots. The success rate was 82%. It shows the realistic reliability for the gyrotron operation for ITER. The next step is a development of a multi frequency gyrotron. Preliminary test of the two-frequency gyrotron is performed. The 170 GHz and 136 GHz oscillations are successfully attained at short pulse (0.5 ms) and long pulse (10 sec). In the short pulse experiments, the maximum power of 1.3 MW is obtained for both frequencies.

口頭

Development of high power long pulse ITER gyrotron and ECRF technology

坂本 慶司; 梶原 健; 小田 靖久; 高橋 幸司; 林 一生; 小林 則幸*; Henderson, M.*; Darbos, C.*

no journal, , 

Recent progress on the development of a high power 170 GHz gyrotron obtained in Japan Atomic Energy Agency (JAEA) is presented. Main results are: (1) The repetitive operation of 800 kW/600 s with an interval of 20-30 min was performed. The electrical efficiency was 52-57% with the depressed collector. The 72 shots of 88 shots was very stable 600 s-oscillation. No damage was found on the gyrotron by this test. (2) The 5 kHz-full power modulation was demonstrated at CW mode. For this purpose, a full beam current modulation was realized by switching the anode voltage to minimized the collector heat load. (3) In the dual frequency gyrotron development, the 1.3 MW oscillations at 170 GHz and 136.8 GHz were successfully demonstrated by changing the cavity field and the anode voltage keeping other parameters constant. In addition, the status of the development of the transmission line components and ITER equatorial launcher will be presented.

口頭

Prototype development of the ITER EC system with 170 GHz gyrotron

小田 靖久; 梶原 健; 池田 亮介; 大島 克己; 林 一生*; 高橋 幸司; 坂本 慶司; Purohit, D.*; Gandini, F.*; 大森 俊道*; et al.

no journal, , 

To study the operational performance of ITER EC heating and current drive system (H&CD), a mock-up of the ITER mm wave system has been assembled using the high power long gyrotron test stand in JAEA. The prototype system is composed of the primary parts of the EC H&CD system, including: 170 GHz gyrotron, power supply, transmission line (TL) and mock-up of equatorial launcher (EL) and control system. The JAEA test stand is a flexible system with its center piece a frequency-step-tunable gyrotron at 170 GHz/137 GHz/104 GHz. The output beam is radiated to the identical direction from the output window for each frequency, consequently the power was transmitted to the end of the TL at these three frequencies. The system has achieved CW 5 kHz power switching, which demonstrates the compatibility for MHD control of ITER plasma. The modulation was achieved using a novel configuration of the electron beam acceleration power supply. In the experiment, stable 5 kHz of power modulation was demonstrated with minimized spurious frequency excitation at the ramp-up phase of each pulse which satisfied the ITER criteria.

口頭

Development of EC system components for steady state plasma operation

小田 靖久; 池田 亮介; 高橋 幸司; 梶原 健; 坂本 慶司; Gandini, F.*; Darbos, C.*; Purohit, D.*; Henderson, M.*

no journal, , 

For steady state plasma operation, EC H&CD system components, such as transmission line (TL), are required to be compliant with high power CW operation. One of issues of EC H&CD TL for steady state operation is the deformation of TL system due to thermal load by high power operation. The controllability of TL components during RF operation is another issue for steady state operation. In JAEA, ITER relevant TL was examined for long pulse operation up to 1,000 sec using a 170 GHz high power gyrotron.

口頭

Status of procurement of ITER JA gyrotron and final design of its operation system

小田 靖久; 池田 亮介; 大島 克己; 林 一生*; 高橋 幸司; 梶原 健; 小林 貴之; 森山 伸一; 坂本 慶司; Darbos, C.*; et al.

no journal, , 

The procurement arrangement (PA) of ITER JA gyrotron was signed in 2013 September. This PA includes 8 sets of gyrotron and its operation system to ITER site. Since start of PA, final design of gyrotron and its operation system was proceeded. The design work was reviewed in the final design review meeting in 2015 January. In this report, the design of gyrotron operation system will be presented.

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