Real-time processing system of a two-color CO2 laser interferometer for density feedback control in JT-60SA

被引：7

作者：

Ohtani, Y. ^{[1
]}

Sasao, H. ^{[1
]}

Nakano, T. ^{[1
]}

Fukumoto, M. ^{[1
]}

Wakatsuki, T. ^{[1
]}

Inoue, S. ^{[1
]}

Kojima, S. ^{[1
]}

Urano, H. ^{[1
]}

Yoshida, M. ^{[1
]}

机构：

[1] Natl Inst Quantum Sci & Technol, Naka Inst Fus Sci & Technol, Naka, Ibaraki 3110193, Japan

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2024年 / 95卷 / 07期

关键词：

Carbon dioxide - Carbon dioxide lasers - Interferometers - Laser interferometry;

D O I：

10.1063/5.0215877

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A real-time processing system for the two-color CO2 laser interferometer on the JT-60SA has been developed for density feedback control. The system has a novel feature that can detect fringe jumps due to off-normal events, such as loss detection due to displacement of the beam axis and changes in the laser wavelengths. Because a phase change due to the JT-60SA plasma is smaller than pi/2, corresponding to the line-integral electron density N-L of similar to 6x10(19) m(-2) in a short interval of 500 ns, the threshold of the fringe jump detection is decided to be pi/2. Hence, off-normal events can be detected from a fringe jump, leading to the abort of the real-time feedback control. In the density feedback control of the JT-60SA plasma, the system is employed as a density monitor, with N-L being successfully controlled at 16.8% +/- 6.6% lower than the reference.

引用

页数：6

共 10 条

[1]

[Anonymous], About Us

[2]

[Anonymous], 1959, IRE Trans. Electr. Comput.

[3] Plasma density control in real-time on the COMPASS tokamak [J].

Janky, F. ;

Hron, M. ;

Havlicek, J. ;

Varavin, M. ;

Zacek, F. ;

Seidl, J. ;

Panek, R. .

FUSION ENGINEERING AND DESIGN, 2015, 96-97 :637-640

[4]

jt60sa, about us

[5] High power experiment and heat load evaluation of transmission line for the ECH/CD system in JT-60SA [J].

Kobayashi, T. ;

Yamazaki, H. ;

Hiranai, S. ;

Sawahata, M. ;

Terakado, M. ;

Ishita, K. ;

Hinata, J. ;

Sato, F. ;

Wada, K. ;

Ikeda, R. ;

Shinya, T. ;

Yajima, S. ;

Kajiwara, K. ;

Takahashi, K. ;

Moriyama, S. .

FUSION ENGINEERING AND DESIGN, 2022, 175

[6] A Flexible Pellet Injection System for the Tokamak JT-60SA: The Final Conceptual Design [J].

Lang, P. T. ;

Nakano, T. ;

Garzotti, L. ;

Pegourie, B. ;

Ploeckl, B. ;

Sakurai, S. .

FUSION SCIENCE AND TECHNOLOGY, 2019, 75 (03) :178-196

[7] Feedback controlled, reactor relevant, high-density, high-confinement scenarios at ASDEX Upgrade [J].

Lang, P. T. ;

Blanken, T. C. ;

Dunne, M. ;

McDermott, R. M. ;

Wolfrum, E. ;

Bobkov, V. ;

Felici, F. ;

Fischer, R. ;

Janky, F. ;

Kallenbach, A. ;

Kardaun, O. ;

Kudlacek, O. ;

Mertens, V. ;

Mlynek, A. ;

Ploeckl, B. ;

Stober, J. K. ;

Treutterer, W. ;

Zohm, H. .

NUCLEAR FUSION, 2018, 58 (03)

[8] Conceptual design and demonstration of a three-color laser interferometer for noise reduction in fusion plasma measurements [J].

Ohtani, Y. ;

Imazawa, R. .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2023, 94 (01)

[9] Real-time density feedback control in ADITYA-U Tokamak [J].

Patel, K. ;

Nagora, U. C. ;

Joshi, H. C. ;

Pathak, S. K. ;

Jadeja, K. A. ;

Patel, K. M. ;

Virani, C. ;

Patel, A. ;

Tanna, R. L. ;

Kumar, R. ;

Aich, S. ;

Ghosh, J. .

JOURNAL OF INSTRUMENTATION, 2022, 17 (06)

[10]

Sasao H., 2024, Rev. Sci. Instrum, p(submitt

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