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Schuberta M, Herrmann A, Monaco F, Rohde V, Schütz H, Stober J, Vierle T, Vorbrugg S, Wagner D, Zasche D, Zehetbauer T, Zeidner W. Machine safety issues with respect to the extension of ECRH systems at ASDEX Upgrade. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20158702010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Stober J, Barrera L, Behler K, Bock A, Buhler A, Eixenberger H, Giannone L, Kasparek W, Maraschek M, Mlynek A, Monaco F, Poli E, Rapson C, Reich M, Schubert M, Treutterer W, Wagner D, Zohm H. Feedback-controlled NTM stabilization on ASDEX Upgrade. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20158702017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Stober J, Sommer F, Angioni C, Bock A, Fable E, Leuterer F, Monaco F, Müller F, Münich S, Petzold B, Poli E, Schubert M, Schütz H, Wagner D, Zohm H, Kasparek W, Plaum B, Meier A, Scherer T, Strauß D, Jelonnek J, Thumm M, Litvak A, Denisov G, Chirkov A, Tai E, Popov L, Nichiporenko V, Myasnikov V, Soluyanova E, Malygin V. High power ECRH and ECCD in moderately collisional ASDEX Upgrade Hmodes and status of EC system upgrade. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20158702004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Okada K, Nishiura M, Kubo S, Shimozuma T, Yoshimura Y, Igami H, Takahashi H, Tanaka K, Kobayashi S, Ito S, Mizuno Y, Ogasawara S. Development of fast steering mirror control system for plasma heating and diagnostics. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E811. [PMID: 25430376 DOI: 10.1063/1.4891044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A control system for a fast steering mirror has been newly developed for the electron cyclotron heating (ECH) launchers in the large helical device. This system enables two-dimensional scan during a plasma discharge and provides a simple feedback control function. A board mounted with a field programmable gate array chip has been designed to realize feedback control of the ECH beam position to maintain higher electron temperature by ECH. The heating position is determined by a plasma diagnostic signal related to the electron temperature such as electron cyclotron emission and Thomson scattering.
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Affiliation(s)
- K Okada
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M Nishiura
- Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - S Kubo
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T Shimozuma
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y Yoshimura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - H Igami
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - H Takahashi
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K Tanaka
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S Kobayashi
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S Ito
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y Mizuno
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S Ogasawara
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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Stejner M, Nielsen S, Jacobsen AS, Korsholm SB, Leipold F, Meo F, Michelsen PK, Moseev D, Rasmussen J, Salewski M, Schubert M, Stober J, Wagner DH. Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:093504. [PMID: 25273723 DOI: 10.1063/1.4894199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Collective Thomson scattering (CTS) measurements provide information about the composition and velocity distribution of confined ion populations in fusion plasmas. The bulk ion part of the CTS spectrum is dominated by scattering off fluctuations driven by the motion of thermalized ion populations. It thus contains information about the ion temperature, rotation velocity, and plasma composition. To resolve the bulk ion region and access this information, we installed a fast acquisition system capable of sampling rates up to 12.5 GS/s in the CTS system at ASDEX Upgrade. CTS spectra with frequency resolution in the range of 1 MHz are then obtained through direct digitization and Fourier analysis of the CTS signal. We here describe the design, calibration, and operation of the fast receiver system and give examples of measured bulk ion CTS spectra showing the effects of changing ion temperature, rotation velocity, and plasma composition.
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Affiliation(s)
- M Stejner
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - S Nielsen
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - A S Jacobsen
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - S B Korsholm
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - F Leipold
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - F Meo
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - P K Michelsen
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - D Moseev
- Max-Planck-Institut für Plasmaphysik, EURATOM-Association, Boltzmannstr. 2, 85748 Garching, Germany
| | - J Rasmussen
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - M Salewski
- Department of Physics, Association EURATOM-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - M Schubert
- Max-Planck-Institut für Plasmaphysik, EURATOM-Association, Boltzmannstr. 2, 85748 Garching, Germany
| | - J Stober
- Max-Planck-Institut für Plasmaphysik, EURATOM-Association, Boltzmannstr. 2, 85748 Garching, Germany
| | - D H Wagner
- Max-Planck-Institut für Plasmaphysik, EURATOM-Association, Boltzmannstr. 2, 85748 Garching, Germany
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