Present Status of the New Multifrequency ECRH System for ASDEX Upgrade

Wágner, D.; Grunwald, Gerhard; Leuterer, F.; Manini, A.; Monaco, F.; Münich, M.; Schütz, H.; Stöber, J.; Zohm, H.; Franke, Thomas; Thumm, M.; Heidinger, R.; Gantenbein, G.; Meier, Andreas; Kasparek, W.; Lechte, C.; Litvak, A. G.; Денисов, Г. Г.; Чирков, А. В.; Tai, E. M.; Popov, L. G.; Nichiporenko, V. O.; Myasnikov, V.E.; Solyanova, E.A.; Malygin, S. A.; Méo, F.; Woskov, P.

doi:10.1109/tps.2008.917514

Cited by 19 publications

(18 citation statements)

References 13 publications

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“…In the present work the full capabilities of the CTS system have not yet been fully exploited: the signal-to-noise ratio has been increased at the expense of time resolution. In future experiments it may be possible to inject higher gyrotron powers [52] which may improve the signal-to-noise ratio and thus enable us to increase the time resolution. This may allow detailed studies of plasma dynamics on millisecond time scales by CTS -the results of which may be interesting to compare with numerical simulations.…”

Section: Discussionmentioning

confidence: 99%

Comparison of fast ion collective Thomson scattering measurements at ASDEX Upgrade with numerical simulations

Salewski¹,

Méo²,

Stejner³

et al. 2010

Nucl. Fusion

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100

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Abstract. Collective Thomson scattering (CTS) experiments were carried out at ASDEX Upgrade to measure the one-dimensional velocity distribution functions of fast ion populations. These measurements are compared with simulations using the codes TRANSP/NUBEAM and ASCOT for two different neutral beam injection (NBI) configurations: two NBI sources and only one NBI source. The measured CTS spectra as well as the inferred one-dimensional fast ion velocity distribution functions are clearly asymmetric as a consequence of the anisotropy of the beam ion populations and the selected geometry of the experiment. As expected, the one-beam configuration can clearly be distinguished from the two-beam configuration. The fast ion population is smaller and the asymmetry is less pronounced for the one-beam configuration. Salient features of the numerical simulation results agree with the CTS measurements while quantitative discrepancies in absolute values and gradients are found.

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Section: Discussionmentioning

confidence: 99%

Comparison of fast ion collective Thomson scattering measurements at ASDEX Upgrade with numerical simulations

Salewski¹,

Méo²,

Stejner³

et al. 2010

Nucl. Fusion

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100

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“…2 transmission line described in detail in Ref. 9. The ECRH antennae are steerable enabling the possibility of different scattering geometries.…”

Section: The Cts At Asdex Upgrade Hardwarementioning

confidence: 99%

“…7,8 The microwave based fast CTS diagnostic installed on AS-DEX Upgrade ͑CTS-AUG͒ uses millimeter waves generated by the newly installed 1 MW dual frequency gyrotron as probing radiation at 105 GHz. 9 This paper will include a brief overview of the hardware in Sec. II and the diagnostic capability in Sec.…”

Section: Introductionmentioning

confidence: 99%

Commissioning activities and first results from the collective Thomson scattering diagnostic on ASDEX Upgrade (invited)

Méo

Bindslev

Korsholm

et al. 2008

Review of Scientific Instruments

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The collective Thomson scattering ͑CTS͒ diagnostic installed on ASDEX Upgrade uses millimeter waves generated by the newly installed 1 MW dual frequency gyrotron as probing radiation at 105 GHz. It measures backscattered radiation with a heterodyne receiver having 50 channels ͑between 100 and 110 GHz͒ to resolve the one-dimensional velocity distribution of the confined fast ions. The steerable antennas will allow different scattering geometries to fully explore the anisotropic fast ion distributions at different spatial locations. This paper covers the capabilities and operational limits of the diagnostic. It then describes the commissioning activities carried out to date. These activities include gyrotron studies, transmission line alignment, and beam pattern measurements in the vacuum vessel. Overlap experiments in near perpendicular and near parallel have confirmed the successful alignment of the system. First results in near perpendicular of scattered spectra in a neutral beam injection ͑NBI͒ and ion cyclotron resonance heating ͑ICRH͒ plasma ͑minority hydrogen͒ on ASDEX Upgrade have shown evidence of ICRH heating phase of hydrogen.

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“…Accompanied by the magnetic field of the reactors, the ECRH frequency of ITER and JT-60SA is 170 GHz [2,3] and 110 / 137 GHz [4,5], respectively. Other than ITER and JT-60SA, many devices employ the ECRH system and have individual gyrotron frequency tied to long term R&D. Additionally, a dual frequency gyrotron have been studied for a future advanced ECRH system [6,7]. On the other hand, the frequency range is limited due to the gyrotron market for industries.…”

Section: Introductionmentioning

confidence: 99%

Development of Full D-Band Corrugated Horn Antenna for ECRH System

Sakaguchi

Idei

Tetsuji

et al. 2013

Plasma and Fusion Research

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The corrugated horn antenna is widely used for the evaluation of transmission lines in electron cyclotron resonant heating systems, but little is known about the intensity and phase of its radiation profile over a wide frequency range. This paper is concerned with the development of a full D-band (110 -170 GHz) corrugated horn antenna. The antenna was designed based on electromagnetic simulation codes for the finite element method and the method of moment. To verify these numerical simulations, a low-power test system was established, and its dynamic power range was defined for the precise measurement of antenna radiation. The fabricated antenna was measured and analyzed with basic Gaussian optics for a number of frequencies throughout the D-band. The measured radiation profiles are Gaussian-like and agree well with the numerical simulations. The radiated intensity pattern is slightly elliptical in the lower frequency range, as unwanted higher-order modes arose at the corrugated mode conversion section and generated the elliptical radiation pattern. The evolutions of the antenna radiation do not correspond with those expected by basic Gaussian optics.

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Present Status of the New Multifrequency ECRH System for ASDEX Upgrade

Cited by 19 publications

References 13 publications

Comparison of fast ion collective Thomson scattering measurements at ASDEX Upgrade with numerical simulations

Comparison of fast ion collective Thomson scattering measurements at ASDEX Upgrade with numerical simulations

Commissioning activities and first results from the collective Thomson scattering diagnostic on ASDEX Upgrade (invited)

Development of Full D-Band Corrugated Horn Antenna for ECRH System

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