New Frequency Step-Tunable Ecrh System for Asdex Upgrade

Wágner, D.; Leuterer, F.; Manini, A.; Monaco, F.; Münich, M.; Ryter, F.; Schütz, H.; Zohm, H.; Franke, Thomas; Heidinger, R.; Thumm, M.; Kasparek, W.; Gantenbein, G.; Litvak, A. G.; Popov, L. G.; Nichiporenko, V. O.; Myasnikov, V.E.; Денисов, Г. Г.; Tai, E. M.; Solyanova, E.A.; Malygin, S. A.

doi:10.1007/s10762-006-9021-y

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…The latter have demonstrated, e.g. 0.73 MW at 105 GHz and 0.94 MW at 140 GHz, respectively, in 10 s pulses [42]. An ITER gyrotron would work at 170 and 136 GHz, once designed for two frequency operations.…”

Section: Multi-frequency Gyrotronsmentioning

confidence: 99%

Steady state ECRH for next step superconducting fusion devices

Erckmann

2009

Fusion Engineering and Design

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a b s t r a c tControlled plasma start-up, heating towards thermonuclear fusion temperatures and steady state discharge control in advanced configurations is a major challenge for both, stellarators and tokamaks. Electron Cyclotron Resonance Heating (ECRH) and current drive (ECCD) plays a key role in the steady state operation scenarios of the ITER and JT-60 SA tokamaks as well as for the W7-X stellarator. The physics demands as well as the key technology of the different ECRH-systems, which are similar in frequency and have continuous wave (cw) capability, are presented. Advanced solutions for future ECRH-systems are discussed.

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Section: Multi-frequency Gyrotronsmentioning

confidence: 99%

Steady state ECRH for next step superconducting fusion devices

Erckmann

2009

Fusion Engineering and Design

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“…Such a universal polarizer can provide any arbitrary polarization in the output beam of the transmission line. In quasi-optical transmission lines, these polarizers can be made large [4,5], but polarizers in miter bends of HE11 transmission lines have a limited diameter and thus a very high incident power density. With increasing power and pulse length, the ohmic loss of the polarizer mirrors cannot be neglected anymore.…”

Section: Introductionmentioning

confidence: 99%

Minimization of the Ohmic Loss of Grooved Polarizer Mirrors in High-Power ECRH Systems

Wágner

Leuterer

Kasparek

et al. 2016

J Infrared Milli Terahz Waves

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A set of two corrugated polarizer mirrors is typically used in high-power electron cyclotron resonance heating (ECRH) systems to provide the required polarization of the ECRH output beam. The ohmic losses of these mirrors can significantly exceed the losses of plane mirrors depending on the polarization of the incident beam with respect to the orientation of the grooves. Since polarizer mirrors incorporated into miter bends of a corrugated waveguide line are limited in size, active water cooling can become critical in highpower cw systems like the one for ITER. The ohmic loss of polarizer mirrors has been investigated experimentally at high power. A strategy to minimize the losses for given mirror geometries has been found.

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“…[4][5][6] In a simplified picture, the electric field component parallel to the a) Electronic mail: leip@fysik.dtu.dk grooves is reflected off the top of the grooves, and the electric field component perpendicular to the grooves is reflected off the bottom of the grooves. This causes a phase shift between the two components that depends on the depth of the grooves.…”

Section: Introductionmentioning

confidence: 99%

Polarizer design for millimeter-wave plasma diagnostics

Leipold

Salewski

Jacobsen

et al. 2013

Review of Scientific Instruments

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Radiation from magnetized plasmas is in general elliptically polarized. In order to convert the elliptical polarization to linear polarization, mirrors with grooved surfaces are currently employed in our collective Thomson scattering diagnostic at ASDEX Upgrade. If these mirrors can be substituted by birefringent windows, the microwave receivers can be designed to be more compact at lower cost. Sapphire windows (a-cut) as well as grooved high density polyethylene windows can serve this purpose. The sapphire window can be designed such that the calculated transmission of the wave energy is better than 99%, and that of the high density polyethylene can be better than 97%.

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New Frequency Step-Tunable Ecrh System for Asdex Upgrade

Cited by 11 publications

References 6 publications

Steady state ECRH for next step superconducting fusion devices

Steady state ECRH for next step superconducting fusion devices

Minimization of the Ohmic Loss of Grooved Polarizer Mirrors in High-Power ECRH Systems

Polarizer design for millimeter-wave plasma diagnostics

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