Tests and developments of a long-pulse high-power 170 GHz absorbing matched load

Bin, W.; Bruschi, A.; Fanale, F.; Francesca, M.; Lucca, F.; Albajar, F.; Alberti, S.; Carannante, G.; Cavinato, M.; Chelis, Ioannis; Dell’Era, F.; Fasel, D.; Gantenbein, G.; Goodman, T.; Granucci, G.; Hogge, J.‐P.; Ikeda, Ryosuke; Ioannidis, Zisis C.; Legrand, François; Mellera, V.; Minelli, D.; Nardone, A.; Pagonakis, Ioannis Gr.; Rispoli, N.; Rzesnicki, T.; Sánchez, F.; Spinicchia, N.; Takahashi, Koji; Tigelis, I. G.; Viganò, F.

doi:10.1016/j.fusengdes.2018.11.019

Cited by 7 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the frequency applied is 170 GHz due to the collaboration with the International Thermonuclear Experimental Reactor (ITER), whose purpose was to find possible beam dumps for the first plasma experiment [3]. This frequency also predetermines the thickness range of the samples.…”

Section: Introductionmentioning

confidence: 99%

Resonant Atmospheric Plasma-Sprayed Ceramic Layers Effectively absorb Microwaves at 170 GHz

Hentrich

Garcia

Killinger

et al. 2022

J Infrared Milli Terahz Waves

View full text Add to dashboard Cite

Microwave absorbing layer materials (MALMs) are extremely important for many components in fusion reactors to absorb microwave radiation in a controlled manner and with predictable power density. Therefore, a detailed knowledge of absorption properties of absorber coating materials used is necessary. Plasma-sprayed mixed oxide coatings are most commonly used in those applications where moderate power density is expected. In this paper, a plane wave absorption model is presented using refractive index and absorption coefficient as internal parameters and incidence angle, polarization, and layer thickness as external parameters. The model has been calculated assuming radiation of 170 GHz, as envisaged for the ITER research facility. Three atmospheric plasma-sprayed coating materials were considered in this work: titanium dioxide (TiO2), chromium oxide (Cr2O3), and a mixed aluminum-titanium oxide Al2O3-TiO2 (40/60). Theoretical results are compared with free wave measurements with two antennas. Different coating thicknesses have been prepared and measured in different polarization and incidence angles. Results are discussed regarding polarization, incidence angle, layer thickness, absorption coefficient, and refractive index.

show abstract

Section: Introductionmentioning

confidence: 99%

Resonant Atmospheric Plasma-Sprayed Ceramic Layers Effectively absorb Microwaves at 170 GHz

Hentrich

Garcia

Killinger

et al. 2022

J Infrared Milli Terahz Waves

View full text Add to dashboard Cite

show abstract

“…It can be T.P. Goodman 1 , S. Alberti 1 , J. Genoud 1 , H. Torreblanca 1 , F. Albajar 2 , F. Sanchez 2 , A. Leggieri 3 seen that the parameters reach a quasi-steady state ca. 50s after the start of the pulse.…”

Section: Resultsmentioning

confidence: 99%

“…The electron beam is precisely aligned with dipole coils at KIT and with an XY-Table at SPC. The main differences lie in the testing configuration which at SPC incorporates an evacuated RF-Conditioning Unit (RFCU) and a ~10 m, φ63.5 mm HE11 transmission line (TL, φ50 mm in ITER) including 2 miter bends that propagates the microwave power to the spherical load developed by CNR [3]. The TL is cooled with Cu clamps periodically spaced by ca.…”

Section: Introductionmentioning

confidence: 99%

Tests and Qualification of the European 1 MW, 170 GHz CW Gyrotron in an ITER relevant configuration at SPC

Goodman¹,

Alberti²,

J.³

et al. 2022

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

Self Cite

View full text Add to dashboard Cite

“…Each of the two gyrotron towers houses a 1MW-class ITER-like gyrotron operating at 170GHz. An evacuated, 8.534m-long, 63.5mm-inner-diameter, Al TL with 2 MBs, manufactured by General Atomics (GA), connects the MOU of a Thales Electron Devices (TED) gyrotron [19,20] to a spherical load developed by IFP-CNR [21] to allow long-pulse (1000s), high-power testing (950kW demonstrated) . This is the so-called EU TL; it is 1.9m off of the false floor of the testing area.…”

Section: Measurement Layoutmentioning

confidence: 99%

High power mm-wave loss measurements of ITER ex-vessel waveguide components at the FALCON test facility at the Swiss Plasma Center

Goodman

Torreblanca²,

Borderas³

et al. 2023

EPJ Web Conf.

View full text Add to dashboard Cite

Many future fusion devices will rely heavily, if not solely, on electron cyclotron (EC) heating subsystems to provide bulk heating, instability control (neoclassical tearing mode (NTM) stabilization), and thermal instability control. Efficient use of the installed heating power (gyrotrons) requires low-loss transmission of the power over 100s of meters since the mm-wave sources need to be installed where the stray magnetic field has a small amplitude. Transmission lines are used to propagate the mm-wave power over this long distance. Quasi-optical techniques (mirrors) are used at W7X and are planned for DTT, for example. Guided components are installed at DIII-D, TCV and elsewhere and are planned at JT60SA and ITER. High power test facilities exist to evaluate the power transmission of assemblies of guided components (transmission lines). The European test facility FALCON was setup by Switzerland and Fusion for Energy (F4E) in Lausanne Switzerland at the Swiss Plasma Center (SPC) in the Ecole Polytechnique Fédérale de Lausanne (EPFL). Operations are funded through a framework contract with F4E. SPC operates the facility. Two ITER-class 170GHz gyrotrons are housed within the facility and used to evaluate the thermal behaviour of components provided by various ITER partners. Loss measurements are presented for miter bends and waveguides of several materials at two different diameters. The results are used to model the expected losses in the ITER ex-vessel waveguides (EW) of all five EC launchers.

show abstract

Tests and developments of a long-pulse high-power 170 GHz absorbing matched load

Cited by 7 publications

References 11 publications

Resonant Atmospheric Plasma-Sprayed Ceramic Layers Effectively absorb Microwaves at 170 GHz

Resonant Atmospheric Plasma-Sprayed Ceramic Layers Effectively absorb Microwaves at 170 GHz

Tests and Qualification of the European 1 MW, 170 GHz CW Gyrotron in an ITER relevant configuration at SPC

High power mm-wave loss measurements of ITER ex-vessel waveguide components at the FALCON test facility at the Swiss Plasma Center

Contact Info

Product

Resources

About