A Revised Iter Ec System Baseline Design Proposal

Henderson, M.; Beckett, B.; Darbos, C.; Kobayashi, N.; Saibene, G.; Albajar, F.; Bonicelli, T.; Alberti, S.; Chavan, R.; Fasel, D.; Goodman, T.P.; Pagonakis, Ioannis Gr.; Sauter, O.; Cirant, S.; Farina, D.; Ramponi, G.; Heidinger, R.; Piosczyk, B.; Thumm, M.; Rao, S.L.; Kajiwara, K.; Sakamoto, K.; Takahashi, Kaoru; Денисов, Г. Г.; Bigelow, T.; Rasmussen, D. A.

doi:10.1142/9789812814647_0065

Cited by 3 publications

(3 citation statements)

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“…An important application that is currently under development is the transmission line for the Electron Cyclotron Heating system for the ITER tokamak, which will have twenty-four one megawatt gyrotrons at 170 GHz. Each gyrotron will have a transmission line that is over one hundred meters long [10]. These transmission lines have been designed with a corrugation depth, d = λ/4, of 0.44 mm and a radius of a =31.75 mm, such that a/λ =18 [11].…”

Section: Introductionmentioning

confidence: 99%

Linearly Polarized Modes of a Corrugated Metallic Waveguide

Kowalski

Tax

Shapiro

et al. 2010

IEEE Trans. Microwave Theory Techn.

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Abstract-High power, high frequency microwave radiation can be transmitted with very low loss in oversized corrugated metallic waveguide. We derive a linearly polarized (LPmn) mode basis set for these waveguides for the special case of quarter wavelength depth corrugations. We also show the relationship between the LPmn modes and the conventional modes (HEmn, EHmn, TE0n, TM0n) of the corrugated guide. The loss in a gap or equivalent miter bend in the waveguide is calculated for single mode and multi-mode propagation on the line. In the latter case, it is shown that modes of the same symmetry interfere with one another, causing enhanced or reduced loss, depending on the relative phase of the modes. If two modes with azimuthal (m) indeces that differ by one propagate in the waveguide, the resultant centroid and the tilt angle of radiation at the guide end are shown to be related through a constant of the motion. These results should be useful in describing the propagation of high power, linearly polarized radiation in these overmoded, corrugated waveguides.

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Section: Introductionmentioning

confidence: 99%

Linearly Polarized Modes of a Corrugated Metallic Waveguide

Kowalski

Tax

Shapiro

et al. 2010

IEEE Trans. Microwave Theory Techn.

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“…The design of the ITER transmission line is still ongoing 3 . For the present calculations, our goal is an understanding of the role of HOMs in the power transmission and the mode conversion on the TL.…”

Section: Ib Representative Iter Transmission Line Componentsmentioning

confidence: 99%

“…Figure 1 is a schematic of the ECH/ECCD system of ITER 3 . The transmission line (TL) connects the gyrotron system to the ECH launcher (equatorial launcher and upper launchers) [4][5][6] .…”

Section: Introduction Ia Iter Ech/eccd Systemmentioning

confidence: 99%

Loss Estimate for ITER ECH Transmission Line Including Multimode Propagation

Shapiro

Kowalski

Sirigiri

et al. 2010

Fusion Science and Technology

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The ITER ECH Transmission Lines (TLs) are 63.5 mm diameter corrugated waveguides that will each carry 1 MW of power at 170 GHz with a transmission efficiency that should exceed 83%. The losses on the ITER TL have been calculated for four possible cases corresponding to having HE 11 mode purity at the input of the TL of 100%, 97%, 90% and 80%. The losses due to coupling, Ohmic and mode conversion loss are evaluated in detail using a numerical code and analytical approaches. Estimates of the calorimetric loss on the line show that the output power is reduced by about 5 ±1 % due to Ohmic loss in each of the four cases. Estimates of the mode conversion loss show that the fraction of output power in the HE 11 mode is about 3% smaller than the fraction of input power in the HE 11 mode. High output mode purity therefore can only be achieved with significantly higher input mode purity. Combining both Ohmic and mode conversion loss, for 1 MW of power generated by the gyrotron, the output power in the HE 11 mode at the end of the ITER TL can be roughly estimated in theory as 920 kW times the fraction of input power in the HE 11 mode.2

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