2020
DOI: 10.2528/pierm19102302
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Oversized Circular Corrugated Waveguides Operated at 42 GHZ for Ecrh Application

Abstract: The design, analysis, and manufacturing of an oversized circular metallic corrugated waveguide with rectangular and square grooves for transmitting power from gyrotron to tokamak or dummy load have been carried out. To carry high power at millimeter wave with lower transmission loss, a corrugated waveguide is preferred. A corrugated waveguide with HE 11 mode gives lower attenuation than a smooth circular waveguide with TE 11 mode. The theory behind the depth and width selection of corrugations required to carr… Show more

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Cited by 4 publications
(5 citation statements)
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“…Poynting vector plots showed the typical power density near the out-port (at 50 GHz) to be ~50% of the central peak value at a radius ~0.38 a, and ~1% of the central value at a distance ~ λ /4 from the wall. Our attenuation results were quite close to those recently reported (0.11 dB/m for rectangular grooves) by another group [ 45 ] for simulations of a waveguide of the same ID at 42 GHz (except 0.5 m long) in contrast to the results reported by the ITER LFSR group.…”
Section: Length Effects In Simple Corrugated Omwgssupporting
confidence: 92%
“…Poynting vector plots showed the typical power density near the out-port (at 50 GHz) to be ~50% of the central peak value at a radius ~0.38 a, and ~1% of the central value at a distance ~ λ /4 from the wall. Our attenuation results were quite close to those recently reported (0.11 dB/m for rectangular grooves) by another group [ 45 ] for simulations of a waveguide of the same ID at 42 GHz (except 0.5 m long) in contrast to the results reported by the ITER LFSR group.…”
Section: Length Effects In Simple Corrugated Omwgssupporting
confidence: 92%
“…The schematic of the predicted loss having gap length (L) is shown in Figure 2. The HE 11 miter bend theory involves three types of losses: diffraction loss, ohmic loss, and misalignment loss [13,18]. These losses give the estimation of overall loss before the actual simulation of the component is carried out.…”
Section: 7mentioning
confidence: 99%
“…The schematic of the proposed model is shown in Figure 1. It is proven that the transmission of high-power at millimetre-wave with low loss is achieved with overmoded circular corrugated waveguide wall [11,18]. The proposed design is tricky as it incorporates a mode converter on one hand and up-taper on the other hand.…”
Section: Introductionmentioning
confidence: 99%
“…In transmission lines and waveguides, the possibility to decrease the Radio-Frequency (RF) resistive losses below the theoretical limit of usual copper losses, without making use of superconductors, is explored in the concept of corrugated waveguides 9 11 . In these waveguides, the resistive walls are modulated with periodic narrow-band structures (i.e.…”
Section: Introductionmentioning
confidence: 99%
“…In addition, the corrugation is intrinsically narrow-band and poses limitations on the operational frequency range 12 . Finally, the waveguide geometry is certainly more complex, and requires tight manufacturing tolerances for the fabrication at higher frequencies 9 – 12 .…”
Section: Introductionmentioning
confidence: 99%