caa a22 4500 477123112 CHVBK 20180405111642.0 cr unu---uuuuu 170330e19970101xx s 000 0 eng 10.1007/BF02677895 doi (NATIONALLICENCE)springer-10.1007/BF02677895 Coupling of tilting Gaussian beam with hybrid mode in the corrugated waveguide [Elektronische Daten] [K. Ohkubo, S. Kubo, H. Idei, M. Sato, T. Shimozuma, Y. Takita] The mode-conversion loss in the matching between the gaussian beam emanated from the gyrotron and the hybrid mode in the circular corrugated waveguide with the diameter of 2a is discussed. By numerical calculation, it is found that the loss considerably increases and optimum waist sizew 0 changes when TEM00 mode with the wavelength λ is injected with offset or tilt. By fitting numerical data to the polynomial function, it becomes evident that the scaling formulas of the losses for the off-axis shiftr d and for the tilt angle θ are derived to be 2.3(r d /a)2 - 2.2(r d /a)4 and 3.9(aα/λ)2 - 5.6(aθ/λ)4 for fixedw 0/a=0.643, respectively. To keep the mode-conversion loss ≤1% for the frequency of 168 GHz and 2a=88.9 mm, tilting angle and offset should be less than 0.1 degrees and 2.9 mm, respectively. Plenum Publishing Corporation, 1997 guassian beam nationallicence hybrid mode nationallicence HE11 mode nationallicence corrugated wave guide nationallicence coupling nationallicence gyrotron nationallicence electron cyclotron heating nationallicence Ohkubo K. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut Kubo S. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut Idei H. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut Sato M. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut Shimozuma T. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut Takita Y. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/1(1997-01-01), 23-41 0195-9271 18:1<23 1997 18 10762 https://doi.org/10.1007/BF02677895 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02677895 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ohkubo K. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut NATIONALLICENCE 700 1- Kubo S. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut NATIONALLICENCE 700 1- Idei H. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut NATIONALLICENCE 700 1- Sato M. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut NATIONALLICENCE 700 1- Shimozuma T. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut NATIONALLICENCE 700 1- Takita Y. National Institute for Fusion Science, Furo-cho, Chikusa-ku, 461-01, Nagoya, Japan aut NATIONALLICENCE 773 0- International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/1(1997-01-01), 23-41 0195-9271 18:1<23 1997 18 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 317903411 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer