caa a22 4500 445305533 CHVBK 20180317142611.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10762-010-9720-2 doi (NATIONALLICENCE)springer-10.1007/s10762-010-9720-2 Experimental Results on a 1.5MW, 110GHz Gyrotron with a Smooth Mirror Mode Converter [Elektronische Daten] [David Tax, Eunmi Choi, Ivan Mastovsky, Jeffrey Neilson, Michael Shapiro, Jagadishwar Sirigiri, Richard Temkin, Antonio Torrezan] We present an internal mode converter (IMC) design for a 1.5MW, 110GHz gyrotron operating in the TE22,6 mode. The launcher, designed using the codes Surf3d and LOT, converts the cavity waveguide mode into a nearly pure Gaussian beam. The Gaussian beam output from the launcher is shaped by a series of 4 smooth, curved mirrors to provide a circular output beam with a flat phase front at the gyrotron window. By employing smooth mirrors rather than mirrors with phase correcting surfaces, such an IMC is less sensitive to alignment issues and can more reliably operate with high efficiency. The IMC performance was verified by both cold test and hot test experiments. Beam pattern measurements in each case were in good agreement with theoretical predictions. The output beam was of high quality with calculations showing that the Gaussian Beam content was 95.8 ± 0.5% in both hot and cold test. Springer Science+Business Media, LLC, 2010 Gyrotron nationallicence Internal mode converter nationallicence Gaussian beam nationallicence Efficiency nationallicence Tax David Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut Choi Eunmi Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut Mastovsky Ivan Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut Neilson Jeffrey Calabazas Creek Research Inc., 94404, San Mateo, CA, USA aut Shapiro Michael Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut Sirigiri Jagadishwar Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut Temkin Richard Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut Torrezan Antonio Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/3(2011-03-01), 358-370 1866-6892 32:3<358 2011 32 10762 https://doi.org/10.1007/s10762-010-9720-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-010-9720-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tax David Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Choi Eunmi Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Mastovsky Ivan Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Neilson Jeffrey Calabazas Creek Research Inc., 94404, San Mateo, CA, USA aut NATIONALLICENCE 700 1- Shapiro Michael Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Sirigiri Jagadishwar Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Temkin Richard Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Torrezan Antonio Plasma Science and Fusion Center, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/3(2011-03-01), 358-370 1866-6892 32:3<358 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer