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ALMA BAND 8 CONTINUUM EMISSION FROM ORION SOURCE I
Hirota, Tomoya,Machida, Masahiro N.,Matsushita, Yuko,Motogi, Kazuhito,Matsumoto, Naoko,Kim, Mi Kyoung,Burns, Ross A.,Honma, Mareki American Astronomical Society 2016 The Astrophysical journal Vol.833 No.2
<P>We have measured continuum flux densities of a high-mass protostar candidate, a radio source. I in the Orion. KL region (Orion Source I) using the Atacama Large Millimeter/Submillimeter Array (ALMA) at band. 8 with an angular resolution of 0 ''.1. The continuum emission at 430, 460, and 490 GHz associated with Source. I shows an elongated structure along the northwest-southeast direction perpendicular to the so-called low-velocity bipolar outflow. The deconvolved size of the continuum source, 90 au x 20 au, is consistent with those reported previously at other millimeter/submillimeter wavelengths. The flux density can be well fitted to the optically thick blackbody spectral energy distribution, and the brightness temperature is evaluated to be 700-800 K. It is much lower than that in the case of proton-electron or H-free-free radiations. Our data are consistent with the latest ALMA results by Plambeck & Wright, in which the continuum emission was proposed to arise from the edge-on circumstellar disk via thermal dust emission, unless the continuum source consists of an unresolved structure with a smaller beam filling factor.</P>
High-Power ECRH Experiments in the GAMMA 10 Tandem Mirror
yoshinori Tatematsu,A. Itakura,D. Nagai,H. Higaki,H. Hojo,I. Katanuma,J. Kohagura,K. Nozaki,K. Sakamotoa,K. Ishii,M. Ichimura,M. Yoshikawa,M. Hirata,M. K. Islam,N. Machida,O. Watanabe,T. Imai,T. Numak 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Power-up of gyrotrons was carried out and corresponding launcher systems were designed for plug and central-cell ECRH systems in the GAMMA 10 tandem mirror. Then, a high-power ECRH experiment was started. For the plug ECRH, new 500-kW gyrotrons produced a new record value of the confining potential. For the central-cell ECRH, development of a new antenna system has increased the transmission rate of incident microwave power and focused it onto the machine axis in the resonance surface. As a result, a clear increase of the diamagnetism was observed during the pulse of ECRH.