title: Induction heating pure vapor source of high temperature melting point materials on electron cyclotron resonance ion source.
abstract: Multicharged ions that are needed are produced from solid pure material with high melting point in an electron cyclotron resonance ion source. We develop an evaporator by using induction heating (IH) with multilayer induction coil, which is made from bare molybdenum or tungsten wire without water cooling and surrounding the pure vaporized material. We optimize the shapes of induction coil and vaporized materials and operation of rf power supply. We conduct experiment to investigate the reproducibility and stability in the operation and heating efficiency. IH evaporator produces pure material vapor because materials directly heated by eddy currents have no contact with insulated materials, which are usually impurity gas sources. The power and the frequency of the induction currents range from 100 to 900 W and from 48 to 23 kHz, respectively. The working pressure is about 10(-4)-10(-3) Pa. We measure the temperature of the vaporized materials with different shapes, and compare them with the result of modeling. We estimate the efficiency of the IH vapor source. We are aiming at the evaporator's higher melting point material than that of iron.
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita-shi, Osaka 565-0871, Japan. kutsumi@i-beam.jp
authors.forename: Osamu
authors.initials: O
authors.lastname: Kutsumi
authors.forename: Yushi
authors.initials: Y
authors.lastname: Kato
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Matsui
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kitagawa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Muramatsu
authors.forename: Takashi
authors.initials: T
authors.lastname: Uchida
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Fuminobu
authors.initials: F
authors.lastname: Sato
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Iida
mesh_terms: D017357:Cyclotrons; D004553:Electric Conductivity; D004583:Electrons; D006358:Hot Temperature; D008962:Models, Theoretical; D044366:Transition Temperature