We developed an electron cyclotron resonance ion source (ECRIS) for new materials production on nanoscale. Our main target is the endohedral fullerenes, which have potential in medical care, biotechnology, and nanotechnology. In particular, iron-encapsulated fullerene can be applied as a contrast material for magnetic resonance imaging or microwave heat therapy. Thus, our new ECRIS is named the Bio-Nano ECRIS. In this article, the recent progress of the development of the Bio-Nano ECRIS is reported: (i) iron ion beam production using induction heating oven and (ii) optimization of singly charged C(60) ion beam production.

Articles you may be interested inImproved efficiency and precise temperature control of low-frequency induction-heating pure iron vapor source on ECR ion source AIP Conf.Multicharged ion source based on Penning-type discharge with electron cyclotron resonance heating by millimeter wavesa) Rev. Sci. Instrum. 83, 02A325 (2012); 10.1063/1.3669793 Induction heating pure vapor source of high temperature melting point materials on electron cyclotron resonance ion sourcea) Rev. Sci. Instrum. 81, 02A322 (2010); 10.1063/1.3272830 Multicharged iron ions produced by using induction heating vapor sourcea) Rev. Sci. Instrum. 79, 02A312 (2008); 10.1063/1.2816708 High current density production of multicharged ions with ECR plasma heated by gyrotron transmitter Rev. Sci. Instrum. 73, 528 (2002);Multiply charged Fe ions are produced from solid material in a 2.45 GHz electron cyclotron resonance ͑ECR͒ ion source. We develop an evaporator by induction heating with an induction coil covered by ceramics in vacuum and surrounding the pure Fe rod with noncontact. The typical power and the frequency of the induction currents range from 300 to 800 W and from 30 to 40 kHz, respectively. The evaporator is inserted into the ECR plasma from the mirror endplate along the geometrical axis of the mirror field. Argon gas is usually chosen for supporting gas, and the working pressure is about 10 −4 -10 −3 Pa. The multicharged Fe ions are extracted from the opposite side of mirror and against the evaporator, and then multicharged Fe ion beam is formed. We compare the production of multicharged iron ions by using this source with our previous methods.

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Multiply charged Fe ions are produced from solid pure material in an electron cyclotron resonance (ECR) ion source. We develop an evaporator by using induction heating with an induction coil which is made of bare molybdenum wire partially covered by ceramic beads in vacuum and surrounding and heating directly the pure Fe rod. Heated material has no contact with insulators, so that outgas is minimized. The evaporator is installed around the mirror end plate outside of the ECR plasma with its hole grazing the ECR zone. Helium or argon gas is usually chosen for supporting gas. The multicharged Fe ions up to Fe(13+) are extracted from the opposite side of mirror and against the evaporator, and then multicharged Fe ion beam is formed. We compare production of multicharged iron ions by using this new source with our previous methods.

We are developing an ECRIS apparatus which is designed for the production of endohedral fullerenes. Our promising approaches to produce the endohedral fullerenes using the ECRIS are the ion-ion collision reaction of fullerenes and the other atom in their mixture plasma and simple ion implantation of atom into fullerene layer. In this study, we tried to synthesize the endohedral nitrogen-fullerenes by ion implantation. N + beam was irradiated to a fullerene target with a specific energy and dose. As a result, we could observe the peak of N+C 60 from targets after N + beam irradiation with TOF-SIMS and LDI-TOF-MS.