Dai Nozaki

Publications (3)4.56 Total impact

• Article: Dependence of ion beam current on position of mobile plate tuner in multi-frequencies microwaves electron cyclotron resonance ion source.

  Yosuke Kurisu, Ryutaro Kiriyama, Tomoya Takenaka, Dai Nozaki, Fuminobu Sato, Yushi Kato, Toshiyuki Iida
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  ABSTRACT: We are constructing a tandem-type electron cyclotron resonance ion source (ECRIS). The first stage of this can supply 2.45 GHz and 11-13 GHz microwaves to plasma chamber individually and simultaneously. We optimize the beam current I(FC) by the mobile plate tuner. The I(FC) is affected by the position of the mobile plate tuner in the chamber as like a circular cavity resonator. We aim to clarify the relation between the I(FC) and the ion saturation current in the ECRIS against the position of the mobile plate tuner. We obtained the result that the variation of the plasma density contributes largely to the variation of the I(FC) when we change the position of the mobile plate tuner.
  The Review of scientific instruments 02/2012; 83(2):02A310. · 1.52 Impact Factor
• Article: Electron cyclotron resonance plasma production by using pulse mode microwaves and dependences of ion beam current and plasma parameters on the pulse condition.

  Ryutaro Kiriyama, Tomoya Takenaka, Yousuke Kurisu, Dai Nozaki, Fuminobu Sato, Yushi Kato, Toshiyuki Iida
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  ABSTRACT: We measure the ion beam current and the plasma parameters by using the pulse mode microwave operation in the first stage of a tandem type ECRIS. The time averaged extracted ion beam current in the pulse mode operation is larger than that of the cw mode operation with the same averaged microwave power. The electron density n(e) in the pulse mode is higher and the electron temperature T(e) is lower than those of the cw mode operation. These plasma parameters are considered to cause in the increase of the ion beam current and are suitable to produce molecular or cluster ions.
  The Review of scientific instruments 02/2012; 83(2):02A324. · 1.52 Impact Factor
• Article: Profiles of ion beams and plasma parameters on a multi-frequencies microwaves large bore electron cyclotron resonance ion source with permanent magnets.

  Yushi Kato, Naoki Sakamoto, Ryutaro Kiriyama, Tomoya Takenaka, Yosuke Kurisu, Dai Nozaki, Fuminobu Sato, Toshiyuki Iida
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  ABSTRACT: In order to contribute to various applications of plasma and beams based on an electron cyclotron resonance, a new concept on magnetic field with all magnets on plasma production and confinement has been proposed with enhanced efficiency for broad and dense ion beam. The magnetic field configuration consists of a pair of comb-shaped magnet surrounding plasma chamber cylindrically. Resonance zones corresponding for 2.45 GHz and 11-13 GHz frequencies are positioned at spatially different positions. We launch simultaneously multiplex frequencies microwaves operated individually, try to control profiles of the plasma parameters and the extracted ion beams, and to measure them in detail.
  The Review of scientific instruments 02/2012; 83(2):02A317. · 1.52 Impact Factor