Production of highly charged ions in the RIKEN 18 GHz ECR ion source using an electrode in two modes

S. Biri, T. Nakagawa, M. Kidera, Y. Miyazawa, M. Hemmi, T. Chiba, N. Inabe, M. Kase, T. Kageyama, O. Kamigaito, A. Goto, Y. Yano

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We placed an axially movable electrode into the plasma chamber of the 18 GHz RIKEN ECR ion source in order to produce higher intensity of multiply charged ions and to study how the electrode effects the highly charged ion (HCI) production. We found that the effect of the electrode strongly depends on the local plasma parameters, mainly on the electrode initial floating potential. At lower floating potential, we need to increase the plasma density by means of biasing the electrode and injecting electrons into the plasma. The electrode operates as an electron source (Electron Donor or ED mode). At higher floating potential, the electrode works by changing the plasma potential. The best result is obtained when the electrode remains at floating potential (Plasma Tuner or PT mode). These two modes were checked and successfully found both in the continuous and in the pulsed mode operation. In both (ED and PT) modes, we generated higher HCI currents than without the electrode. In the PT mode, we successfully obtained 300 eμA of Ar11+ at 15 kV extraction voltage.

Original languageEnglish
Pages (from-to)386-396
Number of pages11
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume152
Issue number2
DOIs
Publication statusPublished - May 1999

Fingerprint

Ion sources
ion sources
Ions
Electrodes
electrodes
floating
ions
Plasmas
plasma potentials
Electron sources
electron sources
Electrons
Plasma density
ion currents
plasma density
electrons
chambers
Electric potential
electric potential

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

Cite this

Production of highly charged ions in the RIKEN 18 GHz ECR ion source using an electrode in two modes. / Biri, S.; Nakagawa, T.; Kidera, M.; Miyazawa, Y.; Hemmi, M.; Chiba, T.; Inabe, N.; Kase, M.; Kageyama, T.; Kamigaito, O.; Goto, A.; Yano, Y.

In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 152, No. 2, 05.1999, p. 386-396.

Research output: Contribution to journalArticle

Biri, S. ; Nakagawa, T. ; Kidera, M. ; Miyazawa, Y. ; Hemmi, M. ; Chiba, T. ; Inabe, N. ; Kase, M. ; Kageyama, T. ; Kamigaito, O. ; Goto, A. ; Yano, Y. / Production of highly charged ions in the RIKEN 18 GHz ECR ion source using an electrode in two modes. In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 1999 ; Vol. 152, No. 2. pp. 386-396.
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AU - Biri, S.

AU - Nakagawa, T.

AU - Kidera, M.

AU - Miyazawa, Y.

AU - Hemmi, M.

AU - Chiba, T.

AU - Inabe, N.

AU - Kase, M.

AU - Kageyama, T.

AU - Kamigaito, O.

AU - Goto, A.

AU - Yano, Y.

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