A 100 keV operation of a large vacuum‐immersed H− ion source

Y. Oka; O. Kaneko; Y. Takeiri; K. Tsumori; A. Ando; E. Asano; R. Akiyama; T. Kawamoto; T. Kuroda

doi:10.1063/1.1146747

A 100 keV operation of a large vacuum‐immersed H⁻ ion source

Y. Oka, O. Kaneko, Y. Takeiri, K. Tsumori, A. Ando, E. Asano, R. Akiyama, T. Kawamoto, T. Kuroda

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

A large vacuum‐immersed H⁻ ion source has been operated on the negative‐ion‐based neutral beam teststand. The achieved level of the beam and the pulse duration in beam conditioning were limited by a high‐voltage breakdown in the vacuum vessel. A baffle plate at grounded potential for shielding completely from the charged particles was successful. A beam with an energy of up to 102 keV and the H⁻ ion current of 0.55 A were achieved for 0.29 s without the breakdown. The ion current of ∼1.5 A was accelerated in cesium‐seeded operation. The corresponding ion current density was ∼7 mA/cm². A magnetic filter (as Type I LV magnetic filter) on the plasma electrode was applied. The electron beam component which was extracted from the plasma source together with H⁻ ions was found to be very reduced.

Original language	English
Pages (from-to)	1029-1031
Number of pages	3
Journal	Review of Scientific Instruments
Volume	67
Issue number	3
DOIs	https://doi.org/10.1063/1.1146747
Publication status	Published - 1996 Mar
Externally published	Yes

Keywords

AMP BEAM CURRENTS
ELECTROSTATIC ACCELERATORS
HYDROGEN IONS 1 MINUS
ION SOURCES
KEV RANGE 100−1000
NEUTRAL ATOM BEAM INJECTION
PLASMA
VACUUM SYSTEMS

ASJC Scopus subject areas

Instrumentation

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title = "A 100 keV operation of a large vacuum‐immersed H− ion source",

abstract = "A large vacuum‐immersed H− ion source has been operated on the negative‐ion‐based neutral beam teststand. The achieved level of the beam and the pulse duration in beam conditioning were limited by a high‐voltage breakdown in the vacuum vessel. A baffle plate at grounded potential for shielding completely from the charged particles was successful. A beam with an energy of up to 102 keV and the H− ion current of 0.55 A were achieved for 0.29 s without the breakdown. The ion current of ∼1.5 A was accelerated in cesium‐seeded operation. The corresponding ion current density was ∼7 mA/cm2. A magnetic filter (as Type I LV magnetic filter) on the plasma electrode was applied. The electron beam component which was extracted from the plasma source together with H− ions was found to be very reduced.",

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author = "Y. Oka and O. Kaneko and Y. Takeiri and K. Tsumori and A. Ando and E. Asano and R. Akiyama and T. Kawamoto and T. Kuroda",

year = "1996",

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AU - Oka, Y.

AU - Kaneko, O.

AU - Takeiri, Y.

AU - Tsumori, K.

AU - Ando, A.

AU - Asano, E.

AU - Akiyama, R.

AU - Kawamoto, T.

AU - Kuroda, T.

PY - 1996/3

Y1 - 1996/3

N2 - A large vacuum‐immersed H− ion source has been operated on the negative‐ion‐based neutral beam teststand. The achieved level of the beam and the pulse duration in beam conditioning were limited by a high‐voltage breakdown in the vacuum vessel. A baffle plate at grounded potential for shielding completely from the charged particles was successful. A beam with an energy of up to 102 keV and the H− ion current of 0.55 A were achieved for 0.29 s without the breakdown. The ion current of ∼1.5 A was accelerated in cesium‐seeded operation. The corresponding ion current density was ∼7 mA/cm2. A magnetic filter (as Type I LV magnetic filter) on the plasma electrode was applied. The electron beam component which was extracted from the plasma source together with H− ions was found to be very reduced.

AB - A large vacuum‐immersed H− ion source has been operated on the negative‐ion‐based neutral beam teststand. The achieved level of the beam and the pulse duration in beam conditioning were limited by a high‐voltage breakdown in the vacuum vessel. A baffle plate at grounded potential for shielding completely from the charged particles was successful. A beam with an energy of up to 102 keV and the H− ion current of 0.55 A were achieved for 0.29 s without the breakdown. The ion current of ∼1.5 A was accelerated in cesium‐seeded operation. The corresponding ion current density was ∼7 mA/cm2. A magnetic filter (as Type I LV magnetic filter) on the plasma electrode was applied. The electron beam component which was extracted from the plasma source together with H− ions was found to be very reduced.

KW - AMP BEAM CURRENTS

KW - ELECTROSTATIC ACCELERATORS

KW - HYDROGEN IONS 1 MINUS

KW - ION SOURCES

KW - KEV RANGE 100−1000

KW - NEUTRAL ATOM BEAM INJECTION

KW - PLASMA

KW - VACUUM SYSTEMS

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