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Title: H{sup -} ion beam extraction from a transformer coupled plasma source with triode extraction system

Abstract

A continuous-mode H{sup -} ion source has been developed in SNU by using rf transformer coupled plasma source for long lifetime. Recently, its plasma confinement has been improved by modifying the main cusp magnet system that covers rf antenna and plasma electrode regions. The extraction system has also been upgraded to triode extraction system, where permanent magnets in dipole configuration are embedded in extraction electrode to provide additional magnetic field for filtering out fast electrons. Electrode shape, extraction hole size, and gap distance are optimized for high beam currents with low emittance by using PBGUNS code. With new configuration, H{sup -} beam currents of up to 1.67 mA with 1.7 kW, 13.56 MHz rf power are extracted in a continuous mode. Low e/H{sup -} ratios down to 8 are achieved by increasing total filtering field strength up to 190 G.

Authors:
; ; ; ;  [1]
  1. Department of Nuclear Engineering, Seoul National University, Seoul 151-742 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20779021
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 77; Journal Issue: 3; Conference: 11. international conference on ion sources, Caen (France), 12-16 Sep 2005; Other Information: DOI: 10.1063/1.2172341; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ANTENNAS; BEAM CURRENTS; BEAM EXTRACTION; ELECTRODES; EXTRACTION; HYDROGEN IONS 1 MINUS; ION BEAMS; ION SOURCES; PERMANENT MAGNETS; PLASMA; PLASMA CONFINEMENT; TRANSFORMERS

Citation Formats

Jeong, H.S., Kim, Y.J., Hong, I.S., Park, D.H., and Hwang, Y.S. H{sup -} ion beam extraction from a transformer coupled plasma source with triode extraction system. United States: N. p., 2006. Web. doi:10.1063/1.2172341.
Jeong, H.S., Kim, Y.J., Hong, I.S., Park, D.H., & Hwang, Y.S. H{sup -} ion beam extraction from a transformer coupled plasma source with triode extraction system. United States. doi:10.1063/1.2172341.
Jeong, H.S., Kim, Y.J., Hong, I.S., Park, D.H., and Hwang, Y.S. Wed . "H{sup -} ion beam extraction from a transformer coupled plasma source with triode extraction system". United States. doi:10.1063/1.2172341.
@article{osti_20779021,
title = {H{sup -} ion beam extraction from a transformer coupled plasma source with triode extraction system},
author = {Jeong, H.S. and Kim, Y.J. and Hong, I.S. and Park, D.H. and Hwang, Y.S.},
abstractNote = {A continuous-mode H{sup -} ion source has been developed in SNU by using rf transformer coupled plasma source for long lifetime. Recently, its plasma confinement has been improved by modifying the main cusp magnet system that covers rf antenna and plasma electrode regions. The extraction system has also been upgraded to triode extraction system, where permanent magnets in dipole configuration are embedded in extraction electrode to provide additional magnetic field for filtering out fast electrons. Electrode shape, extraction hole size, and gap distance are optimized for high beam currents with low emittance by using PBGUNS code. With new configuration, H{sup -} beam currents of up to 1.67 mA with 1.7 kW, 13.56 MHz rf power are extracted in a continuous mode. Low e/H{sup -} ratios down to 8 are achieved by increasing total filtering field strength up to 190 G.},
doi = {10.1063/1.2172341},
journal = {Review of Scientific Instruments},
number = 3,
volume = 77,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}