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Title: Extraction of single-ion beams from helicon ion source in high plasma density operation mode: Experiment and simulation

Abstract

Tests of a high plasma density high-brightness helicon ion source for nuclear microscopy applications are underway. Experiments were performed with hydrogen, helium, and argon. Different extraction structures of the helicon rf ion source were investigated with an imposed external magnetic field. We present measurements of the extracted current as a function of the extraction voltage and rf power. The source has been diagnosed by a microwave interferometer. Plasma densities in the vicinity of the emission hole of up to 7.2x10{sup 12} cm{sup -3} (for argon), 1.6x10{sup 12} cm{sup -3} (for helium), and 6.0x10{sup 11} cm{sup -3} (for hydrogen) were obtained for working gas pressure of <5 mTorr and rf power <350 W (f{sub rf}=27.12 MHz). The ion current density was 80 mA/cm{sup 2} with high percentage of protons in the beam ({approx}80%). In the extraction structure, the cathode channel has a 3 mm length and a 0.6 mm diameter. The phase set degradation due to aberrations in the extraction structure of the helicon rf ion source was simulated for a fourth-order approximation in series expansion of the electrostatic potential and third-order approximation in series of the magnetic fields, by the matrizant method. The calculations were performed involving experimental data onmore » ion energy spread, average ion energy, and plasma density of the helicon rf ion source with permanent magnets.« less

Authors:
; ; ; ; ; ;  [1]
  1. Institute of Applied Physics, National Academy of Sciences of the Ukraine, Sumy (Ukraine)
Publication Date:
OSTI Identifier:
20779083
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: 10.1063/1.2147739; (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; ARGON; BEAM EXTRACTION; BEAM-PLASMA SYSTEMS; BRIGHTNESS; CATHODES; HELIUM; HYDROGEN; INTERFEROMETERS; ION BEAMS; ION SOURCES; IONS; MAGNETIC FIELDS; PERMANENT MAGNETS; PLASMA; PLASMA DENSITY

Citation Formats

Mordyk, S., Miroshnichenko, V., Nahornyy, A., Nahornyy, D., Shulha, D., Storizhko, V., and Voznyy, V. Extraction of single-ion beams from helicon ion source in high plasma density operation mode: Experiment and simulation. United States: N. p., 2006. Web. doi:10.1063/1.2147739.
Mordyk, S., Miroshnichenko, V., Nahornyy, A., Nahornyy, D., Shulha, D., Storizhko, V., & Voznyy, V. Extraction of single-ion beams from helicon ion source in high plasma density operation mode: Experiment and simulation. United States. doi:10.1063/1.2147739.
Mordyk, S., Miroshnichenko, V., Nahornyy, A., Nahornyy, D., Shulha, D., Storizhko, V., and Voznyy, V. Wed . "Extraction of single-ion beams from helicon ion source in high plasma density operation mode: Experiment and simulation". United States. doi:10.1063/1.2147739.
@article{osti_20779083,
title = {Extraction of single-ion beams from helicon ion source in high plasma density operation mode: Experiment and simulation},
author = {Mordyk, S. and Miroshnichenko, V. and Nahornyy, A. and Nahornyy, D. and Shulha, D. and Storizhko, V. and Voznyy, V.},
abstractNote = {Tests of a high plasma density high-brightness helicon ion source for nuclear microscopy applications are underway. Experiments were performed with hydrogen, helium, and argon. Different extraction structures of the helicon rf ion source were investigated with an imposed external magnetic field. We present measurements of the extracted current as a function of the extraction voltage and rf power. The source has been diagnosed by a microwave interferometer. Plasma densities in the vicinity of the emission hole of up to 7.2x10{sup 12} cm{sup -3} (for argon), 1.6x10{sup 12} cm{sup -3} (for helium), and 6.0x10{sup 11} cm{sup -3} (for hydrogen) were obtained for working gas pressure of <5 mTorr and rf power <350 W (f{sub rf}=27.12 MHz). The ion current density was 80 mA/cm{sup 2} with high percentage of protons in the beam ({approx}80%). In the extraction structure, the cathode channel has a 3 mm length and a 0.6 mm diameter. The phase set degradation due to aberrations in the extraction structure of the helicon rf ion source was simulated for a fourth-order approximation in series expansion of the electrostatic potential and third-order approximation in series of the magnetic fields, by the matrizant method. The calculations were performed involving experimental data on ion energy spread, average ion energy, and plasma density of the helicon rf ion source with permanent magnets.},
doi = {10.1063/1.2147739},
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}
}