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Review of Scientific Instruments / Volume 74 / Issue 7 / ARTICLES / PARTICLE SOURCES, OPTICS and ACCELERATION; PARTICLE DETECTORS

Rev. Sci. Instrum. 74, 3312 (2003); http://dx.doi.org/10.1063/1.1584086 (5 pages)

Vacuum bench for the characterization of thermoionization ion sources

C. Guillermier1, C. P. Lechene1, J. Hill2, and F. Hillion3

1National Resource for Imaging Mass Spectrometry, Harvard Medical School and Brigham and Women’s Hospital, Cambridge, Massachusetts 02139
2J. A. Hill Instrument Services, Arlington, Massachusetts 02474
3CAMECA, 103 Blvd Saint-Denis, 92400 Courbevoie, France

(Received 14 February 2003; accepted 17 April 2003)

We have designed a vacuum bench to study the parameters of thermoionization sources with the ultimate goal of obtaining high spatial resolution for biomedical applications of secondary ion mass spectrometry. In the bench, the source ionizer can be directly heated with an electron gun positioned perpendicular to the axis of the ion beam and focused with an optical system including slit lenses and a magnetic sector. The source cross over diameter is measured by forming the image of the source using an Einzel lens at a 1×magnification. The ion beam current is measured in a Faraday cup placed after a movable diaphragm. The temperature of the diverse elements of the ionizer assembly is measured through a mirror with a micropyrometer. Using the vacuum bench with a cesium carbonate source, we measured a 35 μm minimum cross over size, and we calculated a 400 A/cm2/srmaximum brightness. We obtained an intense cesium ion beam when heating the ionizer with the electron gun. The vacuum bench will be used to compare the effect of the heating mode of the ionizer (i.e., indirect by filament electron emission or direct by electron beam) on the brightness of the cesium source, and to develop a thermoionization iodine negative ion source. © 2003 American Institute of Physics.

© 2003 American Institute of Physics

ERRATUM

  1. Erratum: "Vacuum bench for the characterization of thermoionization ion sources" [Rev. Sci. Instrum. 74, 3312 (2003)]
    C. Guillermier et al.
    Rev. Sci. Instrum. 75, 2487 (2004)RSINAK000075000007002487000001

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KEYWORDS and PACS

Keywords

caesium compounds, brightness, ionisation, secondary ion mass spectra, biomedical measurement, biological techniques, ion sources, thermionic ion emission

PACS

  • 87.64.-t

    Spectroscopic and microscopic techniques in biophysics and medical physics

  • 82.80.Ms

    Mass spectrometry (including SIMS, multiphoton ionization and resonance ionization mass spectrometry, MALDI)

  • 29.25.Ni

    Ion sources: positive and negative

  • 07.77.Ka

    Charged-particle beam sources and detectors

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1584086

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. Pelletier, C. Pomot, and J. Cocagne, J. Appl. Phys. 50, 4517 (1979)JAPIAU000050000007004517000001.


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