What is it about?
This is a lens used to form a microbeam at a particle accelerator such as a van de Graaff accelerator. The microbeam can be used to make a scanning microscope. An example is the PIXE techniques on polished metallurgical samples, in which the proton beam excites X rays from grains and impurities in the specimen.
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Why is it important?
The achromatic functioning of the lens enabled a constant focus in spite of unavoidable energy fluctuations of the accelerator. It adopted the achromatic principle used in electron microscopy for use with positive ions for the first time.
Perspectives
Kudos hires its data, and claims not to be able to fix errors. The proper citation to the paper is F. W. Martin and R. Goloskie, Applied Physics Letters 40, 191 (1982).
Dr Fred W. Martin
Nanobeam Corporation
Read the Original
This page is a summary of: An achromatic quadrupole lens doublet for positive ions, Applied Physics Letters, January 1982, American Institute of Physics,
DOI: 10.1063/1.93004.
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