Abstract
The Wien filter is an E×B deflecting analyzer with the electrostatic field perpendicular to the magnetostatic field. The twofold functions of the Wien filter are as an energy analyzer as well as a mass analyzer. It has very high resolution for paraxial charged particle beams with V=E/B, the Wien velocity. Two Wien filters were built and tested for electrons up to 3.5 keV and protons beams of 200 eV. The performance of the two is compared and appears to have features useful for high-temperature plasma diagnostics including simultaneous measurement of energy and mass spectra and high resolution.
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