Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51b1803h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM51B-1803
Physics
Plasma Physics
[2494] Ionosphere / Instruments And Techniques, [2794] Magnetospheric Physics / Instruments And Techniques, [6297] Planetary Sciences: Solar System Objects / Instruments And Techniques, [7894] Space Plasma Physics / Instruments And Techniques
Scientific paper
Accurately calibrating space plasma instruments is challenging and requires a precise, controllable source for the energy range and species of interest. For electrons, radioactive beta sources can be used, though their characteristics have inherent limitations for measuring the angular and energy response of particle counting instruments. We report the development of a compact, low resource, general purpose electron source. A collimated, monoenergetic beam of electrons, up to 20 mm in diameter, is produced with energies ranging from 0.03 to 30 keV. The electrons are generated by illuminating a plate of magnesium with an ultraviolet LED where they are accelerated away from the plate to a grounded grid. The negative voltage applied to the plate determines the energy of electrons with a fixed width. The illumination from the LED on the plate is chosen to be uniform, providing a relatively flat electron beam profile. With passive collimation the angular divergence of the beam is less than 3.8 degrees FWHM. Using an LED current driver with amplitude modulation capability, arbitrary electron beam intensities (1 - 10^6 Hz) are achieved with 200 us time resolution. This device is relatively simple to construct and inexpensive and can be implemented in many laboratories, particularly those involved with calibrating low energy plasma instruments or characterizing of low energy detectors.
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