C. Kurz et al., NEW SOURCE OF ULTRA-COLD POSITRON AND ELECTRON-BEAMS, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 143(1-2), 1998, pp. 188-194
We have developed a new and versatile source of cold (Delta E approxim
ate to 0.018 eV), low-energy (E approximate to 0-9 eV), magnetized pos
itrons and electrons. Particles are extracted from thermalized, room-t
emperature, single species plasmas confined in a Penning trap. Typical
ly, the trap contains From 10(7) to 10(9) particles, which can be rele
ased either in the form of a quasi steady-stale beam or as a pulsed be
am. Of the order of 100 pulses of 10(5) positrons, each 10 mu s in dur
ation, have been achieved. Size, duration and Frequency of pulses with
in a pulse train are easily variable over a wide range. Cold quasi ste
ady-slate electron beams with a diameter of approximate to 3 mm have a
lso been achieved. Limited only by the total charge contained in the t
rap, electron currents of 0.1 mu A for several milliseconds have been
generated routinely. This source represents a combination of attractiv
e features not previously available using any single technique. (C) 19
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