Measurements with the new prebuncher for the existing pulsed positron beam (presented at ICPA‐9) show the possibility of bunching a dc‐beam with a time structure of 2.1ns (FWHM). The pulse width is very sensitive to the longitudinal energy distribution of the moderated positrons. A pulse width of 2.1ns corresponds to a longitudinal energy distribution of 0.35(5) eV. With a retarding grid configuration we measured the positron yield. Measurements with inhomogenic magnetic guiding fields clearly show the influence of elastically scattered events. Their fraction is very sensitive to the surface condition of the moderator. The nonscattered positrons are very well represented by a Gaussian distribution function. Its FWHM is in good overall agreement with the timing measurements.
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15 June 1994
The fifth international workshop on slow positron beam techniques for solids and surfaces
5−10 Aug 1992
Jackson Hole, Wyoming (USA)
Research Article|
June 15 1994
Retarding field and timing measurements of positrons from a W[100] foil
P. Willutzki;
P. Willutzki
Institut für Nukleare Festköperphysik, Universität der Bundswehr München, D‐8014 Neubiberg, Werner‐Heisenberg‐Weg 39, Germany
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J. Störmer;
J. Störmer
Institut für Nukleare Festköperphysik, Universität der Bundswehr München, D‐8014 Neubiberg, Werner‐Heisenberg‐Weg 39, Germany
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D. T. Britton;
D. T. Britton
Institut für Nukleare Festköperphysik, Universität der Bundswehr München, D‐8014 Neubiberg, Werner‐Heisenberg‐Weg 39, Germany
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G. Kögel;
G. Kögel
Institut für Nukleare Festköperphysik, Universität der Bundswehr München, D‐8014 Neubiberg, Werner‐Heisenberg‐Weg 39, Germany
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P. Sperr;
P. Sperr
Institut für Nukleare Festköperphysik, Universität der Bundswehr München, D‐8014 Neubiberg, Werner‐Heisenberg‐Weg 39, Germany
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R. Steindl;
R. Steindl
Institut für Nukleare Festköperphysik, Universität der Bundswehr München, D‐8014 Neubiberg, Werner‐Heisenberg‐Weg 39, Germany
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W. Triftshäuser
W. Triftshäuser
Institut für Nukleare Festköperphysik, Universität der Bundswehr München, D‐8014 Neubiberg, Werner‐Heisenberg‐Weg 39, Germany
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AIP Conf. Proc. 303, 542–549 (1994)
Citation
P. Willutzki, J. Störmer, D. T. Britton, G. Kögel, P. Sperr, R. Steindl, W. Triftshäuser; Retarding field and timing measurements of positrons from a W[100] foil. AIP Conf. Proc. 15 June 1994; 303 (1): 542–549. https://doi.org/10.1063/1.45536
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