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Development of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum

Abstract : We have developed a high-efficiency pulsed slow positron beam for experiments with orthopositronium in vacuum. The new pulsing scheme is based on a double-gap coaxial buncher powered by an RF pulse of appropriate shape. The modulation of the positron velocity in the two gaps is used to adjust their time-of-flight to a target. This pulsing scheme allows to minimize non-linear aberrations in the bunching process and to efficiently compress positron pulses with an initial pulse duration ranging from ∼ 300 to 50 ns into bunches of 2.3 to 0.4 ns width, respectively, with a repetition period of 1 mu s. The compression ratio achieved is ≃ 100, which is a factor 5 better than has been previously obtained with slow positron beams based on a single buncher. Requirements on the degree, to which the moderated positrons should be mono-energetic and on the precision of the waveform generation are presented. Possible applications of the new pulsed positron beam for measurements of thin films are discussed.
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http://hal.in2p3.fr/in2p3-00025543
Contributor : Claudine Bombar <>
Submitted on : Tuesday, January 31, 2006 - 5:56:34 PM
Last modification on : Wednesday, July 22, 2020 - 9:54:17 AM

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N. Alberola, T. Anthonioz, A. Badertscher, C. Bas, A.S. Belov, et al.. Development of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2006, 560, pp.224-232. ⟨10.1016/j.nima.2006.01.025⟩. ⟨in2p3-00025543⟩

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