dorsal/arxiv
View SchemaDevelopment of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum
| Authors | N. Alberola, T. Anthonioz, A. Badertscher, C. Bas, A. S. Belov, P. Crivelli, S. N. Gninenko, N. A. Golubev, M. M. Kirsanov, A. Rubbia, D. Sillou |
|---|---|
| Categories | |
| ArXiv ID | physics/0511048 |
| URL | https://arxiv.org/abs/physics/0511048 |
| DOI | 10.1016/j.nima.2006.01.025 |
| Journal | Nucl.Instrum.Meth.A560:224-232,2006 |
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 mks. 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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"abstract": "We have developed a high-efficiency pulsed slow positron beam for experiments\nwith orthopositronium in vacuum. The new pulsing scheme is based on a\ndouble-gap coaxial buncher powered by an RF pulse of appropriate shape. The\nmodulation of the positron velocity in the two gaps is used to adjust their\ntime-of-flight to a target. This pulsing scheme allows to minimize non-linear\naberrations in the bunching process and to efficiently compress positron pulses\nwith an initial pulse duration ranging from 300 to 50 ns into bunches of 2.3 to\n0.4 ns width, respectively, with a repetition period of 1 mks. The compression\nratio achieved is ~100, which is a factor 5 better than has been previously\nobtained with slow positron beams based on a single buncher. Requirements on\nthe degree, to which the moderated positrons should be mono-energetic and on\nthe precision of the waveform generation are presented. Possible applications\nof the new pulsed positron beam for measurements of thin films are discussed.",
"arxiv_id": "physics/0511048",
"authors": [
"N. Alberola",
"T. Anthonioz",
"A. Badertscher",
"C. Bas",
"A. S. Belov",
"P. Crivelli",
"S. N. Gninenko",
"N. A. Golubev",
"M. M. Kirsanov",
"A. Rubbia",
"D. Sillou"
],
"categories": [
"physics.acc-ph"
],
"doi": "10.1016/j.nima.2006.01.025",
"journal_ref": "Nucl.Instrum.Meth.A560:224-232,2006",
"title": "Development of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum",
"url": "https://arxiv.org/abs/physics/0511048"
},
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