A magnetic transport line, a magnetic field terminator and a positron buncher were designed and built to focus low-energy positron pulses from a Surko-type accumulator on a porous target. The 25 electrodes buncher, which produces a parabolic potential, was designed to implant 5 ns positron bunches with a spot of 3 mm into a target held at cryogenic temperature. These pulses will be used to obtain cooled Ps clouds into vacuum for laser excitation in spectroscopy experiments. By using high-voltage fast switches and a proper mu-metal shield the requirement to form Ps in a free (magnetic and electric) field region was satisfied compatibly with the request of injecting positrons at energies of 5-9 keV. The optical design, the electrical circuitry of the buncher and the construction solutions of the whole apparatus will be presented and explained.

Positron bunching system for producing positronium clouds into vacuum / Penasa, Luca; Di Noto, Lea; Bettonte, Marco; Mariazzi, S.; Nebbia, G.; Brusa, Roberto Sennen. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 505:1(2014), p. 012031. ((Intervento presentato al convegno 13th International Workshop on Slow Positron Beam Techniques and Applications, SLOPOS 2013 tenutosi a Munich, deu nel 2013 [10.1088/1742-6596/505/1/012031].

Positron bunching system for producing positronium clouds into vacuum

Penasa, Luca;Di Noto, Lea;Bettonte, Marco;Mariazzi, S.;Brusa, Roberto Sennen
2014

Abstract

A magnetic transport line, a magnetic field terminator and a positron buncher were designed and built to focus low-energy positron pulses from a Surko-type accumulator on a porous target. The 25 electrodes buncher, which produces a parabolic potential, was designed to implant 5 ns positron bunches with a spot of 3 mm into a target held at cryogenic temperature. These pulses will be used to obtain cooled Ps clouds into vacuum for laser excitation in spectroscopy experiments. By using high-voltage fast switches and a proper mu-metal shield the requirement to form Ps in a free (magnetic and electric) field region was satisfied compatibly with the request of injecting positrons at energies of 5-9 keV. The optical design, the electrical circuitry of the buncher and the construction solutions of the whole apparatus will be presented and explained.
journal of Physics Conference Series Volume: 505 Article Number: 012031
IOP PUBLISHING LTD, DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Institute of Physics Publishing
Penasa, Luca; Di Noto, Lea; Bettonte, Marco; Mariazzi, S.; Nebbia, G.; Brusa, Roberto Sennen
Positron bunching system for producing positronium clouds into vacuum / Penasa, Luca; Di Noto, Lea; Bettonte, Marco; Mariazzi, S.; Nebbia, G.; Brusa, Roberto Sennen. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 505:1(2014), p. 012031. ((Intervento presentato al convegno 13th International Workshop on Slow Positron Beam Techniques and Applications, SLOPOS 2013 tenutosi a Munich, deu nel 2013 [10.1088/1742-6596/505/1/012031].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/116998
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