Positronium formation from porous silica in backscattering and transmission geometries

Andersen, Stine Linding; Johansen, Rasmus R.; Overgaard, Jakob B.; Mortensen, Johan K.; Andersen, Kell K.; Thomsen, Heine; Lund, Mads M.; Chevallier, J.; Knudsen, H.; Uggerhøj, U. I.

doi:10.1140/epjd/e2014-40762-x

Cited by 10 publications

(16 citation statements)

References 24 publications

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“…The system is described in detail elsewhere [31,32]. Briefly, positrons emitted by a 50 mCi 22 Na source were moderated by a solid Ne film [33] and prepared by a Surko-style trap [34] and accumu-lator. After rotating-wall compression [35], positrons were bunched and magnetically transported towards a trap system of 24 electrodes, where they were recompressed into a pulse of less than 10 ns length and accelerated onto the e þ /Ps converter.…”

Section: Methodsmentioning

confidence: 99%

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Characterization of a transmission positron/positronium converter for antihydrogen production

Aghion

Amsler

Ariga

et al. 2017

Nuclear Instruments and Methods in Physics Research Section B:

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and 10 ns temporal width. The forward emission of implanted positrons and secondary electrons was investigated with a micro-channel plate -phosphor screen assembly, connected either to a CCD camera for imaging of the impinging particles, or to a fast photomultiplier tube to extract information about their time of flight. The maximum Ps formation fraction was estimated to be $10%. At least 10% of the positrons implanted with an energy of 3.3 keV are forward-emitted with a scattering angle smaller than 50°and maximum kinetic energy of 1.2 keV. At least 0.1-0.2 secondary electrons per implanted positron were also found to be forward-emitted with a kinetic energy of a few eV. The possible application of this kind of positron/positronium converter for antihydrogen production is discussed.

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Section: Methodsmentioning

confidence: 99%

“…Recently, thin mesostructured silica film targets have been developed in order to obtain Ps in transmission geometry, i.e. o-Ps emitted from the opposite side of the target with respect to the positron implantation [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Characterization of a transmission positron/positronium converter for antihydrogen production

Aghion

Amsler

Ariga

et al. 2017

Nuclear Instruments and Methods in Physics Research Section B:

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“…Thin (100 nm) Ag foils heated to 1000 K work at about 10% efficiency [243]. It is also possible to produce Ps in transmission from mesoporous structures applied to very thin (20 nm) substrates, also with approximately 10% efficiency [128,308]. Fast (10-500 eV) Ps can be produced by passing an energetic positron beam through a thin foil of carbon [242], with a few % efficiency.…”

Section: Ps Productionmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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“…Experimental studies on electron driven processes in a chlorodifluoroacetic acid methyl ester were presented by Kopyra [22], while dissociative electron attachment to titatinum tetrachloride and titanium tetraisopropoxide were presented by Bjarnason et al [23]. As far as positronium and positrons are concerned, we note the contributions from Andersen et al [24], Banković et al [25], Murtagh [26] and Guessoum [27], on "Positronium formation from porous silica in backscattering and transmission geometries", "Positron transport in CF 4 and N 2 /CF 4 mixtures", "A positron buncher-cooler and Positron astrophysics and areas of relation to low-energy positron physics", respectively. White et al [28] have reported on transport coefficients of electrons in mixtures of gaseous water and tetrahydrofuran (THF) as calculated using a multi-term solution of the Boltzmann equation.…”

Section: New Scientific Insightsmentioning

confidence: 86%

Electron and positron induced processes. POSMOL 2013

et al. 2014

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Abstract. POSMOL 2013, the international meeting on electron and positron induced processes comprising the XVII International Workshop on Low-Energy Positron and Positronium Physics and the XVIII International Symposium on Electron-Molecule Collisions and Swarms, was held at Kanazawa Bunka Hall, Kanazawa, Ishikawa, Japan, from 19-21 July 2013. The XVII Workshop encompassed all aspects of positron, positronium and antiproton interactions with electrons, atoms, molecules and solid surfaces, and topics related to these, whereas the XVIII Symposium encompassed all aspects of electron interactions with molecules in both gaseous and condensed phases. Particular topics include studies of electron interactions with biomolecules, electron induced surface chemistry and the study of plasma processes. Recent research on the study of electron swarms was also highlighted.

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Positronium formation from porous silica in backscattering and transmission geometries

Cited by 10 publications

References 24 publications

Characterization of a transmission positron/positronium converter for antihydrogen production

Characterization of a transmission positron/positronium converter for antihydrogen production

Experimental progress in positronium laser physics

Electron and positron induced processes. POSMOL 2013

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