Proceedings

EPJ D Colloquium - Experimental progress in positronium laser physics

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 ≥106) 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 107 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.

In this substantial Colloquium paper, David Cassidy (University College London) has prepared a comprehensive summary of recent progress in this area, providing a detailed overview of the field as it stands, and a brief discussion of some future research directions.

We found this possibility of publication very well suited to our needs, the editors were always available with a very efficient follow-up of our demands. All the documents guaranteeing the peer reviewing and the authorizations of publication are clear. The only drawback is the visible contradiction between the author instructions for the word versions and the website for testing the PDF version, but even there the editors help us very quickly and efficiently.

Jean-Marc Bordy, CEA Saclay, France
Co-Editor EPJ Web of Conferences vol. 124, 2016

ISSN: 2100-014X (Electronic Edition)

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