First Experiments with MePS

Jungmann, Marco; Haeberle, J; Krause‐Rehberg, R.; Anwand, W.; Butterling, Maik; Wagner, A.; Johnson, J M; Cowan, T. E.

doi:10.1088/1742-6596/443/1/012088

Cited by 15 publications

(11 citation statements)

References 3 publications

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“…Other positron beams have been constructed using linacs, but so far none have been able to match the intensity of the LLNL beam (e.g. [348][349][350]). Accelerator-based beams of this type are generally large and expensive, and are not widely available.…”

Section: Optical Excitation Of Positronium Atomsmentioning

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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Section: Optical Excitation Of Positronium Atomsmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…Several facilities of this type are currently in operation around the world with electron energies from about 15 MeV to 1.3 GeV (Jungmann et al, 2013;Krause-Rehberg et al, 2008;O'Rourke et al, 2011;Wada et al, 2012;Wang et al, 2008). It is also possible to obtain useful positron output using more modest electron accelerators.…”

Section: Electron Acceleratorsmentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

234

222

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In recent years, there has been a wealth of new science involving low-energy antimatter (i.e., positrons and antiprotons) at energies ranging from 10 2 to less than 10 −3 eV. Much of this progress has been driven by the development of new plasma-based techniques to accumulate, manipulate and deliver antiparticles for specific applications. This article focuses on the advances made in this area using positrons. However many of the resulting techniques are relevant to antiprotons as well. An overview is presented of relevant theory of single-component plasmas in electromagnetic traps. Methods are described to produce intense sources of positrons and to efficiently slow the typically energetic particles thus produced. Techniques are described to trap positrons efficiently and to cool and compress the resulting positron gases and plasmas. Finally, the procedures developed to deliver tailored pulses and beams (e.g., in intense, short bursts, or as quasi-monoenergetic continuous beams) for specific applications are reviewed. The status of development in specific application areas is also reviewed. One example is the formation of antihydrogen atoms for fundamental physics [e.g., tests of invariance under charge conjugation, parity inversion and time reversal (the CPT theorem), and studies of the interaction of gravity with antimatter]. Other applications discussed include atomic and materials physics studies and study of the electron-positron many-body system, including both classical electron-positron plasmas and the complementary quantum system in the form of Bose-condensed gases of positronium atoms. Areas of future promise are also discussed. The review concludes with a brief summary and a list of outstanding challenges.

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“…MePS has also been employed successfully for porosity studies of ultra low-k dielectric thin films as promising materials for advanced inter-connects scheme of ultra-large scale integrated devices. The aim is the reduction of resistance-capacitance delay and cross-talk noise by the introduction of nanoscale voids inside the insulating SiO 2 [6,7]. In the future, MePS will be complemented by an ultra-high vacuum system for in-situ defect studies called Apparatus for In-Situ Defect Analysis (AIDA).…”

Section: The Mono-energetic Positron Source Mepsmentioning

confidence: 99%

Positron annihilation lifetime spectroscopy at a superconducting electron accelerator

Wagner

Anwand

Attallah

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. The Helmholtz-Zentrum Dresden-Rossendorf operates a superconducting linear accelerator for electrons with energies up to 35 MeV and average beam currents up to 1.6 mA. The electron beam is employed for production of several secondary beams including X-rays from bremsstrahlung production, neutrons, and positrons. The secondary positron beam after moderation feeds the Monoenergetic Positron Source (MePS) where positron annihilation lifetime (PALS) and positron annihilation Doppler-broadening experiments in materials science are performed in parallel. The adjustable repetition rate of the continuous-wave electron beams allows matching of the pulse separation to the positron lifetime in the sample under study. The energy of the positron beam can be set between 0.5 keV and 20 keV to perform depth resolved defect spectroscopy and porosity studies especially for thin films.

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First Experiments with MePS

Cited by 15 publications

References 3 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Plasma and trap-based techniques for science with positrons

Positron annihilation lifetime spectroscopy at a superconducting electron accelerator

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