Gamma-induced Positron Spectroscopy (GiPS) at a superconducting electron linear accelerator

Butterling, Maik; Anwand, W.; Cowan, T. E.; Hartmann, Andreas; Jungmann, Marco; Krause‐Rehberg, R.; Krille, Arnold; Wagner, A.

doi:10.1016/j.nimb.2011.06.023

Cited by 35 publications

(20 citation statements)

References 14 publications

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“…A second accelerator-driven positron source is realized in the so-called Gamma-induced Positron Source (GiPS) [8]. A pioneering technology called "accelerator-based γ-ray-induced PAS" or AGAPS at a normal conducting electron LINAC had been developed at Idaho State University and it was used for Doppler-broadening spectroscopy experiments [9].…”

Section: The Gamma-induced Positron Source Gipsmentioning

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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Section: The Gamma-induced Positron Source Gipsmentioning

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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“…The general description and advantages of GiPS--AMOC technique and its comparison with conventional technique were discussed previously [2]. We consider it mainly because of a perfect signal-to-background ratio and the absence of dissolved or sandwiched positron source.…”

Section: Methodsmentioning

confidence: 99%

The Evidence of Quasi-Free Positronium State in GiPS-AMOC Spectra of Glycerol

et al. 2014

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We present the results of processing of age-momentum correlation spectra that were measured for glycerol by the gamma-induced positron spectroscopy facility. Our research has shown that the shape of experimental s(t) curve cannot be explained without introduction of the intermediate state of positronium (Ps), called quasi-free Ps. This state yields the wide Doppler line near zero lifetimes. We discuss the possible properties of this intermediate Ps state from the viewpoint of developed model. The amount of annihilation events produced by quasi-free Ps is estimated to be less than 5% of total annihilations. In the proposed model, quasi-free Ps serves as a precursor for trapped Ps of para -and ortho -states.

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“…This has been achieved by developing the unique facility "Gamma Induced Positron Spectroscopy (GIPS)" at HelmholtzZentrum Dresden-Rossendorf (HZDR) in Dresden, Germany [9,17]. The HZDR superconducting accelerator runs at 26 MHz providing a great platform to perform positron lifetime measurements.…”

Section: γ-Induced Pas Using Pulsed Superconducting Electron Acceleramentioning

confidence: 99%

“…DBPAS and ACAR measurements can be performed using any high intense γ-rays while PALS require short pulsed accelerators or coincident γ-rays commonly originated in nuclear reactions. Number of works [5,6,9] have confirmed the feasibility of DBPAS and PALS using γ-ray, however γ-induced ACAR measurements have yet to be performed.…”

Section: Introductionmentioning

confidence: 99%

Gamma Induced Positron Annihilation: History, Current, and Future Developments

Selim

2017

Acta Phys. Pol. A

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Positron annihilation spectroscopy is often performed using radioactive sources for bulk measurements or positron beams for depth resolved measurements. Both have many advantages and great capabilities for a variety of applications. In the recent history, we have shown that positron annihilation spectroscopy can be carried out directly using high energy photons without the need for positron source or positron beam. This approach brings unique capabilities for some specific applications and promotes the use of positron annihilation spectroscopy in new areas of materials science and probably in industrial applications. Some of the important applications include developing new nondestructive highly penetrating sensitive probe for structural and engineering materials. It can also greatly advance positron applications in bulk semiconductors, electronic and photonic materials as well as in polymers, ceramics, and liquids. The recently developed γ-induced positron spectroscopy in HZDR in Dresden provides an example of an excellent facility for many of these applications. When incorporated with pulsed accelerators, γ-induced positron annihilation spectroscopy may trigger novel studies of transient states in matter and explore several solid-state processes that take place on short time scale. In this article I will review the history and development of the technique and its incorporation in a wide range of accelerators including table top electron accelerators, pulsed electron accelerators, and Van de Graaff accelerators. Then I will introduce a design for a new γ-induced positron annihilation spectroscopy facility based on using small nuclear research reactors or neutron generators. The paper presents all the possible approaches for γ-induced positron annihilation spectroscopy and discusses its potential and limitations to guide the efforts in further development of the technique and illustrate the unique aspects that the technique can bring to positron science and applications.

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Gamma-induced Positron Spectroscopy (GiPS) at a superconducting electron linear accelerator

Cited by 35 publications

References 14 publications

Positron annihilation lifetime spectroscopy at a superconducting electron accelerator

Positron annihilation lifetime spectroscopy at a superconducting electron accelerator

The Evidence of Quasi-Free Positronium State in GiPS-AMOC Spectra of Glycerol

Gamma Induced Positron Annihilation: History, Current, and Future Developments

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