Study of Neutron Induced Defects in Ceramics using the GiPS Facility

Beck, S. May-Tal; Butterling, Maik; Anwand, W.; Beck, A. W.; Wagner, A.; Bräuer, G.; Ocherashvili, A.; Israelashvili, I.; Hen, O.

doi:10.1088/1742-6596/443/1/012076

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…The HZDR superconducting accelerator runs at 26 MHz providing a great platform to perform positron lifetime measurements. Since its development, GIPS has been used to carry out positron measurements in a wide range of systems [18,19] bringing new capabilities such as performing positron measurements in solutions, chemicals, and radioactive samples and enhancing defect analysis in semiconductors and oxides by eliminating source contribution and background from lifetime spectra [19].…”

Section: γ-Induced Pas Using Pulsed Superconducting Electron Acceleramentioning

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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Section: γ-Induced Pas Using Pulsed Superconducting Electron Acceleramentioning

confidence: 99%

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

Selim

2017

Acta Phys. Pol. A

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“…The following additional equipment is available for users: Mittendorff et al, 2015and Ozerov et al, 2014and Dienst et al, 2013and Kehr et al, 2011and Beck et al, 2013 3 High-Field High-Repetition-Rate THz Facility TELBE…”

Section: Felbe Specificationsmentioning

confidence: 99%

“…With variable positron kinetic energies samples can be investigated from the surface to a depth of about 2 μm. pELBE SPECIFICATIONS Energy 0.5 -20 keV Repetition rate 1.625, 6.5, 13 MHz Intensity 5・10 5 / s EXEMPLARY EXPERIMENTS  Pore size distributions in micro-porous gas-separation membranes  Porous structure of ultralow-k dielectrics for semiconductor applications  Structural and thermal vacancies in metal alloys  Defect-induced ferromagnetism in diluted magnetic oxides (Jungmann et al, 2013and Elsayed, Krause-Rehberg, Anwand, Butterling, Korff, 2011and Liedke et al, 2015and Beck et al, 2013  Photon scattering and photodissociation experiments  Gamma-induced positron spectroscopy (GiPS) using positron annihilation lifetime studies (PALS)  Tests of photon detectors at high energies (Massarczyk et al, 2014 andMakinaga et al, 2014).…”

Section: Mono-energetic Positron Source Pelbementioning

confidence: 99%

ELBE Center for High-Power Radiation Sources

Michel

2016

JLSRF

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Abstract:In the ELBE Center for High-Power Radiation Sources, the superconducting linear electron accelerator ELBE, serving two free electron lasers, sources for intense coherent THz radiation, mono-energetic positrons, electrons, γ-rays, a neutron time-of-flight system as well as two synchronized ultra-short pulsed Petawatt laser systems are collocated. The characteristics of these beams make the ELBE center a unique research instrument for a variety of external users in fields ranging from material science over nuclear physics to cancer research, as well as scientists of the Helmholtz-Zentrum Dresden-Rossendorf (HZDR).

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Modeling and X-ray Analysis of Defect Nanoclusters Formation in B4C under Ion Irradiation

et al. 2022

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In the presented work, B4C was irradiated with xenon swift heavy ions at the energy of 167 MeV. The irradiation of the substrate was done at room temperature to a fluence of 3.83 × 1014 ion/cm2. The samples were then analyzed with the X-ray diffraction technique to study the structural modification, as it can probe the region of penetration of xenon atoms due to the low atomic number of the two elements involved in the material under study. The nano-cluster formation under ion irradiation was observed. Positron lifetime (PLT) calculations of the secondary point defects forming nanoclusters and introduced into the B4C substrate by hydrogen and helium implantation were also carried out with the Multigrid instead of the K-spAce (MIKA) simulation package. The X-ray diffraction results confirmed that the sample was B4C and it had a rhombohedral crystal structure. The X-ray diffraction indicated an increase in the lattice parameter due to the Swift heavy ion (SHI) irradiation. In B12-CCC, the difference between τ with the saturation of H or He in the defect is nearly 20 ps. Under the same conditions with B11C-CBC, there is approximately twice the value for the same deviation.

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Study of Neutron Induced Defects in Ceramics using the GiPS Facility

Cited by 4 publications

References 9 publications

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

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

ELBE Center for High-Power Radiation Sources

Modeling and X-ray Analysis of Defect Nanoclusters Formation in B4C under Ion Irradiation

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