Publikační činnost - 13000http://hdl.handle.net/10467/31472024-03-29T14:52:28Z2024-03-29T14:52:28ZHodnocení dopadů měkkých nástrojů v rámci naplňování cílů energetické efektivnostiValentová, MichaelaKnápek, JaroslavKarásek, JiříKrálík, Tomášhttp://hdl.handle.net/10467/785822018-11-01T13:56:36Z2017-01-01T00:00:00ZHodnocení dopadů měkkých nástrojů v rámci naplňování cílů energetické efektivnosti
Valentová, Michaela; Knápek, Jaroslav; Karásek, Jiří; Králík, Tomáš
Publikace poskytuje návod jak systematický hodnotit měkké nástroje tak, aby byl zřejmý jejich přínos pro plnění cílů v rámci směrnice o energetické účinnosti a také jejich přínos pro další nastavení nástrojů energetické efektivnosti. Obecné postupy hodnocení jsou podrobně testovány na dvou vybraných nástrojích realizovaných v České republice – energetickém poradenství EKIS a vzdělávacích seminářích v oblasti energetické efektivnosti; The report provides a methodology to evaluate soft (information) energy efficiency measures. It also tests the method on two case studies of soft energy efficiency measures - information provision and trainings.
2017-01-01T00:00:00ZDeuterium z-pinch as a powerful source of multi-MeV ions and neutrons for advancedKlír, D.Shishlov, A. V.Kokshenev, V. A.Kubeš, P.Řezáč, K.Cikhardt, J.Cikhardtová, B.Kravárik, J.http://hdl.handle.net/10467/756462018-04-24T09:33:43Z2016-01-01T00:00:00ZDeuterium z-pinch as a powerful source of multi-MeV ions and neutrons for advanced
Klír, D.; Shishlov, A. V.; Kokshenev, V. A.; Kubeš, P.; Řezáč, K.; Cikhardt, J.; Cikhardtová, B.; Kravárik, J.
A novel configuration of a deuterium z-pinch has been used to generate a nanosecond pulse of fast ions and neutrons. At a 3 MA current, the peak neutron yield of (3.6 ± 0.5) × 1012 was emitted within 20 ns implying the production rate of 1020 neutrons/s. High neutron yields resulted from the magnetization of MeV deuterons inside plasmas. Whereas deuterons were trapped in the radial direction, a lot of fast ions escaped the z-pinch along the z-axis. A large number of >25 MeV ions were emitted into a 250 mrad cone. The cut-off energy of broad energy spectra of hydrogen ions approached 40 MeV. The total number of >1 MeV and >25 MeV deuterons were 1016 and 1013, respectively. Utilizing these ions offers a real possibility of various applications, including the increase of neutron yields or the production of short-lived isotopes in samples placed in ion paths. On the basis of our experiments with various samples, we concluded that a single shot would have been sufficient to obtain GBq positron activity of 13N isotopes via the 12C(d,n)13N reaction. Furthermore, the first z-pinch generated neutron radiograph produced by ≈20 ns pulses is presented in this paper.
2016-01-01T00:00:00ZEfficient neutron production from sub-nanosecond laser pulse accelerating deuteronsKlír. D.Krasa, J.Cikhardt, J.Dudzak, R.Krousky, E.Pfeifer, MŘezáč, K.Šíla, O.http://hdl.handle.net/10467/756442018-04-24T07:59:06Z2015-01-01T00:00:00ZEfficient neutron production from sub-nanosecond laser pulse accelerating deuterons
Klír. D.; Krasa, J.; Cikhardt, J.; Dudzak, R.; Krousky, E.; Pfeifer, M; Řezáč, K.; Šíla, O.
Neutron-producing experiments have been carried out on the Prague Asterix Laser System. At the fundamental wavelength of 1.315 μm, the laser pulse of a 600 J energy and 300 ps duration was focused on a thick deuterated-polyethylene target. Neutron yields reached (4.1 ± 0.8) × 108 at the peak intensity of ≈3 × 1016 W/cm2. A more detailed analysis of neutron time-of-flight signals showed that a significant fraction of neutron yields was produced both by the 2H(d,n)3He reaction and by other neutron-producing reactions. Neutron energies together with delayed neutron and gamma emission showed that MeV deuterons escaped from a laser-produced plasma and interacted ≈50 ns later with a borosilicate blast-shield glass. In order to increase DD neutron yields and to characterize deuteron beams via nuclear reactions, a secondary deuterated polyethylene target was used in a pitcher-catcher scheme at the target front side. In this experimental arrangement, the neutron yield reached (2.0 ± 0.5) × 109 with the peak neutron fluence of (2.5 ± 0.5) × 108 n/sr. From the neutron yield, it was calculated that the secondary target was bombarded by 2 × 1014 deuterons in the 0.5–2.0 MeV energy range. The neutron yield of 2 × 109 at the laser energy of 600 J implied the production efficiency of 3 × 106 n/J. A very important result is that the efficient neutron production was achieved with the low contrast, sub-nanosecond laser pulse of the intensity of 1016 W/cm2. The latter parameters can be achieved in a rep-rate mode more easily than ultra-high intensities and contrasts.
2015-01-01T00:00:00ZEfficient Neutron Production from a Novel Configuration of Deuterium Gas-Puff Z-PinchKlír, DanielKubeš, P.Řezáč, K.Cikhardt, J.Kravárik, J.Šíla, O.Shishlov, A.Kovalchuk, B.http://hdl.handle.net/10467/756422018-04-24T09:47:42Z2014-01-01T00:00:00ZEfficient Neutron Production from a Novel Configuration of Deuterium Gas-Puff Z-Pinch
Klír, Daniel; Kubeš, P.; Řezáč, K.; Cikhardt, J.; Kravárik, J.; Šíla, O.; Shishlov, A.; Kovalchuk, B.
A novel configuration of a deuterium z pinch has been used to generate fusion neutrons. Injecting an outer hollow cylindrical plasma shell around an inner deuterium gas puff, neutron yields from DD reactions reached Y-n = (2.9 +/- 0.3) x 10(12) at 700 ns implosion time and 2.7 MA current. Such a neutron yield means a tenfold increase in comparison with previous deuterium gas puff experiments at the same current generator. The increase of beam-target yields was obtained by a larger amount of current assembled on the z-pinch axis, and subsequently by higher induced voltage and higher energies of deuterons. A stack of CR-39 track detectors on the z-pinch axis showed hydrogen ions up to 38 MeV. Maximum neutron energies of 15 and 22 MeV were observed by radial and axial time-of-flight detectors, respectively. The number of DD neutrons per one joule of stored plasma energy approached 5 x 10(7). This implies that deuterium gas puff z pinches belong to the most efficient plasma-based sources of DD neutrons.
2014-01-01T00:00:00Z