Temat: 41.75.Ht - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Volume Free Electron Laser with a "Grid" Photonic Crystal in a Cylindrical Waveguide
Autorzy:: Baryshevsky, V.
Molchanov, P.
Tematy:: 41.60.Cr
41.75.Fr
41.75.Ht
42.79.Dj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1807859.pdf Link otwiera się w nowym oknie
Opis:: Specific features of Volume Free Electron Laser (VFEL) with a photonic crystal made from the wire grids periodically strained in a waveguide are studied theoretically and experimentally. Electrodynamical properties of a "grid" photonic crystal built in a cylindrical waveguide are reported. Possibility to use it for VFEL lasing in wide frequency range is discussed.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 2.

Tytuł:: Advances in High Intensity e-Beam Diode Development for Flash X-Ray Radiography
Autorzy:: Oliver, B.
Hahn, K.
Johnston, M.
Portillo, S.
Tematy:: 41.75.Fr
41.75.Ht
41.50.+h
52.59.Mv
87.59.B-; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1807904.pdf Link otwiera się w nowym oknie
Opis:: Recent experiments at Sandia National Laboratories have demonstrated an electron beam diode X-ray source capable of producing >350 rad at one meter with 1.7 mm FWHM X-ray source distribution, with a 50 ns pulse-width and X-ray photon endpoint energy spectrum in the 6-7 MeV range. The diode operates at current densities of ≈1 MA/$cm^{2}$. The intense electron beam rapidly ( ≈ 5 ns) heats the X-ray conversion anode/target, liberating material in the form of low density ion emission early in the pulse and high density plasma later. This environment gives rise to beam/plasma collective effects which dominate the diode and beam characteristics, affecting the radiation properties (dose and spot-size). A review of the diode operation, the measured source characteristics and the simulation methods and diagnostics used to guide its optimization is given.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 3.

Tytuł:: A Method to Produce Linearly Polarized Positrons and Positronium Atoms with the J-PET Detector
Autorzy:: Mohammed, Muhsin
Białas, P.
Curceanu, C.
Czerwiński, E.
Dulski, K.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Sharma, N.
Sharma, S.
Shivani, ---
Skurzok, M.
Silarski, M.
Wieczorek, A.
Wiślicki, W.
Zgardzińska, B.
Zieliński, M.
Moskal, P.
Tematy:: 41.75.Fr
41.75.Ht
77.22.Ej
36.10.Dr
85.75.Mm
87.57.uk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1030045.pdf Link otwiera się w nowym oknie
Opis:: A method for creating linearly polarized positrons and ortho-positronium (o-Ps) atoms with the J-PET detector is presented. The unique geometry and properties of the J-PET tomography enable one to design a positron source such that the quantization axis for the estimation of the linear polarization of produced o-Ps can be determined on the event by event basis in a direction of the positron motion. We intend to use ²²Na or other β⁺ decay isotopes as a source of polarized positrons. Due to the parity violation in the beta decay, the emitted positrons are longitudinally polarized. The choice of the quantization axis is based on the known position of the positron emitter and the reconstructed position of the positronium annihilation. We show that the J-PET tomography is equipped with all needed components.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: Ion and Electron Beam Induced Luminescence οf Rare Earth Doped YAG Crystals
Autorzy:: Gawlik, G.
Sarnecki, J.
Jóźwik, I.
Jagielski, J.
Pawłowska, M.
Tematy:: 78.60.Hk
52.59.Bi
79.20.Rf
61.80.Lj
41.75.Ak
41.75.Cn
61.72.S-
61.72.-y
29.40.-n
77.84.Bw
79.60.Ht
87.53.Bn
78.55.-m
78.60.-b
77.55.Px
77.55.-g
25.40.Lw; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1504113.pdf Link otwiera się w nowym oknie
Opis:: The aim of this work was the evaluation of ion-beam induced luminescence for the characterization of luminescent oxide materials containing rare earth elements. The yttrium aluminium garnet epilayers doped with Nd, Pr, Ho, and Tm atoms were used. The ion-beam induced luminescence spectra were excited using 100 keV $H_2^{+}$ ion beam and were recorded in the wavelengths ranging from 300 nm up to 1000 nm. The separate parts of the surface of the same samples were used for ion-beam induced luminescence and cathodoluminescence experiments. Cathodoluminescence spectra have been recorded in the range from 370 nm up to 850 nm at 20 keV e-beam in scanning electron microscope equipped with a grating spectrometer coupled with a photomultiplier. The observed narrow ion-beam induced luminescence lines can be ascribed to the well known radiative transitions in the rare-earth ions in the YAG crystals. The cathodoluminescence spectra reveal essentially the same emission lines as ion-beam induced luminescence. The decrease of the ion-beam induced luminescence lines intensity has been observed under the increasing ion fluences. The ion-beam induced luminescence may be used for characterization of transparent luminescent materials as an alternative method for cathodoluminescence and can be especially useful for observation of ion-beam damage formation in crystals.
Dostawca treści:: Biblioteka Nauki

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