Autor: Courtois, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On the Crystal and Magnetic Behavior οf $ScFe_{4}Al_{8}$ Single Crystal
Autorzy:: Rećko, K.
Dobrzyński, L.
Lemée-Cailleau, M.
Waliszewski, J.
Talik, E.
Suski, W.
Courtois, P.
Powiązania:: https://bibliotekanauki.pl/articles/1810469.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.05.fm
61.05.cp
Opis:: Nuclear and magnetic properties of the $ScFe_{4}Al_{8}$ single crystal were found to exhibit unparalleled complexity of nuclear and magnetic structures. Our previous neutron measurements revealed presence of two modulation vectors, both along [ε, ε, 0], however with different critical temperatures. Recent experiments forced us to revise our knowledge of the structural ordering in the sample. So far, the crystal structure of this alloy, being of $ThMn_{12}$-type, has never been questioned.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 206-208
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A Tesla Transformer and a Coaxial Peaking Switch as a UWB Pulse Source
Autorzy:: Amal, Y.
Pecastaing, L.
Rivaletto, M.
Reess, T.
Pignolet, P.
Cassany, B.
Ferron, A.
Courtois, L.
Merle, E.
Powiązania:: https://bibliotekanauki.pl/articles/1807938.pdf
Data publikacji:: 2009-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 84.70.+p
07.57.Hm
84.30.Ng
Opis:: This paper presents a high voltage pulse source which is able to generate ultra wideband (UWB) pulses during about 1 ns through a 16 antennas array. This UWB source is composed of a 50 kV DC voltage supply, a Tesla transformer to amplify this voltage up to 400 kV, a gaseous pressurized peaking switch and an impedance transformer (50 Ω → 3.125 Ω). This output impedance value corresponds to the input impedance value of a sixteen 50 Ω antennas array. That is why a distributor is needed in order to feed the antenna array. In this paper, the peaking switch and the capacitive line divider used to characterise the generated pulses are particularly described. The peaking switch is based on the principle of a line discharge by means of a high pressure gas switch. It is loaded with a Tesla transformer to obtain a good pulse reproducibility. The main characteristics of the output pulse waveform (amplitude and rise time) are linked to the properties of the gas switch and particularly to the gap distance, the pressure and the nature of the gas used in the switch filling. The aim is to find a good compromise between various parameters as the output pulse amplitude, the rise time and the repetition rate in order to ensure a better efficiency of the UWB source. Classical voltage measurement techniques do not allow us an estimation of the main characteristics of such an output signal. Therefore a voltage probe was designed and realised to measure both the amplitude and the rise time of the pulses delivered by the generator. This device is based on the principle of a capacitive line divider. Calibration tests (transient and frequency tests) were performed and show that the high cut-off frequency, around 2.5 GHz, is consistent with the transient response of the output high voltage waveform. The design, realisation and calibration tests are also presented.
Źródło:: Acta Physica Polonica A; 2009, 115, 6; 1115-1117
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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