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    Wyświetlanie 1-8 z 8
    Tytuł:
    Conceptual design of Light Impurity Monitor for Wendelstein 7-X
    Autorzy:
    Książek, I.
    Burhenn, R.
    Musielok, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146640.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma spectroscopy
    stellarator
    soft X-ray
    Opis:
    As plasma impurity ions can significantly influence the properties of a fusion plasma by dilution and enhancement of the radiation losses, the process of monitoring of their concentrations is one of the most important tasks. A Light Impurity Monitor is needed for monitoring the contamination of the stellarator plasma by carbon, nitrogen, boron, and oxygen impurities, which are indicators for the overload of the plasma facing components, leakage of the vacuum vessel, or wall condition, respectively. Their concentration will be estimated on the basis of emission intensities of their hydrogen-like ions. In this paper a conceptual design of such a spectrometer is presented, including the description of the geometry, the acquisition system and safety systems.
    Źródło:
    Nukleonika; 2011, 56, 2; 155-160
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Second order reflection from crystals used in soft X-ray spectroscopy
    Autorzy:
    Książek, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146093.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    soft X-ray
    plasma spectroscopy
    PbSt
    KAP
    Opis:
    In this note the ratio of the second to the first order reflection is determined for the KAP and PbSt crystals, for wavelengths corresponding to the Al K-line emission. The source of the radiation was a low-voltage stabilized X-ray tube. The X-rays were detected with a Bragg spectrometer equipped with a proportional counter detector. The signal measured by the proportional counter was subsequently pulse height analyzed.
    Źródło:
    Nukleonika; 2015, 60, 2; 263-265
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of soft X-ray tomography on the COMPASS tokamak
    Autorzy:
    Imríšek, M.
    Mlynář, J.
    Löffelmann, V.
    Weinzettl, V.
    Odstrčil, T.
    Odstrčil, M.
    Tomeš, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146251.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    soft X-ray
    tomography
    Tikhonov regularization
    tokamak
    Opis:
    The COMPASS tokamak is equipped with the soft X-ray (SXR) diagnostic system based on silicon photodiode arrays shielded by a thin beryllium foil. The diagnostic is composed of two pinhole cameras having 35 channels each and one vertical pinhole camera with 20 channels, which was installed recently to improve tomographic inversions. Lines of sight of the SXR detectors cover almost complete poloidal cross section of the COMPASS vessel with a spatial resolution of 1–2 cm and temporal resolution of about 3 s. Local emissivity is reconstructed via Tikhonov regularization constrained by minimum Fisher information that provides reliable and robust solution despite limited number of projections and ill-conditionality of this task. Improved border conditions and numerical differentiation matrices suppressing artifacts in reconstructed radiation were implemented in the code. Furthermore, a fast algorithm eliminating iterative processes was developed, and it is foreseen to be tested in real-time plasma control.
    Źródło:
    Nukleonika; 2016, 61, 4; 403-408
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Refined design of a new driver for fast capillary discharge
    Autorzy:
    Koláček, K.
    Boháček, V.
    Šunka, P.
    Řípa, M.
    Kravárik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148339.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fast capillary discharge
    soft X-ray laser
    Opis:
    A new driver of the fast capillary discharge has been designed. It consists of the Marx generator and radial Blumline pulse forming line. Such a geometry enables axial access to both capillary ends (”transparent capillary”). This arrangement substantially simplifies the experiments (adjustment, monitoring, applications). The designed apparatus is capable of reaching the discharge current of the order of 120 kA and the discharge current rise time 2.9×1012 A/s, which is sufficient for the investigation of amplification in non-traditional electronic transitions.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 45-47
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Refined design of a new driver for fast capillary discharge
    Autorzy:
    Kolácek, K.
    Bohacek, V.
    Schmidt, J.
    Sunka, P.
    Ripa, M.
    Kravárik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147571.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fast capillary discharge
    soft X-ray laser
    Opis:
    A new driver of the fast capillary discharge has been designed. It consists of the Marx generator and radial Blumline pulse forming line. Such a geometry enables axial access to both capillary ends ("transparent capillary"). This arrangement substantially simplifies the experiments (adjustment, monitoring, applications). The designed apparatus is capable of reaching the discharge current of the order of 120 kA and the discharge current rise time 2.9×1012 A/s, which is sufficient for the investigation of amplification in non-traditional electronic transitions.
    Źródło:
    Nukleonika; 2001, 46, 3; 117-120
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent progress in 1 MJ Plasma-Focus research
    Autorzy:
    Scholz, M.
    Karpiński, L.
    Paduch, M.
    Tomaszewski, K.
    Miklaszewski, R.
    Szydlowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147553.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutron emission
    plasma focus
    scaling laws
    soft X-ray radiation
    Opis:
    The paper reports on actual operational characteristics of the PF-1000 facility and it presents results of the first neutron experiments performed with a new set of large Mather-type electrodes, which were designed for shots up to 1000 kJ. Dynamics of a current-sheath was studied by means of two high-speed streak cameras and a two-frame camera. The last one was used for the side-on observation of the pinch column. The high-speed streak pictures were taken side-on behind slits oriented in the radial or axial direction. On the basis of the pictures taken behind the radial slit, average values of the radial compression and expansion velocities were estimated. Time-resolved X-ray signals were measured with PIN diodes covered by different filters, and they were compared with other traces (voltage waveforms, dI/dt signals, and neutron-induced pulses) in order to determine their correlation. The total neutron yield (Ytot), i.e. the number of neutrons produced during a single discharge and emitted in various directions, was measured by means of several silver-activation detectors placed at different angles around the PF-1000 experimental chamber.
    Źródło:
    Nukleonika; 2001, 46, 1; 35-39
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of low-temperature plasmas formed in low-density gases surrounding laser-produced plasmas
    Autorzy:
    Majszyk, Mateusz
    Bartnik, Andrzej
    Skrzeczanowski, Wojciech
    Fok, Tomasz
    Węgrzyński, Łukasz
    Szczurek, Mirosław
    Fiedorowicz, Henryk
    Powiązania:
    https://bibliotekanauki.pl/articles/2202566.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    extreme ultraviolet
    EUV
    laser plasma
    low pressure
    photoionization
    plasma
    soft X-ray
    SXR
    Opis:
    Low-temperature plasma production is possible as a result of photoionization using high-intensity extreme ultraviolet (EUV) and soft X-ray (SXR) pulses. Plasma of this type is also present in outer space, e.g., aurora borealis. It also occurs when high-velocity objects enter the atmosphere, during which period high temperatures can be produced locally by friction. Low-temperature plasma is also formed in an ambient gas surrounding the hot laser-produced plasma (LPP). In this work, a special system has been prepared for investigation of this type of plasma. The LPP was created inside a chamber fi lled with a gas under a low pressure, of the order of 1–50 mbar, by a laser pulse (3–9 J, 1–8 ns) focused onto a gas puff target. In such a case, the SXR/EUV radiation emitted from the LPP was partially absorbed in the low-density gas. In this case, high- and low-temperature plasmas (Te ~100 eV and ~1 eV, respectively) were created locally in the chamber. Investigation of the EUV-induced plasmas was performed mainly using spectral methods in ultraviolet/visible (UV/VIS) light. The measurements were performed using an echelle spectrometer, and additionally, spatial–temporal measurements were performed using an optical streak camera. Spectral analysis was supported by the PGOPHER numerical code.
    Źródło:
    Nukleonika; 2023, 68, 1; 11--17
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    0.2-kJ and 2-kJ high rep rate Dense Plasma foci : their design, technology, and applications
    Autorzy:
    Dubrovsky, A. V.
    Gribkov, V. A.
    Ivanov, Y. P.
    Lee, P.
    Lee, S.
    Liu, M.
    Samarin, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146546.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    DPF installation
    miniature focus chamber
    soft and hard X-ray radiation
    Opis:
    The paper presents various designs of several medium and small size Dense Plasma Focus (DPF) chambers intended for numerous applications, a description of technologies used in these facilities, and some results reached with these devices by using a number of diagnostic techniques. In present experiments the DP foci have been used mainly as an X-ray source. We discuss here how it is possible to satisfy absolutely new and very strict demands on the construction and technology for the devices to be eventually applied in science and industry. Between these characteristics there are a high repetition rate (typically 1…15 Hz) and a long lifetime (over 1 million shots). Their switching elements, a collector and chambers must withstand a high quasi-continuous heat load (up to 100 kW). High energy density in the central part of the chamber anode and the necessity to provide a channel for radiation extraction demanded a special construction and specific materials implementation in this region. Their X-ray spectrum should be tuned. They have to operate with different working gases and preferably in a wide range of pressures. All these points are discussed in this report. Capabilities of the described techniques are illustrated by results of the recent experimental studies carried out with facilities located at the Nanyang Technological University (NX1) as well as at the Lebedev Physical Institute (PF-0.2).
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 107-111
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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