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Tytuł:
Important issues in high - current plasma experiments of the Z - pinch type
Autorzy:
Sadowski, M. J.
Scholz, M.
Powiązania:
https://bibliotekanauki.pl/articles/147694.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Z-pinch
X-pinch
wire-array Z-pinch
gas-puffed Z-pinch
plasma focus (PF)
Opis:
This paper is based on an invited lecture given at the 10th International Workshop and Summer School "Towards Fusion Energy", which was held in Kudowa Zdrój, Poland, on June 12–18, 2011. A concise review is presented of the known experimental results on various plasma Z-pinch experiments supplied by high-voltage and high-current pulsed power generators. The most important issues and the most valuable results in this domain are highlighted. A broad class of various Z-pinches is considered, including simple inter-electrode discharges, single exploding wires, so-called X-pinches, cylindrical wire-array Z-pinches, radial wire-array discharges, conical wire-array experiments, and gas-puffed Z-pinches. Non-cylindrical Z-pinch discharges (often called plasma focus experiments) are also briefly characterized. The most important characteristics of each category of experiments are outlined. Particular attention is paid to fusion-oriented high-power Z-pinch experiments and the problems encountered in experiments with various sophisticated fusion targets. The main issues in the described Z-pinch experiments are identified. Finally, new trends in the dense Z-pinch research are described.
Źródło:
Nukleonika; 2012, 57, 1; 11-24
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-spherical superfast Z-pinch implosion for pellet irradiation
Autorzy:
Smirnov, V. P.
Grabovskii, E. V.
Zakharov, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/146366.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Z-pinch
Z-pinch implosion
Opis:
New simulation results of the quasi-spherical implosion induced by a 40 MA current pulse are discussed. Results on a quasi-spherical wire array production and some experimental observations of an implosion are presented.
Źródło:
Nukleonika; 2012, 57, 2; 215-219
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spark ignition in an inertially confined Z-pinch
Autorzy:
Linhart, J.
Bilbao, L.
Powiązania:
https://bibliotekanauki.pl/articles/148578.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ICF ignition
Z-pinch
liners
Opis:
Experiments have shown [3, 9] that a cylindrical liner can successfully confine a magnetized, hot plasma column. The technical parameters necessary for ICF applications being inaccessible so far, we have investigated volume and spark ignition in a D-T plasma compressed by an imploding liner through numerical simulations. These calculations provide an insight into the structure of both the liner and the plasma and indicate the range of parameters required for ignition and detonation in such a liner-pinch system. Typical results, corresponding to physically feasible situations will be shown and means for realising them will be mentioned. Extrapolation to advanced fuels will be briefly outlined.
Źródło:
Nukleonika; 2003, 48, 1; 13-16
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetostatic analysis of a pinch mode magnetorheological valve
Autorzy:
Gołdasz, J.
Sapiński, B.
Powiązania:
https://bibliotekanauki.pl/articles/386794.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
MR fluid
pinch mode
valve
magnetostatic model
Opis:
The study deals with the pinch mode of magnetorheological (MR) fluids’ operation and its application in MR valves. By applying the principle in MR valves a highly non-uniform magnetic field can be generated in flow channels in such a way to solidify the portion of the material that is the nearest to the flow channel’s walls. This is in contrary to well-known MR flow mode valves. The authors investigate a basic pinch mode valve in several fundamental configurations, and then examine their magnetic circuits through magnetostatic finiteelement (FE) analysis. Flux density contour maps are revealed and basic performance figures calculated and analysed. The FE analysis results yield confidence in that the performance of MR pinch mode devices can be effectively controlled through electromagnetic means.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 3; 229-232
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pinch modes in the SPEED2 plasma focus
Autorzy:
Kies, W.
Decker, G.
Berntien, U.
Sidelnikov, U.
Glushkov, D.
Koshelev, K.
Simanovskij, D.
Bobashev, S.
Powiązania:
https://bibliotekanauki.pl/articles/146993.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
pinch plasma
pinch stability
plasma focus
plasma radiation
radiation source
Opis:
Deuterium discharges in the SPEED2 plasma focus (80 kJ, 200 kV, 2 MA, 400 ns) have been found unexpectedly stable within the operational regime as a neutron source. Only at higher filling pressures (above 6 mbar) sometimes m=0 instabilities appeared in the pinch column, especially in discharges of lower efficiency (moderate dynamics and neutron yield). Enhancing the electromagnetic radiation by doping these discharges with heavy gases (e.g. neon, argon) distinctly two pinch modes are produced, the micropinch mode (MPM) or the stable column mode (SCM), with a transition regime where the initial SCM is followed by the MPM. Micropinches are local radiative collapses initiated by m=0 instabilities of low-energy- density pinch plasmas. These instabilities and the successive micropinches can be suppressed by kinetic deuterons produced during dynamical compression of high-energy-density deuterium plasma sheaths. Depending on the relaxation of this fast deuteron component the pinch column can be stabilized for several tens of nanoseconds. While the short-lived (appr. 1 ns) micropinches erratically appear as point-like successive flashes along the pinch axis with temperatures about 1 keV and about solid density the reproducible SCM, optimized with respect to the compression ratio, forms a powerful linear radiation source of temperatures and densities similar to the MPM. The SCM needs powerful (fast) drivers in order to use the kinetic ion stabilization, but not necessarily MA currents as available from the SPEED2 driver. This opens the possibility to establish the SCM also in compact experiments like SPEED3 (8 kJ, 80 kV, 0.8 MA, 300 ns) or even SPEED4 (2 kJ, 40 kV, 250 kA, 300 ns).
Źródło:
Nukleonika; 2001, 46, 1; 9-14
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X pinch as a source for X-ray radiography
Autorzy:
Pikuz, S.
Shelkovenko, T.
Romanova, V.
Sinars, D.
Hammer, D.
Bland, S.
Lebedev, S.
Powiązania:
https://bibliotekanauki.pl/articles/147532.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
wire array
X-pinch
X-ray imaging
X-ray radiography
Z-pinch
Opis:
This article describes several applications and methods using the X pinch as a source of X-ray radiation for the radiography of dense plasma objects. These methods, in general, do not use pinholes, and instead take the advantage of the small size (<1 mm, and in some cases <3 mm) and a short X-ray emission duration (<1 ns) of the radiation source produced by an X pinch. Two of these methods, monochromatic and direct point-projection backlighting, are discussed. Experimental images of exploding wires and wire arrays obtained on the BIN, XP, and MAGPIE generators using these techniques are presented. Also included are detailed measurements made on the XP generator of the emission characteristics of X pinches using different wire materials.
Źródło:
Nukleonika; 2001, 46, 1; 21-25
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical setup and physical properties Technical setup and physical properties of a gas-liner pinch
Autorzy:
Büscher, S.
Wrubel, T.
Kunze, H.
Powiązania:
https://bibliotekanauki.pl/articles/146803.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
lineshapes
spectroscopy
Z-pinch
Opis:
he present technical status and physical properties of the gas-liner pinch device in Bochum are presented and discussed. This comprises spectroscopic as well as diagnostic achievements. A short review on the measurements performed at this light source will also be given.
Źródło:
Nukleonika; 2000, 45, 3; 167-172
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A fusion-fission hybrid reactor driven by high-density pinch plasmas
Autorzy:
Zoita, V.
Lungu, S.
Powiązania:
https://bibliotekanauki.pl/articles/146261.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
CANDU
high-density pinch
hybrid reactor
plasma focus
Opis:
A conceptual design for a 200 MW hybrid fusion-fission reactor to be used as a heat source for district heating has been developed. The fission, heat-generating blanket is based on the CANDU reactor technology, while the fusion fast neutrons are provided by a high-density, pinch plasma. The basic assumption regarding the fusion neutron source is that in a pinch plasma (high-density Z-pinch and plasma focus configurations have been considered) a fusion power level of 10 MW can be achieved. An outstanding feature of the design is that no active components are necessary within the reactor containment area, all the hybrid system control being ensured by the fusion component of the reactor.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 81-84
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the influence of a carbon solid on the properties of a helium plasma in a theta pinch discharge
Autorzy:
Freese, W.
Kunze, H.
Powiązania:
https://bibliotekanauki.pl/articles/146807.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
shock wave
spectroscopy
theta pinch
Opis:
A helium plasma produced in a 82 kJ theta pinch discharge has been seeded with carbon ions by a carbon solid rod positioned on the axis. The first shock front of the discharge ablates carbon atoms from the solid surface which are ionized and interact with the plasma. Some shock front properties (namely thickness, compression velocity and its shape) were analyzed with an ICCD-camera system taking 2-dimensional photos of the plasma continuum emitted along the axis with a time duration of 100 ns. While the influence on the shape was not found, the temporal behaviour was drastically changed when the rod was added. The shock front occurs earlier and compresses faster. An explanation remains to be given. Furthermore, the influence of the carbon impurities on the plasma parameters has been investigated by measuring the electron temperature and density by means of plasma spectroscopy comparing these results with those obtained from discharges in helium without rod. We found a decrease in the electron density about 500 ns after the shocked plasma has started to interact with the rod surface. Simultaneously increasing continuum emission and decreasing intensity of the HeII Pa line indicates a regime of recombination. No influence was found on the electron temperature.
Źródło:
Nukleonika; 2000, 45, 3; 173-177
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of a small gas-puff Z-pinch device
Autorzy:
Luo, C.
Wang, X.
Zou, X.
Powiązania:
https://bibliotekanauki.pl/articles/147416.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Z-pinch plasma
plasma diagnostics
multi-frame interferometry
electron density
energy spectra of ion beams
Opis:
A small gas puff Z-pinch device has been constructed and operated. The device has the parameters: the capacitance of energy storage capacitors 16 mi F, charging voltage 22 kV, peak current 210 kA and a quarter of current period 2.4 mi s. A three-frame Mach-Zehnder interferometer and a compact Thomson ion energy analyzer were developed for Z-pinch plasma experiment. According to the results of diagnostics, the electron density ne of the plasma right before pinch instant is larger than 5.4 × 1019/cm3, the corresponding pinch velocity v of the plasma sheath is 9.0 cm/ěs. Clear parabolas produced by neon ions Ne+, Ne2+, Ne3+ and Ne4+ on CR-39 target have been observed. The energy spectra dN/dTdů for Ne+, Ne2+, Ne3+ and Ne4+ ions were determined. The highest energies of Ne+, Ne2+, Ne3+ and Ne4+ ions emitted from our Z-pinch plasma are below 1.3 MeV.
Źródło:
Nukleonika; 2006, 51, 1; 43-46
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of deuteron motion in a filamentary Plasma-Focus pinch column for different configurations of filaments
Autorzy:
Pasternak, A.
Sadowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/146934.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
deuterons
filamentary pinch
ion trajectories
numerical modeling
plasma focus
Opis:
The motion of deuterons in dynamical filamentary configurations of a PF pinch column has been studied with a three-dimensional numerical model. Apart from magnetic fields, the motion-induced electrical fields as well as ion-ion and ion-electron collisions have been included in the equations of deuteron motion. Calculations were performed for different numbers of filaments and its spatial distributions under different initial conditions. Energy of ions was assumed to be from 10 keV up to 200 keV. The results obtained have shown many possible modes of ion motion and have demonstrated that the current filaments can cause peculiarities observed in the angular distribution of deuterons emitted from the PF pinch column.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 29-32
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of initial vapor density in Z-pinch polyacetal capillary discharge
Autorzy:
Vrba, P.
Vrbová, M.
Kálal, M.
Janačárek, A.
Fojtík, A.
Powiązania:
https://bibliotekanauki.pl/articles/146587.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
capillary discharge
electrical discharge
laser ablation
snow-plow model
Z-pinch
Opis:
An analysis of a Z-pinch in a capillary discharge is presented. It is supposed that the capillary is filled with a material ablated from the wall using a subnanosecond laser pulse of an energy of several tens of milijoules. The optimum initial atom density N0 has been found.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 25-27
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projekt i budowa chwytaka szczypcowego o chwycie równoległym
Design and construction of a pinch grip gripper parallel
Autorzy:
Filipek, P.
Koter, D.
Szymański, A.
Powiązania:
https://bibliotekanauki.pl/articles/254280.pdf
Data publikacji:
2013
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
chwytak szczypcowy
roboty przemysłowe
pinch gripper
industrial robots
Opis:
W artykule przedstawiono wirtualny projekt, obliczenia oraz rzeczywistą konstrukcję chwytaka szczypcowego o równoległym sposobie chwytania elementów. Zawarto założenia konstrukcyjne i parametry modelu. Jako elementu wykonawczego użyto dobranego na podstawie obliczeń silnika DC z przekładnią ślimakową. Przeprowadzono również analizę wytrzymałościową chwytaka w programie Abaqus.
This paper presents a virtual design, calculations and the actual construction of parallel gripper pinch gripping manner. The contents of design intent and parameters of the model. As the actuator used selected on the basis of calculations of DC motor with worm gear. An analysis of endurance gripper in the Abaqus.
Źródło:
TTS Technika Transportu Szynowego; 2013, 10; 1447-1457, CD
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of corpuscular emission from the Prague Capillary Pinch
Autorzy:
Skladnik-Sadowska, E.
Baranowski, J.
Sadowski, M.
Kolácek, K.
Ripa, M.
Ctibor, P.
Kishinets, A.
Rupasov, A.
Powiązania:
https://bibliotekanauki.pl/articles/147142.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
capillary pinch
corpuscular flux
track detectors
X-radiation
Opis:
The paper presents results of preliminary measurements of the corpuscular radiation from fast z-pinch discharges, which were performed at the Prague Capillary Pinch facility within a frame of the Czech-Polish scientific collaboration programme. Time-integrated measurements were performed by means of a pinhole camera, equipped with nuclear track detectors of the CR-39 type. In order to perform time-resolved measurements the use was made of a single Faraday-type collector and a double-cup system. It was demonstrated that the fast capillary discharges can emit not only pulses of intense visible radiation and soft X-rays, but also pulses of the corpuscular radiation. An optical analysis of the particle tracks was performed. The particle flux at a distance of 20 cm from the collimator outlet was estimated to be 3.5×107 particles/cm2.
Źródło:
Nukleonika; 2002, 47, 1; 31-37
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Retrofitting Heat Exchanger Network of Industrial Ethylene Glycol Plant using Heat Integration based on Pinch Analysis
Autorzy:
Ali, Emad
Wazeer, Irfan
Almutlaq, Abdulaziz
Rallapalli, Jagan
Hadj-Kali, Mohamed K.
Powiązania:
https://bibliotekanauki.pl/articles/2106483.pdf
Data publikacji:
2022
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Heat Integration
Pinch Analysis
Ethylene Glycol
Minimum Utility
Opis:
Heat integration by pinch method is used to modify the heat exchanger network of an industrial ethylene glycol plant. The aim is to reduce the energy cost by operating the plant close to the maximum energy recovery. Pinch analysis identified a pinch temperature of 483 K, a minimum heating utility of 13,490.9 MJ/ton EO, and a minimum cooling utility of 25,697 MJ/ton EO. Using the pinch decomposition diagram and the standard procedure for matching hot and cold streams, a retrofit of the heat exchangers network is developed. The modified heat exchanger network reduces the external cooling duty by 45.5% and the external heating duty by 93.3%. This promising cost savings provide enough justification for restructuring the existing ethylene glycol plant. Moreover, an additional 6% reduction in the external cooling duty can be achieved by integrating the steam turbine below the pinch point.
Źródło:
Polish Journal of Chemical Technology; 2022, 24, 2; 8--20
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł

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