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47
Helium Transport And Exhaust In Tokamaks
"... INTRODUCTION The fourth in a series of workshops on issues of helium transport and exhaust in tokamaks, held under the auspices of the International Energy Agency, and sponsored by Oak Ridge National Laboratory and by Forschungszentrum KFA/Juelich, was held from 18 to 21 October 1999 in Jekyll Isla ..."
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INTRODUCTION The fourth in a series of workshops on issues of helium transport and exhaust in tokamaks, held under the auspices of the International Energy Agency, and sponsored by Oak Ridge National Laboratory and by Forschungszentrum KFA/Juelich, was held from 18 to 21 October 1999 in Jekyll
HELIUM-LIKE ATOMS
"... In the article the theory of helium-like atoms is given The constitution of atom is a corollary of aspiration of any system to a minimum of a potential energy, instead of any selection rules or certain composition of quantum numbers. The aspiration to a minimum of a potential energy is sufficient, e ..."
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In the article the theory of helium-like atoms is given The constitution of atom is a corollary of aspiration of any system to a minimum of a potential energy, instead of any selection rules or certain composition of quantum numbers. The aspiration to a minimum of a potential energy is sufficient
unknown title
"... Abstract. The W-shaped divertor of JT-60U was modified from inner-leg pumping to both-leg pumping. After the modification, the pumping rate was improved from 3 % with inner-leg pumpi g to 5 % with both-leg pumping in a divertor-closure configuration, which means both separatrixes close to the divert ..."
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to the divertor slots. Efficient helium exhaust was realized in the divertor-closure configuration with both-leg pumping. A global particle confinement time of *He = 0.4 s and *He / E = 3 was achieved in attached ELMy H-mode plasmas. The helium exhaust efficiency with both-leg pumping was extended by 45
RETRACTABLE HELIUM TRANSFER LINES FOR THE FLOATING FUSION MAGNET
"... Retractable transfer lines are used to cool the Levitated Dipole Experiment super-conducting Floating Coil. The lines supply and exhaust coolant to the heat ex-changer of the magnet located in the vacuum chamber. When the magnet is cooled and inductively charged the lines are retracted, the magnet p ..."
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Retractable transfer lines are used to cool the Levitated Dipole Experiment super-conducting Floating Coil. The lines supply and exhaust coolant to the heat ex-changer of the magnet located in the vacuum chamber. When the magnet is cooled and inductively charged the lines are retracted, the magnet
Exhaust of Underexpanded Jets from Finite Reservoirs
"... We examine the response of an underexpanded jet to a depleting, nite reservoir with experiments and simulations. An open-ended shock tube facility with variable reservoir length is used to obtain images of nitrogen and helium jet structures at successive instances during the blowdown from initial p ..."
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We examine the response of an underexpanded jet to a depleting, nite reservoir with experiments and simulations. An open-ended shock tube facility with variable reservoir length is used to obtain images of nitrogen and helium jet structures at successive instances during the blowdown from initial
Acoustic Simulation of Hot Coaxial Jets using Cold Helium-Air Mixture Jets
"... This work examines the ability of small-scale, helium-air-mixture, coaxial jets to capture the acoustics of large-scale hot jets representing the exhaust of separate-flow turbofan engines. ..."
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Cited by 3 (3 self)
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This work examines the ability of small-scale, helium-air-mixture, coaxial jets to capture the acoustics of large-scale hot jets representing the exhaust of separate-flow turbofan engines.
Monte Carlo simulation of helium atoms and ions in JT-60U W-shaped divertor
"... Studies on the transport processes of helium atoms and ions in the divertor region are of great importance to control the helium ash exhaust of a fusion reactor. Some experimental studies have been made so far by injecting helium beams[1] and by puffing gases[2,3] into JT-60U plasmas. However, there ..."
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Studies on the transport processes of helium atoms and ions in the divertor region are of great importance to control the helium ash exhaust of a fusion reactor. Some experimental studies have been made so far by injecting helium beams[1] and by puffing gases[2,3] into JT-60U plasmas. However
Acoustic simulation of coaxial hot air jets using cold helium—air mixture jets
- Journal of Propulsion and Power
"... This work examines the ability of small-scale helium–air mixture coaxial jets to simulate the acoustics of large-scale hot air jets representing the exhaust of separate-flow turbofan engines. Experiments employed a one-eighth-scale model of a separate-flow nozzle used in hot tests at NASA John H. Gl ..."
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Cited by 7 (2 self)
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This work examines the ability of small-scale helium–air mixture coaxial jets to simulate the acoustics of large-scale hot air jets representing the exhaust of separate-flow turbofan engines. Experiments employed a one-eighth-scale model of a separate-flow nozzle used in hot tests at NASA John H
Development of a Floating Piston Expander Control Algorithm for a Collins-Type Cryocooler by
, 2012
"... The multi-stage Collins-type cryocooler uses a floating piston design for the working fluid expansion in each stage. The piston floats between a cold volume, where the working fluid is expanded, and a warm volume. The piston's motion is controlled by opening and closing valves connecting severa ..."
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distribution of the reservoirs for an ideal expander with no helium flow through the piston-cylinder gap. This pressure distribution is dependent on the total mass of helium in pressure reservoirs as well as the points at which the warm helium intake as well as the cold helium exhaust end. The pressures
C © Owned by the authors, published by EDP Sciences, 2013 Asteroseismology of hot B subdwarf stars
"... Abstract. Non-radial pulsations in Extreme Horizontal Branch stars (also known as hot B subdwarfs or sdB stars) offer strong opportunities to study, through asteroseismology, the structure and internal dynamics of stars in this intermediate stage of stellar evolution. Most sdB stars directly descend ..."
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descend from former red giants and are expected to evolve straight into white dwarfs after core helium exhaustion. They thus represent the most direct link between these two stages. Their properties should therefore reflect both the outcome of the core evolution of red giant stars and the initial state
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