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Results of JET Pellet Fuelling Experiments with Outboard and Inboard Launch
"... The JET pellet centrifuge and flight tube system were modified during 1999 to incorporate an in-vessel track to allow pellet launch from the inboard High Field Side (HFS) of the magnetic axis. The launch point is approximately on the midplane and the trajectory is tangential to the flux surface at n ..."
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The JET pellet centrifuge and flight tube system were modified during 1999 to incorporate an in-vessel track to allow pellet launch from the inboard High Field Side (HFS) of the magnetic axis. The launch point is approximately on the midplane and the trajectory is tangential to the flux surface
A High-Velocity Microwave-Powered Pellet Launcher for ITER
"... Experiments have shown that pellet fuelling of ITER will be optimized by injection of high-speed pellets 3km/s) from a position on the high-field side of the magnetic separatrix. Present ITER plans call for remotely energizing and injecting pellets into a guide tube, which, after several bends, arri ..."
Dynamics of the edge barrier collapse in intrinsic and pellet triggered ELMs
"... Aim and procedure of the investigation A promising solution to the type-I ELM power load problem in ITER is ELM pacing by pellets, as demonstrated experimentally on ASDEX Upgrade [1]. Extrapolation of this technique to ITER requires detailed knowledge about the basic physics involved in ELM onset, n ..."
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-linear electromagnetic ELM phase accompanied by rapid edge energy and particle loss, and finally a slow recovery phase un-til again some precursor activity develops before the next ELM. A pellet launched during the more or less quiescent recovery phase produces a high pressure plasmoid layer, which is supposed to act
Water retention properties and microstructure of bentonite pellets/powder mixture
"... ray micro tomography. In situ compacted MX80 powder/pellets mixture is one of the candidate sealing materials for deep underground repositories, not only because of its low permeability, high swelling capacity and high radionuclide retardation properties but also for operational advantages (lower co ..."
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ray micro tomography. In situ compacted MX80 powder/pellets mixture is one of the candidate sealing materials for deep underground repositories, not only because of its low permeability, high swelling capacity and high radionuclide retardation properties but also for operational advantages (lower
Pellet Fuelling and ELMy H-mode Physics in JET The JET Team 1, prepared by L.D. Horton 1) JET Joint Undertaking, Abingdon, U.K.
"... Abstract. As the reference operating regime for ITER, investigations of the ELMy H-mode have received high priority in the JET experimental programme. Recent experiments have concentrated in particular on operation simultaneously at high density and high confinement using high field side (HFS) pelle ..."
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) pellet launch. The enhanced fuelling efficiency of HFS pellet fuelling is found to scale favourably to a large machine such as JET. The achievable density of ELMy H-mode plasmas in JET has been significantly increased using HFS fuelling although at the expense of confinement degradation back to L
1 FT/P2-23 Alternate Concepts for Generating High Speed DT Pellets for Fueling ITER
"... Abstract. There is a growing concern that the velocity of the DT-ice pellets being proposed to fuel ITER will not have the velocity to effectively penetrate through the pedestal of the plasma edge, because with velocities of only 300 m/s, high field side launched pellets will only penetrate to r /a ..."
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Abstract. There is a growing concern that the velocity of the DT-ice pellets being proposed to fuel ITER will not have the velocity to effectively penetrate through the pedestal of the plasma edge, because with velocities of only 300 m/s, high field side launched pellets will only penetrate to r /a
II. SUMMARY OF PHYSICS DESIGN GUIDELINES — CONVENTIONAL TOKAMAK OPERATION
"... values of elongation and triangularity at 95 % flux surface, and n20 = ne/1020 m-3 = line-average electron density [or n19 = ne/1019], T10 = T/10 keV = average temperature (T ≈ Te ≈ Ti), M = Ai = ave. atomic mass. For simple estimates, profiles can be represented as: n ~ (1 – r2 /a2) αn, T ~ (1 – r2 ..."
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2 /a2) αT + Tped with αn ≈ 0-0.1, αT ≈ 1-1.3 and Tped ~ 2-3 keV = H-mode pedestal temperature, as nominal values. Note that αn ≈ 0-0.1 is consistent with IPB and H-mode profiles with gas or outside-launch pellet fueling in the absence of appreciable internal fueling (e.g., NBI), and that more peaked
BURNING PLASMA PHYSICS ISSUES ILLUSTRATED BY SIMULATIONS OF FIRE
"... Plasma startup and operating issues are examined for a burning plasma using WHIST [1] simulations of the Fusion Ignition Research Experiment (FIRE) design [2]. Fueling and density profile control issues are illustrated through pellet launch from the inboard side of the plasma. Auxiliary fast wave io ..."
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Plasma startup and operating issues are examined for a burning plasma using WHIST [1] simulations of the Fusion Ignition Research Experiment (FIRE) design [2]. Fueling and density profile control issues are illustrated through pellet launch from the inboard side of the plasma. Auxiliary fast wave
Asteroid Retrieval by Rotary Rocket
, 1980
"... A new technique is proposed for recovering asteroid resources. The target asteroid would be equipped with a "rotary rocket " propulsion system consisting of a rapidly spinning, tapered tube of high strength material driven electrically by solar or nuclear power. Pellets of asteroid materia ..."
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material would be released from the tube ends with velocities of a few km/s, achieving specific impulses comparable with the best chemical rockets. The ejected pellets could be launched on trajectories to near-earth space for capture, or they could be expended as reaction mass to bring the remainder
ISSN 1899-5772 Journal of Agribusiness and Rural Development
"... Abstract. Global trends of increase in prices of conventional energy sources, compatibil-ity with trends for environment protection and the necessity to fulfill EU obligations result in price growth of sawmill by-products – raw material for the production of eco-fuels. Such circumstances create a hu ..."
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of refining them in the place where they have been created. Converting sawmill by-products into pellet signifi-cantly increases their value. However, the decision to launch such conversion involves high costs and entails substantial investments, therefore requiring recognition of the fac-tors having an impact
Results 1 - 10
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13
