Results 261 to 270 of about 292,271 (308)

Wall Conditioning on HL-1M

Plasma Science and Technology, 2001
The wall conditioning methods including DC glow discharge, boronization and siliconization on HL-1M are reviewed. The DC glow discharge with helium is routinely used to decrease impurities and recycling. The DC glow discharge is also used for wall boronization or siliconization and the removal of coated film.
Wang Zhi-wen, Wang En-yao, Zhang Nian-man, Wang Min-xu, Yan Dong-hai   +4 more
openaire   +1 more source

Wall conditioning in JT-60

Journal of Nuclear Materials, 1987
Abstract The vacuum vessel of JT-60 has a volume of 160 m 3 and a vacuum side surface of 2750 m 2 containing the surfaces of the first wall and many types of ports. The first wall is made of 20 μm TiC coated molybdenum and Inconel 625, bolted to the inner surface of the vacuum vessel.
T. Arai, M. Yamamoto, N. Akino, K. Kodama, H. Nakamura, S. Niikura, H. Takatsu, M. Shimizu, M. Ohkubo, M. Ohta   +9 more
openaire   +1 more source

Wall conditioning with lithium evaporation

Journal of Nuclear Materials, 1995
Thin lithium layers are deposited on metal or graphite walls by evaporation in vacuum. Clean lithium surfaces have wide chemical activities on such gases as O 2 , CO and CH 4 . In particular, a strong gettering effect on oxygen is observed; the minimum number of 0 atoms gettered by the lithium layer is about one half the total number of Li atoms ...
H. Sugai, H. Toyoda, K. Nakamura, K. Furuta, M. Ohori, K. Toi, S. Hirokura, K. Sato   +7 more
openaire   +1 more source

Molecular wall effects: Are conditions at a boundary “boundary conditions”?

Physical Review E, 2000
This paper addresses and answers "no" to the question of whether the literal molecular-dynamically-derived species velocities prevailing at a solid surface bounding a two-component fluid continuum undergoing molecular diffusion constitute the appropriate species-velocity boundary conditions to be imposed upon the fluid continuum.
H, Brenner, V, Ganesan
openaire   +2 more sources

A modified wall boundary condition for multi-perforated walls

International Journal of Heat and Mass Transfer, 2013
Abstract In this work, an analytical solver has been developed to evaluate the mass, momentum and energy transfer from the high pressure (generally cold) side to the low pressure (generally hot) side of a multiperforated plate. This solver has been implemented into a CFD code to connect the boundary conditions on both sides of the plate.
Ph. Grenard, D. Scherrer
openaire   +1 more source

Wall conditioning of JET with the ITER-Like Wall

Journal of Nuclear Materials, 2013
The initial conditioning cycle of \{JET\} ILW\} is analysed and compared with restart and operation in 2008 with a carbon dominated wall. Comparable water and oxygen decay times are observed during bake-out in both cases. Despite a 2 × 10−3 mbar l/s leak rate during plasma operation, no further wall conditioning has been necessary after plasma restart ...
Douai, D., Brezinsek, S., Esser, H.G., Joffrin, E., Keenan, T., Knipe, S., Kogut, D., Lomas, P.J., Marsen, S., Nunes, I., Philipps, V., Pitts, R.A., Shimada, M., de Vries, P.   +13 more
openaire   +3 more sources

Initial wall conditioning in Doublet III

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1983
The first year of operation of Doublet III, a large noncircular tokamak (R=1.43 m, a=0.45 m, BT ≤2.6 T), was highlighted by the achievement of a plasma current in excess of 2 MA. This is partially attributed to the low Zeff discharges made possible by wall conditioning using low temperature, low power discharge cleaning, accompanied by preconditioning ...
G. L. Jackson, R. E. Clausing, A. F. Lietzke, S. Ejima, L. C. Emerson, L. Heatherly   +5 more
openaire   +1 more source

Magnetogasdynamic Boundary Conditions at a Conducting Wall

The Physics of Fluids, 1964
Velocity boundary conditions at a conducting wall have been developed for the continuum magnetogasdynamic equations. The wall is separated from the fully ionized plasma by a Langmuir type sheath. The effects of the sheath on the single fluid plasma boundary conditions are studied for the case where the particle gyro period is large compared to its ...
Luzzi, T. E., Gross, R. A.
openaire   +1 more source

Dry-Wall Survival under IFE Conditions

Fusion Science and Technology, 2004
The chamber wall armor is subject to demanding conditions in inertial fusion energy (IFE) chambers. IFE operation is cyclic in nature, and key issues are (a) chamber evacuation to ensure that after each shot the chamber returns to a quiescent state in preparation for the target injection and the firing of the driver for the subsequent shot and (b ...
A. R. Raffray, L. El-Guebaly, G. Federici, D. Haynes, F. Najmabadi, D. Petti   +5 more
openaire   +1 more source

GAS-WALL INTERACTIONS UNDER RAREFIED CONDITIONS

2016
The past decade has seen a considerable growth in portable devices with mobile connectivity. This growth has been enabled by the development of high capacity telecommunication networks globally. Individuals require high data transfer capabilities to remotely stream large information sets (i.e.
Frijns, Arjan, Nedea, Silvia, Stafford, Jason, Perrier, Pierre, Graur, Irina   +4 more
openaire   +2 more sources