A New Plasma Surface Interactions Research Facility Pisces B And First Materials Erosion Experments On Boronized Graphite
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A New Plasma Surface Interactions Research Facility
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Author :
language : en
Publisher:
Release Date : 1989
A New Plasma Surface Interactions Research Facility written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
A new plasma-surface interactions research facility: PISCES-B has been designed and constructed at University of California, Los Angeles. The entire vacuum chamber is bakable and a base pressure of the order of 10−8 Torr is attainable using two turbo molecular pumps with a total pumping speed of 6000 l/s. The PISCES-B facility can generate continuous plasmas of argon, helium, hydrogen, deuterium and nitrogen. The density of these plasmas ranges from 1 x 10−11 to 3 x 10−13 cm−3 and the electron temperature ranges from 3 to 51 eV. The plasma bombardment flux to a target surface inserted in the plasma column can be varied from 1 x 1017 to 8 x 1018 ions cm−2 s−1. Due to the high pumping speed, the neutral pressure of the working gas during plasma generation is controllable in the wide range from 3 x 10−5 to 1 x 10−3 Torr. These conditions are similar to those seen at the limiter and divertor areas in toroidal fusion devices. Using the PISCES-B facility, first materials erosion experiments have been conducted on 3% boronized graphites and iso-graphites as the reference materials. The chemical sputtering yield due to hydrogen plasma bombardment at 300 eV for 3% boronized graphite has been found to be about 30% smaller than that for iso-graphites at temperatures from room temperature to 900°C. Also, radiation enhanced sublimation due to hydrogen plasma bombardment at 400 eV is found to be suppressed by 20-30% for 3% boronized graphite at temperatures up to 1300°C. No significant surface composition change is observed after hydrogen plasma bombardment to a fluence of the order of 1022 ions cm−2. 30 refs., 9 figs., 2 tabs.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1990
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Power resources categories.
Encyclopedia Of Interfacial Chemistry
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Author :
language : en
Publisher: Elsevier
Release Date : 2018-03-29
Encyclopedia Of Interfacial Chemistry written by and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-29 with Science categories.
Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry, Seven Volume Set summarizes current, fundamental knowledge of interfacial chemistry, bringing readers the latest developments in the field. As the chemical and physical properties and processes at solid and liquid interfaces are the scientific basis of so many technologies which enhance our lives and create new opportunities, its important to highlight how these technologies enable the design and optimization of functional materials for heterogeneous and electro-catalysts in food production, pollution control, energy conversion and storage, medical applications requiring biocompatibility, drug delivery, and more. This book provides an interdisciplinary view that lies at the intersection of these fields. Presents fundamental knowledge of interfacial chemistry, surface science and electrochemistry and provides cutting-edge research from academics and practitioners across various fields and global regions
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1990
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Science categories.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1990
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Physics categories.
Fusion Technology
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Author :
language : en
Publisher:
Release Date : 1991
Fusion Technology written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Fusion reactors categories.
Erosion And Redeposition Experiments In The Pisces Facility
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Author :
language : en
Publisher:
Release Date : 1986
Erosion And Redeposition Experiments In The Pisces Facility written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
The modification of surfaces during exposure to plasma bombardment is a critical issue in the development of limiter and wall materials for fusion confinement experiments. Controlled studies of the erosion and redeposition of materials during high flux and fluence plasma exposure are now possible in the PISCES facility. PISCES is a continuously operating plasma device which has achieved hydrogen plasma densities of over 1013 cm−3 and electron temperatures of 5 to 24 eV over large areas. Ion fluxes of 1017 to 1019 cm−2 sec−1 and fluences of up to 1023 cm−2 have been used to bombard biased samples inserted into the plasma. The plasma parameters can be selected to produce simple sputtering, or redeposition by the ionization and recycling of the sputtered target materials. Collaborative studies on the performance of Cu and Cu-Li alloys (with ANL), stainless steel (with SNLL), and graphite (with IPP at Garching, and SNLL) have been undertaken. Surface topography modification is always observed after a sufficient fluence is achieved. The net erosion rate is significantly lower during redeposition than one would expect from classical sputtering yields. The transport and deposition of different materials by the plasma to the samples during redeposition conditions results in greatly modified surface composition and morphology. Chemical sputtering of graphite during low energy, high flux (>1018 cm−2 sec−1) plasma bombardment is observed. Chemically formed hydrocarbons are relatively easily redeposited compared to sputtered carbon. The performance of these materials, the surface morphology evolution, and the characteristics of the redeposited materials are discussed.
Government Reports Annual Index
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Author :
language : en
Publisher:
Release Date : 199?
Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 199? with categories.
Pisces Program Plasma Surface Interactions Research
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Author :
language : en
Publisher:
Release Date : 1989
Pisces Program Plasma Surface Interactions Research written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
This paper discusses the following about the Pisces program: Major objectives of the program; Staff in the PISCES program at UCLA; Highlights in the program; Collaborations with other institutions; PISCES-A facility; PISCES-B facility; Fast scanning Langmuir probe; Omegatron mass spectrometer; Spectroscopic diagnostics; Data acquisition system; Redeposition effect on carbon chemical erosion; Erosion of carbon tokamakium from TFTR; Effect of boron-doping on carbon chemical erosion; Radiation enhanced sublimation of carbon; Surface analysis of TEXTOR titles; Spectroscopic analysis of carbon impurities; Biased limiter and divertor; Biased divertor channel; Gaseous divertor experiments; Presheath profile measurements; Particle transport in CCT tokamak; and Biased divertor experiments in CCT.
Pisces Program
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Author :
language : en
Publisher:
Release Date : 1992
Pisces Program written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
This program investigates and characterizes the behavior of materials under plasma bombordment, in divertor regions. The PISCES facility is used to study divertor and plasma edge management concepts (in particular gas target divertors), as well as edge plasma turbulence and transport. The plasma source consists of a hot LaB[sub 6] cathode with an annular, water-cooled anode and attached drift tube. This cross sectional area of the plasma can be adjusted between 3 and 10 cm. A fast scanning diagnostic probe system was used for mapping plasma density profiles during biased limiter and divertor simulation experiments. Some experimental data are given on: (1) materials and surface physics, (2) edge plasma physics, and (3) a theoretical analysis of edge plasma modelling.