2 edition of Hydrogen isotope trapping in materials exposed in PLT found in the catalog.
Hydrogen isotope trapping in materials exposed in PLT
Princeton University. Plasma Physics Laboratory
Published
1979
by Dept. of Energy, Plasma Physics Laboratory, for sale by the National Technical Information Service] in Princeton, N.J, [Springfield, Va
.
Written in English
Edition Notes
| Statement | by W. R. Wampler ... [et al.] |
| Series | PPPL ; 1537 |
| Contributions | Wampler, W. R, United States. Dept. of Energy, Topical Meeting on Fusion Reactor Materials, Miami Beach, Fla., 1979 |
| The Physical Object | |
|---|---|
| Pagination | 5 p. : |
| ID Numbers | |
| Open Library | OL14882530M |
Detailed studies were performed in WP PFC to experimentally determine the retention mechanisms, the isotope exchange, the surface release mechanisms as well as to develop corresponding complex models for these processes in bare plasma-facing materials and co-deposits [40, 41]. However, in a real fusion-reactor environment, implantation of Cited by: If tungsten is to be used as a plasma-facing material in a fusion reactor, it is necessary to know its hydrogen isotope recycling and retention characteristics. The Tritium Plasma Experiment (TPE) has been used in a research program to determine the retention of tritium in % pure tungsten exposed to high fluxes of eV by: 1.
@article{osti_, title = {Hydrogen diffusion and trapping in bcc and fcc metals}, author = {Richter, D}, abstractNote = {The fundamental aspects of the metal--hydrogen systems are described. The large number of anomalous properties are the reason for continuous scientific effort. The time scale of hydrogen motion is extremely : D. Richter. The three most stable isotopes of hydrogen: protium (A = 1), deuterium (A = 2), and tritium (A = 3). Hydrogen is the only element whose isotopes have different names in common use today: the 2 H (or hydrogen-2) isotope is deuterium [4] and the 3 H (or hydrogen-3) isotope is tritium. [5]Standard atomic weight A(H): [, ], Conventional:
Hydrogen isotope trapping and retention in graphite and boron carbide under consecutive irradiation by deuterium and hydrogen plasma Article Full-text available. the use of the hydrogen isotopes deuterium and tritium deuterium trapping and release in carbon materials .. 55 A. Pisarev, A. Rusinov, N. Trifonov, Yu. Gasparian Review of erosion/deposition and retention of hydrogen isotopes (H, d, t) sub-surface layers of the materials that are exposed to.
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/ Hywogen isotope trapping in materials exposed m PLT 5. EVALUATION OF TEMPERATURES AND FLUENCES Model To relate the measured H,D depth profiles and concentrations to plasma parameters It is necessary to have data on the trapping of H,D ions in Si and C as a function of energy, {luence and angle of inci- by: Get this from a library.
Hydrogen isotope trapping in materials exposed in PLT. [W R Wampler; Princeton University. Plasma Physics Laboratory.; United States. Department of Energy.]. Comparisons of the measured H,D concentrations and depth profiles with laboratory implantations and calculated depth profiles give the energy and fluence of the hydrogen implanted in the PLT samples.
For a Maxwellian distribution, characteristic temperatures of to eV due to plasma charge exchange, and 50 to eV due to ions at the plasma edge are obtained. Hydrogen Isotope Permeation and Trapping in Additively Manufactured Stainless Steel Richard Karnesky, Paul Chao, Dean Buchenauer Sandia National Laboratories, Livermore CA Tritium Focus Group, PNNL May •Customers •How and why AM •Permeation process, capabilities •Examples of diatomic gas-driven permeation inAM steel •Trapping •Summary.
As PFMs, W materials will be exposed to the high fluxes of deuterium (D) and tritium (T) particles under irradiation of 14 MeV neutrons (n). Defects created by n-irradiation act as traps for hydrogen (H) isotopes, and hence the T inventory in n-irradiated W materials is an important issue when assessing the safety of fusion by: ≥ oC (“stage V” in recovery stages of irradiated W), annealing of defect clusters takes place.
= oC (ca. eV) corresponds to hydrogen isotopes chemically-adsorbed on inner surfaces of vacancy clusters. It is plausible that defects playing dominant roles in trapping at high temp.
Deuterium is a good model for hydrogen interaction in the material, having the same solubility and trapping and a diffusivity, D, that is known to scale as D D = D H m H m D, where m is the mass of the respective isotope and the subscripts D and H refer to deuterium and hydrogen, by: 3.
Hydrogen Isotopes in Metals) MACROSCOPIC RATE EQUATION: MODEL DESCRIPTION “Macroscopic rate equation modeling of trapping/detrapping of hydrogen isotopes in tungsten materials”, E Hodille et al, submitted to JNM, “Macroscopic rate equation modeling of trapping/detrapping of hydrogen.
In addition, the Hydrogen Isotope Diffusion and Trapping (HIDT) simulation code was applied to represent the present experimental results and evaluate the trapping energies for various trapping sites in W produced by Fe ion irradiation, and the depth profile of D.
In this study, damages introduced by MeV iron ion irradiation are regarded as surface damage, and by 6 MeV iron ion irradiation are Author: Moeko Nakata, Keisuke Azuma, Akihiro Togari, Qilai Zhou, Mingzhong Zhao, Takeshi Toyama, Yuji Hatano. Journal of Nuclear Materials & () HYDROGEN TRAPPING, DIFFUSION AND RECOMBINATION IN AUSTENITIC STAINLESS STEELS Robert A.
LANGLEY Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge, TennesseeUSA Keywords: trapping, diffusion, recombination, stainless steel Trapping, diffusion, and recombination of hydrogen in austenitic Cited by: The trapping mechanisms for hydrogen isotopes in Al-X Cu ( at.% Constant heating rate TDS was used to determine microstructural trap energies and occupancies.
Recent data on deuterium retention in carbon fibre composites and tungsten both irradiated with D ions and exposed to D plasmas are presented. Deuterium depth profiles measured up to depths of 7–14 μm allow understanding of the mechanism which is responsible for the hydrogen isotope trapping in these materials.
Models and Data for Plasma-Material Interaction in Fusion Devices Book of Abstracts Contents Multiple hydrogen trapping by vacancies: Its impact on defect dynamics and hydrogen retention in Macroscopic rate equations modelling of trapping/retrapping of hydrogen isotopes in W materials.
Hydrogen isotope trapping in materials exposed in PLT*1. the amount and depth distribution of implanted hydrogen isotopes and higher Z impurities. Max Planck Institute for Plasma Physics. @article{osti_, title = {A thermal desorption spectroscopy study of hydrogen trapping in polycrystalline α-uranium}, author = {Lillard, R.
and Forsyth, R. T.}, abstractNote = {The kinetics of hydrogen desorption from polycrystalline α-uranium (α-U) was examined using thermal desorption spectroscopy (TDS).
The goal was to identify the major trap sites for hydrogen and their. rate equation modeling of trapping/detrapping of hydrogen isotopes in tungsten materials. Journal of Nuclear Materials, Elsevier,theme issue "Models and Data for Plasma-Material Interaction in Fusion Devices", (1), pp HAL Id: hal On the right-hand side of equation, the first term defines the increase in concentration of trapped hydrogen isotopes as being proportional to the fraction of bulk interstitial sites containing a diffusing hydrogen isotope (c m /n m) and to the concentration of empty trapping sites (n t − c Cited by: Desorption phase of thermal desorption spectroscopy (TDS) experiments performed on tungsten samples exposed to flux of hydrogen isotopes in fusion relevant conditions is analyzed using a reaction-diffusion model describing hydrogen retention in material bulk.
Two regimes of hydrogen desorption are identified depending on whether hydrogen trapping rate is faster than hydrogen diffusion rate in material during. The D trapping behavior was evaluated using Hydrogen Isotope Diffusion and Trapping (HIDT) code. It was found that D trapping states consisted of two-four stages with the trapping energy of eV, eV, eV and eV depending on the damage concentration and by: 3.
Macroscopic rate equation modeling of trapping/detrapping of hydrogen isotopes in tungsten materials Article in Journal of Nuclear Materials June with 78 Reads How we measure 'reads'. Introduction to Isotope Hydrology: Stable and Radioactive Isotopes of Hydrogen, Carbon, and Oxygen - CRC Press Book The application of natural isotopes, stable as well as radioactive, has become a widespread tool for hydrological research, especially surface- and.
Tritium retention in plasma-facing materials impacts the design and operation of tritium-fuelled fusion devices such as ITER [1, 2].Tungsten is under consideration for use in the ITER divertor, and has been successfully tested as a plasma-facing material in ASDEX Upgrade [].Retention of hydrogen isotopes in tungsten from exposure to plasma has been observed to be mainly near the Cited by: A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.
