[en] Several projects carried out recently were described illustrating the large scale calculation of data relevant to neutral beam heating/diagnostics in fusion experiments. For example, work to produce state-selective charge transfer data for CXRS involving Ar were described. First treated comprehensively in the 1990’s data were computed for Ar"1"5"-"1"8"+ + H(1s), tabulating the n- and nl-resolved charge transfer cross sections for several energies relevant to neutral beam diagnostics at the time. The data were disseminated via the website of the ORNL Controlled Fusion Atomic data Center]. With an eye to ITER relevant neutral beam energies, this database was extended about ten years later to include higher impact energies, and also excited state H targets (H(2s), H(2p)).

[en] Atomic and molecular processes in plasmas play a crucial role in the development of net energy producing magnetic fusion devices. In light of this fact, presented here is a survey of the broad needs of fusion energy research and a review of the status of the existing database. Emphasis is placed on the relatively new needs for data as novel materials are evaluated for use in the next devices, and as components such as the divertor take on more significance for demonstration and practical reactors. Also, examples are given of recent or ongoing data evaluation efforts, the role of national and international data centers is discussed, and some summarizing comments are given

[en] This panel was charged with leading and stimulating discussion regarding two principal issues: (1) the need to increase the visibility of atomic data production and collection activities in recognition of their role as vitally important resources for diverse applications, and (2) the need to assure the open exchange of this data. Comments by the panelists, supplemented by interaction with the audience, are summarized here along with the principal conclusions

[en] Utilizing the classical trajectory Monte Carlo (CTMC) technique, the author has undertaken the first comprehensive study of antimatter-atom collisions in the intermediate velocity regime (1 to 7 a.u.). This work has elucidated the effects of varying projectile mass and sign of charge in the collisions of electrons, positrons, protons and antiprotons with helium and krypton. Using both a screened Coulomb potential and a newly implemented model potential approach he has calculated total and differential cross sections for single electron removal processes in these systems. By analysis of these cross sections and from a detailed examination of the individual CTMC trajectories, he has formulated a simple model of the collision dynamics which lead to the predicted, and observed, behavior of these collisions. For example, he has found that due to their smaller mass relative to protons, positrons may readily vector momentum match with an orbital electron, capturing it. Consequently, at large impact velocities, positrons are more likely to remove an electron by charge transfer than are equivelocity protons. Further, he has demonstrated that a resolution of the discrepancies which exist between the theoretical consensus and the existing experimental measurements of the positronium formation cross section can be accomplished by taking into account the lack of complete confinement of positrons scattered to large angles and the accompanying loss of positron flux

[en] Due to the present interest in modeling and diagnosing the edge and divertor plasma regions in magnetically confined fusion devices, we have sought to provide new calculations regarding the elastic, excitation, ionization, and charge transfer cross sections in collisions among relevant ions, neutrals, and isotopes in the low- to intermediate-energy regime. We summarize here some of our recent work

[en] A brief proceedings of the two-day Workshop on Molecule Assisted Recombination and Other Processes in Fusion Divertor Plasmas, organized by the ORNL Controlled Fusion Atomic Data Center on September 8-9, 2000, is presented. The conclusions and recommendations of the workshop regarding the topics discussed and the collaboration of the U.S. fusion research and atomic physics communities are also summarized

[en] Charge transfer is an important process in many astrophysical and atmospheric environments. While numerous experimental and theoretical studies exist for H and He targets, data on other targets, particularly metals and molecules, are sparse. Using a variety of theoretical methods and computational techniques the authors are developing methods to estimate the cross sections for electron capture (charge transfer) in slow collisions of low charge state ions with heavy (Mg, Ca, Fe, Co, Ni and Zn) neutrals. In this ongoing work particular attention is paid to ascertaining the importance of double electron capture

[en] Recent calculations and measurements have revealed unexpected oscillations of the total cross section for excitation in low- to intermediate-energy He²⁺ + H collisions. A physical explanation of this behavior is given here stemming from analysis of classical trajectory Monte Carlo simulations, molecular orbital close coupling calculations, and solution of the time-dependent Schroedinger equation on a numerical lattice. These results indicate that the observed behavior should be characteristic of a wide range of reactions in ion-atom collisions

[en] This report contains the following discussions on a time-dependent description of electron-atom/ion collisions: numerical calculation of correlated wavefunctions for the coulomb three-body problem; the basis-spline collocation method; and time-dependent perturbation theory model

[en] The Controlled Fusion Atomic Data Center (CFADC) was founded by C.F. Barnett at ORNL in 1959. Its mission is to identify, compile, evaluate and recommend data on atomic and molecular collision processes which are important in fusion energy research. The principal ongoing activities of the CFADC are threefold: Literature searches and maintenance of on-line databases of bibliographic references and numerical collision data, compilation, evaluation and recommendation of atomic and molecular collision data for fusion applications, participation in the International Atomic and Molecular Data Center Network, which facilitates the co-ordination of activities, exchange of data, identification of data needs and assessment of the existing database