Report from A+M Data Centre, RRC “Kurchatov Institute” Yu.V.Martynenko 18th Meeting of the Atomic and Molecular Data Centers and ALADDIN Network Vienna, October 2005

The main activities on A+M DATA: 1. The new A+M Data generation. 2. Computer code for tokamak plasma processes 3. Data base. 3. Data base.

6 A**(nLm) + B = A**(nL’m) + B (1) A**(nLm) + C + = A**(nL’m) + C + (2) The hydrogen-like H **, (He + ) **, (Li ++ ) **, were considered as A**(nLm), where L mixing is really resonant. Adiabatic approximation. Interaction of high excited atoms with slow neutral atoms and ions. M.Chibisov

7 Cross section of the process A**(nLm) + B = A**(nL’m) + B (1) orbit area Total Calculated cross section Discrepancy between theory and experiment caused by external electric field

8 Probability of the process A**(nLm) + C + = A**(nL’m) + C + (2) as a function of the impact parameter . For n =26 and collision velocity v*n = 0.1 (v= 4*10 -3 a.u.) the total cross section  n = 5*10 -5 cm 2 ( 4 orders of magnitude larger than in previous works based on classical approach). Reason of large  n (large value of  n ) : - wave function interference. Corresponding electric field is only 0.1 –0.01 V/cm.

9 For cross sections (1) and (2) calculation the mutual expansions of Coulomb parabolic and spherical wave functions have been studied in detail. Coefficients of these expansions were calculated on the base of space properties of these Coulomb functions.

10 Subthreshold Sputtering at High Temperatures JETP Letters V.77, No.7, p.430, 2003, M. I. Guseva, V. M. Gureev, B. N. Kolbasov, S. N. Korshunov, Yu. V. Martynenko, V. B. Petrov, and B. I. Khripunov The sputtering of W at temperature of 1470 K during irradiation by 5-eV deuterium ions in a steady-state dense plasma is discovered, whereas the threshold for the sputtering of W by D + ions is 160–200 eV. The measured sputtering Yield is 1.5x10 -4 at/ions. Model of subthreshold sputtering The subthreshold sputtering at a high temperature is potential sputtering of adsorbed tungsten atoms that are interstitials atoms coming to the surface from the space between the grains.

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12 NEW RESULTS: Subthreshold Sputtering is material kind dependent Subthreshold Sputtering yield reduces with dose increase

13 HYDROGEN AFFECT ON METAL MECHANICAL PROPERTIES M.I. Guseva, S.N. Korshunov, Yu.V. Martynenko, I.D. Skorlupkin Creep of the metal loaded up to yield point initiated by hydrogen ion irradiation (15-keV Н 2 + ). The creep begins after a latent time of the irradiation. Hydrogen ion induced creep is a result of hydrogen accumulation on the grain boundaries. The model explains the temperature dependence of the effect and predicts effect increase with grain size decrease. Creep curves for steel under hydrogen ion irradiation at different temperatures, Tensile load 300 MPa

14 Dust 1.Safety threat ( contains toxic and radioactive materials, retained tritium ) 2.Source of plasma impurities ( in a tokamak edge plasma dust particles can move with high speed and traverse distances comparable to tokamak radii ) Dust particle energy balance. Particle thermal radiation

15 Normalized radiant emittance of graphite particles at temperatures 2773 °K (4), 2273 °K (3), 1273 °K (2) and 773 °K (1). Submicron particle thermal radiation Yu.V.Martynenko, L.I.Ognev,Thermal radiation of conducting nanoparticles, J.Tech. Phys. 2005, 11, p. 130 Thermal radiation of small conducting particles is lower than that given by Stefan- Boltzmann law at size below a critical size and drops with particle dimension decrease. The critical radius r c, at which black body radiation law fails, is expressed through a combination of temperature T and particle conductivity , thus r c = c(ћ/2  kT) 1/2. I r->0 ~ r 5

Simplified Universal Numerical Code for atomic kinetics (SUNC ) V.S. Lisitsa, D.A. Petrov, D.A. Shuvaev Calculation of the radiative losses and spectral line intensities (low precision); Wide range of ion charges Z and plasma parameters T e and N e are supported; Very fast calculations Spectra of any atom may be considered as consisted of two parts: Lower part (an individual); Upper part (hydrogen-like). A selfconsistent algorithm of calculation of populations of upper part with account for lower part is developed.

17 Code UNC purpose is to make the fast universal numerical code for the calculation of the radiative losses and the spectral line intensities in wide range of plasma parameters and ion charges. This code is the generalization of ADPAK code [ Post D.E., et al, Steady state radiative cooling rates for low density, high-temperature plasmas// Atomic Data And Nuclear Data Tables 20, 1977, pp ] to the arbitrary plasma parameters from corona up to Boltzman equilibrium. The structure of the code makes it possible to replace separate subroutines by more exact ones without making global changes of code

18 Project “Complex computer modeling of modern tokamak plasma processes“ The Project tasks 1. Join together the existing Russian codes for high temperature plasma in magnetic systems and their adaptation for a single basic. 2. Development of the new codes within the main object. Code for edge plasma. 3. Parallel coding. Access to Grid system.

19 Joint code for edge plasma Object – the most total account of the processes in SOl 1. Convective transport across magnetic field 2. Atomic kinetic and radiation losses 3. Plasma surface interaction consistent with edge plasma processes The code joints some already existing codes: -Plasma dynamic, convection transport (Shurygin / Pastukhov) -Universal Numerical Code for atomic kinetics (V.Lisitsa) -Material response on plasma affect (Martynenko, Moskovkin) (sputtered and reflected particles flows)

20 Code dispatcher Plasma dynamic code Material response on plasma affect Universal Numerical Code for atomic kinetics The work sequence: 1.Plasma dynamic code calculates ion and electron density, temperature, and velocity and pass these to code dispatcher 2.Dispatcher determines plasma flows to the surface and pass they to Material response on plasma affect code 3.Material response on plasma affect code calculates particles flows from the surface and renews the data for ion and electron density, temperature, and velocity and pass they to Universal Code for atomic kinetics 4.Universal Code for atomic kinetics calculates charge and energy level populations for all species and pass the to dispatcher 5. Dispatcher averages over charge and mass required for plasma dynamic code and pass data to plasma dynamic code plasma dynamic code repeats calculation with new data.

21 Existing Data Base A+M Data for fusion are stored in preprints, review papers. Web sites, ALLADIN included.

Conclusions The main activity - new data generation Data relevant to specific condition in fusion devices.