Abstract
We developed and applied models for overall (atom + ion) sputtering and sputtered Li+ transport of liquid lithium tokamak divertor surfaces. The model/analysis has four parts: (1) a temperature-dependent data-calibrated empirical/code (TRIM) model of lithium sputtering by D+ and Li + as a function of incident particle energy and angle; (2) temperature and energy-dependent molecular dynamics (MolDyn) modeling using an effective interionic pair potential of surface-reflected redeposited Li +; (3) analytical model of reflected lithium charge state; and (4) analytic model of Li+ near-surface emission/redeposition cascade. We predict: (1) strong temperature dependence of sputter yields, (2) reflection coefficients of order 50% (thermal energies) and 10% (hyperthermal energies), (3) reflected lithium charge fractions of 10-30% near 1 eV incidence, and (4) enhanced but non-runaway Li emission for the studied surface temperature range between 473 and 653 K.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 94-98 |
| Number of pages | 5 |
| Journal | Journal of Nuclear Materials |
| Volume | 337-339 |
| Issue number | 1-3 SPEC. ISS. |
| DOIs | |
| State | Published - Mar 1 2005 |
| Externally published | Yes |
Keywords
- Liquid lithium
- Low-energy reflection
- Molecular dynamics
- Sputtering
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- General Materials Science
- Nuclear Energy and Engineering