INTRODUCTION

• Detachment of divertor proposed for ITER (Janeschitz 1995),
• Detached plasma conditions:
  • eV,
  • m^-3,
  • m^-3,
  • chemical reactions tightly coupled.

• DEGAS 2 needs:
  • Transport in short mfp regime,
    • Check against fluid neutral model.
  • Accurate atomic physics for low T,
    • Developed collisional radiative code CRAMD (Pigarov 1996),
    • Effective rates: S_ion, S_rec, S_dis, H.
    • Apply DEGAS 2 - CRAMD
      to Alcator C-Mod detached plasma.