Impurity enrichment and radiative enhancement using induced SOL flow in DIII-D
- Lawrence Livermore National Lab., CA (United States)
- General Atomics, San Diego, CA (United States)
- Oak Ridge National Lab., TN (United States); and others
Experiments on DIII-D have demonstrated the efficacy of using induced scrap-off-layer (SOL) flow to preferentially enrich impurities in the divertor plasma. This SOL floe is produced through simultaneous deuterium gas injection at the midplane and divertor exhaust. Using this SOL flow, an improvement in enrichment (defined as the ratio of impurity fraction in the divertor to that in the plasma core) has been observed for all impurities in trace-level experiments (i.e., impurity level is non-perturbative), with the degree of improvement increasing with impurity atomic number. In the case of argon, exhaust gas enrichment using modest SOL flow is as high as 17. Using this induced SOL flow technique and argon injection, radiative plasmas have been produced that combine high radiation losses (P{sub rad}/P{sub input} > 70%), low core fuel dilution (Z{sub eff} < 1.9), and good core confinement ({tau}{sub E} > 1.0 {tau}{sub E,ITER93H}).
- Research Organization:
- General Atomics, San Diego, CA (United States); Oak Ridge National Lab., TN (United States); Princeton Plasma Physics Lab., NJ (United States); Univ. of California, San Diego, CA (United States); Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114; AC05-96OR22464; AC02-76CH03073; FG03-95ER54294; W-7405-ENG-48
- OSTI ID:
- 656761
- Report Number(s):
- GA--A22874; CONF-980560--; ON: DE98006156
- Country of Publication:
- United States
- Language:
- English
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