Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10645127 | Journal of Nuclear Materials | 2011 | 4 Pages |
Abstract
An experiment aimed at benchmarking the ITER scrape-off layer (SOL) power width scaling in limited L-mode discharges has been conducted on DIII-D. Scans of the main scaling parameters were performed in an inner-wall-limited (IWL) magnetic configuration. Using the near-SOL density and temperature e-folding lengths, λn, λT, determined from reciprocating Langmuir probe measurements, SOL power flux density e-folding lengths, λq, are derived. A few lower single null (LSN) discharges were also run for comparison. The results are generally in agreement with the ITER design assumptions, finding that λn and λT are correlated (λTâ¼1.2λn) and both λn and λT are on average 2.1-2.5 times larger in IWL configurations than in LSN. In moderate elongation (κ â¼Â 1.4) IWL discharges, λq is largest and agrees with the assumed ITER scaling within the estimated uncertainty (a factor of â¼2). In IWL discharges λq measurements are consistent with the expectations of SOL power balance.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
D.L. Rudakov, J.A. Boedo, R.A. Pitts, G.L. Jackson, C.J. Lasnier, A.W. Leonard, R.A. Moyer, P.C. Stangeby, G.R. Tynan, J.G. Watkins,