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2-pt model (sort of) used to estimate n e sep

2-pt model (sort of) used to estimate n e sep. Start with projected heat flux Assume Te div sep For now I use T e = const in divertor, could also assume a ratio of separatrix to far SOL values T e div is scanned over a range (10-100 eV)

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2-pt model (sort of) used to estimate n e sep

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  1. 2-pt model (sort of) used to estimate nesep • Start with projected heat flux • Assume Tedivsep • For now I use Te=const in divertor, could also assume a ratio of separatrix to far SOL values • Tediv is scanned over a range (10-100 eV) • Use 2-pt model (see Jaworski slides from meeting #6) to get upstream Te, ne • I really use ½ this value->fudge factor based on measured ne at Te=Te2pt, and Mike’s OEDGE modeling • Further assume that line-average density is 3*nesep • Use divertor profiles of flux, ne, Te as usual to get plenum pressure as Tediv (and hence nesep) is varied

  2. Pressure vs. density, 1MA • ng~1x1020 m-3, q=9mm • To pump beams, need P~0.8 mTorr (or maybe really ~0.55 mTorr, according to Stefan and TRANSP) • If you believe this, you can run with ROSP close to the pump (might require SFD) to get fG down to ~0.3, or run at more normal ROSP and puff to get to fG ~ 1.0 To pump beam input

  3. A bunch of currents… • This time Rpump 0.72

  4. A bunch of currents… • This time Rpump 0.72

  5. A bunch of currents… • This time Rpump 0.72

  6. Greenwald fraction vs. Ip and pump location

  7. Greenwald fraction vs. Ip and ROSP

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