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JET DT fusion yield projections

JET DT fusion yield projections. Clive Challis with thanks to J Bizarro (JETTO runs) J Garcia (CRONOS runs) I Jenkins (TRANSP runs) F Crisanti, E Joffrin, X Litaudon, P Lomas, V Riccardo, T Todd, K-D Zastrow ISM Meeting (30 Nov 2010). Background. Objectives:

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JET DT fusion yield projections

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  1. JET DT fusion yield projections Clive Challis with thanks to J Bizarro (JETTO runs) J Garcia (CRONOS runs) I Jenkins (TRANSP runs) F Crisanti, E Joffrin, X Litaudon, P Lomas, V Riccardo, T Todd, K-D Zastrow ISM Meeting (30 Nov 2010)

  2. Background • Objectives: • to extrapolate ITER-relevant scenarios on JET to high performance DT • to identify routes to high steady Q on JET for DT physics studies • Boundary conditions: • EP2 beam upgrade (per NIB): • D : 16.1MW @ 124keV (Efull=52%:Ehalf=38%:Ethird=10%) • T : 17.4MW @ 118keV (Efull=63%:Ehalf=26%:Ethird=11%) • PINIs 1, 6 & 7 ‘Upshifted’ • B>3.45T and/or ITF2t>90x109A2s assumed (scarce resource) * Note: up to PT=18.7MW assumedin Science Meeting talk with (Efull=58%:Ehalf=29%:Ethird=13%) Note: duration of steady plasmamay depend on time to IPflat-top and PF coil limits

  3. ELMy H-mode extrapolation • ELMy H-mode recently developed at 3.8MA: • HIPB98(y,2)~1 • <ne>V~7x1019m-3 • Extrapolation to DT using TRANSP: • Increase IP & BT to 4.5MA/3.6T • 50:50 D:T plasma & beams (EP2 spec) • Ti & Te profiles scaled to maintain H98(no credit for mass scaling or -heating) • Pfusion~4-6MW • QDT,eq~0.20-0.25

  4. AT scenario extrapolation • Predictive simulation based on #64323: • IP/BT=2.3MA/3.5T • D plasma & beams (Zeff=3) • 3MW(LH), 32MW(NB), 10MW(ICRH) • Bohm/gyroBohm+ITB core transport • pedestal pressure chosen so that HIPB98(y,2)=1 with ITB model switched off • ne(r), Te(r), Ti(r), (r) & j(r) predicted • intermittent ITB at ~0.7 leading to: • HIPB98(y,2)~1.7 & N~2.8 • ITB sustainment is sensitive to PLH • Extrapolation to DT with profiles conserved (i.e. no credit for mass scaling or -heating) • At Zeff~2.2 corresponds to: • Pfusion,th~10MW, Pfusion~17MW, QDT,eq~0.38 Litaudon et al NF 2007

  5. AI (low q95 hybrid) extrapolation • TRANSP extrapolation conserving profiles • CRONOS Bohm/gyroBohm+ITB shows: • poor NBI deposition and Pfusion at high ne • peaked Ti at low ne enhances fusion yield H98~1.25 total  thermal  TRANSP v CRONOS

  6. The bottom line… • Q~0.25 / Pfusion~8MW should be achievable……if H98 approaching 1.0 at high current is compatible with ILW • Q~0.5 / Pfusion~16MW might be possible……if improved performance of hybrid plasmas can be extended to the advanced inductive domain at high plasma current and moderate density whilst maintaining compatibility with the ILW • Q~1 / Pfusion>20MW, although unlikely, is not ruled out……but would require further improvement in confinement (especially for ion heat) without loss of hybrid stability properties or detrimental impact of techniques required for ILW compatibility

  7. What else is needed? • ELMy H-mode extrapolation at moderate density • Is there a route to higher Pfusion for ELMy H-mode is stationary H~1 operation could be achieved at high IP & BT with moderate density (~5-6x1019m-3)? • Simulations to clarify potential effect of high torque on advanced inductive scenarios • Jeronimo Garcia is preparing a modification to CRONOS AI simulations assuming i to complete the predictions made on an extrapolation basis • Would it be valuable to investigate the potential for improved core confinement due to the huge torque capability of the NBI EP2 upgrade (e.g. using GLF23)?

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