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TF1: Physics integration for high performance RFP Proposals and discussion

TF1: Physics integration for high performance RFP Proposals and discussion. T. Bolzonella, A. Canton, M. Zuin. Motivation: RFX original targets. From Sergio Ortolani’s office. Motivation. Motivation. Task Force 1. “Physics integration for high performance RFP”. Task Force 1.

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TF1: Physics integration for high performance RFP Proposals and discussion

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  1. TF1: Physics integration for high performance RFPProposals and discussion T. Bolzonella, A. Canton, M. Zuin T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  2. Motivation: RFX original targets From Sergio Ortolani’s office T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  3. Motivation T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  4. Motivation T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  5. Task Force 1 “Physics integration for high performance RFP” T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  6. Task Force 1 “Physics integration for high performance RFP” ? T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  7. A few preliminary comments • Physics integration: • We want to reach all the parameters listed as RFX targets and then integrate them in the same discharge • To reach this final target we also need to integrate advanced knowledge in different physics areas: wall conditioning and plasma fuelling, edge and core transport, axisymmetric and MHD control (TF2), ... • High performance • What is plasma performance? • Plasma performance is quantitatively described by few parameters: bq ,tE (tE,e+ tE,i?), n. we should refer to them... • Note: good confinement is often a necessary but not sufficient condition to get high performance plasmas! • RFP • Of course RFP configuration is our target, but can we improve RFP confinement and performances by operating in other configurations like ULq and tokmak? T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  8. Main areas covered by proposals • Wall conditioning techniques + analysis (LLL, GDC, boronization) 13% • Effects of different particle fuelling techniques 6% • High density 6% • Transport (impurities, cold pulse, LBO) 7% • SHAx triggering (by pellet, by NBI, by n=6,...) 6% T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  9. Main areas covered by proposals • Internal B field meas. by pellets, polarimetry, MSE 9% • Advanced operations (OPCD, OFCD, SSCD+PPCD) 6% • Scalings (dynamo, DRE, turbulence, barrier, very deep and very shallow F, ...) 23% • Low current (m=0, j_parallel, self rotation, ...) 9% • Only a few “operational”: slow ramp-up, He, ... T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  10. Total of approximately 53 proposals submitted to TF1, very comprehensive approach to “physics integration”. Some of them requiring many experimental days. Interestingly enough, a consistent part of experiments channelled through TF1 requires medium-low Ip. Remember: 37 operational weeks of commissioning + plasma T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  11. Is it all we need? T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  12. RFP community integration - 1 m=0 Total fluctuation n≠0 m=1 ULq m=2 F parameter and magnetic fluctuations RELAX, R. Ikezoe et al., PPCF, 2011 RFX-mod, M. Zuin T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  13. RFP community integration - 2 SHAx states RFX-mod team MST team T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  14. RFP community integration - 3 Scalings F. Auriemma T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  15. Activity Program 2011 - 1 We do have an official document on scientific priorities: the 2011 Activity Program • RFX-mod and RFP physics fusion science programme for 2011 has two main goals: • Goal #1:Answer the question: “Is the RFP a viable fusion reactor concept?”. • Goal #2:Strengthen the role of RFX as a multi-tool facility for advancement of magnetic fusion science and technology. • These goals should be implemented through four projects • Each project can be based on several tasks T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  16. Activity Program 2011 - 2 • Project 1: exploration and understanding of RFX-mod performance at plasma current above 1.5 MA • Task #1:Density and first wall control • Task #2: Scenario development • Task #3: Physics understanding: data analysis and modeling • Project 2: advancing feedback control of MHD stability in fusion devices • Project 3: fusion physics in a three-dimensional configuration • Project 4: goals and directions for potential upgrades of the RFX experimental facility • Task #1:Analysis of confinement and main plasma parameter scaling laws, based on present experimental data • Task #2:Exploration of feasible upgrades to the present RFX-mod device • Task #3:Concept studies for major RFX-mod upgrades T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  17. The role of TF1 and TFL • Share information on program priorities • Optimize the use of experimental time • Machine time is an extremely precious resource! (remember also Elena’s talk) • Many people work (often on shifts) before/during/after the experimental time. Their work deserve the best respect. • Improve the detail of proposals. Done! • Preparation of the experiments: analysis of existing data, experimental plan, shot preparation, analysis tools. • Note that the last point needs to know the experimental schedule in advance! Will this be the hardest challenge of 2011? • Help, when possible, data analysis and shared publications T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  18. Commitments for 2011 • Assess the effect of wall conditioning on ETB and ITB formation • Assess the effect of F parameter on the maximum density reachable at a given plasma current, if any. • Build an integrated view on different helical quantities: MHD equilibrium, magnetic boundary, temperature, density, flow, ... • Contribute to RFX-mod (and, in general, RFP) scaling database • Advance the experimental knowledge on dynamo mechanism in MH, DHAx, SHAx regimes: can we tame DRE? • Assess the role of m=0 (and m=2?) in RFX-mod magnetic dynamics T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  19. What is missing? T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

  20. He plasmas are OK, even if not too many proposals. How about D plasmas in RFX-mod? Would it be possible in 2011? • Similarity experiments? (standard discharges, MST-like PPCD, others,...) • Experiments aiming at clarifying future directions for RFX and RFPs in general • Provocative question: is SHAx the RFP state with the best plasma performances? In MST it is not (yet)... • Probably much more... T. Bolzonella – 9 February 2011 – RFX-mod programme workshop

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