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

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

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

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

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

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

T. Bolzonella – 9 February 2011 – RFX-mod programme workshop A few preliminary comments  Physics integration: o We want to reach all the parameters listed as RFX targets and then integrate them in the same discharge o 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 o What is plasma performance? o Plasma performance is quantitatively described by few parameters:  ,  E (  E,e +  E,i ?), n. we should refer to them... o Note: good confinement is often a necessary but not sufficient condition to get high performance plasmas!  RFP o 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 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 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 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 Is it all we need?

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

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

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

T. Bolzonella – 9 February 2011 – RFX-mod programme workshop 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 We do have an official document on scientific priorities: the 2011 Activity Program

T. Bolzonella – 9 February 2011 – RFX-mod programme workshop Activity Program  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 The role of TF1 and TFL  Share information on program priorities  Optimize the use of experimental time o Machine time is an extremely precious resource! (remember also Elena’s talk) o Many people work (often on shifts) before/during/after the experimental time. Their work deserve the best respect. o Improve the detail of proposals. Done! o Preparation of the experiments: analysis of existing data, experimental plan, shot preparation, analysis tools. o 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 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 What is missing?

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