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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

TF1: Physics integration for high performance RFPProposals 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
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


Main areas covered by proposals
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 proposals1
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

Is it all we need? comprehensive approach to “physics integration”.

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


Rfp community integration 1
RFP community integration - 1 comprehensive approach to “physics integration”.

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


Rfp community integration 2
RFP community integration - 2 comprehensive approach to “physics integration”.

SHAx states

RFX-mod team

MST team

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


Rfp community integration 3
RFP community integration - 3 comprehensive approach to “physics integration”.

Scalings

F. Auriemma

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


Activity program 2011 1
Activity Program 2011 - 1 comprehensive approach to “physics integration”.

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


Activity program 2011 2
Activity Program 2011 - 2 comprehensive approach to “physics integration”.

  • 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
The role of TF1 and TFL comprehensive approach to “physics integration”.

  • 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


Commitments for 2011
Commitments for 2011 comprehensive approach to “physics integration”.

  • 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

What is missing? comprehensive approach to “physics integration”.

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...

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


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