R. Neu

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E1/E2 meeting on Intrinsic impurity transport
modelling versus experiment
R. Neu E1/E2 Meeting, 7/4/11
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Introduction

• Manning
• Intrinsic impurity transport modelling versus
  experiment
• R. Neu
• Introduction and plans
• 13.30 E. Fable
• Turbulent impurity transport in the core of
  tokamaks, physical mecha-nisms, ongoing
  validation efforts, potential impact on plasma
  discharges
• 14.05 R. Dux
• Impurity transport in the ETB of AUG H-Mode
  discharges
• 14.40 Coffee
• 14.55 M. Valisa
• Achievements and open issues in impurity profile
  control at JET
• 15.30 C. Giroud
• Impurity transport characterisation in JET
  operational scenarios

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Manning Issues

• Preliminary Results from the Manning Selection
• good coverage (personnel, dates) of competencies
• SC selection close to being finalised
• Detailed analysis for identification of gaps and
  shortages ongoing
• TSL selection had to be restricted to 12
  candidates due to available number of slots (min.
  stay 60 days)
• Next steps in the manning selection
• TFL/(CSU) meetings on the 8th, 11th and 12th of
  April to finalise
• Allocated time for parastic experiments in
  restart (interaction TFL/CSU/POG)

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Restart integration
Red NO parasitic experiments
Yellow monitoring experiment ONLY
White Parasitic experiment with possibility of
pulse time.
Restart 1
W31
PPCC PPCC PPCC PDV PDF PPCC PTN WALLS PTN WALL PPCC PDV PDF PPCC PPCC

Parasitic Experiments to be filled
This phase should try to put in place the
conditionning/breakdown diagnostic tools
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Impurity Transport

• One of main ILW goals
• Demonstrate/investigate feasibilty of W
  divertor operation in baseline and advanced
  scenarios
• Dedicated experiments as well as long term
  monitoring envisaged
• Two extremes could hamper investigations
• - strong negative impact of central W radiation
• ? change of experiment strategy could be
  necessary
• - no measurable influence of W
• ? loss of interest by non experts, design of
  dedicated discharges
• Supporting investigations on intrinsic impurities
  by injection of tracers
• (LBO, gas puffs)

8
Dedicated sessions for impurity transport
investigations
Category 1

• Ex-2.2.1 Determination and control of the
  intrinsic impurity composition in the full W
  divertor (4 sessions)
• Ex-2.2.2 W screening, peaking and control (5
  sessions)
• Ex-3.2.5 Effect of SOL transport, pedestal and
  ELMs on impurity transport (C30)

Category 2

• Ex-2.1.6 Characterisation of ICRF heating with
  the ILW
• Ex-2.2.4 Impurity seeding in preparation for ITER
  
• Ex-1.1.7 Divertor W erosion and ELM induced
  sputtering
• Ex-1.1.8 Long term evolution of W erosion and
  migration

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Parasitic experiments for impurity transport
investigations
Parasitic

• Px-2.1.3 Control of impurities accumulation
  during current rise in diverted plasmas