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Proposal for Scenario Modeling in ITER’s Non-Activation Phase

This proposal outlines a new task focused on scenario modeling for the non-activation phase of ITER, emphasizing the early operational period characterized by L- and H-mode discharges. It aims to define credible ITER scenarios, demonstrating the capability of achieving ELMing H-mode operations and assessing the adequacy of heating systems. Key objectives include providing equilibria and profile data for source modeling, benchmarking scenarios with experimental data, and developing preliminary simulations. Volunteers are sought to engage in this crucial phase of ITER's development.

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Proposal for Scenario Modeling in ITER’s Non-Activation Phase

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  1. IOS-JA10: Scenario modeling for non-activation phase: a proposal T. A. Casper ITER Organization, Route de Vinon sur Verdon, 13115 St Paul Lez Durance, France ITPA IOS meeting October 18 – 21, 2011 Kyoto, Japan

  2. ISO-JA10: Scenario modeling for non-activation phase • New task: define direction and seek volunteers • Change the name: Scenario modeling for low- and non-activation early operation of ITER • Need to include DD operation should this be more attractive than H or He • Dedicated to the “early” period of operation … defined as the first real operation with systems and diagnostics capable of L- and H-mode discharges • Objectives: Define a credible set of ITER scenarios • Demonstrate capability of achieving ELMing H-mode operation in H, D, and/or He suitable for ELM-mitigation studies • Determine adequacy of heating and current drive systems for scenarios needed to qualify ITER systems for DT operation • Provide equilibria and profile data for source modeling and evaluation • Benchmark simulated scenarios with experimental data • Plans for 2011-2012: • Specify characteristics of the scenarios, e.g. plasma species and heating systems • Develop a preliminary set of scenarios

  3. Preliminary simulations completed in 2010 with DD study recently done in 2011 … the “show something category” • H-scenario presented as part of the EU task yesterday – my 1stvolunteers • Series of CORSICA simulations in H and D were completed in 2009/10 mostly to get a first estimate of discharge duration that might be possible • H-plasmas using the same prescription and shapes as the baseline inductive DT operation • Simulated Ohmic, L-mode and H-mode • Used only analytic sources - change to Source models • Must be updated for changes to ITER walls and coils • Divertor/wall awareness • DD scenario development (presented ) • Provided estimate of tritium inventory resulting from DD fusion reactions • A first attempt at a credible scenario with electron only heating • Demonstrated simulated control Casper, T.A. et al, Nucl. Fus. 51 2011 (accepted)

  4. “Show some results” category: Hydrogen H-mode scenario – hits CS1,2 limit at 200s without the added Palpha heating

  5. DD L- and H-mode scenarios were also run • DD H-mode is not significantly different than the H H-mode … very small amount of produced alpha heating • L-mode (picture) without early heating • CS1 limit at end of current ramp • Forces hit limit a little later, 120s • Need to optimize L-mode ramp up

  6. Summary: need to define credible set early operations scenarios • Is it H, He, DD? All of the above?…. Develop scenarios to help decide • Credible L- and H-mode scenarios at 15MA that satisfy all constraints • Will have ECH, may have NBI (looking better now), what about ICH? • If we want ICH, need to make the case within the ITER design and cost constraints…coupling? • Set of “experiments” (e.g. scenarios) given the systems we expect to have … IO needs to help define this • What we really need • Volunteers accepted to help define this and do the simulations. • Experiments to benchmark simulations … maybe already have the data for ITER shape.

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