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Impact of a Mock-up Ferromagnetic TBM on Plasma Operations in C-Mod

Impact of a Mock-up Ferromagnetic TBM on Plasma Operations in C-Mod. J A Snipes, L Giancarli, A Loarte. ITER Organization, St Paul-lez-Durance, France. Helium Cooled Lithium-Lead Test Blanket Module. Mass of ferromagnetic steel = 1300 kg

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Impact of a Mock-up Ferromagnetic TBM on Plasma Operations in C-Mod

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  1. Impact of a Mock-up Ferromagnetic TBM on Plasma Operations in C-Mod J A Snipes, L Giancarli, A Loarte ITER Organization, St Paul-lez-Durance, France

  2. Helium Cooled Lithium-Lead Test Blanket Module Mass of ferromagnetic steel = 1300 kg Six TBMs to be installed with two in each horizontal port at  = 0° and ±40°

  3. TBM induced stray fields can: Affect the plasma breakdown Modify the plasma equilibrium Enhance magnetic braking of v Produce locked modes through increased 2/1 error field Possibly affect the H-mode threshold Reduce thermal confinement in H-mode and L-mode Increase energetic particle losses TBM Effects on Plasma Operations 30 G 60 G

  4. Motivation:ITER urgent need for final TBM design, may affect TBM size, proximity to plasma, & TBM correction coils Goals:Quantify effects of a mock-up ferromagnetic TBM on breakdown, equilibrium, plasma rotation, locked modes, H-mode threshold and confinement, and energetic particle losses in C-Mod as a function of collisionality to attempt to extrapolate the results to ITER conditions Plan of execution:Design, build, and install a retractable mock-up TBM coil in a horizontal port to provide an additional ~1% local TF ripple when close to the plasma. Measure TBM mock-up effects on plasma operation at low, intermediate, and high collisionality. Where the effects are largest, repeat experiments retracting the TBM to reduce local additional TF ripple by a factor of 2 and compare the effects on plasma operation. Determine TBM mock-up location where plasma effects are only just measurable. Perhaps, one week of dedicated run time would be required to get all of these results. If the effects are large, it may be difficult to piggy-back on other experiments. Proposed TBM Physics Experiments

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