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Title 289: Demonstrate access to beta_N=5 with min(q)>2
Name:Timothy Luce tim.luce@iter.org Affiliation:ITER Organization
Research Area:Steady State Heating and Current Drive Presentation time: Not requested
Co-Author(s): ITPA Joint Experiment : No
Description: The motivation for going to min(q)>2 in steady-state scenario development is the prediction of access to high beta_N (>5) due to wall stabilization when li is very low. This key assumption has yet to be observed experimentally. As a proof of principle, use a B ramp to q95 between 3.5 and 4 to make the current profiles needed for the demonstration. Try to limit the end value of B to be >1.3 T to allow MSE measurements for stability analysis of reconstructed equilibria. But, do what is needed to get to beta_N>5. Propose unpumped double-null to maximize the beta_N limit and confinement, and minimize li. If successful, reduce current to give q95~4-4.5, then 5-5.5 to see if high beta_N is still possible. ITER IO Urgent Research Task : No
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