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Physics Basis of FIRE Next Step Burning Plasma Experiment

Physics Basis of FIRE Next Step Burning Plasma Experiment. Charles Kessel Princeton Plasma Physics Laboratory U.S.-Japan Workshop on Fusion Power Plant Design, University of Tokyo March 29-31, 2001. http://fire.pppl.gov. Goals of the FIRE Study.

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Physics Basis of FIRE Next Step Burning Plasma Experiment

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  1. Physics Basis of FIRE Next Step Burning Plasma Experiment Charles Kessel Princeton Plasma Physics Laboratory U.S.-Japan Workshop on Fusion Power Plant Design, University of Tokyo March 29-31, 2001 http://fire.pppl.gov

  2. Goals of the FIRE Study Using the high field compact tokamak, produce burning plasmas with Q > 5-10 over pulse lengths > 2 current diffusion times, to study and resolve both standard and advanced tokamak burning plasma physics issues, for $1B

  3. FIRE Has Many Features Similar to ARIES Tokamaks

  4. FIRE Looks Like a Scale Model of ARIES-AT Nw = 3 MW/m2 Pfus = 12 MW/m3 Nw = 3.3 MW/m2 Pfus = 5.3 MW/m3

  5. FIRE Can Access Various Pulse Lengths by Varying BT

  6. FIRE’s Divertor Must Handle Attached(25 MW/m2) and Detached(5 MW/m2) Operation

  7. FIRE’s Divertor is Designed to Withstand Large Eddy Current and Halo Current Forces

  8. FIRE Must Handle Disruptions VDE Simulation with 3 MA/ms Current Quench

  9. Reference: ELMing H-mode B=10 T, Ip=6.5 MA, Q=5, t(pulse)=18.5 s High Field: ELMing H-mode B=12 T, Ip=7.7 MA, Q=10, t(pulse)=12 s AT Mode: Reverse Shear with fbs>50% B=8.5 T, Ip=5.0 MA, Q=5, t(pulse)=35 s Long Pulse DD: AT Mode and H-mode B=4 T, Ip=2.0 MA, Q=0, t(pulse)>200 s FIRE Has Several Operating Modes Based on Present Day Physics FIRE can study both burning AND long pulse plasma physics in the same device

  10. Progress Toward ARIES-like Plasmas Requires A Series of Steps 1) stabilize NTM’s 2) stabilize n=1 RWM 3) stabilize n>1 RWMs *each step with higher fbs **each step with more profile control

  11. FIRE is Examining Ways to Feedback Control RWM/Kink Modes

  12. FIRE Must Satisfy Present Day Physics Constraints

  13. FIRE Can Access Most of the Existing H-mode Database

  14. FIRE’s Performance With Projected Confinement

  15. FIRE Is Being Designed to Access Higher b AT Plasmas

  16. Plasma Response to Paux Modulation

  17. Plasma Response to Fueling Modulation

  18. Divertor Pumping Strongly Affects Plasma Burn

  19. TSC Simulation of FIRE Burning AT Discharge Ip=5 MA, Bt=8.5 T, bN=3.0, li(3)=0.4, n/nGr=0.7, H(y,2)=1.15, PLH=20 MW, PICRF=18 MW, n(0)/<n>=1.45

  20. TSC Simulation of FIRE Burning AT Discharge

  21. Power and particle handling in the divertor/SOL/first wall Stabilization of NTM’s Stabilization of RWM/Kink modes Large bootstrap fraction plasmas with external CD Control of current, n, and T profiles Develop methods to mitigate/avoid disruptions Demonstrate energetic particle effects are benign All in a plasma with significant alpha particle heating A Burning Device Like FIRE Must Validate Assumptions Made in Power Plant Studies Like ARIES

  22. What can the machine do? Q Pulse length T and n variations Heating/fueling/pumping/current drive What is the impact of physics uncertainties? Scaling of tE Scaling of Pth(L to H) NTM b-limit Density limit Particle confinement tp*/tE What is machine flexibility to examine physics issues? Burn control AE, energetic particles Sawteeth, other MHD AT profile interactions (p(r), j(r), c(r)) The FIRE Design is Evolving

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