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XP812 & 820 Summary

XP812 & 820 Summary. S.M. Kaye 4/10/08 T&T TSG Meeting. XP812: Study the Effect of Rotation on Confinement. Joule milestone related Use n=3 braking to slow plasma down, preferably to a new steady-state Assess energy confinement/transport at different rotation

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XP812 & 820 Summary

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  1. XP812 & 820 Summary S.M. Kaye 4/10/08 T&T TSG Meeting

  2. XP812: Study the Effect of Rotation on Confinement • Joule milestone related • Use n=3 braking to slow plasma down, preferably to a new steady-state • Assess energy confinement/transport at different rotation • Couple to Neon injection for impurity transport if ready (it was not) • Results (1.5 day ops) • Discharge reproducibility was wanting, and no steady-state was achieved (discharge terminated due to MHD first) • Fine rotation control elusive (all or nearly nothing) • Resonant coupling of applied field to n=1 mode • Some discharges that can be analyzed • At this point, no further XP time necessary • Reassess after introduction of Lithium

  3. Reduced Energy Is Observed At Lower Rotation, But…

  4. XP809 (ELM destabilization) produced a discharge that can be used for multiples studies- Effect of rotation on confinement- Momentum transport in the outer region

  5. XP820: Core Momentum Transport • Joule milestone related • Use beam blips to change plasma rotation in core for various Ip, BT • Determine perturbative cf, vpinch if v, v decoupled • Results (1 day ops) • Discharge reproducibility again was wanting (occasional MHD early, and often late) • Blips did not effect rotation, needed to go to steps • Obtained data over some Ip and BT range • 0.7 – 1.1 MA @ 4.5 kG, 0.4 – 5.5 kG @ 0.9 MA • Preliminary look indicates cf & vpinch determination possible • Some additional data obtained from XP822 (Stutman) • At this point, no further XP time necessary • Need to work on data obtained • Reassess after introduction of Lithium

  6. “Subtle” Change in Rotation when BT Varied at Constand Ip Core rotation seems not to depend on BT, but Te, Ti do - Need to perform perturbation analysis with change of torque BT = 0.40 T BT = 0.45 T BT = 0.55 T

  7. Focus analysis on beam step-up time Step-down time may be “polluted” by MHD effects

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