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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

XP812 & 820 Summary

S.M. Kaye

4/10/08

T&T TSG Meeting

xp812 study the effect of rotation on confinement
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
slide4

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

slide5

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
subtle change in rotation when b t varied at constand i p
“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

slide7
Focus analysis on beam step-up time

Step-down time may be “polluted” by MHD effects