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Steady-state snowflake divertor configurations were developed and characterized in XP 1045

Steady-state snowflake divertor configurations were developed and characterized in XP 1045. Magnetic configuration development in FY2010 T wo -coil SFD configuration with PCS SP control in medium- d discharges Much improved control of SPs and SFD, but periods of SFD for 100-200 ms

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Steady-state snowflake divertor configurations were developed and characterized in XP 1045

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  1. Steady-state snowflake divertor configurations were developed and characterized in XP 1045 • Magnetic configuration development in FY2010 • Two-coil SFD configuration with PCS SP control in medium-d discharges • Much improved control of SPs and SFD, but periods of SFD for 100-200 ms • SFD with three coils (w/ reversed PF1B) from a medium-ddischarge • Steady-state SFD, however, all shots were ELMy, despite Ip=0.8-1 MA, Pin=3-6 MW • SFD with three coils (w/ reversed PF1B) from a from a high-d discharge • Best steady-state SFD, no OSP sweeping through CHI gap • Fiducial like-performance, basis for integration with advanced scenarios • Developing X-divertor with reversed PF1B and high X-point • Characterization • Confirmed partial detachment of OSP • Confirmed heat flux reduction in SFD • Could not confirm impurity reduction due to ELMs

  2. Snowflake divertor configuration nearly eliminated steady-state heat load on divertor PFCs • Heat load due to ELMs remained

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