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XP 508 - High k,d long pulse double null development

XP 508 - High k,d long pulse double null development. XP review By D. A. Gates March 2, 2005. Motivation. It is well established that strong shaping can be beneficial for plasma performance The modifications to PF1A allow the simultaneous achievement of high elongation and triangularity

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XP 508 - High k,d long pulse double null development

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  1. XP 508 - High k,d long pulse double null development XP review By D. A. Gates March 2, 2005

  2. Motivation • It is well established that strong shaping can be beneficial for plasma performance • The modifications to PF1A allow the simultaneous achievement of high elongation and triangularity • This XP will develop long pulse double null plasmas over a range of fields and currents • Optimize shaping evolution and minimize internal inductance • Optimize sustained b

  3. Background • Part of a series of XPs designed to look at extending plasma pulse length (while raising Ip and lowering Bf) • XP-014: Pulse length optimization experiments on NSTX • XP-220: Effect of Triangularity and Divertor Configuration on H-mode Access Conditions and Performance • XP-228: Long pulse high current plasmas at high triangularity • XP-421: Long pulse high current plasmas at high elongation • Calculations (Kessel, Menard) the PF1A modification should improve performance further

  4. Run Plan • Optimize early shape evolution (40 Shots) • Manually adjust currents during ramp-up • Attempt to become diverted at high k ASAP • Attempt early H-mode, if necessary bias towards single null during current ramp • Adjust beam timing to optimize transition • 4.5kGauss, 1MA at least 2 sources NBI at 90kV • Adjust current ramp rate to minimize volt-second consumption

  5. Run Plan (cont.) • Scan parameters to optimize performance (60 shots) • Beam power scan (2,2.5,3 sources for each field) • TF scan (3-4.5kGauss in 0.5kGauss steps) • Ip scan (800kA, 1.0MA, 1.2MA) • If necessary, re-optimize startup at each field • If additional run-time available, repeat with rtEFIT (contingent on improved vertical control at high k with rtEFIT)

  6. Ip, Bf scan table

  7. Requirements • Boronization and demonstrated H-mode access • Reliable NBI operation • TS, CHERS, MSE • Magnetics, EFIT

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