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Fluctuation assessment through FIReTIP, MIR and high-k scattering systems (UC Davis)

Fluctuation assessment through FIReTIP, MIR and high-k scattering systems (UC Davis). K.C. Lee , C. W. Domier and N.C. Luhmann, Jr., University of California at Davis H. K. Park, E. Mazzucato, D. Smith S. Kaye, and C. Phillips PPPL, Princeton University diagnostics FY09-13 Planning meeting

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Fluctuation assessment through FIReTIP, MIR and high-k scattering systems (UC Davis)

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  1. Fluctuationassessment throughFIReTIP, MIR and high-k scattering systems(UC Davis) K.C. Lee, C. W. Domier and N.C. Luhmann, Jr., University of California atDavis H. K. Park, E. Mazzucato, D. Smith S. Kaye, and C. Phillips PPPL, Princeton University diagnostics FY09-13 Planning meeting February 27, 2007

  2. Monitoring system for density fluctuations on NSTX (MHD, turbulence, RF driven, Li ex.) • Global monitoring system (FIReTIP) • FIReTIP system is capable of monitoring density turbulence, global MHD modes, EM/ES waves from HHFW and Li experiments (including ELMs, ITG, TAE) • 5~6 channels covers a half of the torus (entire flux space) • Current time resolution is limited by (~500 kHz) and the proposal for higher rate up to ~1MHz is on pending • Local monitoring with High-k scattering system • High-k scattering system is capable of monitoring an extremely low level density fluctuation (addressing TEM, ETG modes) • Mode converted ES waves and nth IBW through nonlinear interaction at the edge • Time resolution is also limited to ~700 kHz (Digitizer limit) *details for each topics; NSTX dragNdrop directories/ presented by H. Park Edge (Jan,31), MHD (Feb. 9), Wave (Feb. 13), T&T (Feb. 19)

  3. Geometry of FIReTIP and High-k scattering system Inboard ρ = 0.05 k┴ρe up to 0.7 Outboard ρ = 0.75 k┴ρe up to 0.4 • ne/ne < 0.01 • Ch4 is operating • Dk= a/2 ~1.0 cm-1 • kr >4 cm-1

  4. Modification of detection systems for HHFW driven fluctuations High-k scattering system FIReTIP system FIReTIP IF signal is at ~7 MHz Tapped up-shifted signals at 23 MHz will be mixed with the reference FIReTIP signals and outcome is signals centered at ~30MHz FIReTIP signals at ~30MHz will be mixed with RF reference signals ~30MHz • Five regular mixers at ~880 MHz • Output will be mixed with another five mixers with ~30MHz RF frequency

  5. Poloidal High-k measurement on NSTX ► Choice of probe beam source – CH3OH(119 μm) or CD3OD (185 μm) ► Power level ~ 1W, (Ps ~ λ2) ► kθ up to ~50 cm-1 ► Minimum impact on the port and in vessel work

  6. MIR system on NSTX 1-D 2-D ► Presented by E. Mazzucato at T&T meeting (Feb. 19) ► UC Davis collaborations provide optics and detector array Antenna array Elliptical Lens Planar Antenna Array Liquid Crystal (LC) Phase Shifter MM-wave Phased Array Antenna IF electronics detection module

  7. Gyrocenter shift by charge exchange reaction => major source of Er formation [2006 APS invited] Future diagnostic work Measurement/calculation of neutral profile on NSTX: Dα , Dβ , edge TS ? ► required spatial resolution ~ 2 mm. [K.C. Lee et al., RSI (2006)]

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