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UCSD Program at NCSX

UCSD Program at NCSX. J. Boedo for The UCSD and NCSX Teams. Scanning Fast Probe. General Information: Rotatable shaft (adjust to pitch angle) 10 tips (1xIsat, 2xDP, 2xImach, 4xVf (Er, E  ) Measures: Te, Ne (~3 ms), Isat, 2xE r , 2x E   Mach #, V par ,  r , V r , etc)

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UCSD Program at NCSX

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  1. UCSD Program at NCSX J. Boedo for The UCSD and NCSX Teams J. Boedo, UCSD

  2. Scanning Fast Probe • General Information: • Rotatable shaft (adjust to pitch angle) • 10 tips (1xIsat, 2xDP, 2xImach, 4xVf (Er, E ) • Measures: Te, Ne (~3 ms), Isat, 2xEr, 2x EMach #, Vpar , r, Vr, etc) • Yet to be implemented (Fast Te) • Bandwidth ~ 4 MHz • DAQ Sampling 1MS/s • In/out time ~ 80 ms • Pedestal (-6 cm) penetration in lowish power plasmas (2 MW) • There is spare probe it PPPL! • Head and shaft from exiting probe • Needs new control system • Use existing electronics box • Can move some kepcos, ideally new ones J. Boedo, UCSD

  3. SFP: Fundamental Potential Contributions • NSTX Physics we can test: • NCSX has low flow-damping >> Mach probe • Can manipulate flows for flow-shear stabilization. Can vary ripple to study: • Effects of flow damping >> Mach Probe • Zonal flows should be similar or larger than equiv. tokamak >> Measure Reynolds Stress • Designed to eliminate resonant field perturbations >> Ne, Te Vp structures • Designed for good flux surfaces at vacuum, intermediate and high >>dito • High density operation • Lower plasma edge temperature >> Measure • Greenwald limit impervious? >> Look at intermittency • Design PFCs >> Determine SOL/edge profiles • DIII-D measurements during I-Coil experiments show: • Potential increases (electron loss?) • Shift in Isat (due to boundary being pushed or pulled) • Increase in Ne and Vr fluctuations (core density drops) • Te fluctuations drop! • High spatial resolution and dense measurements important when geometry counts! J. Boedo, UCSD

  4. Field Effects Require Fine Resolution • I-Coil experiments at DIII • Perturbation at edge is narrow • Fluctuations change J. Boedo, UCSD

  5. Swinging Arm Probe • Used in ASDEX and ALCATOR • Proposed for DIII-D • Very Compact, tucked in tiles • Measurement capabilities (# tips, # cables, complexity) depend on space • Can be placed in divertor or wall structures Smick et al, JNM 2005 J. Boedo, UCSD

  6. Limiter Probes/Calorimeters • Modular system (instrumented tile) w probes and calorimeters • Rooftop probes. Brazed contacts • Staggered design for high spatial resolution • Crucial for PFC design and Heat/particle load evaluation J. Boedo, UCSD

  7. Fast Bolometer/SXR array • Modular system, in vacuum • Sensitive to radiated power over wide energy range (1 eV - 10 keV) UV to SXR. Filter wheel..remote! • Fast time response (up to 2 MHz). • Can be filtered to look at different energy ranges • Multicolor system easy • Relatively inexpensive ~$25k! Fast total radiated power estimate during disruption 30 channels on DIII-D • Uses for NCSX: • Plasma position • Rough Te (breemstrahlung) • Rough impurity monitor • Plasma control? Shell inversion of emission during disruption (center post) Divertor ELM brightness J. Boedo, UCSD

  8. Fast Multi-Color Cameras • Re-entrant optics w/ periscope for tangential view OR Radial view • Tangential or radial view imaging whole plasma • Two or more cameras w beam splitters and filter wheels • One camera with a rotating filter wheel (air or belt) • Use He-I lines 668, 728, 706 nm for: • Imaging plasma boundary • Measuring ne, Te in the edge > Band at the edge (puff some He) • Other impurities (CI, CII, CIII) localize radial region > impurity monitoring • Plasma positioning • Plasma wall contact Movable Mirror Lens Periscope Lens Filter wheel Camera 1 Beam splitter Camera 2 J. Boedo, UCSD

  9. Fast Multi-Color Cameras 50mm collimating lens 12mm objective lens Boronated polyethelyne shielding box Object Phantom 7.1 Camera Fiber Bundle (2.73m) Or periscope 50mm camera lens Vacuum window at 90R0 Filter Wheel CMOS chip with 12 bit pixel depth. 1 pixel corresponds to ~0.4cm in vessel. 800x600 max spatial resolution. Typically run at 256x256 res., with max possible frame rate of 26,000 sec-1. Camera RAM = 2.8 GB (21,680 frames at 256x256). Inter-ELM image ELM filaments CIII filter, f = 5000 sec-1, exposure = 180ms J. Boedo, UCSD

  10. Movable Divertor Plates • Pivoting point and only change angle • Two movable points • Similar to movable limiters in ALT-II collaboration • Wormscrew actuated from outside (magnetically connected feedthru) Vessel Actuator Pivot point Divertor plate J. Boedo, UCSD

  11. Additional Slides J. Boedo, UCSD

  12. J. Boedo, UCSD

  13. divertor vacuum vessel J. Boedo, UCSD

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