Thompson_HTPD_2018_poster_final

Diagnostic Suite of the C-2W Advanced Beam-Driven Field-Reversed Configuration Plasma Experiment
Abstract
Plasma Jet Diagnostics
Inner Divertor Diagnostics
M. C. Thompson, T. Schindler, H. Gota, S. Putvinski, M. Tuszewski, M. W. Binderbauer, and the TAE Team
TAE Technologies, Inc., 19631 Pauling, Foothill Ranch, CA 92610 C-2W Diagnostic Overview
Core Thomson Scattering
Core FIR Interferometer & Polarimeter
n The four main zones of C-2W will have 40 + types of diagnostics: n Core plasma inside the FRC separatrix.
n Open-field-line mirror-confined plasma in the scrape-off layer (SOL) and jet. n Rapidly expanding plasma in the inner divertors and/or end divertors.
n FRC formation sections.
End Loss Analyzers
High-Speed Filtered Imaging
FRC core in the confinement vessel.
Cross Section of Mid-Plane
n FIR Chord Ports
n 100 Channel Bolometer
n Bremsstrahlung and Dα Fan
n Secondary Electron Emission Neutral Beam Profile Monitor
Spatially Resolved Internal B Field:
Evaluating techniques such as Hanle effect detection of field null positions and Doppler Free Saturation Spectroscopy.
n Mineral Insulated Rogowski Coil
Courtesy - T. Roche and ARi Industries
Courtesy - T. Roche and ARi Industries
Prototype C-2W Mirnov Probe
Confinement Vessel Model with Cut Away Showing B-dot / Flux Loops
Full C-2W CAD Model
§New Nd:YAG laser with two modes: §30 pulses at 1 kHz, ≥ 2 J / pulse §6 pulses 10-20 kHz, ≥ 2 J / pulse
FRC Core Thomson
Courtesy – K. Zhai and T. Schindler
C-2W Thomson Scattering Kan Zhai 6.29 Tania Schindler 4.55 Angelica Ottaviano 12.16
Shot 105016
§Scattered light collection at 16 points spread between the core and SOL.
§Up to 480 Te measurements per C-2W shot.
Collection Optics Installation
Fiber Spatial Calibration
The new C-2W experiment (also called “Norman”) at TAE Technologies, Inc. studies the evolution of field-reversed configuration (FRC) plasmas sustained by neutral beam injection. Data on the FRC plasma performance is provided by a comprehensive suite of diagnostics that includes over 600 magnetic sensors, four interferometer systems, multi-chord far- infrared polarimetry, two Thomson scattering systems, ten types of spectroscopic measurements, multiple fast imaging cameras with selectable atomic line filters, bolometry, reflectometry, neutral particle analyzers, and fusion product detectors. Most of these diagnostic systems are newly built using experience and data from the preceding C-2U experiment [1] to guide the design process. In addition, extensive ongoing work focuses on advanced methods of measuring the internal FRC magnetic field profile to facilitate equilibrium reconstruction and active control of the plasma.
[1] M.C. Thompson et al., Rev. Sci. Instrum. 87, 11D435 (2016)
Plasma Jet Interferometer
§ Up to 6 chords across the jet near the mirror region between confinement vessel and inner divertor.
§ Duel wavelength setup to handle large density swing between FRC translation and sustainment:
§ CO2 laser at 10.6 μm
§ Microwave sources at 1 mm
Courtesy – R. Smith
Jet Thomson Scattering
§ New Nd:YAG laser that generates 4 pulses at 100 Hz with ≥ 2 J / pulse.
§ Scattered light collection at 5 points spread across the plasma jet in the mirror region.
§Jet and Core Thomson lasers can be swapped in case we need higher resolution in the jet.
Courtesy – K. Zhai and T. Schindler
n C-2W Mid-Plane Laser Interferometer:
n 14 Chords of Far Infrared (FIR) laser at 433 μm.
PhaseShift:fI =2.81´10-15lònedl
n High sensitivity and full coverage into the scrape-off
layer.
n Polarimetry Function: 7 sensitive to Bθ , 7 sensitive
to Bθ and Bz.
End On View
FaradayRotation Angle: yF =2.62´10-13l2òneB//dl
Side View
Far Infrared Laser Interferometry Bihe Deng 10.40
Courtesy – B. Deng
Inner Divertor Internal Magnets and Cyropanels
§Inner Divertor Diagnostics Include: § Magnetic Probe and Flux Loops §Rogowski Coils
§End Loss Analyzers
§High Speed Cameras
§ Survey and Doppler Spectroscopy
§ §
Divertor Interferometer
Five chords across the expanding plasma column in the inner divertor.
Long rectangular vacuum window on the top port to allow variable chord position.
§ High sensitivity to detect the expected low plasma density.
§ Microwave sources at 3.9 mm Courtesy – D. Sheftman
Shape & Position
Density & Fluctuation
Temperature & Radiation
Fast Ions & Neutrals
North/South Formation Flux Loops
CO2 Interferometer
Thomson Scattering
Electrostatic NPA
Formation High Speed Camera
Far-Infrared Interferometer
Bolometer Arrays
Electromagnetic NPA
Confinement Bz Probes
Thomson Scattering
Doppler Spectroscopy
Neutral Particle Bolometer Arrays
Confinement Flux Probes
Dispersion Interferometers
Survey Spectrometers
Pyro Bolometers
Mirnov Probe Arrays
Microwave Interferometers
VUV Spectrometer
SEE Detectors
Longitudinal Bolometer Arrays
Density Fluctuation Reflectometer
Line Ratio Spectroscopy
Neutron Detectors
Transverse Bolometer Arrays
B Field Fluctuation Reflectometer
Impurity Line Monitors
Proton Detectors
Bremsstrahlung Arrays
Mirnov Probe Arrays
Visible Bremsstrahlung Array
Dα Monitors
End-View High Speed Camera
Triple Probes
IR Bremsstrahlung Array
Dα /Dβ Intensity Ratios
Side-View High Speed Camera
Mach Probes
He-Jet Mach Nozzle
Fast Ionization Gauges
Multi-Chord Interferometry
Gundestrup Probe
Langmuir Probes
Residual Gas Analyzers
Additional TAE Posters:
Inner Divertor Insertable Probe
Ami DuBois 2.53
Fast Imaging of Compact Toroid Injectors Tadafumi Matsumoto 4.36
Dual-Wavelength Interferometry Roger Smith 6.13
Absolute Calibration of NPAs
Ryan Clary 6.40
Jet Outflow Measurements
Daniel Sheftman 6.43
Internal B Field of FAT-CM FRC Experiment Hiroshi Gota 6.48
Dispersion Interferometry on C-2W Michael Beall 8.30
Fast Imaging and Applications
Erik Granstedt 8.32
Additional TAE Posters:
C-2W Magnetic Measurement Suite Thomas Roche 8.36
FIDA Diagnostic Development Nathan Bolte 8.38
Compact Toroid Injector Measurements Ian Allfrey 8.42
SEE Detectors for Neutral Beams James Titus 10.24
Madison Symmetric Torus Fusion Protons Richard Magee 10.29
Zeff using VIS & IR Bremsstrahlung Marcel Nations 14.43
Doppler Backscattering on C-2W Lothar Schmitz 10.32
CHERS Diagnostics on C-2W Deepak Gupta 14.39
Abridged Table of Planned C-2W Diagnostics Capabilities
Courtesy E. Granstedt
Courtesy M. Griswold
Courtesy - T. Roche