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Boundary Diagnostics

NSTX-U Boundary Diagnostics Measurement Capabilities – January 2015

(black – available for experiments, blue – under active development)

Physics Measurement

Typical range and coverage

Spatial; Temporal Resolution

Typical Precision

Available Diagnostic Techniques

Comment

Contact

Edge recycling and impurity influx

 

2 kHz

5% (rel)

EIES (filterscopes)

 5 upper divertor, 5 lower divertor, 5 midplane inner wall.  Filters include D-alpha, CII, CIII, He I, HeII, LiI, LiII, BII, OII

V. Soukhanovskii – LLNL

 

36 kHz

5% (rel)

Filtered 1D CCD arrays

3 lower divertor, 2 inner wall,

2 upper divertor. Filters include D-alpha, D-beta, D-gamma, CII, CIII, CIV, LiI, LiII, HeI, HeII

V. Soukhanovskii – LLNL

 

1 kHz or lower

5% (rel)

Divertor Imaging Spectrometer - DIMS

19 sightlines coupled via fiber to 0.61m Czerny-Turner; 350-1100 nm, CCD detector.

Divertor ion temperature measurements (via Doppler broadening) under development.

V. Soukhanovskii - LLNL

 

2 kHz or lower

5% (rel)

Divertor vacuum ultraviolet spectrometer SPRED

1 sightline; two gratings: 102-310 Å and 165-1650 Å , CCD detector.

Real-time divertor feedback control signal under development.

V. Soukhanovskii - LLNL

 

1 kHz or lower

5% (rel)

Divertor Control Spectrometer - DICS

26 sightlines coupled via fiber to 0.3m Czerny-Turner-Schmitt; 300-1100 nm, CCD detector.

Real-time divertor feedback control signal under development.

V. Soukhanovskii - LLNL

 

0.1 kHz

5% (rel)

Near-infrared spectrometer - NIRS

1 sightline via fiber, 3 NIR-optimized gratings, 0.5 m Czerny-Turner, InGaAs LN-cooled detector, 800-2400 nm. Presently at DIII-D.

V. Soukhanovskii - LLNL

 

500 kHz or lower

12 bit

Divertor Control Camera

Horizontal divertor view with Phantom V1211.  Real-time divertor feedback control signal under development.

V. Soukhanovskii, F. Scotti -  LLNL

 

Up to 100 kHz

at 256x208 resolution

12 bit, 14 bit

Downward facing wide angle divertor fast cameras

View of lower divertor from Bay E-top (Phantom 710) and Bay J-top (Phantom 7.3).

F. Scotti – LLNL

 

Up to 8 kHz at 256x256 resolution

12 bit

Upward facing wide angle divertor fast camera

View of upper divertor from Bay H-bottom (Miro 4).

F. Scotti – LLNL

 

30 Hz, VGA resolution

8 bit

Two-color radiation-hardened intensified CIDTEC camera

View of lower divertor from Bay I-top

F. Scotti – LLNL

 

30 Hz, VGA resolution

8 bit

Radiation-hardened intensified CIDTEC camera

Midplane view

F. Scotti – LLNL

 

6 ms, 128x128

12 bit

Edge Neutral Density Diagnostic (ENDD)

Tangential view of outer midplane edge – Bay G

CII filter

F. Scotti – LLNL

 

190 kHz at 32x32

14 bit

Lower divertor tangential camera

Tangential image of lower divertor from Bay F (Phantom 7.3)

R. Maqueda – X Science

350-900 nm

range

0.08nm/pixel

dispersion

5ms

 

Imaging Spectrometer at bay G bottom viewing upper Divertor (R=0.3-0.9m) and at bay J middle viewing central stack (Z=0-1.5m)

Monitor upper divertor and center stack with 16 sightlines separately (not simultaneously for both views) 16 sightlines via fiber to IsoPlane SCT 320 spectrometers and 512*512 detector CCD, monitor ratios of spectrally close C and Li lines

 

K.F. Gan-UTK,

T.K. Gray-ORNL

 

Dust monitoring

 

Few seconds

1 mg/cm2

Electrostatic grid detector

Biased fine pitch PC grid, pulse counting electronics, Bay C bottom

C. Skinner - PPPL

First wall deposition

 

2 sec continuous

several

Angstroms

Quartz microbalances

Four QMBs  (Bay E top, Bay F bottom, Bay I midplane, Bay B midplane), 3 shuttered, Inficon XTM/2

C. Skinner - PPPL

Surface chemical state and composition

<1 micron

Outboard lower divertor. Single location intershot

 

Materials Analysis Particle Probe (MAPP) utilizes multiple surface-science measurement techniques to characterize a sample material exposed to NSTX conditions

Thermal Desorption Spectroscopy (TDS), X-ray Photoelectron Spectroscopy (XPS), Low energy Ion Secondary Scattering (LEISS), and Direct Recoil Spectroscopy (DRS)

J. P. Allain – U. Illinois Urbana-Champaign

Target Langmuir probes

1 – 40 eV

1017 – 1020 m-3

~1mm electrode heads poloidally distributed along center stack and outboard divertors

 

Classical interpretation yields ne, Te, V. Non-local interpretation yields additional Vp and EEDF

Proud probes distributed poloidally throughout machine.  Up-down symmetric on outboard divertor target, inboard divertor targets and center stack column.  Operated as swept probes and in Isat mode.

M. Jaworski - PPPL

Gas pressure at several locations

 

 

 

Penning gauges

1 in lower divertor, 1 in upper divertor, 1 in lower divertor with spectroscopy, 1 in inner lower divertor (organ pipe)

R. Raman – U. Washington, V. Soukhanovskii - LLNL

 

 

 

Micro-ion gauges

Bays E and C-midplane, Bay L-pumping duct, Bay C-top

R. Raman – U. Wash

Gas composition in vacuum vessel

typ A = 1-50/100, ∆A=1

Approx. 1 min./1 sec. mass sweep

10-11 /10-9 torr typical sens.

2 Residual gas analyzers (continuous monitoring/after discharge measurements)

In Bay L pumping duct, differentially pumped system

W. Blanchard - PPPL

Plasma TV (discharge monitoring)

Fisheye-view of vessel interior, complementing views from bays B and I

~1cm spatial resolution

 

Qualitative discharge and operations monitoring via in-vessel imaging.

Plasma TV (Miro 2)

M. Jaworski, S. Zweben

 

 

 

 

RF antenna view (Phantom 4.1)

R. Perkins

First wall temperature

50-800°C

1.6 kHz

12° FOV

5 mm/pixel

5% typical

 

Fast, dual-band infrared camera at Bay G bot viewing upper divertor (R = 0.2 – 1.0 m). Calibrated to 4-6 μm (MWIR) / 7-10 μm (LWIR) intensity

SBFP ImagIR HgCdTe camera (128x128 pixels)

T.K. Gray, J.-W. Ahn - ORNL

50-800°C

1.6 kHz

12° FOV

5 mm/pixel

5% typical

 

Fast, dual-band infrared camera at Bay H top viewing lower divertor (R = 0.2 – 1.0 m). Calibrated to 4-6 μm (MWIR) / 7-10 μm (LWIR) intensity

SBFP ImagIR HgCdTe camera (128x128 pixels)

T.K. Gray, J.-W. Ahn - ORNL

20-800°C

30 Hz

40° FOV

4 mm/pixel

>180° view of strike points

5% typical

Wide-angle, two-color infrared camera

FLIR Tau 640 mbolometer camera (640x480 pixels). Re-entrant view of lower divertor from Bay H top (R=0.2 to 1.2 m). Calibrated to 8-10 μm (LWIR) / 10.5-13 μm (LWIR) intensity ratio.

J-W. Ahn - ORNL

20-1200°C

30 Hz

18° FOV

2 mm/pixel

5°C abs

<1°C rel

Standard frame rate, single-band infrared camera

FLIR Tau 640 8-13 μm LWIR mbolometer camera (640x480 pixels). View from Bay B midplane of RF antenna straps at  Bay D, E, and F.

R. Perkins – PPPL, T.K. Gray - ORNL

0-2300°C

1 kHz

2 locations, 2 mm isolation

3% typical

Fast ‘eroding’ thermocouples

2 high speed, Type C eroding thermocouples at PFC surface. Located in the row 1 tile in the upper and lower inboard, horizontal divertor

T.K. Gray - ORNL

Vacuum Vessel Illumination

 

 

 

3 in-vessel tungsten filaments, ~ 25x5 mm  helical

Provide lighting of the first-wall surfaces, Bays G and K near midplane, Bay K/L above midplane

W. Blanchard - PPPL

RF driven surface waves

 

 

 

High-frequency Langmuir probe

Located between antenna segments,

R. Perkins – PPPL,

C. Lau - ORNL