Supported by

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Supported by
NSTX Facility Overview
College WM Colorado Sch Mines Columbia
U Comp-X General Atomics INEL Johns Hopkins
U LANL LLNL Lodestar MIT Nova Photonics New York
U Old Dominion U ORNL PPPL PSI Princeton U Purdue
U SNL Think Tank, Inc. UC Davis UC
Irvine UCLA UCSD U Colorado U Maryland U
Rochester U Washington U Wisconsin
Masa Ono For the NSTX Team
Culham Sci Ctr U St. Andrews York U Chubu U Fukui
U Hiroshima U Hyogo U Kyoto U Kyushu U Kyushu
Tokai U NIFS Niigata U U Tokyo JAEA Hebrew
U Ioffe Inst RRC Kurchatov Inst TRINITI KBSI KAIST
POSTECH ASIPP ENEA, Frascati CEA, Cadarache IPP,
Jülich IPP, Garching ASCR, Czech Rep U Quebec
NSTX Research Forum December 8 - 10, 2008
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NSTX Completed Successful FY 2008 Run

• NSTX has completed 16.6 weeks of experimental
  operations meeting the FY 08 operational Joule
  milestone (out of our planned 15). Produced 2571
  plasma shots in 16 weeks which compares well
  with similar 2460 plasma shots in 2004 but it
  took 21 weeks.
• Dual LITER system has been working flawlessly.
  LITER also largely eliminated He-GDC which
  improved operational efficiency. Dual LITER were
  reloaded with lithium three times (total 200g)
  during the operations.
• Lithium shaker was tested. It appears to reduce
  the density and impurity radiation during the
  long-pulse ELM-free H-mode discharges.
• The EF/RWM feedback control system are now
  routinely used as a tool for advanced long-pulse
  operation.
• The run concluded on July 14. Vent by late July,
  perform diagnostic calibrations, and then begin
  in-vessel activities in late August.

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Diagnostic Systems Operational with Strong
Collaboration Contributions
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FY 08 Outage

• HHFW Antenna upgrade to provide a double power
  feed.
• LLD tray gauge based on Faro Arm measurements of
  passive plates for use by Sandia or PPPL. LLD
  Controls FDR this month.
• BES Vacuum Vessel Ports/Interfaces Complete.
• Platforms and design for the MSE-LIF diagnostic
  nearing completion.
• 16-Channel Bolometer System installed.
• TIV/Shutter System upgrades for improved
  control/more channels.
• Neutral Beams expect to start the run with 3
  spare ion sources.
• Inspections of all TF joints completed (upper and
  lower)
• MDSplus data now being served by Linux/Skylark
  instead of VMS. All are encouraged to try their
  software using the new server.

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• FY09 Start-Up Preparations

Attempting to complete in-vessel diagnostic
calibrations between now and December 20
th. In-vessel prep, cleaning, photos to be
completed, and then install the NB duct over the
holidays. Vessel pump-down and leak check after
the holiday break, immediately followed by a two
week vessel bake. A period of post-bake
diagnostic calibrations (including Rayleigh/Raman
Scattering calibration of MPTS) will be followed
by the ISTP in early February . In this plan,
NSTX plasma operations will start on
mid-February.

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NSTX Facility/Diagnostic Upgrade Plan
Run Weeks
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14
16
b control (NBI)
Heating CD
HHFW ELM Resilience
HHFW Antenna Upgrade
MHD
Divertor Halo Current
BES
Profile / TT
High-k scattering Remote control
P-CHERS(72 ch)
MSE/LIF
Multi-Color-Te(r)
Dual Li Shaker
LLD
Li Shaker
Edge Sample Probe
Divertor Spectrometer
Boundary
Dual LITER
Divertor Bolometer
Fast IR Camera
Energetic Particles
Fast-ion D-alpha Camera
Summer of 2009 outage require careful planning to
minimize down time
CHI
Staged Bank Firing
Absorber Control Coils
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MHD - NSTX Non-Axisymmetric Coil System with Fast
Power Amplifiers Contributed Productively for
MHD Control (n 1, 2, 3 EF, RWM, RMP)
External midplane - 6 coils toroidally
MHD related sensors 1) Ip Rogowskis, Poloidal
Field And Flux, For Equilibrium
Reconstruction 2) External Locked-Mode Detectors
for n1 Identification 3) In-vessel Locked Mode
and RWM Sensors for n1-3 External Mode
Identification 4) High-Frequency Mirnov Arrays
for Toroidal Mode Number Identification (high-n _at_
4MHz and high-f _at_ 5MHz) 5) Poloidal Mirnov Array
at 500 kHz 6) Magnetic Halo Current Sensors at
the Vessel Bottom for Poloidal Halo Currents in
the Vessel Wall 7) Halo Current Rogowskis on the
Center Stack Casing 8) NEW Four "Shunt Tiles"
in Row 3 of the Lower Outboard Divertor.
(resistive shunts buried under the tiles).
Stefan Gerhardt
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Fast Ion D-Alpha Fast Ions DiagnosticA powerful
new addition to the NSTX fast ion diagnostics

• Density profile of fast ions (15 65 keV)
  deduced from Doppler-shifted D? emission by
  energetic neutrals created by charge-exchange
  with NBI neutrals

• Low-frequency (kink) activity redistributes fast
  ions outwards
• Can destabilize Compressional Alfvén Eigenmodes
  (CAEs) in outboard midplane region

• During TAE avalanches, measured fast-ion losses
  up to 30
• Consistent with neutron rate drop
• Profile remains peaked

Avalanche
M. Podesta, APS
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Poloidal Charge-Exchange Recombination emission
Spectroscopy achieved full spatial resolution and
coverage.

• Full system (75 ch active and 63 background ch,
  top bottom symmetric views, 276 ch total )
  installed, commissioned and operated routinely
  for FY 08 run
• Yielded ion-gyro-radius scale poloidal flow
  structures

R. Bell
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Beam Emission Spectroscopy for FY 10

• BES diagnostic
• BES viewing ports installed / lens being procured
• U. Wisconsin manufacturing detectors
• Cable trays and diagnostic room readied
• Aiming to commission in early FY 10

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HHFW Double-Feed Antenna Upgrade
Upgraded Antenna Main Features
Antenna Installation to be completed this week
Present Feed
New Ground
New Feed
Present Ground
Symmetric feed Ground at antenna mid-plane
Maximum radiation at mid-plane Voltage at
feed-thru reduced by 1.4 Power capability
should be up by 2
Antenna Straps
External loops will be installed as soon as
possible, early in the run at high priority
New antenna straps
J. Hosea, R. Ellis
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Boundary Physics Capability Enhanced to Support
FY 09 Joule Milestones
LITHIUM POWDER DROPPER
Three-view Divertor Bolometer
SAMPLE PROBE
Fast IR Camera (ORNL) also being readied
Purdue U
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Liquid Lithium Divertor (LLD) for FY 10
Liquid Lithium Divertor (LLD) will not be
installed until after 2009 run Pursuing
dual-track approach to fabricating Cu-SS-Mo LLD
plates SNL form, laminate SS to Cu, adjust
shape, Mo coat PPPL laminate SS to Cu, bend to
shape, Mo coat FDR on 12/17 for LLD Controls
designed by SNL/NM PPPL design of rack
installation, cable trays, cabling in progress
Continuing development of loading techniques for
LLD in L-245 lab.
Rolled PPPL Test LLD Plates
Copper plate
10 mill ss plate barrier
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Co-axial Helicity Injection

• Role of impurities identifies - Need to minimize
  impurity radiation
• Minimize absorber arc using the absorber coils
  with SPA
• Use of metal to reduce low-Z impurity radiation

Absorber coils to be tested utilizing the SPA
power supplies in 2009
LLD to be used to test metal divertor wall in 2010
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NSTX is Assessing Potential of the ST for fusion

• NSTX has completed 16.6 weeks of very productive
  experimental operations meeting the FY 08
  operational Joule milestone.

• FY 2009 14 run weeks from February through June
  2009
• New/Upgraded Facility Capabilities for FY 09
  Run
• Duel LITER and Li Shakers
• CHI absorber with SPAs
• HHFW Double Feed Antenna (get full loop by
  mid-run)
• NBI feed-back for beta control
• New/Upgraded Diagnostic Capabilities for FY 09
  Run
• Divertor bolometer
• Edge sample probe
• Fast IR camera
• High-k mirror remote steering

• FY 2009 Summer Outage to install LLD, BES,
  MSE-LIF will require careful planning and team
  effort to minimize the down time.

Let us make the best out of the FY 2009 Run!