Diagnostic Development for ST Plasmas on NSTX

Technical Report · Mon Jun 16 00:00:00 EDT 2003

DOI:https://doi.org/10.2172/814679· OSTI ID:814679

Johnson, D

Spherical tokamaks (STs) have much lower aspect ratio (a/R) and lower toroidal magnetic field, relative to tokamaks and stellarators. This paper will highlight some of the challenges and opportunities these features pose in the diagnosis of ST plasmas on the National Spherical Torus Experiment (NSTX), and discuss some of the corresponding diagnostic development that is underway. The low aspect ratio necessitates a small center stack, with tight space constraints and large thermal excursions, complicating the design of magnetic sensors in this region. The toroidal magnetic field on NSTX is less than or equal to 0.6 T, making it impossible to use ECE as a good monitor of electron temperature. A promising new development for diagnosing electron temperature is electron Bernstein wave (EBW) radiometry, which is currently being pursued on NSTX. A new high-resolution charge exchange recombination spectroscopy system is being installed. Since non-inductive current initiation and sustainment ar e top-level NSTX research goals, measurements of the current profile J(R) are essential to many planned experiments. On NSTX several modifications are planned to adapt the MSE technique to lower field, and two novel MSE systems are being prototyped. Several high speed 2-D imaging techniques are being developed, for viewing both visible and x-ray emission. The toroidal field is comparable to the poloidal field at the outside plasma edge, producing a large field pitch (>50{sup o}) at the outer mid-plane. The large shear in pitch angle makes some fluctuation diagnostics like beam emission spectroscopy very difficult, while providing a means of achieving spatial localization for microwave scattering investigations of high-k turbulence, which are predicted to be virulent for NSTX plasmas. A brief description of several of these techniques will be given in the context of the current NSTX diagnostic set.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC) (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 814679
• Report Number(s): PPPL-3822; TRN: US0304307
• Resource Relation: Other Information: PBD: 16 Jun 2003
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASPECT RATIO
CHARGE EXCHANGE
DIAGNOSIS
ELECTRON TEMPERATURE
ELECTRONS
EMISSION SPECTROSCOPY
FLUCTUATIONS
INCLINATION
MAGNETIC FIELDS
MODIFICATIONS
MONITORS
RECOMBINATION
SPECTROSCOPY
STELLARATORS
VELOCITY
DIAGNOSTICS
LIGHT SCATTERING
OPTICAL SPECTROSCOPY
SPHERICAL TORUS
SPHERICAL TOKAMAK
THOMSON SCATTERING