Spectral emission measurements of lithium on the lithium tokamak experiment

Journal Article · Mon Oct 15 00:00:00 EDT 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4746812· OSTI ID:22093846

Gray, T. K.; Biewer, T. M.; Maingi, R. ^[1]; Boyle, D. P.; Granstedt, E. M.; Kaita, R.; Majeski, R. P. ^[2]

---

1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

There has been a long-standing collaboration between ORNL and PPPL on edge and boundary layer physics. As part of this collaboration, ORNL has a large role in the instrumentation and interpretation of edge physics in the lithium tokamak experiment (LTX). In particular, a charge exchange recombination spectroscopy (CHERS) diagnostic is being designed and undergoing staged testing on LTX. Here we present results of passively measured lithium emission at 5166.89 A in LTX in anticipation of active spectroscopy measurements, which will be enabled by the installation of a neutral beam in 2013. Preliminary measurements are made in transient LTX plasmas with plasma current, I{sub p} < 70 kA, ohmic heating power, P{sub oh}{approx} 0.3 MW and discharge lifetimes of 10-15 ms. Measurements are made with a short focal length spectrometer and optics similar to the CHERS diagnostics on NSTX [R. E. Bell, Rev. Sci. Instrum. 68(2), 1273-1280 (1997)]. These preliminary measurements suggest that even without the neutral beam for active spectroscopy, there is sufficient passive lithium emission to allow for line-of-sight profile measurements of ion temperature, T{sub i}; toroidal velocity and v{sub t}. Results show peak T{sub i} = 70 eV and peak v{sub t} = 45 km/s were reached 10 ms into the discharge.

• OSTI ID: 22093846
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BOUNDARY LAYERS
CHARGE EXCHANGE
ELECTRIC DISCHARGES
ELECTRON TEMPERATURE
EMISSION
ION TEMPERATURE
LIFETIME
LITHIUM
NSTX DEVICE
ORNL
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
RECOMBINATION
SPECTROMETERS
SPECTROSCOPY