A global fitting code for multichordal neutral beam spectroscopic data
Knowledge of the heat deposition profile is crucial to all transport analysis of beam heated discharges. The heat deposition profile can be inferred from the fast ion birth profile which, in turn, is directly related to the loss of neutral atoms from the beam. This loss can be measured spectroscopically be the decrease in amplitude of spectral emissions from the beam as it penetrates the plasma. The spectra are complicated by the motional Stark effect which produces a manifold of nine bright peaks for each of the three beam energy components. A code has been written to analyze this kind of data. In the first phase of this work, spectra from tokamak shots are fit with a Stark splitting and Doppler shift model that ties together the geometry of several spatial positions when they are fit simultaneously. In the second phase, a relative position-to-position intensity calibration will be applied to these results to obtain the spectral amplitudes from which beam atom loss can be estimated. This paper reports on the computer code for the first phase. Sample fits to real tokamak spectral data are shown.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114
- OSTI ID:
- 5313443
- Report Number(s):
- GA-A-20915; CONF-920362-32; ON: DE92014258
- Resource Relation:
- Conference: 9. topical conference on high-temperature plasma diagnostics, Santa Fe, NM (United States), 15-19 Mar 1992
- Country of Publication:
- United States
- Language:
- English
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74 ATOMIC AND MOLECULAR PHYSICS
BEAM INJECTION HEATING
SPECTROSCOPY
TOKAMAK DEVICES
BEAM TRANSPORT
CHARGE EXCHANGE
DOPPLER EFFECT
STARK EFFECT
CLOSED PLASMA DEVICES
HEATING
PLASMA HEATING
THERMONUCLEAR DEVICES
700460* - Fusion Technology- Heating & Fueling Systems
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664200 - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)