Time-dependent, x-ray spectral unfolds and brightness temperatures for intense Li{sup +} ion beam-driven hohlraums
- Sandia National Laboratories Albuquerque, New Mexico 87185 (United States)
X-ray-producing hohlraums are being studied as indirect drives for inertial confinement fusion targets. In a 1994 target series on the PBFAII accelerator, cylindrical hohlraum targets were heated by an intense Li{sup +} ion beam and viewed by an array of 13 time-resolved, filtered x-ray detectors (XRDs). The unfold operator (UFO) code and its suite of auxiliary functions were used extensively in obtaining time-resolved x-ray spectra and radiation temperatures from this diagnostic. The UFO was also used to obtain fitted response functions from calibration data, to simulate data from blackbody x-ray spectra of interest, to determine the suitability of various unfolding parameters (e.g., energy domain, energy partition, smoothing conditions, and basis functions), to interpolate the XRD signal traces, and to unfold experimental data. The simulation capabilities of the code were useful in understanding an anomalous feature in the unfolded spectra at low photon energies ({le}100 eV). Uncertainties in the differential and energy-integrated unfolded spectra were estimated from uncertainties in the data. The time{endash}history of the radiation temperature agreed well with independent calculations of the wall temperature in the hohlraum. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 451896
- Report Number(s):
- CONF-960543-; ISSN 0034-6748; TRN: 97:006254
- Journal Information:
- Review of Scientific Instruments, Vol. 68, Issue 1; Conference: 11. annual high-temperature plasma diagnostics conference, Monterey, CA (United States), 12-16 May 1996; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
THERMONUCLEAR FUELS
PLASMA DIAGNOSTICS
X-RAY SPECTRA
X-RAY SPECTROSCOPY
X-RAY DETECTION
CALIBRATION
PLASMA SIMULATION
LITHIUM
BLACKBODY RADIATION
BRIGHTNESS
ICF DEVICES
ION BEAMS
LITHIUM IONS
TIME RESOLUTION
TEMPERATURE MEASUREMENT
TIME DEPENDENCE
COMPUTERIZED SIMULATION
COMPUTER CODES
DATA ANALYSIS
particle beam fusion accelerators
plasma inertial confinement
fusion reactor ignition
plasma beam injection heating
time resolved spectroscopy
plasma temperature
spectral analysis