X-Ray Spectroscopy and Calibrations in the 50 eV to 60 keV Range

Published

October 12, 2021

Author(s)

J Seely, Uri Feldman, J. Weaver, Lawrence T. Hudson

Abstract

Spectrometers have been developed to record x-ray spectra in the energy range 50 eV to 60 keV. The dispersion elements are transmission crystals for energies higher than approximately 11 keV, reflection crystals for 1 keV to 20 keV, and transmission gratings for energies less than 1 keV. The spectra are recorded on CCD or CMOS detectors with phosphor conversion screens. Silicon photodiodes are positioned in front of the detectors to provide absolute x-ray flux calibrations. The diodes have 1 mm2 area and subnanosecond time response. The diodes, transmission gratings, and attenuation filters were absolutely calibrated using synchrotron radiation. In addition, the diodes were calibrated in pulsed mode using the soft x-ray (70 eV to 250 eV) pulses from individual electron bunches circulating in the storage ring, and a self-calibration model extends the calibration to higher energy. X-ray spectra in the energy range >12 keV were recorded at the OMEGA laser using a transmission crystal. Spectra in the energy range <1 keV were recorded at the NIKE laser using a transmission grating and fast silicon photodiodes. A NIF core diagnostic is being built that covers the 1-20 keV range with one transmission crystal and four reflection crystals.

Citation

Conference on Advanced Diagnostics for Magnetic and Inertial Fusion,

Pub Type

Journals

Keywords

fusion diagnostic, x-ray spectrometer

Citation

Seely, J. , Feldman, U. , Weaver, J. and Hudson, L. (2021), X-Ray Spectroscopy and Calibrations in the 50 eV to 60 keV Range, Conference on Advanced Diagnostics for Magnetic and Inertial Fusion, (Accessed April 19, 2024)