نتایج جستجو برای: ray spectrometer
تعداد نتایج: 321697 فیلتر نتایج به سال:
R. K. Smith, M. H. Abraham, R. Allured, M. Bautz, J. Bookbinder, J. N. Bregman, L. Brenneman, N. S. Brickhouse, D. N. Burrows, V. Burwitz, R. Carvalho, P. N. Cheimets, E. Costantini, S. Dawson, C. DeRoo, A. Falcone, A. R. Foster, C. E. Grant, R. K. Heilmann, E. Hertz, B. Hine, D. Huenemoerder, J. S. Kaastra, K. K. Madsen, R. L. McEntaffer, E. D. Miller, J. Miller, E. Morse, R. Mushotzky, K. Nan...
We present the design and analysis of a new gamma ray spectrometer for planetary science that uses an array of CdZnTe detectors to achieve the detection efficiency needed for orbital measurements. The use of CdZnTe will provide significantly improved pulse height resolution relative to scintillation-based detectors, with commensurate improvement in the accuracy of elemental abundances determine...
A compact focusing crystal spectrometer based on the von Hamos scheme is described. Cylindrically curved mica and graphite crystals with a radius of curvature of Rϭ20 mm are used in the spectrometer. A front illuminated charge-coupled device ͑CCD͒ linear array detector makes this spectrometer useful for real-time spectroscopy of laser-produced plasma x-ray sources within the wavelength range of ...
Thomas Bristow, Robert Downs, Marc Gailhanou, Franck Marchis, Douglas Ming, Richard Morris, Vicente Armando Solé, Kathleen Thompson, Philippe Walter, Michael Wilson, Albert Yen and Samuel Webb, NASA Ames Research Center, Moffett Field, CA [email protected], SETI Institute, Mountain View, CA, Univ. of Arizona, Tucson AZ, IM2NP, Université Paul Cézanne, Marseille, France, NASA Johnson Space Ce...
We have built a 36-pixel high-resolution superconducting tunnel junction (STJ) soft X-ray spectrometer for chemical analysis of dilute metals by fluorescence-detected X-ray absorption spectroscopy (XAS) at the Advanced Light Source synchrotron. Soft X-ray absorption edges are preferred over traditional hard X-ray spectroscopy at the K-edges, since they have narrower natural linewidths and exhib...
We present a table-top soft-x-ray spectrometer for the wavelength range λ = 1-5 nm based on a stable laser-driven x-ray source, making use of a gas-puff target. With this setup, optical light-pump/soft-x-ray probe near-edge x-ray absorption fine structure (NEXAFS) experiments with a temporal resolution of about 230 ps are feasible. Pump-probe NEXAFS measurements were carried out in the "water-w...
30TH INTERNATIONAL COSMIC RAY CONFERENCE Cosmic-ray helium intensities over the solar cycle from ACE
Observations of cosmic-ray helium energy spectra provide important constraints on cosmic ray origin and propagation. However, helium intensities measured at Earth are affected by solar modulation, especially below several GeV/nucleon. Observations of helium intensities over a solar cycle are important for understanding how solar modulation affects galactic cosmic ray intensities and for separat...
The Cupric oxide (CuO) nanostructures and Fe doped CuO nanomaterials are synthesized by microwave irradiation method. effect of doping on the crystal structure, band gap optical properties samples were characterized using x-ray diffraction, ultraviolet-visible spectrometer, photoluminescence spectrometer Fourier transform infrared spectrometer. X-ray diffraction study confirms size particle in ...
During Phase 2 of our study of the CIXS conceptual design we have tackled additional important issues that are unique to the ITER environment. These include the thermal control of the crystal and detector enclosures located in an environment with a 100°–250° C ambient temperature, tritium containment, and the range of crystal and detector movement based on the need for spectral adjustments and ...
The modeled performance of the Alpha Magnetic Spectrometer (AMS) as a high-energy (0.3 to 100 GeV) gamma-ray detector is described, and its gamma-ray astrophysics objectives are discussed.
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