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E u r o S c i C o n J o i n t E v e n t o n
Laser Optics & Photonics and
Atomic & Plasma Science
American Journal of Computer Science and Information Technology
ISSN: 2349-3917
J u l y 1 6 - 1 7 , 2 0 1 8
P r a g u e , C z e c h R e p u b l i c
Page 25
Laser Optics & Photonics and Atomic & Plasma Science 2018
T
ransmission crystal spectrometers have been fielded at the USA National
Ignition Facility and other major international laser and pulsed-power facilities
for the purpose of recording spectra in the >6 keV energy range for studying
the atomic physics and diagnostics of hot, dense plasmas. Spectrometer
sensitivities and spectral resolving powers have been measured at the NIST
national standard X-ray calibration facility. This presentation will describe on-
going efforts to experimentally demonstrate high resolving power (>12,000) using
a compact spectrometer geometry that is compatible withmajor laser and pulsed-
power facilities. Resolving power of 12,000 has already been experimentally
demonstrated using the 8 keV Cu and 22 keV Ag K lines, with the capability for
20,000 resolving power with 0.5 m long spectrometer geometry. Experimentally
measuring such high resolution requires the careful measurement of the detector
spatial resolution, for example of photostimulable image plates and scanners,
and of the source broadening of the spectral lines resulting from natural lifetime
broadening and other effects. These techniques have been developed and
experimentally demonstrated at NIST. The use of these spectrometers at major
laser and pulsed-power facilities for high-resolution spectroscopic diagnostics
and atomic physics of energetic plasmas will be described.
Biography
JohnSeelyaftercompletinghisPhD inPhysicsandseveralPost-
doctoral appointments joined the Naval Research Laboratory in
Washington DC USA in 1977 and was the Head of the Space
Science Division’s UV and X-Ray Spectroscopy Section prior
to his retirement from NRL in 2011. During that time he was
Principal Investigator on numerous projects funded by ONR,
NASA, NOAA, DOE, NSA, and other government agencies. He
also participated in many projects in the NRL Plasma Division
and other divisions. He is the author or co-author of 274 papers
in refereed scientific journals and holds seven patents in EUV
and X-Ray technology. He is author of the chapter on multilayer
optics for space telescopes in the book observing photons in
Space (2010, ESACommunications Productions). He originated
the concept of fielding high resolution hard X-ray spectrometers
using transmission crystals at large laser facilities to record the
K shell and L shell spectra from heavy elements.
seelyjf@gmail.comHigh resolution X-Ray spectroscopy and
atomic physics of high energy density
plasmas using transmission-crystal
spectrometers in the 6-100 keV energy range
John Seely
Artep Inc., Ellicott City, Maryland, USA
The National Institute of Standards and Technology, USA
John Seely, Am J Compt Sci Inform Technol 2018, Volume 6
DOI: 10.21767/2349-3917-C1-001