Atomic emission spectroscopy in high electric fields Page: 1 of 24
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Atomic Emission Spectroscopy in High Electric Fields
J.E. Bailey, A.B. Filuk, A.L. Carlson, D.J. Johnson, P. Lake, E.J. McGuire,
T.A. Mehlhorn, T.D.Pointon, T.J. Renk, and W.A. Stygar. 2 w
Sandia National Laboratories, Albuquerque, N.M., 87185
and
Y. Maron and E. Stambulchik
Weizmann Institute of Science, Rehovot, Israel, 76100
ABSTRACT
Pulsed-power driven ion diodes generating quasi-static, -10 MV/cm, 1-cm scale-length
electric fields are used to accelerate lithium ion beams for inertial confinement fusion
applications. Atomic emission spectroscopy measurements contribute to understanding
the acceleration gap physics, in particular by combining time- and space-resolved
measurements of the electric field with the Poisson equation to determine the charged
particle distributions. This unique high-field configuration also offers the possibility to
advance basic atomic physics, for example by testing calculations of the Stark-shifted
emission pattern, by measuring field ionization rates for tightly-bound low-principal-
quantum-number levels, and by measuring transition-probability quenching.
INTRODUCTION
The light-ion beam approach to inertial confinement fusionproposes to achieve
the required high energy density by accelerating a lithium ion beam to about
30 MeV using one or two acceleration stages, each driven with a high-power
(-100 TW), -30-nsec-duration pulse. Present experiments at the Particle Beam
Fusion Accelerator II (PBFA II) facility routinely generate quasi-static, -10 MV/
cm, -1 cm scale-length electric fields. This enables experiments studying the
physics of the ion beam acceleration gap and these conditions also present a unique
opportunity for extending experimental atomic physics into the 10 MV/cm regime.
This paper describes our application of atomic spectroscopy to ion diode plasma
physics issues, with an emphasis on the atomic physics required to understand the
results. In addition, we describe preliminary experiments that illustrate the potential
of using data from this device for basic atomic physics.
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Bailey, J. E.; Filuk, A. B. & Carlson, A. L. Atomic emission spectroscopy in high electric fields, article, December 31, 1995; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc669488/m1/1/: accessed March 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.