Measurement of the radiative cooling rates for high-ionization species of krypton using an electron beam ion trap
- Max-Planck-Institut fuer Plasmaphysik, Bereich Plasmadiagnostik, EURATOM Association, D-10117 Berlin, (Germany)
- University of California, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
We describe a measurement of the radiative cooling rate for krypton made at the Berlin electron beam ion trap (EBIT). The EBIT was tuned to a charge-state distribution approaching the ionization balance of a plasma at a temperature of about 5 keV. To determine the cooling rate, we made use of EBIT's capabilities to sample a wide range of electron-beam energies and distinguish between different radiation channels. We have measured the x-ray emission from bremsstrahlung, radiative recombination, dielectronic recombination, and line radiation following electron-impact excitation. The dominant contribution to the cooling rate is made by the n=3-2, n=4-2,... x rays of the L-shell spectra of krypton, which produce more than 75% of the total radiation loss. A difference with theoretical calculations is noted for the measured total cooling rate. The predicted values are lower by a factor of 1.5-2, depending on the theoretical model. For our measurement of the cooling rate, we estimate an uncertainty interval of 22-30 %. (c) 2000 The American Physical Society.
- OSTI ID:
- 20215474
- Journal Information:
- Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Vol. 61, Issue 2; Other Information: PBD: Feb 2000; ISSN 1063-651X
- Country of Publication:
- United States
- Language:
- English
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