Measurements of quantum electrodynamic sensitive transitions in Na-like and Cu-like ions: Final report, 1 October 1993--29 September 1994

Technical Report · Sat Dec 31 04:00:00 EST 1994

DOI:https://doi.org/10.2172/61210· OSTI ID:61210

Reader, J

The object of this research was to use the GDL laser at the Laboratory for Laser Energetics at the University of Rochester to measure the energies of spectral transitions that would be of importance for testing the accuracy of calculations used to predict properties of plasmas found in inertial fusion experiments as well as in tokamaks and x-ray lasers. The general method to be used for this experiment was to focus the beam from the GDL laser to a small point so as to create a laser-produced plasma of the material of interest. Light from the plasma was to be photographed with a 2.2-m grazing incidence spectrograph transported to Rochester from NIST. The region of observation was 10--300 {angstrom}. In the initial phase of the work a series of spectrograms were made of highly ionized iron. For this a special target chamber was fabricated at NIST and interfaced to the light beam from the GDL laser. The results for iron provided valuable data for Li-like iron, Fe{sup 23+}. Fig. 2 shows an example of the spectrum obtained in the region of 30--40 {angstrom}. The lower spectrum shows intense lines of Fe{sup 23+}, obtained by focusing the GDL beam tightly onto the target surface. For the upper spectrum the GDL beam was focused slightly in front of the target, producing lines of Fe{sup 23+} that are much reduced in intensity. The lines of Fe{sup 23+} in the 30--40 {angstrom} region were observed for the first time in this experiment. Measurement of their wavelengths provided the following comparison with ab initio values calculated with the Dirac-Fock quantum mechanics computer code of Desclaux. After completing the observations for Li-like iron, the GDL laser was shut down for the planned upgrade to much higher energy. The 2.2-m spectrograph was shipped back to NIST. Extensive work was undertaken to interface the NIST target chamber to the 30-cm-diameter beam of the upgraded GDL laser. The NIST system is now ready for use with the upgraded GDL laser.

• Research Organization: National Inst. of Standards and Technology, Gaithersburg, MD (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG03-93SF20143
• OSTI ID: 61210
• Report Number(s): DOE/SF/20143--T2; ON: DE95011593
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CATIONS
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
ICF DEVICES
IRON IONS
LASER-PRODUCED PLASMA
MODIFICATIONS
PLASMA DIAGNOSTICS
PROGRESS REPORT
RESEARCH PROGRAMS
THEORETICAL DATA
TOKAMAK DEVICES
X-RAY LASERS