Ion source spectroscopy on PBFA II
- and others
Light-ion ICF experiments on the PBFA II accelerator provide a unique opportunity to investigate ion beam source physics at the anode of an applied-B ion diode. Spectroscopic observations of the anode plasma have been made in the visible; various atoms and ions, including CII, CIII, CIV, and LiI have been identified. The spectral line profiles show strong broadening and shifting. A line-fitting code that accounts for Zeeman splitting, Stark shifting, and instrumental, Doppler, and Stark broadening has been used to analyze these profiles. Calculations have been done to check that the lines analyzed are optically thin. An electron density of {approximately}2x10{sup 23} m{sup {minus}3} in the anode plasma is measured from Stark shifts of Li I 2s-2p (6708 {Angstrom}). This is the largest electric field ever measured with spectroscopic methods. The CIV ion temperature, as derived from deconvolved Doppler broadening, is 0.5-2.5 keV. The mechanism responsible for generating the unexpected high source temperature is under investigation. Evidence for the high temperature, and further spectroscopic results, will be presented.
- OSTI ID:
- 127943
- Report Number(s):
- CONF-920376--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 37; ISSN BAPSA6; ISSN 0003-0503
- Country of Publication:
- United States
- Language:
- English
Similar Records
Visible spectroscopy measurements in the PBFA II (Particle Beam Fusion Accelerator) ion diode
Visible spectroscopy measurements in the PBFA II ion diode (invited)