High-resolution grazing-incidence grating spectrometer for temperature measurements of low-Z ions emitting in the 100–300 Å spectral band

Journal Article · Fri Sep 19 00:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4894388· OSTI ID:1366921

Widmann, K. ^[1]; Beiersdorfer, P. ^[1]; Magee, E. W. ^[1]; Boyle, D. P. ^[2]; Kaita, R. ^[2]; Majeski, R. ^[2]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

In this paper, we have constructed a high-resolution grazing-incidence spectrometer designed for measuring the ion temperature of low-Z elements, such as Li⁺ or Li^{2 +}, which radiate near 199 Å and 135 Å, respectively. Based on measurements at the Livermore Electron Beam Ion Trap we have shown that the instrumental resolution is better than 48 mÅ at the 200 Å setting and better than 40 mÅ for the 135-Å range. Such a high spectral resolution corresponds to an instrumental limit for line-width based temperature measurements of about 45 eV for the 199 Å Li+ and 65 eV for the 135 Å Li^{2 +} lines. Finally, recently obtained survey spectra from the Lithium Tokamak Experiment at the Princeton Plasma Physics Laboratory show the presence of these lithium emission lines and the expected core ion temperature of approximately 70 eV is sufficiently high to demonstrate the feasibility of utilizing our high-resolution spectrometer as an ion-temperature diagnostic.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-07NA27344; AC02-09CH11466
• OSTI ID: 1366921
• Report Number(s): LLNL-JRNL-655334
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; ISSN 0034-6748
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
plasma temperature
diffraction gratings
grating spectrometers
temperature measurement
lithium