Flat-field grating spectrometer for high-resolution soft x-ray and extreme ultraviolet measurements on an electron beam ion trap

Beiersdörfer, P.; Magee, E. W.; Träbert, E.; Chen, H.; Lepson, J. K.; Gu, M. F.; Schmidt, M.

doi:10.1063/1.1779609

Cited by 79 publications

(41 citation statements)

References 28 publications

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“…The light from the trapped ion cloud was observed by a flat-field spectrometer [15] equipped with a variable-line spacing grating (radius R=44.3 m, approximate line density 2400 /mm) and a cryogenic, thinned, back-illuminated charge-coupled device (CCD) multichannel detector. Two detectors were used in turn; one had 1024 × 1024 pixels of 25 µm pixel size.…”

Section: Methodsmentioning

confidence: 99%

Soft-X-ray spectra of highly charged Os, Bi, Th, and U ions in an electron beam ion trap

Beiersdörfer¹,

Fournier²,

Chen³

2005

Can. J. Phys.

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Systematic variation of the electron-beam energy in an electron-beam ion trap has been employed to produce soft-X-ray spectra of Os, Bi, Th, and U with highest charge states ranging up to Ni-like ions. Guided by relativistic atomic structure calculations, the strongest lines have been identified with ∆n=0 (n=4 to n =4) transitions in Rb-to Cu-like ions. The rather weak 4p-4d transitions are much less affected by QED contributions than the dominant 4s-4p transitions. Our wavelength measurements consequently provide benchmarks with and (almost) without QED. Because the radiative corrections are not very sensitive to the number of electrons in the valence shell, our data, moreover, provide benchmarks for the evaluation of electron-electron interactions.Résumé francais: (traduit par le journal)

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Section: Methodsmentioning

confidence: 99%

Soft-X-ray spectra of highly charged Os, Bi, Th, and U ions in an electron beam ion trap

Beiersdörfer¹,

Fournier²,

Chen³

2005

Can. J. Phys.

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“…To name a few, these include the ability to produce a quasi-Maxwellian distribution of electron energies [38,39], and the ability to study spectra produced by charge exchange recombination using the magnetic trapping mode [40,41]. The LLNL EBIT facility enjoys a suite of spectrometers for measuring photon emission, including crystal spectrometers [42][43][44], grating spectrometers [45], solid state detectors, and the NASA/GSFC microcalorimeter array [46][47][48]. The flexibility and wide range of parameter space available to the EBITs make them perfectly suited for benchmarking atomic theory and for providing accurate, complete sets of atomic data for interpreting astrophysical spectra.…”

Section: ±032 Later Rocket Borne Experiments Included a Collimated mentioning

confidence: 99%

A brief review of the intensity of lines 3C and 3D in neon-like Fe XVII

Brown¹

2008

Can. J. Phys.

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X-ray emission from neon-like Fe XVII has been measured with high-resolution spectrometers from laboratory or celestial sources for nearly seven decades. Two of the strongest lines regularly identified in these spectra are the 1P1 → 1S0 resonance and the 3D1 → 1S0 intercombination line, known as 3C and 3D, respectively. This paper gives a brief overview of measurements of the intensities of the lines 3C and 3D from laboratory and celestial sources and their comparison to model calculations, with an emphasis on measurements completed using an electron beam ion trap. It includes a discussion of the measured absolute cross sections compared with results from modern atomic theory calculations as well as the diagnostic utility of the relative intensity, R = I3C/I3CD, as it applies to the interpretation of spectra measured from the Sun and extra-solar sources. PACS Nos.: 32.30.Rj, 32.30.–r, 32.70.Cs, 52.72.+v, 95.85.Nv, 96.60.P–, 97.10.Ex

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“…Spectra in the 120 -320 Å were acquired using a 5.6 m 1200 lines/mm grazing-26 incidence spectrometer (similar to the instrument used at SSPX) equipped with a Princeton Instruments CCD 27 detector. High-resolution data of mainly Tm-like W VI, Er-like W VII, and Ho-like W VIII were obtained using a ID 56 7 44.3 m grating spectrometer [51]. Figure 5 illustrates the advantages of scanning the electron-beam energy for 1 interpretation of plasma-produced spectra where the SSPX spectrum is followed by two panels with EBIT tungsten 2 data at E beam = 135 and 163 eV.…”

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confidence: 99%

Atomic data of tungsten for current and future uses in fusion and plasma science

Clementson

Beiersdörfer

Lennartsson

2013

AIP Conference Proceedings

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Abstract. Atomic physics has played an important role throughout the history of experimental plasma 5 physics. For example, accurate knowledge of atomic properties has been crucial for understanding the plasma 6 energy balance and for diagnostic development. With the shift in magnetic fusion research toward high-7 temperature burning plasmas like those expected to be found in the ITER tokamak, the atomic physics of 8 tungsten has become of importance. Tungsten will be a constituent of ITER plasmas because of its use as a 9 plasma-facing material able to withstand high heat loads with lower tritium retention than other possible 10 materials. Already, ITER diagnostics are being developed based on using tungsten radiation. In particular, 11 the ITER Core Imaging X-ray Spectrometer (CIXS), which is designed to measure the core ion temperature 12 and bulk plasma motion, is being based on the x-ray emission of neonlike tungsten ions (W 64+ ). In addition, 13 tungsten emission will at ITER be measured by extreme ultraviolet (EUV) and optical spectrometers to 14 determine its concentration in the plasma and to assess power loss and tungsten sputtering rates. On present-

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Flat-field grating spectrometer for high-resolution soft x-ray and extreme ultraviolet measurements on an electron beam ion trap

Cited by 79 publications

References 28 publications

Soft-X-ray spectra of highly charged Os, Bi, Th, and U ions in an electron beam ion trap

Soft-X-ray spectra of highly charged Os, Bi, Th, and U ions in an electron beam ion trap

A brief review of the intensity of lines 3C and 3D in neon-like Fe XVII

Atomic data of tungsten for current and future uses in fusion and plasma science

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