A New Device for the Study of Electron–Ion Interactions: The Belfast EBIT

Currell, Frederick; Aiken, John; Dunn, K. F.; Kavanagh, Thomas M.; Krastev, V.; Lu, Xueying; Matranga, M.; Morton, A.F.; O’Rourke, Brian; Tawara, H.; Watanabe, Hideo

doi:10.1088/0031-8949/2005/t120/007

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…In the comparison to theory, however, it is still necessary to consider the angular distribution of the emitted photons, since the electron beam provides a quantization axis and all EBIT experiments to date have been carried out by observing perpendicular to the electron beam. The Belfast EBIT (Currell et al 2005) is designed to allow observations at the "magic angle" of 54.7 o in order to yield results which are theoretically identical to the case in which observations are averaged over all angles, but results are not yet available from that EBIT.…”

Section: Adjustment For Polarization and Angular Distribution Of Radimentioning

confidence: 99%

Fe XVII X-RAY LINE RATIOS FOR ACCURATE ASTROPHYSICAL PLASMA DIAGNOSTICS

Gillaspy

Lin

Tedesco

et al. 2011

ApJ

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New laboratory measurements using an Electron Beam Ion Trap (EBIT) and an x-ray microcalorimeter are presented for the n=3 to n=2 Fe XVII emission lines in the 15 Å to 17 Å range, along with new theoretical predictions for a variety of electron energy distributions. This work improves upon our earlier work on these lines by providing measurements at more electron impact energies (seven values from 846 to 1185 eV), performing an in situ determination of the x-ray window transmission, taking steps to minimize the ion impurity concentrations, correcting the electron energies for space charge shifts, and estimating the residual electron energy uncertainties. The results for the 3C/3D and 3s/3C line ratios are generally in agreement with the closest theory to within 10%, and in agreement with previous measurements from an independent group to within 20%. Better consistency between the two experimental groups is obtained at the lowest electron energies by using theory to interpolate, taking into account the significantly different electron energy distributions. Evidence for resonance collision effects in the spectra is discussed. Renormalized values for the absolute cross sections of the 3C and 3D lines are obtained by combining previously published results, and shown to be in agreement with the predictions of converged R-matrix theory. This work establishes consistency between results from independent laboratories and improves the reliability of these lines for astrophysical diagnostics. Factors that should be taken into account for accurate diagnostics are discussed, including electron energy distribution, polarization, absorption/scattering, and line blends.

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Section: Adjustment For Polarization and Angular Distribution Of Radimentioning

confidence: 99%

Fe XVII X-RAY LINE RATIOS FOR ACCURATE ASTROPHYSICAL PLASMA DIAGNOSTICS

Gillaspy

Lin

Tedesco

et al. 2011

ApJ

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Spectroscopy with trapped highly charged ions

Beiersdörfer

2009

Phys. Scr.

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Multi-photon resonance enhanced super high-order harmonic generation

Lin¹,

Zhuang²,

Xi-Jing³

2010

Chinese Phys. B

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This paper proposes highly charged ions pumped by intense laser to produce very high order harmonics. Numerical simulations and full quantum theory of Ne 9+ ions driven by laser pulses at 1064 nm in the power range of 10 9 W/cm 2 ∼ 10 15 W/cm 2 show that the emission spectrum corresponds to the electronic transitions from the excited states to the ground state, which is very different from the spectrum of general high-order harmonic generation. In such situation, harmonic order as high as 1000 can be obtained without producing lower order harmonics and the energy conversion efficiency is close to general high order harmonic generation of hydrogen atom in the same laser field.

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A New Device for the Study of Electron–Ion Interactions: The Belfast EBIT

Cited by 3 publications

References 8 publications

Fe XVII X-RAY LINE RATIOS FOR ACCURATE ASTROPHYSICAL PLASMA DIAGNOSTICS

Fe XVII X-RAY LINE RATIOS FOR ACCURATE ASTROPHYSICAL PLASMA DIAGNOSTICS

Spectroscopy with trapped highly charged ions

Multi-photon resonance enhanced super high-order harmonic generation

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