Calibration of the OHREX high-resolution imaging crystal spectrometer at the Livermore electron beam ion traps [Calibration of the OHREX high-resolution imaging crystal spectrometer at the Livermore EBIT]

Hell, N.; Beiersdorfer, P.; Magee, E. W.; Brown, G. V.

doi:10.1063/1.4959947

Calibration of the OHREX high-resolution imaging crystal spectrometer at the Livermore electron beam ion traps [Calibration of the OHREX high-resolution imaging crystal spectrometer at the Livermore EBIT]

Journal Article · Thu Aug 04 04:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4959947· OSTI ID:1289380

^[1]; ^[2]; Magee, E. W. ^[2]; Brown, G. V. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. Erlangen-Nurnberg, Bamberg (Germany)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, we report the calibration of the Orion High-Resolution X-ray (OHREX) imaging crystal spectrometer at the EBIT-I electron beam ion trap at Livermore. Two such instruments, dubbed OHREX-1 and OHREX-2, are fielded for plasma diagnostics at the Orion laser facility in the United Kingdom. The OHREX spectrometer can simultaneously house two spherically bent crystals with a radius of curvature of r=67.2 cm. The focusing properties of the spectrometer allow both for larger distance to the source due to the increase in collected light and for observation of extended sources. OHREX is designed to cover a 2.5–3 degree spectral range at Bragg angles around 51.3 degree. The typically high resolving powers at these large Bragg angles are ideally suited for line shape diagnostics. For instance, the nominal resolving power of the instrument (> 10000) is much higher than the effective resolving power associated with the Doppler broadening due to the temperature of the trapped ions in EBIT-I. The effective resolving power is only around 3000 at typical EBIT-I conditions, which nevertheless is sufficient to set up and test the instrument’s spectral characteristics. We have calibrated the spectral range for a number of crystals using well known reference lines in first and second order, and derived the ion temperatures from these lines. We have also made use of the 50µm size of the EBIT-I source width to characterize the spatial focusing of the spectrometer.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1289380

Alternate ID(s):: OSTI ID: 22596529

Report Number(s):: LLNL-PROC--694395

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Lineshape measurements of He- β spectra on the ORION laser facility Beiersdorfer, P.; Brown, G. V.; Shepherd, R. Physics of Plasmas, Vol. 23, Issue 10 https://doi.org/10.1063/1.4965233	journal	October 2016
High resolution, high signal-to-noise crystal spectrometer for measurements of line shifts in high-density plasmas Beiersdorfer, P.; Magee, E. W.; Brown, G. V. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5035303	journal	October 2018
Experimental comparison of spherically bent HAPG and Ge crystals Hell, N.; Lockard, T.; Beiersdorfer, P. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038003	journal	October 2018
The Warm Electron Beam Ion Trap (WEBIT): An instrument for ground calibration of space-borne x-ray spectrometers Lockard, T. E.; Magee, E. W.; Layne, D. A. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039338	journal	October 2018
High-resolution measurements of Cl 15 + line shifts in hot, solid-density plasmas Beiersdorfer, P.; Brown, G. V.; McKelvey, A. Physical Review A, Vol. 100, Issue 1 https://doi.org/10.1103/physreva.100.012511	journal	July 2019
Observation of He-like Satellite Lines of the H-like Potassium K xix Emission Weller, M. E.; Beiersdorfer, P.; Lockard, T. E. The Astrophysical Journal, Vol. 881, Issue 2 https://doi.org/10.3847/1538-4357/ab2dff	journal	August 2019

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