Imaging crystal spectrometer for high-resolution x-ray measurements on electron beam ion traps and tokamaks

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

doi:10.1063/1.4962049

Title: Imaging crystal spectrometer for high-resolution x-ray measurements on electron beam ion traps and tokamaks

Journal Article · Fri Sep 09 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4962049· OSTI ID:1411705

^[1]; Magee, E. W. ^[1];

^[2]; Brown, G. V. ^[1]

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

Here, we describe a crystal spectrometer implemented on the Livermore electron beam ion traps that employ two spherically bent quartz crystals and a cryogenically cooled back-illuminated charge-coupled device detector to measure x rays with a nominal resolving power of λ/Δλ ≥ 10 000. Its focusing properties allow us to record x rays either with the plane of dispersion perpendicular or parallel to the electron beam and, thus, to preferentially select one of the two linear x-ray polarization components. Moreover, by choice of dispersion plane and focussing conditions, we use the instrument either to image the distribution of the ions within the 2 cm long trap region, or to concentrate x rays of a given energy to a point on the detector, which optimizes the signal-to-noise ratio. We demonstrate the operation and utility of the new instrument by presenting spectra of Mo³⁴⁺, which prepares the instrument for use as a core impurity diagnostic on the NSTX-U spherical torus and other magnetic fusion devices that employ molybdenum as plasma facing components.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1411705

Report Number(s):: LLNL-JRNL-693322; RSINAK

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

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

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