High-resolution spectroscopy of K-shell praseodymium with a high-energy microcalorimeter

Thorn, D. B.; Brown, G. V.; Clementson, J.; Chen, H; Chen, M; Beiersdörfer, P.; Boyce, K. R.; Kilbourne, Caroline A.; Porter, F. S.; Kelley, R. L.

doi:10.1139/p07-134

Cited by 25 publications

(14 citation statements)

References 19 publications

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“…In particular, we report measurements of the DR satellite transitions and their parent resonance lines of Fe XXV and Fe XXVI. Earlier measurements of the K-shell X-ray emission of highly charged ions conducted with the microcalorirneter on EBIT-I have been limited to lines" produced by electron-impact excitation [25][26][27][28][29], measurements of the associated X-ray polarization [30], and lines produced by charge exchange [31][32][33][34]. The present measurements were obtained with a thermal plasma sinnulation technique implemented on EBIT-I.…”

Section: Introductionmentioning

confidence: 99%

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Beiersdörfer

Brown

et al. 2012

Can. J. Phys.

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We present laboratory spectra of dielectronic recombination (DR) satellite tnmsitions attached to the He-like and H-like iron resonance lines obtained widt me NASA Goddard Space Flight Center X-ray calorimeter and produced by a thermal plasma simu1ation technique on the EBIT-I electron beam ion trap at the Lawrence Livennore National Laboratory. We demonstrate that the ca10rimeter has sufficient spectral resoiution in the 6-9 keY range to provide reliable measurements not only of standard DR satellite to resonance line intensities but also of DR satellite to DR satellite ratios that can be used to diagnose nonthermal electron distributions. Electron temperatures derived from the measured line intensities are consistent with the temperature of the simulated plasma. Temperature measurements based on DR satellite transitions have significant advantages over those based on collisional ionization equilibrium or continuum shape. Thus, successful demonstration of this method with the X-ray calorimeter is an important step fur its application in X-ray astronomy.

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Section: Introductionmentioning

confidence: 99%

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Beiersdörfer

Brown

et al. 2012

Can. J. Phys.

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“…Both microcalorimeter arrays have produced outstanding X-ray reference data for astrophysics [1,51,52]. Other applications include high-resolution spectroscopy of xenon [53] and praseodymium [54] for QED tests, spectroscopy on tungsten for fusion research [55] and the investigation of X-ray transitions in thorium-229 for the development of an atomic clock [56]. The astrophysics experiments were mostly focused on X-ray energies below 5 keV, while the measurements for xenon [53], praseodymium [54] and thorium [56] were centered around 30-40 keV.…”

Section: Working Principle Of Resistance Thermometersmentioning

confidence: 99%

Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

Kraft‐Bermuth

Hengstler

Egelhof

et al. 2018

Atoms

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X-ray spectroscopy of highly charged heavy ions is an important tool for the investigation of many topics in atomic physics. Such highly charged ions, in particular hydrogen-like uranium, are investigated at heavy ion storage rings, where high charge states can be produced in large quantities, stored for long times and cooled to low momentum spread of the ion beam. One prominent example is the determination of the 1s Lamb Shift in hydrogen-like heavy ions, which has been investigated at the Experimental Storage Ring (ESR) at the GSI Helmholtz Centre for Heavy Ion Research. Due to the large electron binding energies, the energies of the corresponding photon transitions are located in the X-ray regime. To determine the transition energies with high accuracy, highly resolving X-ray spectrometers are needed. One concept of such spectrometers is the concept of microcalorimeters, which, in contrast to semiconductor detectors, uses the detection of heat rather than charge to detect energy. Such detectors have been developed and successfully applied in experiments at the ESR. For experiments at the Facility for Antiproton and Ion Research (FAIR), the Stored Particles and Atoms Collaboration (SPARC) pursues the development of new microcalorimeter concepts and larger detector arrays. Next to fundamental investigations on quantum electrodynamics such as the 1s Lamb Shift or electron–electron interactions in two- and three-electron systems, X-ray spectroscopy may be extended towards nuclear physics investigations like the determination of nuclear charge radii.

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“…3 there are ongoing developments in microcalorimeters [16,17] and energy-resolving active pixel array [18,19] technologies.…”

Section: Instrumentation and Broadband Emission-based Diagnosticsmentioning

confidence: 99%

Anticipated X-ray and VUV spectroscopic data from ITERwith appropriate diagnostic instrumentation

Peacock¹,

O’Mullane²,

Barnsley³

et al. 2008

Can. J. Phys.

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The radiation characteristics of anticipated sample elements, from H through W, in the International Thermonuclear Experimental Reactor (ITER) have been modelled using the diffusion equilibrium model SANCO for the ion concentrations coupled with the spectral signature of the ions, throughout the X-ray and VUV regions (0.1-100 keV), using the Atomic Data and Analysis Structure population code and database, ADAS. The spectral signature varies greatly depending on whether the viewing line-of-sight (LOS) encompasses the divertor and (or) core regions of the plasma volume. Bound-bound transitions required for line profile analyses of nonfuel core ions can locally dominate the continuum spectrum in the 0.1-10 keV region at acceptably low elemental concentrations. While the background continuum is the main source of noise in the line profile analyses, the intensity and features of the continuum when divided into many spectral bands covering 0.1-100 keV are themselves powerful diagnostics of the plasma composition, Z eff and the electron temperature. The spectral signature of the divertor LOSs where 1 < T e < 300 eV is dominated typically and exclusively by lines in the XUV-VUV region, restricted in the case of W to λ > 40 Å. Appropriate instrumentation, relying on imaging Bragg reflectors and diffractors and position-sensitive energy-resolving detectors, is designed to cover the full spatial extent of the core plasma. Estimates of the core signal/noise based on experience with tritium experiments on the Joint European Torus indicates substantial signal levels with tolerable neutron-induced noise and component degradation. The divertor diagnostics make use of a suite of aspheric diffraction grating spectrometers designed to measure impurity ion influxes and are essential for plasma control. The EBIT could be conceived as a neutron-free adjunct facility to the ITER spectroscopic programme. At its simplest level, it provides standards for instrument performance and for the spectroscopic signature of selected ions subjected to electronic and atomic collisions over a wide range of ITER-relevant impacting energies.Résumé : Les caractéristiques anticipées dans ITER d'échantillons allant de H à W ont été modélisées à l'aide du modèle d'équilibre de diffusion SANCO pour les concentrations ioniques, couplé à la signature spectrale des ions, sur l'ensemble des domaines X et VUV (0.1-100 keV), en utilisant le programme de population et la banque de données ADAS. La signature spectrale varie beaucoup, selon que la ligne de visée (LOS) comprend l'écorceur et/ou le coeur du volume de plasma. Les transitions entre états liés, requises pour l'analyse du profil de raie des ions non combustibles du coeur, peuvent dominer largement le spectre continu dans le domaine 0.1-10 keV aux faibles concentrations acceptables des éléments. Alors que le continu du fond est la principale source de bruit dans l'analyse du profil de raie, l'intensité et les caractéristiques du continuum lorsque divisé en plusieurs bandes spectrales couvrant 0.1-100 keV, ...

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High-resolution spectroscopy of K-shell praseodymium with a high-energy microcalorimeter

Cited by 25 publications

References 19 publications

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

Anticipated X-ray and VUV spectroscopic data from ITERwith appropriate diagnostic instrumentation

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