Model Validation for Quantitative X-Ray Measurements

Reusch, L. M.; Franz, P.; Hartog, D. J. Den; Goetz, J. A.; Nornberg, M. D.; Vanmeter, Patrick

doi:10.1080/15361055.2017.1404340

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…While the tomography system is typically operated in this two-color mode, the filter configuration is flexible, and, for example, 8 different thickness filters can be used for increased spectral information. 32 This diagnostic has been absolutely calibrated, which makes comparisons to models of absolute brightness feasible. This includes bench tests to determine the exact amplification factor provided by the transimpedance amplifiers for frequencies between 1 and 100 kHz; calibration of the beryllium filter transmission using the BESSY II electron storage ring for photon energies between 1.8 and 10 keV; 33 accounting of all geometric effects such as non-normal incidence of photons; and accounting for the presence of an aluminum frame on the silicon detectors, which can change the spectral response of the detector.…”

Section: Ida Measurement Of Z Eff On Mstmentioning

confidence: 99%

“…However, we recently used ADAS to predict SXR signals in multiple energy ranges (different filters) with differing amounts of bremsstrahlung, radiative and dielectronic recombination, and line radiation, with excellent agreement to experimental data. 32 Filter, amplifier, and detector calibrations have been taken into account in the SXR forward model.…”

Section: Ida Measurement Of Z Eff On Mstmentioning

confidence: 99%

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Using integrated data analysis to extend measurement capability (invited)

Reusch

Nornberg

Goetz

et al. 2018

Review of Scientific Instruments

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The analysis approach called integrated data analysis (IDA) provides a means to exploit all information present in multiple streams of raw data to produce the best inference of a plasma parameter. This contrasts with the typical approach in which information (data) from a single diagnostic is used to measure a given parameter, e.g., visible bremsstrahlung → Z eff. Data from a given diagnostic usually contain information on many parameters. For example, a Thomson scattering diagnostic is sensitive to bremsstrahlung and line emission in addition to electron temperature. This background light is typically subtracted off and discarded but could be used to improve knowledge of Z eff. IDA encourages explicit awareness of such information and provides the quantitative framework to exploit it. This gives IDA the ability to increase spatial and temporal resolution, increase precision and accuracy of inferences, and measure plasma parameters that are difficult or impossible to measure using single diagnostic techniques. One example is the measurement of Z eff on Madison symmetric torus using IDA since no single diagnostic can provide a robust measurement. As we enter the burning plasma era, application of IDA will be critical to the measurement of certain parameters, as diagnostic access in the harsh fusion environment will be extremely limited.

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Section: Ida Measurement Of Z Eff On Mstmentioning

confidence: 99%

Section: Ida Measurement Of Z Eff On Mstmentioning

confidence: 99%

Using integrated data analysis to extend measurement capability (invited)

Reusch

Nornberg

Goetz

et al. 2018

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

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Robust analysis of space-, time-, and energy-resolved soft x-ray measurements of magnetically confined fusion plasmas (invited)

Vanmeter

Delgado‐Aparicio

Reusch

et al. 2021

Review of Scientific Instruments

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A novel compact multi-energy soft x-ray (ME-SXR) diagnostic based on the PILATUS3 100K x-ray detector has been developed in collaboration between the Princeton Plasma Physics Laboratory and the University of Wisconsin-Madison and tested on the Madison Symmetric Torus (MST) reversed-field pinch. This solid-state photon-counting detector consists of a two-dimensional array of ∼100 000 pixels for which the lower photon absorption cutoff energy can be independently set, allowing it to be configured for a unique combination of simultaneous spatial, spectral, and temporal resolution of ∼1 cm, 100 eV, and 500 Hz, respectively. The diagnostic is highly versatile and can be readily adapted to diverse plasma operating conditions and scientific needs without any required downtime. New results from improved-confinement and quasi-single helicity plasmas in the MST demonstrate how the detector can be applied to study multiple aspects of the evolution of magnetically confined fusion-grade plasmas. These include observing the evolution of thermal emissivity, characterizing the energy of mid-Z excitation lines, extracting the Te profile, and observing the evolution of non-thermal populations. A technique for integrating the ME-SXR diagnostic into an integrated data analysis framework based on Bayesian inference is also presented. This allows ME-SXR measurements to be combined with data for complementary diagnostics in order to simultaneously infer Te and nZ from all available information.

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Model Validation for Quantitative X-Ray Measurements

Cited by 2 publications

References 32 publications

Using integrated data analysis to extend measurement capability (invited)

Using integrated data analysis to extend measurement capability (invited)

Robust analysis of space-, time-, and energy-resolved soft x-ray measurements of magnetically confined fusion plasmas (invited)

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