Implementation of a 1-2 keV point-projection x-ray spectrometer on the National Ignition Facility
| العنوان: | Implementation of a 1-2 keV point-projection x-ray spectrometer on the National Ignition Facility |
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| المؤلفون: | John Kline, F. E. Lopez, N. B. Thompson, T. S. Perry, Evan Dodd, T. N. Archuleta, Duane A. Liedahl, Heather Johns, Y. P. Opachich, R. A. Knight, M. F. Ahmed, Marilyn Schneider, Kirk Flippo, Robert Heeter, J. A. King, E. J. Huffman |
| المصدر: | Review of Scientific Instruments. 89:10F101 |
| بيانات النشر: | AIP Publishing, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | X-ray spectroscopy, Materials science, Spectrometer, Opacity, business.industry, Detector, chemistry.chemical_element, Plasma, 01 natural sciences, 010305 fluids & plasmas, Rubidium, Optics, chemistry, 0103 physical sciences, Plasma diagnostics, 010306 general physics, National Ignition Facility, business, Instrumentation |
| الوصف: | A point-projection soft X-ray Opacity Spectrometer (OpSpec) has been implemented to measure X-ray spectra from ∼1 to 2 keV on the National Ignition Facility (NIF). Measurement of such soft X-rays with open-aperture point-projection detectors is challenging because only very thin filters may be used to shield the detector from the hostile environment. OpSpec diffracts X-rays from 540 to 2100 eV off a potassium (or rubidium) acid phthalate (KAP or RbAP) crystal onto either image plates or, most recently, X-ray films. A “sacrificial front filter” strategy is used to prevent crystal damage, while 2 or 3 rear filters protect the data. Since May 2017, OpSpec has been recording X-ray transmission data for iron-magnesium plasmas on the NIF, at “Anchor 1” plasma conditions (temperature ∼150 eV, density ∼7 × 1021 e−/cm3). Upgrades improved OpSpec’s performance on 6 NIF shots in August and December 2017, with reduced backgrounds and 100% data return using filter stacks as thin as 2.9 μm (total). Photometric noise is beginning to meet requirements, and further work will reduce systematic errors.A point-projection soft X-ray Opacity Spectrometer (OpSpec) has been implemented to measure X-ray spectra from ∼1 to 2 keV on the National Ignition Facility (NIF). Measurement of such soft X-rays with open-aperture point-projection detectors is challenging because only very thin filters may be used to shield the detector from the hostile environment. OpSpec diffracts X-rays from 540 to 2100 eV off a potassium (or rubidium) acid phthalate (KAP or RbAP) crystal onto either image plates or, most recently, X-ray films. A “sacrificial front filter” strategy is used to prevent crystal damage, while 2 or 3 rear filters protect the data. Since May 2017, OpSpec has been recording X-ray transmission data for iron-magnesium plasmas on the NIF, at “Anchor 1” plasma conditions (temperature ∼150 eV, density ∼7 × 1021 e−/cm3). Upgrades improved OpSpec’s performance on 6 NIF shots in August and December 2017, with reduced backgrounds and 100% data return using filter stacks as thin as 2.9 μm (total). Photometric noise is... |
| تدمد: | 1089-7623 0034-6748 |
| DOI: | 10.1063/1.5038092 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::421b83dabe790bea9e5e1ed378f4cc4a https://doi.org/10.1063/1.5038092 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....421b83dabe790bea9e5e1ed378f4cc4a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10897623 00346748 |
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| DOI: | 10.1063/1.5038092 |