Ex situ calibration of the scattered-light time-history diagnostic on the National Ignition Facility.

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-01 DOI:10.1063/5.0218987

S Kostick, T Filkins, M J Rosenberg, J Katz, W Theobald, N Lemos, E Tubman, R Sommers, J E Hernandez, G Swadling, J S Ross, P B Radha, F Grullon, J M Heinmiller, J Fornes, P Hillyard, J McCumber, L Ceurvorst, S P Regan

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Abstract

The scattered-light time-history diagnostic (SLTD) suite measures time-resolved scattered light in three wavelength bands: stimulated Brillouin scattering (350-352 nm), stimulated Raman scattering (430-760 nm), and plasma emission at half the laser frequency (695-735 nm), at 15 locations around the National Ignition Facility (NIF) target chamber. The SLTD, along with the full-aperture backscatter station (FABS), collects scattered light from direct- and indirect-drive inertial confinement fusion experiments. The SLTD calibration was revisited after a discrepancy between FABS and SLTD measurements was observed on NIF polar direct-drive [Skupsky et al., Phys. Plasmas 11, 2763 (2004)] experiments. An integrated calibration of the SLTD was performed for the first time, and individual components were also calibrated for the wavelengths of 351, 527, and 532 nm. The optical transmission of the instrument was measured to be (1.12 ± 0.04) × 10-7 and (1.96 ± 0.11) × 10-7 for the wavelengths of 351 and 532 nm, respectively. The revised calibration at 351 nm brings the SLTD measured scattered energy in agreement with the FABS measured scattered energy after additionally accounting for the degradation of an optical element in FABS. This decreased the inferred absorption by 7% for a representative experiment. However, discrepancies remain between FABS and SLTD measurements in the SRS band (532 nm).

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在国家点火装置上对散射光时间历史诊断进行现场校准。

散射光时间历程诊断（SLTD）套件在国家点火装置（NIF）靶室周围的 15 个位置测量三个波段的时间分辨散射光：受激布里渊散射（350-352 nm）、受激拉曼散射（430-760 nm）和激光频率一半处的等离子体发射（695-735 nm）。SLTD 与全孔径后向散射站 (FABS) 一起收集来自直接和间接驱动惯性约束聚变实验的散射光。在 NIF 极地直驱实验中观察到 FABS 和 SLTD 测量值之间存在差异后，重新对 SLTD 进行了校准[Skupsky 等人，Phys. Plasmas 11, 2763 (2004)]。首次对 SLTD 进行了综合校准，并对 351、527 和 532 nm 波长的单个组件进行了校准。在 351 和 532 纳米波长下，仪器的光学透射率分别为 (1.12 ± 0.04) × 10-7 和 (1.96 ± 0.11) × 10-7。在 351 nm 波长处的修订校准使 SLTD 测得的散射能量与 FABS 测得的散射能量一致，但额外考虑了 FABS 中一个光学元件的衰减。这使代表性实验的推断吸收率降低了 7%。但是，在 SRS 波段（532 nm），FABS 和 SLTD 的测量结果仍然存在差异。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.