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oe1(光电查) - 科学论文

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  • Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility

    摘要： Fusion reaction history and ablator areal density measurements for Inertial Con?nement Fusion experiments at the National Ignition Facility are currently conducted using the Gamma Reaction History diagnostic (GRH 6m). Future Gas Cherenkov Detectors (GCDs) will ultimately provide ～100x more sensitivity, reduce the effective temporal response from ～100 to ～10 ps, and lower the energy threshold from 2.9 to 1.8 MeV, relative to GRH 6m. The ?rst phase toward next generation GCDs consisted of inserting the existing coaxial GCD-3 detector into a reentrant well which puts it within 4 m of the implosion. Reaction history and ablator gamma measurement results from this Phase I are discussed here. These results demonstrate viability for the follow-on Phases of (II) the use of a revolutionary new pulse-dilation photomultiplier tube to improve the effective measurement bandwidth by >10x relative to current PMT technology; and (III) the design of a NIF-speci?c “Super” GCD which will be informed by the assessment of the radiation background environment within the well described here.

    关键词： pulse-dilation photomultiplier tube,Gas Cherenkov Detectors,Gamma-ray Cherenkov detectors,Inertial Con?nement Fusion,National Ignition Facility

    更新于2025-09-10 09:29:36

  • Pulse dilation gas Cherenkov detector for ultra-fast gamma reaction history at the NIF (invited)

    摘要： The Cherenkov mechanism used in Gas Cherenkov Detectors (GCDs) is exceptionally fast. However, the temporal resolution of GCDs, such as the Gamma Reaction History diagnostic at the National Ignition Facility (NIF), has been limited by the current state-of-the-art photomultiplier tube technology to ～100 ps. The soon-to-be deployed Pulse Dilation Photomultiplier Tube (PD-PMT) at NIF will allow for temporal resolution comparable to that of the gas cell or ～10 ps. Enhanced resolution will contribute to the quest for ignition in a crucial way through precision measurements of reaction history and ablator areal density (ρR) history, leading to better constrained models. Features such as onset of alpha heating, shock reverberations, and burn truncation due to dynamically evolving failure modes may become visible for the ?rst time. Test measurements of the PD-PMT at Atomic Weapons Establishment con?rmed that design goals have been met. The PD-PMT provides dilation factors of 2 to 40× in 6 increments. The GCD-3 recently deployed at the NIF has been modi?ed for coupling to a PD-PMT and will soon be making ultrafast measurements.

    关键词： Gas Cherenkov Detectors,Pulse Dilation Photomultiplier Tube,National Ignition Facility,temporal resolution,Cherenkov mechanism

    更新于2025-09-09 09:28:46