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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
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Development of an ultra-fast photomultiplier tube for gamma-ray Cherenkov detectors at the National Ignition Facility (PD-PMT)
摘要： A new ultra-fast photomultiplier tube and associated drivers have been developed for use in the next generation of gamma-ray high pressure gas Cherenkov detectors for inertial con?nement fusion experiments at the National Ignition Facility. Pulse-dilation technology has been applied to a standard micro-channel-plate-based photomultiplier tube to improve the temporal response by about 10×. The tube has been packaged suitably for deployment on the National Ignition Facility, and remote electronics have been designed to deliver the required non-linear waveforms to the pulse dilation electrode. This is achieved with an avalanche pulse generator system capable of generating fast arbitrary waveforms over the useful parameter space. The pulse is delivered via fast impedance-matching transformers and isolators, allowing the cathode to be ramped on a sub-nanosecond time scale between two high voltages in a controlled non-linear manner. This results in near linear pulse dilation over several ns. The device has a built-in ?ducial system that allows easy calibration and testing with ?ber optic laser sources. Results are presented demonstrating the greatly improved response time and other parameters of the device.
关键词： inertial con?nement fusion,gamma-ray Cherenkov detectors,National Ignition Facility,ultra-fast photomultiplier tube,pulse-dilation technology
更新于2025-09-09 09:28:46