Abstract
Charged particle diagnostics is one of the required techniques for implosion areal density diagnostics at the SG-III facility. Several proton spectrometers are under development, and some preliminary areal density diagnostics have been carried out. The response of the key detector, CR39, to charged particles was investigated in detail. A new track profile simulation code based on a semi-empirical model was developed. The energy response of the CR39 detector was calibrated with the accelerator protons and alphas from a 241Am source. A proton spectrometer based on the filtered CR39 detector was developed, and D–D primary proton measurements were implemented. A step range filter spectrometer was developed, and preliminary areal density diagnostics was carried out. A wedged range filter spectrometer array made of Si with a higher resolution was designed and developed at the SG-III facility. A particle response simulation code by the Monte Carlo method and a spectra unfolding code were developed. The capability was evaluated in detail by simulations.
Highlights
The SG-III facility has 48 laser beams with a maximum output energy of 180 kJ
Three kinds of CR39-based proton spectrometers were applied at the SG-III facility for inertial confinement fusion (ICF) implosion areal density diagnostics
The energy response of the CR39 detector to charged particles was studied by simulations and experiments
Summary
D–3He implosion can be diagnosed by the different energy downshifts at the shock bang time and compression bang time[6, 7]. Through ρR measurements at multiple view angles by several proton spectrometers, the compression asymmetry can be diagnosed[4]. The first two are compact spectrometers with high detection efficiencies and perform well in D–3He reaction proton measurement. A new track profile simulation code is presented, as well as an experimental study of the energy response.
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