Three-dimensional α-particle imaging of laser-driven implosions

Fews, AP; Lamb, Martin; Savage, M.

doi:10.1017/s0263034600007187

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…Penumbral imaging [1] is powerful technique for neutron imaging or other penetrating radiations [2,3]. The technique uses facts that spatial information can be recovered from the shadow or penumbra that an unknown source casts through a simple large circular aperture.…”

Section: Introductionmentioning

confidence: 99%

Fast and Robust Reconstruction of Penumbral Images by Combining Multiple Wiener Filters

Nozaki

Azuma

Fujioka

et al. 2011

Plasma and Fusion Research

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Penumbral imaging is a powerful technique for imaging with penetrating radiation such as neutrons and hard x rays. The reconstructed image can be obtained by the deconvolution of the detected image. Usually a Wiener filter is used for the reconstruction. The limitation of the Wiener filter is that it will introduce a significant distortion when the detected image contains noise. On the other hand, heuristic methods can obtain clear reconstructed image from noisy penumbral images. However, it significantly takes computation time. We proposed a new reconstruction method in the penumbral imaging to obtain clear reconstructed image by combining the multiple Wiener filters and the method can reduce computation time. The effectiveness of the proposed method has been demonstrated by computer simulation and real laser plasma experiment.

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Section: Introductionmentioning

confidence: 99%

Fast and Robust Reconstruction of Penumbral Images by Combining Multiple Wiener Filters

Nozaki

Azuma

Fujioka

et al. 2011

Plasma and Fusion Research

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show abstract

“…This approach has been used in imaging with DD protons and DT ␣ particles. [38][39][40][41] Section III describes a different direct, noniterative algorithum involving computation in the spatial domain only. It is computationally efficient, has no issues with filter singularities, and has a well-defined point-response function that allows calculation of simple and explicit scaling laws relating camera parameters and source type to the spatial resolution and signal-to-noise ratio of reconstructed source functions.…”

Section: Introductionmentioning

confidence: 99%

D 3 He -proton emission imaging for inertial-confinement-fusion experiments (invited)

Séguin

Deciantis

Frenje

et al. 2004

Review of Scientific Instruments

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Proton emission imaging cameras, in combination with proton spectrometers and a proton temporal diagnostic, provide a great deal of information about the spatial structure and time evolution of inertial-confinement fusion capsule implosions. When used with D 3 He-filled capsules, multiple proton emission imaging cameras measure the spatial distribution of fusion burn, with three-dimensional information about burn symmetry. Simultaneously, multiple spectrometers measure areal density as a function of angle around the imploded capsule. Experiments at the OMEGA laser facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] have already proven the utility of this approach. An introduction to the hardware used for penumbral imaging, and algorithms used to create images of the burn region, are provided here along with simple scaling laws relating image resolution and signal-to-noise ratio to characteristics of the cameras and the burn region.

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“…1 Since such an aperture can be "drilled" through a substrate of almost any thickness, the technique can be easily applied to highly penetrating radiation such as neutrons and ␥ rays. To date, the penumbral imaging technique has been successfully applied to image the high-energy x rays, 1,2 ␣ particle, 3 protons, 4 and neutrons [5][6][7][8] in laser fusion experiments. The basic concept of the penumbral imaging technique is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Coded penumbral imaging for improvements of signal-to-noise ratio

Chen

Yamamoto

Nozaki

2004

Review of Scientific Instruments

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Penumbral imaging is a power imaging technique for radiations with long mean-free path. Since the reconstruction is based on deconvolution, the technique is sensitive to noise contained in penumbral images. In this article, we proposed a uniformly redundant penumbral array (URPA) technique to improve the signal-to-noise (SN) ratio of penumbral images. In URPA, the penumbral apertures are arranged in m-sequence and the SN ratio of the penumbral image can be improved by a factor of ͓͑r ϫ s +1͒ /2͔ 1/2 , where r ϫ s is the size of two-dimensional m sequence. The effectiveness of URPA has been demonstrated by computer simulations.

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Three-dimensional α-particle imaging of laser-driven implosions

Cited by 11 publications

References 11 publications

Fast and Robust Reconstruction of Penumbral Images by Combining Multiple Wiener Filters

Fast and Robust Reconstruction of Penumbral Images by Combining Multiple Wiener Filters

D 3 He -proton emission imaging for inertial-confinement-fusion experiments (invited)

Coded penumbral imaging for improvements of signal-to-noise ratio

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