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Song J, Zheng J, Chen Z, Chen J, Wang F. Neutron penumbral image reconstruction with a convolution neural network using fast Fourier transform. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:013509. [PMID: 38265276 DOI: 10.1063/5.0175347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 12/30/2023] [Indexed: 01/25/2024]
Abstract
In Inertial Confinement Fusion (ICF), the asymmetry of a hot spot is an important influence factor in implosion performance. Neutron penumbral imaging, which serves as an encoded-aperture imaging technique, is one of the most important diagnostic methods for detecting the shape of a hot spot. The detector image is a uniformly bright range surrounded by a penumbral area, which presents the strength distribution of hot spots. The present diagnostic modality employs an indirect imaging technique, necessitating the reconstruction process to be a pivotal aspect of the imaging protocol. The accuracy of imaging and the applicable range are significantly influenced by the reconstruction algorithm employed. We develop a neural network named Fast Fourier transform Neural Network (FFTNN) to reconstruct two-dimensional neutron emission images from the penumbral area of the detector images. The FFTNN architecture consists of 16 layers that include a FFT layer, convolution layer, fully connected layer, dropout layer, and reshape layer. Due to the limitations in experimental data, we propose a phenomenological method for describing hot spots to generate datasets for training neural networks. The reconstruction performance of the trained FFTNN is better than that of the traditional Wiener filtering and Lucy-Richardson algorithm on the simulated dataset, especially when the noise level is high as indicated by the evaluation metrics, such as mean squared error and structure similar index measure. This proposed neural network provides a new perspective, paving the way for integrating neutron imaging diagnosis into ICF.
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Affiliation(s)
- Jianjun Song
- Laser Fusion Reacher Center, China Academic of Engineering Physics, Mianyang, SiChuan 621900, China
| | - Jianhua Zheng
- Laser Fusion Reacher Center, China Academic of Engineering Physics, Mianyang, SiChuan 621900, China
| | - Zhongjing Chen
- Laser Fusion Reacher Center, China Academic of Engineering Physics, Mianyang, SiChuan 621900, China
| | - Jihui Chen
- Laser Fusion Reacher Center, China Academic of Engineering Physics, Mianyang, SiChuan 621900, China
| | - Feng Wang
- Laser Fusion Reacher Center, China Academic of Engineering Physics, Mianyang, SiChuan 621900, China
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Fittinghoff DN, Birge N, Geppert-Kleinrath V. Neutron imaging of inertial confinement fusion implosions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:021101. [PMID: 36859056 DOI: 10.1063/5.0124074] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 01/07/2023] [Indexed: 06/18/2023]
Abstract
We review experimental neutron imaging of inertial confinement fusion sources, including the neutron imaging systems that have been used in our measurements at the National Ignition Facility. These systems allow measurements with 10 µm resolution for fusion deuterium-deuterium and deuterium-tritium neutron sources with mean radius up to 400 µm, including measurements of neutrons scattered to lower energy in the remaining cold fuel. These measurements are critical for understanding the fusion burn volume and the three-dimensional effects that can reduce the neutron yields.
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Affiliation(s)
- D N Fittinghoff
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Birge
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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Adrian PJ, Frenje J, Aguirre B, Bachmann B, Birkel A, Johnson MG, Kabadi NV, Lahmann B, Li CK, Mannion OM, Martin W, Mohamed ZL, Regan SP, Rinderknecht HG, Scheiner B, Schmitt MJ, Séguin FH, Shah RC, Sio H, Sorce C, Sutcliffe GD, Petrasso RD. An x-ray penumbral imager for measurements of electron-temperature profiles in inertial confinement fusion implosions at OMEGA. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:043548. [PMID: 34243391 DOI: 10.1063/5.0041038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 04/03/2021] [Indexed: 06/13/2023]
Abstract
Hot-spot shape and electron temperature (Te) are key performance metrics used to assess the efficiency of converting shell kinetic energy into hot-spot thermal energy in inertial confinement fusion implosions. X-ray penumbral imaging offers a means to diagnose hot-spot shape and Te, where the latter can be used as a surrogate measure of the ion temperature (Ti) in sufficiently equilibrated hot spots. We have implemented a new x-ray penumbral imager on OMEGA. We demonstrate minimal line-of-sight variations in the inferred Te for a set of implosions. Furthermore, we demonstrate spatially resolved Te measurements with an average uncertainty of 10% with 6 μm spatial resolution.
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Affiliation(s)
- P J Adrian
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - J Frenje
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - B Aguirre
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - B Bachmann
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Birkel
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - M Gatu Johnson
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - N V Kabadi
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - B Lahmann
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - C K Li
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - O M Mannion
- Laboratory for Laser Energetics: University of Rochester, Rochester, New York 14623, USA
| | - W Martin
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - Z L Mohamed
- Laboratory for Laser Energetics: University of Rochester, Rochester, New York 14623, USA
| | - S P Regan
- Laboratory for Laser Energetics: University of Rochester, Rochester, New York 14623, USA
| | - H G Rinderknecht
- Laboratory for Laser Energetics: University of Rochester, Rochester, New York 14623, USA
| | - B Scheiner
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - M J Schmitt
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - F H Séguin
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - R C Shah
- Laboratory for Laser Energetics: University of Rochester, Rochester, New York 14623, USA
| | - H Sio
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Sorce
- Laboratory for Laser Energetics: University of Rochester, Rochester, New York 14623, USA
| | - G D Sutcliffe
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA
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Jia Q, Hu H, Zhang F, Liu Z, Li Z, Wu Y, Zhang T. Design, modeling and reconstruction method research of a 14.1MeV neutron imaging system suitable for low yield Z-Pinch diagnosis. ANN NUCL ENERGY 2013. [DOI: 10.1016/j.anucene.2013.05.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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