X-ray imaging in an environment with high-neutron background on National Ignition Facility

Smalyuk, V. A.; Ayers, J.; Bell, P. M.; Bourgade, J. L.; Bradley, D. K.; Celeste, J.; Cerjan, C.; Darbon, S.; Emig, J.; Felker, B.; Hagmann, C.; Holder, J. P.; Izumi, N.; Kilkenny, J. D.; Moody, J. D.; Piston, K.; Rousseau, Adrien; Sorce, C.; Tommasini, R.

doi:10.1117/12.894200

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…In systems with CCD image recorders, neutrons, protons, and alpha particles, can interact with silicon in the sensitive region, resulting in recoil ions that create tracks and "stars" in the image. The effects of these localized background events can be mitigated through image-processing techniques [17]. A more diffuse background is created by energetic electrons that deposit energy in the sensitive region through ionization energy loss [14,15].…”

Section: Effects Of Neutrons On X-ray Imagingmentioning

confidence: 99%

“…As shown in figure 4, the ARIANE imager currently being commissioned is located outside of the NIF target chamber, 7m from the target, and uses both film and electronic image recording techniques during progressive phases of deployment [17,18]. This arrangement confers several advantages: (1) the radiation field is lower as the distance to the target increases, (2) the increased distance results in a greater time difference between x-rays and neutrons at the detector, and (3) location outside the target chamber enables the use of shielding to reduce background levels.…”

Section: Arianementioning

confidence: 99%

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Advanced gated x-ray imagers for experiments at the National Ignition Facility

et al. 2011

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X-ray imaging is integral to the measurement of the properties of hot plasmas. To this end, a suite of gated x-ray imagers have been developed for use in a wide range of experiments at the National Ignition Facility (NIF). These instruments are sensitive to x-rays over the range of 0.7-90keV and can acquire images at 20ps intervals for source intensities ranging over several orders of magnitude. We review the design, technology, and construction of these instruments and present recent results obtained from NIF experiments in which gated x-ray imagers have played a key role.The radiation environment associated with Inertial Confinement Fusion (ICF) experiments presents unique challenges for x-ray imaging. We report on the performance of gated imagers that have been optimized for this harsh environment and describe diagnostics to be deployed in the near future that will provide x-ray images of imploding ICF capsules in the presence of backgrounds associated with neutron yields above 10 16 . Such images will provide crucial data that will enable even higher neutron yields and successful ignition.

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Section: Effects Of Neutrons On X-ray Imagingmentioning

confidence: 99%

Section: Arianementioning

confidence: 99%

Advanced gated x-ray imagers for experiments at the National Ignition Facility

et al. 2011

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Extracting core shape from x-ray images at the National Ignition Facility

Glenn

Benedetti

Bradley

et al. 2012

Review of Scientific Instruments

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Measuring the shape of implosions is critical to inertial confinement fusion experiments at the National Ignition Facility. We have developed techniques that have proven successful for extracting shape information from images of x-ray self-emission recorded by a variety of diagnostic instruments for both DT-filled targets and low-yield surrogates. These key results help determine optimal laser and target parameters leading to ignition. We have compensated for instrumental response and have employed a variety of image processing methods to remove artifacts from the images while retaining salient features. The implosion shape has been characterized by decomposing intensity contours into Fourier and Legendre modes for different lines of sight. We also describe procedures we have developed for estimating uncertainties in these measurements.

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Dilation x-ray imager a new/faster gated x-ray imager for the NIF

Nagel

Hilsabeck

Bell

et al. 2012

Review of Scientific Instruments

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As the yield on implosion shots increases it is expected that the peak x-ray emission reduces to a duration with a FWHM as short as 20 ps for ∼7 × 10(18) neutron yield. However, the temporal resolution of currently used gated x-ray imagers on the NIF is 40-100 ps. We discuss the benefits of the higher temporal resolution for the NIF and present performance measurements for dilation x-ray imager, which utilizes pulse-dilation technology [T. J. Hilsabeck et al., Rev. Sci. Instrum. 81, 10E317 (2010)] to achieve x-ray imaging with temporal gate times below 10 ps. The measurements were conducted using the COMET laser, which is part of the Jupiter Laser Facility at the Lawrence Livermore National Laboratory.

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X-ray imaging in an environment with high-neutron background on National Ignition Facility

Cited by 6 publications

References 9 publications

Advanced gated x-ray imagers for experiments at the National Ignition Facility

Advanced gated x-ray imagers for experiments at the National Ignition Facility

Extracting core shape from x-ray images at the National Ignition Facility

Dilation x-ray imager a new/faster gated x-ray imager for the NIF

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