Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging

Benedetti, L. R.; Holder, J. P.; Perkins, Michael P.; Brown, Charles G.; Anderson, Craig S.; Allen, F.V.; Petre, Robert; Hargrove, D.; Glenn, S.; Simanovskaia, N.; Bradley, D. K.; Bell, P. M.

doi:10.1063/1.4941754

Cited by 61 publications

(6 citation statements)

References 26 publications

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“…Regardless of these potential improvements, the level of resolution obtained here is already comparable to the resolution of other x-ray imaging diagnostics fielded at high-repetition-rate facilities, such as gated x-ray framing cameras [40], point-source radiography [41], and pinhole imagers [42]. However, because this diagnostic relies on phase-contrast techniques rather than absorption, it is able to observe regimes that would generally be undetectable to standard diagnostics without the large distances required for other phase-contrast diagnostics [6].…”

Section: Use For High-repetition-rate Facilities a Resolution Of Recmentioning

confidence: 68%

Proof-of-concept Talbot–Lau x-ray interferometry with a high-intensity, high-repetition-rate, laser-driven K-alpha source

Bouffetier¹,

Ceurvorst²,

Valdivia³

et al. 2020

Appl. Opt.

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Talbot-Lau x-ray interferometry is a grating-based phase-contrast technique, which enables measurement of refractive index changes in matter with micrometric spatial resolution. The technique has been established using a variety of hard x-ray sources, including synchrotron, free-electron lasers, and x-ray tubes, and could be used in the optical range for low-density plasmas. The tremendous development of table-top high-power lasers makes the use of high-intensity, laser-driven K-alpha sources appealing for Talbot-Lau interferometer applications in both high-energy-density plasma experiments and biological imaging. To this end, we present the first, to the best of our knowledge, feasibility study of Talbot-Lau phase-contrast imaging using a high-repetition-rate laser of moderate energy (100 mJ at a repetition rate of 10 Hz) to irradiate a copper backlighter foil. The results from up to 900 laser pulses were integrated to form interferometric images. A constant fringe contrast of 20% is demonstrated over 100 accumulations, while the signal-to-noise ratio continued to increase with the number of shots. Phase retrieval is demonstrated without prior ex-situ phase stepping. Instead, correlation matrices are used to compensate for the displacement between reference acquisition and the probing of a PMMA target rod. The steps for improved measurements with more energetic laser systems are discussed. The final results are in good agreement with the theoretically predicted outcomes, demonstrating the applicability of this diagnostic to a range of laser facilities for use across several disciplines.

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Section: Use For High-repetition-rate Facilities a Resolution Of Recmentioning

confidence: 68%

Proof-of-concept Talbot–Lau x-ray interferometry with a high-intensity, high-repetition-rate, laser-driven K-alpha source

Bouffetier¹,

Ceurvorst²,

Valdivia³

et al. 2020

Appl. Opt.

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“…The gain uniformity is also one of the most important parameters. It could be used to get better quantitative precision for the x-ray image in the ICF experiment [24], [25]. The gain uniformity of the detector is tested, and the results show that the gain is dropped 1.7× along the pulse transmitting direction.…”

Section: Discussionmentioning

confidence: 99%

Ultrafast X-Ray Detector and its Gain Uniformity

Cai

Deng

et al. 2019

IEEE Access

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An ultrafast x-ray detector consisted of an electron pulse time-dilation device, a combined electromagnetic lens system, a microchannel plate (MCP) gated imager, and an electrical pulse generator is reported. The time-dilation device is used to magnify the temporal width of the electron beam created from the photo-cathode (PC), and then the combined electromagnetic lens system images the dilated electron beam onto the MCP. Finally, the MCP imager samples the dilated electron signal and outputs corresponding visible light. A measured temporal resolution of 80 ps for the detector is achieved while the electron pulse is not dilated. The resolution is improved to 12 ps while an excitation pulse with 3.1 V/ps rising edge gradient is used to drive the PC to dilate the electron pulse. Moreover, the gain uniformity of the detector is also tested, which shows the gain is decreased gradually with the excitation pulse propagating on the PC and the drop in gain is about 1.7 ×.

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“…The gain index of the MCP depends on the operating voltage. A slightly change in the gate pulse voltage on the microstrip line will cause a great gain change in the MCP [17,18].…”

Section: Jinst 16 P06007mentioning

confidence: 99%

Proximity-gated X-ray framing camera with gain uniformity

Long

Cai

et al. 2021

J. Inst.

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A novel proximity gated microchannel plate (MCP) framing camera has been designed and tested. The camera system consists of two basic components with a traveling wave microstrip photocathode gated proximity focusing X-ray image tube framing and electrical control system. The voltage of the phosphor screen, the strobe pulse of the MCP and the bias voltage of the MCP are all provided by the electronic control unit. The photocathode of image-converted tube consists of Au.Four line cathodes with a width of 12 mm and an interval of 4 mm are deposited onto the illuminated side of MCP. The camera's temporal record length is ∼1.5 ns. When the cathode is applied by a pulse with full width at half maximum of 190 ps and amplitude of -2.5 kV with -100 V bias, the temporal resolution is measured to be ∼62 ps. The gain uniformity of the cathode was characterized using a short X-ray pulse produced by a laser beam focused on a copper target. The results show that the MCP gain decreases by about 28% along the pulse direction, while the gain change perpendicular to the strip direction is within 5%.

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Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging

Cited by 61 publications

References 26 publications

Proof-of-concept Talbot–Lau x-ray interferometry with a high-intensity, high-repetition-rate, laser-driven K-alpha source

Proof-of-concept Talbot–Lau x-ray interferometry with a high-intensity, high-repetition-rate, laser-driven K-alpha source

Ultrafast X-Ray Detector and its Gain Uniformity

Proximity-gated X-ray framing camera with gain uniformity

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