Monte Carlo simulation of neutron noise effects on beam position determination at the National Ignition Facility

Abdul A. S. Awwal; Richard R. Leach Jr.; Philip Datte; Anastacia Manuel

doi:10.1117/12.2026455

26 September 2013 Monte Carlo simulation of neutron noise effects on beam position determination at the National Ignition Facility

Abdul A. S. Awwal, Richard R. Leach Jr., Philip Datte, Anastacia Manuel

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Proceedings Volume 8855, Optics and Photonics for Information Processing VII; 88550L (2013) https://doi.org/10.1117/12.2026455
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Images obtained through charged coupled device (CCD) cameras in the National Ignition Facility (NIF) are crucial to precise alignment of the 192 laser beams to the NIF target-chamber center (TCC). Cameras in and around the target chamber are increasingly exposed to the effects of neutron radiation as the laser power is increased for high energy fusion experiments. NIF was carefully designed to operate under these conditions. The present work examines the degradation of the measured TCC camera position accuracy resulting from the effects of neutron radiation on the sensor and verifies operation within design specifications. Both synthetic and real beam images are used for measuring position degradation. Monte Carlo simulations based on camera performance models are used to create images with added neutron noise. These models predict neutron induced camera noise based on exposure estimates of the cumulative single-shot fluence in the NIF environment. The neutron induced noise images are used to measure beam positions on a target calculated from the alignment images with the added noise. The effects of this noise are also determined using noise artifacts from real camera images viewing TCC to estimate beam position uncertainty.

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Abdul A. S. Awwal, Richard R. Leach Jr., Philip Datte, and Anastacia Manuel "Monte Carlo simulation of neutron noise effects on beam position determination at the National Ignition Facility", Proc. SPIE 8855, Optics and Photonics for Information Processing VII, 88550L (26 September 2013); https://doi.org/10.1117/12.2026455

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KEYWORDS

Cameras

National Ignition Facility

Monte Carlo methods

Photomasks

Radiation effects

Detection and tracking algorithms

Sensors

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