Strip velocity measurements for gated x-ray imagers using short pulse lasers

P. W. Ross; M. Cardenas; M. Griffin; A. Mead; C. T. Silbernagel; P. Bell; S. Haque

doi:10.1117/12.2027519

26 September 2013 Strip velocity measurements for gated x-ray imagers using short pulse lasers

P. W. Ross, M. Cardenas, M. Griffin, A. Mead, C. T. Silbernagel, P. Bell, S. Haque

Proceedings Volume 8850, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion II; 88500L (2013) https://doi.org/10.1117/12.2027519
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Strip velocity measurements of gated X-ray imagers are presented using an ultra-short pulse laser. Obtaining time- resolved X-ray images of inertial confinement fusion shots presents a difficult challenge. One diagnostic developed to address this challenge is the gated X-ray imagers. The gated X-ray detectors (GXDs) developed by Lawrence Livermore National Laboratory and Los Alamos National Laboratory use a microchannel plate (MCP) coated with a gold strip line, which serves as a photocathode. GXDs are used with an array of pinholes, which image onto various parts of the GXD image plane. As the pulse sweeps over the strip lines, it creates a time history of the event with consecutive images. In order to accurately interpret the timing of the images obtained using the GXDs, it is necessary to measure the propagation of the pulse over the strip line. The strip velocity was measured using a short pulse laser with a pulse duration of approximately 1-2 ps. The 200nm light from the laser is used to illuminate the GXD MCP. The laser pulse is split and a retroreflective mirror is used to delay one of the legs. By adjusting the distance to the mirror, one leg is temporally delayed compared to the reference leg. The retroreflective setup is calibrated using a streak camera with a 1 ns full sweep. Resolution of 0.5 mm is accomplished to achieve a temporal resolution of ~5 ps on the GXD strip line.

Citation Download Citation

P. W. Ross, M. Cardenas, M. Griffin, A. Mead, C. T. Silbernagel, P. Bell, and S. Haque "Strip velocity measurements for gated x-ray imagers using short pulse lasers", Proc. SPIE 8850, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion II, 88500L (26 September 2013); https://doi.org/10.1117/12.2027519

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KEYWORDS

Microchannel plates

Mirrors

Velocity measurements

Pulsed laser operation

Picosecond phenomena

Streak cameras

X-ray imaging

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