Mr. Richard A. Zacharias Profile

Richard A. Zacharias

Group Leader at Lawrence Livermore National Lab

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Author

Publications (12)

Proceedings Article | 25 September 2014 Paper

Demonstration of enhanced DQE with a dual MCP configuration

N. Izumi, G. Hall, A. Carpenter, F. Allen, J. Cruz, B. Felker, D. Hargrove, J. Holder, J. Kilkenny, A. Lumbard, R. Montesanti, N. Palmer, K. Piston, G. Stone, M. Thao, R. Vern, R. Zacharias, O. Landen, R. Tommasini, D. Bradley, P. Bell

Proceedings Volume 9211, 921102 (2014) https://doi.org/10.1117/12.2063304

KEYWORDS: Microchannel plates, X-rays, Quantum efficiency, Photons, Sensors, Fusion energy, Radiography, Signal to noise ratio, Cameras, X-ray detectors

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Proceedings Article | 10 September 2014 Paper

Engineering architecture of the neutron Time-of-Flight (nToF) diagnostic suite at the National Ignition Facility

T. Clancy, J. Caggiano, J. McNaney, M. Eckart, M. Moran, V. Glebov, J. Knauer, R. Hatarik, S. Friedrich, R. Zacharias, A. Carpenter, M. Shoup, T. Buczek, M. Yeoman, Z. Zeid, N. Zaitseva, B. Talison, J. Worden, B. Rice, T. Duffy, A. Pruyne, K. Marshall

Proceedings Volume 9211, 92110A (2014) https://doi.org/10.1117/12.2062329

KEYWORDS: Sensors, Diagnostics, National Ignition Facility, Scintillators, Collimation, X-rays, Signal detection, Connectors, Oscilloscopes, Collimators

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SPIE Journal Paper | 1 December 2004

Alignment and wavefront control systems of the National Ignition Facility

Richard Zacharias, Neil Beer, Erlan Bliss, Scott Burkhart, Simon Cohen, Steven Sutton, R. Van Atta, Scott Winters, Joseph Thaddeus Salmon, Milton Latta, Christopher Stolz, David Pigg, Timothy Arnold

OE, Vol. 43, Issue 12, (December 2004) https://doi.org/10.1117/12.10.1117/1.1815331

KEYWORDS: Wavefronts, National Ignition Facility, Control systems, Sensors, Mirrors, Actuators, Optical amplifiers, Optical alignment, Optical engineering

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Proceedings Article | 28 May 2004 Paper

National Ignition Facility alignment and wavefront control

Richard Zacharias, Neil Beer, Erlan Bliss, Scott Burkhart, Simon Cohen, Steven Sutton, R. Van Atta, Scott Winters, Joseph Salmon, Christopher Stolz, David Pigg, Timothy Arnold

Proceedings Volume 5341, (2004) https://doi.org/10.1117/12.538469

KEYWORDS: Wavefronts, National Ignition Facility, Control systems, Sensors, Actuators, Mirrors, Optical amplifiers, Reticles, Laser systems engineering, Deformable mirrors

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Proceedings Article | 3 April 2000 Paper

Wavefront control of high-power laser beams in the National Ignition Facility (NIF)

Richard Zacharias, Erlan Bliss, Scott Winters, Richard Sacks, Mark Feldman, Andrew Grey, Jeffrey Koch, Christopher Stolz, John Toeppen, Lewis Van Atta, Bruce Woods

Proceedings Volume 3889, (2000) https://doi.org/10.1117/12.380902

KEYWORDS: Wavefronts, National Ignition Facility, Control systems, Actuators, Sensors, Mirrors, High power lasers, Computing systems, Coating, Deformable mirrors

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Proceedings Article | 11 November 1999 Paper

Alignment and diagnostics of the National Ignition Facility laser system

Robert Boyd, Erlan Bliss, Steven Boege, Robert Demaret, Mark Feldman, Alan Gates, Fred Holdener, J. Hollis, Carl Knopp, Tom McCarville, Victoria Miller-Kamm, W. Rivera, J. Thaddeus Salmon, J. Severyn, Calvin Thompson, David Wang, Richard Zacharias

Proceedings Volume 3782, (1999) https://doi.org/10.1117/12.369229

KEYWORDS: Diagnostics, Sensors, Wavefronts, National Ignition Facility, Wavefront sensors, Spatial filters, Laser systems engineering, Control systems, Deformable mirrors, Optical amplifiers

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Proceedings Article | 23 July 1999 Paper

National Ignition Facility (NIF) wavefront control system

Richard Zacharias, Erlan Bliss, Mark Feldman, Andrew Grey, Mark Henesian, Jeffrey Koch, Janice Lawson, Richard Sacks, J. Thaddeus Salmon, John Toeppen, Lewis Van Atta, Scott Winters, Bruce Woods, Carlo Lafiandra, Donald Bruns

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354181

KEYWORDS: Wavefronts, National Ignition Facility, Control systems, Sensors, Actuators, Deformable mirrors, Mirrors, Wavefront sensors, Control systems design, Near field optics

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Proceedings Article | 23 July 1999 Paper

Application of adaptive optics for controlling the NIF laser performance and spot size

Richard Sacks, Jerome Auerbach, Erlan Bliss, Mark Henesian, Janice Lawson, Kenneth Manes, P. Renard, J. Thaddeus Salmon, John Trenholme, Wade Williams, Scott Winters, Richard Zacharias

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354146

KEYWORDS: Wavefronts, National Ignition Facility, Actuators, Adaptive optics, Optical amplifiers, Mirrors, Sensors, Beam splitters, Cobalt, Beam shaping

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Proceedings Article | 23 July 1999 Paper

Design progress for the National Ignition Facility laser alignment and beam diagnostics

Erlan Bliss, Steven Boege, Robert Boyd, Donald Davis, Robert Demaret, Mark Feldman, Alan Gates, Fred Holdener, Carl Knopp, R. Kyker, C. Lauman, Tom McCarville, John Miller, Victoria Miller-Kamm, W. Rivera, J. Thaddeus Salmon, J. Severyn, Sang Sheem, Stan Thomas, Calvin Thompson, David Wang, M. Yoeman, Richard Zacharias, Clifford Chocol, J. Hollis, Daniel Whitaker, J. Brucker, L. Bronisz, T. Sheridan

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354244

KEYWORDS: Sensors, Diagnostics, Prototyping, National Ignition Facility, Spatial filters, Optical alignment, Control systems, Wavefronts, Light sources, CCD image sensors

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Proceedings Article | 19 July 1999 Paper

Wavefront control system for the National Ignition Facility (NIF)

Richard Zacharias, Erlan Bliss, Mark Feldman, Andrew Grey, Jeffrey Koch, Richard Sacks, John Toeppen, Lewis Van Atta, Scott Winters, Bruce Woods

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354735

KEYWORDS: Wavefronts, National Ignition Facility, Control systems, Wavefront sensors, Control systems design, Laser applications, Optics manufacturing, Computing systems, Sensors, Interferometers

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The use of lasers as the driver for inertial confinement fusion experiments and weapons physics applications is based on their ability to produce high-energy short pulses in a beam with low divergence. Indeed, the focusability of high quality laser beams far exceeds alternate technologies and is a major factor in the rationale for building lasers for such applications The National Ignition Facility (NIF) is a large 192-beam laser facility now under construction at the Lawrence Livermore National Laboratory for fusion and weapons physics experiments. Its uncorrected focal spot minimum size is limited by wavefront aberrations in the laser system. NIF is designed with a wavefront control system to correct these aberrations to yield a focal spot that is small enough for NIF' s intended applications. Sources of aberrations to be corrected include prompt pump-induced distortions in the laser amplifiers, thermal distortions in the amplifiers from previous shots, beam off-axis effects, and gravity, mounting, and coating-induced optic distortions. Aberrations from gas density variations and manufacturing figure errors in the optics are also partially corrected by the wavefront control system. The NIF wavefront control system consists of five subsystems for each of the 192 beams: 1) a deformable mirror, 2) a wavefront sensor, 3) a computer controller, 4) a wavefront reference system, and 5) a rapid reconfiguration system to allow the wavefront control system to operate to within one second of the laser shot. The system includes the capability for in situ calibrations and operates in closed loop prior to the shot. Shot wavefront data is recorded. This paper describes the function, realization, and performance of each wavefront control subsystem. Subsystem performance will be characterized by computer models and by test results. The focal spot improvement in the NIF laser system effected by the wavefront control system will be characterized through computer models. The sensitivity of the target focal spot to various aberration sources will be presented. Analyses to optimize the wavefront control system will also be presented.

Proceedings Article | 8 December 1997 Paper

Wavefront correction for static and dynamic aberrations to within 1 second of the system shot in the NIF Beamlet demonstration facility

Robert Hartley, Michael Kartz, William Behrendt, Andy Hines, George Pollock, Erlan Bliss, J. Thaddeus Salmon, Scott Winters, Bruno Van Wonterghem, Richard Zacharias

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294315

KEYWORDS: Wavefronts, Control systems, Camera shutters, National Ignition Facility, Optical amplifiers, Polarization, Attenuators, Diagnostics, Optical filters

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Proceedings Article | 8 December 1997 Paper

NIF pointing and centering systems and target alignment using a 351-nm laser source

Steven Boege, Erlan Bliss, Clifford Chocol, Fred Holdener, John Miller, John Toeppen, Charles Vann, Richard Zacharias

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294311

KEYWORDS: Sensors, Reticles, Mirrors, Automatic alignment, Beam shaping, Cameras, National Ignition Facility, Spatial filters, Near field, Light sources

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