ICALEPCS2013 - List of Authors (Dixit, S.N.)

Paper

Title

Page

Software Tool Leverages Existing Image Analysis Results to Provide In-Situ Transmission of the NIF Disposable Debris Shields

1270

V.J. Miller Kamm, A.A.S. Awwal, J.-M.G. Di Nicola, P. Di Nicola, S.N. Dixit, D.L. McGuigan, B.A. Raymond, K.C. Wilhelmsen
LLNL, Livermore, California, USA

Funding: * This work was performed under the auspices of the Lawrence Livermore National Security, LLC, (LLNS) under Contract No. DE-AC52-07NA27344. #LLNL-ABS-632472
The Disposable Debris-Shield (DDS) Attenuation Tool is software that leverages Automatic Alignment image analysis results and takes advantage of the DDS motorized insertion and removal to compute the in-situ transmission of the 192 NIF DDS. The NIF employs glass DDS to protect the final optics from debris and shrapnel generated by the laser-target interaction. Each DDS transmission must be closely monitored and replaced when its physical characteristics impact laser performance. The tool was developed to calculate the transmission by obtaining the total pixel intensity of acquired images with the debris shield inserted and removed. These total intensities existed in the Automatic Alignment image processing algorithms. The tool uses this data, adding the capability to specify DDS to test, moves the DDS, performs calculations, and saves data to an output file. It operates on all 192 beams of the NIF in parallel, and has shown a discrepancy between laser predictive models and actual. As qualification the transmission of new DDS were tested, with known transmissions supplied by the vendor. This demonstrated the tool capable of measuring in-situ DDS transmission to better than 0.5% rms.

Poster THPPC083 [2.362 MB]

THCOCB02

The Role of Data Driven Models in Optimizing the Operation of the National Ignition Facility

1426

K.P. McCandless, J.-M.G. Di Nicola, S.N. Dixit, E. Feigenbaum, R.K. House, K.S. Jancaitis, K.N. LaFortune, B.J. MacGowan, C.D. Orth, R.A. Sacks, M.J. Shaw, C.C. Widmayer, S.T. Yang
LLNL, Livermore, California, USA

Funding: * This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. #LLNL-ABS-633233
The Virtual Beam Line (VBL) code is essential to operate, maintain and validate the design of laser components to meet the performance goals at Lawrence Livermore National Laboratory’s National Ignition Facility (NIF). The NIF relies upon the Laser Performance Operations Model (LPOM), whose physics engine is the Virtual Beam Line (VBL) code, to automate the setup of the laser by simulating the laser energetics of the as-built system. VBL simulates paraxial beam propagation, amplification, aberration and modulation, nonlinear self-focusing and focal behavior. Each of the NIF’s 192 beam lines are modeled in parallel on the LPOM Linux compute cluster during shot setup and validation. NIF achieved a record 1.8 MJ shot in July 2012, and LPOM (with VBL) was key to achieving the requested pulse shape. We will discuss some examples of how the VBL physics code is used to model the laser phenomena and operate the NIF laser system.

Slides THCOCB02 [4.589 MB]

Paper	Title	Page
THPPC083	Software Tool Leverages Existing Image Analysis Results to Provide In-Situ Transmission of the NIF Disposable Debris Shields	1270
	V.J. Miller Kamm, A.A.S. Awwal, J.-M.G. Di Nicola, P. Di Nicola, S.N. Dixit, D.L. McGuigan, B.A. Raymond, K.C. Wilhelmsen LLNL, Livermore, California, USA
	Funding: * This work was performed under the auspices of the Lawrence Livermore National Security, LLC, (LLNS) under Contract No. DE-AC52-07NA27344. #LLNL-ABS-632472 The Disposable Debris-Shield (DDS) Attenuation Tool is software that leverages Automatic Alignment image analysis results and takes advantage of the DDS motorized insertion and removal to compute the in-situ transmission of the 192 NIF DDS. The NIF employs glass DDS to protect the final optics from debris and shrapnel generated by the laser-target interaction. Each DDS transmission must be closely monitored and replaced when its physical characteristics impact laser performance. The tool was developed to calculate the transmission by obtaining the total pixel intensity of acquired images with the debris shield inserted and removed. These total intensities existed in the Automatic Alignment image processing algorithms. The tool uses this data, adding the capability to specify DDS to test, moves the DDS, performs calculations, and saves data to an output file. It operates on all 192 beams of the NIF in parallel, and has shown a discrepancy between laser predictive models and actual. As qualification the transmission of new DDS were tested, with known transmissions supplied by the vendor. This demonstrated the tool capable of measuring in-situ DDS transmission to better than 0.5% rms.
	Poster THPPC083 [2.362 MB]

THCOCB02	The Role of Data Driven Models in Optimizing the Operation of the National Ignition Facility	1426
	K.P. McCandless, J.-M.G. Di Nicola, S.N. Dixit, E. Feigenbaum, R.K. House, K.S. Jancaitis, K.N. LaFortune, B.J. MacGowan, C.D. Orth, R.A. Sacks, M.J. Shaw, C.C. Widmayer, S.T. Yang LLNL, Livermore, California, USA
	Funding: * This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. #LLNL-ABS-633233 The Virtual Beam Line (VBL) code is essential to operate, maintain and validate the design of laser components to meet the performance goals at Lawrence Livermore National Laboratory’s National Ignition Facility (NIF). The NIF relies upon the Laser Performance Operations Model (LPOM), whose physics engine is the Virtual Beam Line (VBL) code, to automate the setup of the laser by simulating the laser energetics of the as-built system. VBL simulates paraxial beam propagation, amplification, aberration and modulation, nonlinear self-focusing and focal behavior. Each of the NIF’s 192 beam lines are modeled in parallel on the LPOM Linux compute cluster during shot setup and validation. NIF achieved a record 1.8 MJ shot in July 2012, and LPOM (with VBL) was key to achieving the requested pulse shape. We will discuss some examples of how the VBL physics code is used to model the laser phenomena and operate the NIF laser system.
	Slides THCOCB02 [4.589 MB]