Electromagnetic Pulses at Short-Pulse Laser Facilities

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Electromagnetic Pulse (EMP) is a known issue for short-pulse laser facilities, and will also be an issue for experiments using the advanced radiographic capability (ARC) at the National Ignition Facility (NIF). The ARC diagnostic uses four NIF beams that are compressed to picosecond durations for backlighting ignition capsules and other applications. Consequently, we are working to understand the EMP due to high-energy (MeV) electrons escaping from targets heated by short-pulse lasers. Our approach is to measure EMP in the Titan short-pulse laser at Lawrence Livermore National Laboratory (LLNL) and to employ that data to establish analysis and simulation capabilities. We ... continued below

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Brown, Jr., C G; Throop, A; Eder, D & Kimbrough, J August 28, 2007.

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Electromagnetic Pulse (EMP) is a known issue for short-pulse laser facilities, and will also be an issue for experiments using the advanced radiographic capability (ARC) at the National Ignition Facility (NIF). The ARC diagnostic uses four NIF beams that are compressed to picosecond durations for backlighting ignition capsules and other applications. Consequently, we are working to understand the EMP due to high-energy (MeV) electrons escaping from targets heated by short-pulse lasers. Our approach is to measure EMP in the Titan short-pulse laser at Lawrence Livermore National Laboratory (LLNL) and to employ that data to establish analysis and simulation capabilities. We have installed a wide variety of probes inside and outside the Titan laser chamber. We have high-frequency B-dots and D-dots, a photodiode, and fast current-viewing and integrating current transformers. The probe outputs are digitized by 10 and 20 Gsample/s oscilloscopes. The cables and oscilloscopes are well shielded to reduce noise. Our initial measurement campaign has yielded data useful mainly from hundreds of MHz to several GHz. We currently are supplementing our high-frequency probes with lower-frequency ones to obtain better low-frequency data. In order to establish analysis and simulation capabilities we are modeling the Titan facility using various commercial and LLNL numerical electromagnetic codes. We have simulated EMP generation by having a specified number of electrons leave the target and strike the chamber wall and other components in the chamber. This short impulse of electrons has a corresponding broad spectrum, exciting high-frequency structure in the resulting EMP. In this paper, we present results of our initial measurement campaign and comparisons between the measurements and simulations.

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PDF-file: 6 pages; size: 1.2 Mbytes

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  • Presented at: IFSA Conference, Kobe, Japan, Sep 09 - Sep 14, 2007

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  • Report No.: UCRL-CONF-234483
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 917899
  • Archival Resource Key: ark:/67531/metadc890617

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  • August 28, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 23, 2016, 6:04 p.m.

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Brown, Jr., C G; Throop, A; Eder, D & Kimbrough, J. Electromagnetic Pulses at Short-Pulse Laser Facilities, article, August 28, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc890617/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.