Abstract
From May 2009 to the present we have recorded electromagnetic pulse (EMP) strength and spectrum (100 MHz – 5 GHz) in the target bay and chamber of the National Ignition Facility (NIF). The dependence of EMP strength and frequency spectrum on target type and laser energy is discussed. The largest EMP measured was for relatively low-energy, short-pulse (100 ps) flat targets.
Highlights
Protection of sensitive diagnostics at laser facilities requires information on electromagnetic pulse (EMP) strength and frequency spectrum
National Ignition Facility (NIF) operates with pulse durations from approximately 0.1 to 30 ns
An advanced diagnostic system planned for NIF, the Advanced Radiographic Capability (ARC), requires shorter pulse durations in the 1 to 10 ps range
Summary
Protection of sensitive diagnostics at laser facilities requires information on EMP strength and frequency spectrum. See [1,2,3,4,5,6] for previous work on EMP in laser facilities. NIF operates with pulse durations from approximately 0.1 to 30 ns. An advanced diagnostic system planned for NIF, the Advanced Radiographic Capability (ARC), requires shorter pulse durations in the 1 to 10 ps range. Based on results presented here and data from our work at the short-pulse Titan laser facility [5, 6], we expect the EMP on NIF to increase significantly during ARC operation. We conclude with very interesting results on the energy scaling of EMP as a function of target type
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