1. Ultrafast probing of magnetic field growth inside a laser-driven solenoid
- Author
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King Fai Farley Law, J. D. Moody, Derek Mariscal, George Swadling, Laurent Divol, A. J. Johnson, David Turnbull, James Ross, S. Patankar, Shinsuke Fujioka, M. C. Levy, Gerald Williams, William Farmer, Otto Landen, A. Hazi, J. Javedani, Clement Goyon, B. B. Pollock, Andreas Kemp, Alexander M. Rubenchik, B. Grant Logan, and Dan Haberberger
- Subjects
Physics ,business.industry ,Solenoid ,Plasma ,Laser ,01 natural sciences ,Capacitance ,010305 fluids & plasmas ,law.invention ,Magnetic field ,symbols.namesake ,Optics ,law ,Hohlraum ,0103 physical sciences ,Faraday effect ,symbols ,010306 general physics ,business ,National Ignition Facility - Abstract
We report on the detection of the time-dependent B-field amplitude and topology in a laser-driven solenoid. The B-field inferred from both proton deflectometry and Faraday rotation ramps up linearly in time reaching 210 ± 35 T at the end of a 0.75-ns laser drive with 1 TW at 351 nm. A lumped-element circuit model agrees well with the linear rise and suggests that the blow-off plasma screens the field between the plates leading to an increased plate capacitance that converts the laser-generated hot-electron current into a voltage source that drives current through the solenoid. ALE3D modeling shows that target disassembly and current diffusion may limit the B-field increase for longer laser drive. Scaling of these experimental results to a National Ignition Facility (NIF) hohlraum target size (∼0.2cm^{3}) indicates that it is possible to achieve several tens of Tesla.
- Published
- 2017
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