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    KAPTEOS TIME-RESOLVES MEASUREMENTS OT EMP

    EMP – TIME-RESOLVED ABSOLUTE MEASUREMENTS OF GIANT ELECTROMAGNETIC PULSES

     

    Measurement of giant EMP generated by intense laser-matter interaction

    Kapteos has performed a test using a prototype probe to measure a magnetic field induced by a rail gun system.
    This magnetic probe could measure H-Field up to few MA/m from 40 Hz to 50 kHz. Please click on the following Application Note to learn more about this.

     

     Application Note: Time-resolved absolute measurements by electro-optic effect of giant electromagnetic pulses due to laser-plasma interaction in nanosecond regime

     

    Background

    The ELI (European Extreme Light Infrastructure) enlisted Kapteos in a European ESFRI (European Strategy Forum on Research Infrastructures) project for the investigation of light-matter interactions at highest intensities and shortest time scales.

     

    Specifically, the project was to measure E-Fields in a Giant EMP

    The Project Test Environment consisted of:

     Ultra high electric (E) field expected

     Ultra short EMP expected

     Ultra harsh environment
    – Extreme light fluence
    – X-rays
    – Single shot
    – High vacuum
     Relativistic particles generation
    – Radial E-field enhancement ← Liénard-Wiechert Liénard-Wiechert
     Experience chamber
    – Faraday cage → multiple reflection problematic multiple reflection problematic

     

    Probe specifications for EMP measurement
     Ultra Wide Band (from MHz → multiple reflection problematic 50 GHz)
    – In accordance with specifications of best real time oscilloscopes (LeCroy, TekTronix, …)
     Long distance required from E-field transducer to digitizer
    – High dispersion & absorption in RF cables
    – EMC problematic (conducted and radiated interferences)
    – Only solution → multiple reflection problematic optical link
     Short distance from target to E-field transducer
    – Required for echoes suppression via time windowing
     Artefact free from
    – X rays & Extreme optical fluences

     

    Electro-optic probes (Kapteos eoProbe)
     Full dielectric, low permittivity
    – Almost no interference with the E field to be measured
     4 years collaboration with ENEA Frascati
    – Group of Fabrizio Consoli
    – Measurement with ABC laser
    – – 30 J, 3 ns FWHM
     Specific sheath for probe shielding against
    – Extreme light fluence
    – X-rays artefacts
     Simultaneous of the 3 E-field components
    – Less than 100 mm from target
    – With spatial resolution < 10 mm

     Application Note: Time-resolved absolute measurements by electro-optic effect of giant electromagnetic pulses due to laser-plasma interaction in nanosecond regime

     

     Presentation: Measurement of giant EMP generated by intense laser matter interaction