Diagnostics improvement in the ABC facility and preliminary tests on laser interaction with light-atom clusters and p+11B targets

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

“…A superwideband (SWB) antenna was also used at ~48 cm from the target 14 15 16 57 , in a region of the chamber close to the surface and well protected against direct plasma radiation by thick conductive objects. Results in time and frequency domain are compared in Fig.…”

“…Interactions between high energy and high intensity lasers with matter produce particle flux and electromagnetic radiation over a wide range of energy 1 2 . The generation of transient fields of very high intensity in the radiofrequency-microwave regime has been observed for femtosecond to nanosecond laser pulses with 10 11 –10 20 W/cm 2 intensity, on both conductive and dielectric targets 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 . These fields have a bandwidth of several GHz and last for hundreds of nanoseconds.…”

“…The generation of transient fields of very high intensity in the radiofrequency-microwave regime has been observed for femtosecond to nanosecond laser pulses with 10 11 –10 20  W/cm 2 intensity, on both conductive and dielectric targets3456789101112131415161718192021. These fields have a bandwidth of several GHz and last for hundreds of nanoseconds.…”

“…EMPs have been previously characterized with conductive probes3456789101112131415161718192021, but only a few works specifically address the absolute measurements of the associated electric fields, which are accomplished by D-dot and B-dot probes (sensitive to and respectively)2526. This is mainly due to the difficulties in performing reliable measurements with suitable signal-to-noise ratio (SNR).…”

Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS

“…Some of generated fast electrons are escaping the target, leaving behind a positive electric charge and generating a selfconsistent ambipolar electric field that accelerates ions and slow electrons, and they are creating a strong electromagnetic pulse (EMP) long after the end of the laser-target interaction. [1][2][3][4][5][6][7][8][9][10][11] A mitigation of degradation of signals from plasma diagnostics by EMP interference and protection of electrical equipment as, e.g., a target manipulator, scintillation detectors, CCD cameras, ion detectors against their damage can be ensured by effective grounding and shielding. [4][5][6] Such EMP may be emitted for a period of the order of hundreds of nanoseconds to microseconds after the laser pulse.…”