Fabrication and absolute calibration of B-dot probe for magnetic field measurement on a high power laser facility

Abstract

The fabrication and absolute calibration of a B-dot probe is employed to measure the pulsed magnetic field at the Shenguang-II high power laser facility. Copper enameled silk with a cross section diameter of 0.1 mm is used to wind the one-turn coil with a 1 mm diameter. Two coils are paired and reversely linked to their respective circuits to form a differential B-dot probe that is sealed in and protected by a quartz shell. This B-dot probe is experimentally calibrated and then used to measure the pulsed magnetic field in laser targeting experiments at the Shenguang-II high power laser facility. Signals show a high performance of this B-dot probe. The common mode noise can be effectively canceled out by the differential pair. The magnetic field of over 300 T can be extrapolated at the location close to the target.

Spatial and temporal evolution of electromagnetic pulses from solid target irradiated with multi-hundred-terawatt laser pulse inside target chamber

“…XG-III laser can output synchronized nanosecond, picosecond, and femtosecond beams with three wavelengths of 527 nm, 1053 nm, and 800 nm [32]. Moreover, by super continuum generation and femtosecond optical parametric amplification (OPA), three beams are generated from the same source to achieve precise synchronization [33,34]. The experimental schematic diagram for EMP detection is presented in figure 1(a).…”