High performance diagnostics for Time-Of-Flight and X ray measurements in laser produced plasmas, based on fast diamond detectors

Abstract

The paper reports about the use of single-crystal Chemical Vapour Deposited (CVD) diamonds as radiation detectors in laser-matter interaction experiments on the ABC laser in ENEA -Frascati. The detectors have been designed and realized by University of Tor Vergata -Rome. The interdigital configuration and the new design of the bias-tee voltage supply units guarantee a fast time response. The detectors are sensitive to soft-X photons and to particles. A remarkable immunity to electromagnetic noise, associated with the laser-target interaction, makes them especially useful for the measurements of the time of flight of fast particles. A novel diamond assembly has been tested in plasmas generated by the ABC laser in the nanosecond regime at intensities I = 10 13÷14 W/cm 2 , where contributions from X rays, fast electrons and ions could be observed. K: Diamond Detectors; Plasma diagnostics -charged-particle spectroscopy; Plasma generation (laser-produced, RF, x ray-produced); X-ray detectors 1Corresponding author.

Simultaneous observation of ultrafast electron and proton beams in TNSA

“…The temporal structure of the positively charged beam has been measured by means of an electromagnetic-pulse-free TOF diamond detector [26,27] , placed 1.05 m downstream of the target at 0 • with respect to the laser direction. This tool allowed us to retrieve the proton energy spectrum for each shot [20] .…”

Single-shot electrons and protons time-resolved detection from high-intensity laser–solid matter interactions at SPARC_LAB

“…Electro-magnetic pulses (EMPs) usually represent a source of noise when this kind of detector is placed inside the interaction chamber [26] . Nevertheless, thanks to the specialized assembly design [25] and optimization of the readout system [26] , signals with negligible EMP contributions have been measured.…”

Diagnostic Methodologies of Laser-Initiated 11B(p,α)2α Fusion Reactions

“…This information is commonly achieved on the same measurement because detectors commonly used in these schemes are sensitive also to the emitted UV-X-rays. The velocity resolution is given by the overall time resolution of the detection scheme divided by the target-detector distance, where the overall time resolution accounts for that of the detector (usually in the nanosecond order in classical Diamond or SiC Detectors), and that of the employed hardware (oscilloscopes, long cables used for connections) [37,[71][72][73]. To overcome the limitations due to the time resolution, one needs to place the detector at some distance from the interaction point.…”