The next seminar on Thu 4/5 at 16:00 CET, organised by COST Action PROBONO and HB11 Energy will be given by Martina Salvadori on the topic of "Advanced Time-Of-Flight schemes for ion spectrometry in laser-driven experiments "
Link: https://us06web.zoom.us/j/82949032006?pwd=WmpLYlF1ZC9qV0RYT3l6MGNkREsrdz09
ABSTRACT
The univocal identification of the alphas produced by the laser-initiated 11B(p,α)2α fusion reaction is a well-known challenging task. This is due both to the low flux of emitted alphas and to the multifaceted emission typical of laser-matter interactions, indeed the signal coming from alphas is often superimposed to that generated by protons and by other ions, and in many cases, it is therefore hardly recognizable. The diagnostics commonly used to characterize the ionic products of the pB reaction are track detectors, Thomson spectrometers and time of flight technique, the discrimination of alphas can be achieved by the simultaneous use of these diagnostic tools placed in close proximity and providing complementary information. Nevertheless, during the interaction of highintensity laser with matter, electromagnetic waves in the radiofrequency-microwave range (EMPs) are produced and can lead to the malfunctioning of the electric devices placed nearby the interaction point affecting the signal collected by the TOF detector. Moreover, they can overlap to the electric and magnetic field of the Thomson Spectrometer causing unwanted modulation of the ion traces.
In this talk I will describe the work that has been done for developing and advanced TOF methodology and diagnostic system which is resistant to the EMPs while granting high energy resolution, dynamic range and sensitivity.
Time of flight does not provide ion discrimination that, for particles having different mass-to-charge ratio, can instead be achieved by the employment of a Thomson Spectrometer (TS). Thus the signal of the alphas will be well separated to the one generated by protons but will still be superimposed to those generated by all other ions having the same mass-to-charge ratio, such as C6+, N7+ or O8+. In the final part of the talk, I will briefly introduce the possibility of using an adequate differential filtering system for the exclusion from the α-particle trace of the contribution of all other ionic species and the feasibility of integrating in the TS assembly a particle detector for Time-Of-Flight (TOF) measurements.
The seminar series is co-organized by COST Action CA21128-PROBONO and HB11Energy
