Speaker
Description
The ability of laser plasma accelerators (LPA) to produce quasimonoenergetic electron beams with energies ranging from tens of MeV to tens of GeV in just a few millimeters to centimeters brought LPA to the attention of many scientific and industry fields. Arguably the most important of them is medicine, in a newly developed, so-called FLASH radiotherapy. In this regard, generating high-quality beams in terms of energy, pointing stability, and charge is crucial, and therefore their monitoring is essential. However, the electrical devices used for diagnostics can be directly or indirectly affected by transient electromagnetic pulses (EMPs) with a large frequency range normally occurring during laser-plasma interaction. In the case of charge measurements, overestimation by integrating current transformers (ICTs) has been previously reported and linked with the EMP influence. For this reason, experimental studies have been conducted at the ILIL, INO-CNR, in which electron beam charge has been directly measured by the integrating current transformer (ICT). The results have been compared with charge measurements retrieved from irradiated radiochromic films. At the same time, ICT charge measurements have been put into a correlation with the Lanex screen emission signal.
