Ricerc@Sapienza

In high-brightness LINear ACcelerators (LINACs), electron bunch length can be measured indirectly by a radio frequency deflector (RFD). In this paper, the accuracy loss arising from non-negligible correlations between particle longitudinal positions and the transverse plane (in particular the vertical one) at RFD entrance is analytically assessed. Theoretical predictions are compared with simulation results, obtained by means of ELEctron Generation ANd Tracking (ELEGANT) code, in the case study of the gamma beam system (GBS) at the extreme light infrastructure—nuclear physics (ELI-NP).

The Gamma Beam System (GBS) is a high brightness LINAC to be installed in Magurele (Bucharest) at the newELI-NP (Extreme Light Infrastructure — Nuclear Physics) laboratory. The accelerated electrons, with energiesranging from 280 to 720 MeV, will collide with a high power laser to produce tunable high energy photons(0.2–20 MeV ) with high intensity (1013photons/s), high brilliance and spectral purity (0.1%BW), through theCompton backscattering process. This light source will be open to users for nuclear photonics and nuclear physicsadvanced experiments.

A high brightness electron Linac is being built in the Compton Gamma Source at the ELI Nuclear Physics facility in Romania. To achieve the design luminosity, a train of 32 bunches, 16 ns spaced, with a nominal charge of 250 pC will collide with the laser beam in the interaction point. Electron beam spot size is measured with optical transition radiation (OTR) profile monitors. In order to measure the beam properties, the optical radiation detecting system must have the necessary accuracy and resolution.

This contribution describes the irradiation set-up for electronic and space components testing with pulsed 30 MeV proton beam of high instantaneous dose rate provided by the TOP-IMPLART linear accelerator at ENEA Frascati Research Centre.