Gamma beam collimation system and profile imager for ELI-NP

Cardarelli, P.; Paterno, G.; Di Domenico, G.; Consoli, E.; Marziani, M.; Andreotti, M.; Evangelisti, F.; Squerzanti, S.; Gambaccini, M.; Albergo, S.; Cappello, G.; Tricomi, A.; Veltri, M.; Adriani, O.; Borgheresi, R.; Graziani, G.; Passaleva, G.; Serban, A.; Starodubtsev, O.; Variola, A.

doi:10.1016/j.nima.2018.10.049

ELI-NP-GBS is a high-brilliance gamma source that will produce monochromatic beams in the energy range 0.2–19.5 MeV through inverse Compton scattering. In order to obtain a monochromatic beam a collimation of the emission is necessary. Depending on the energy, the angular aperture required to provide the design bandwidth ΔE/E=0.5% is between 70 and 700 μrad. This collimation is provided by a stack of 14 tungsten slits, arranged with a relative rotation around the beam axis, so that the overlap will be a continuously adjustable aperture. To monitor the operation and alignment of the collimation, a set of detectors will provide a complete characterization of the gamma beam, including the measurement of the transverse spatial distribution. For this task a gamma beam profile imager based on a thin scintillator screen and a high-resolution CCD-camera was developed. In this work we briefly present the status of the collimation system and beam profile imager, which were designed, assembled and are currently under test at INFN-Ferrara laboratories.

Gamma beam collimation system and profile imager for ELI-NP / Cardarelli P., Paterno G., Di Domenico G., Consoli E., Marziani M., Andreotti M., Evangelisti F., Squerzanti S., Gambaccini M., Albergo S., Cappello G., Tricomi A., Veltri M., Adriani O., Borgheresi R., Graziani G., Passaleva G., Serban A., Starodubtsev O., Variola A.. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - ELETTRONICO. - 936:(2019), pp. 41-42. [10.1016/j.nima.2018.10.049]