Abstract
The ELI-NP facility, currently being built in Bucharest, Romania, will deliver an intense and almost monochromatic gamma beam with tunable energy between 0.2 and 20 MeV. The challenging energy bandwidth of [Formula: see text]0.5% will be adjusted through the collimation system, while the main beam parameters will be measured through a devoted gamma-beam characterization system.[Formula: see text] The gamma-beam characterization system, designed by the EuroGammaS collaboration, consists of four elements: a Compton spectrometer that measures the gamma energy spectrum; a sampling calorimeter for a fast combined measurement of the beam average energy and its intensity, which will be used also as a monitor during machine commissioning and development; a nuclear resonant scattering system for absolute energy inter-calibration of the other detectors; and a gamma beam profile imager to be used for alignment and diagnostics purposes. The collimation and characterization system will be presented in this article. These systems have already been built and tested, while the delivery at ELI-NP facility and the final commissioning is scheduled by Fall 2018.
Highlights
ELI (Extreme Light Infrastructure) is a project involving over 40 institutions from 13 European countries
The research activities foreseen for the ELI-NP experiments[3]
The following sections include a brief description of the design of the collimator and the beam-characterization system, as well as details of the simulation studies and the preliminary tests performed on any subsystem
Summary
ELI (Extreme Light Infrastructure) is a project involving over 40 institutions from 13 European countries. The research activities foreseen for the ELI-NP experiments[3] The GBS4 will produce an intense γ-beam from Compton inverse scattering of a 515 nm pulsed laser light from an electron beam with tunable energy between 80 and 720 MeV This will turn into a γbeam energy ranging between 0.2 MeV and 19.5 MeV. The following sections include a brief description of the design of the collimator and the beam-characterization system, as well as details of the simulation studies and the preliminary tests performed on any subsystem
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