Abstract
The Gamma Beam System (GBS) of ELI-NP is a linac based gamma-source in construction at Magurele (RO) by the European consortium EuroGammaS led by INFN. Photons with tunable energy and with intensity and brilliance well beyond the state of the art will be produced by Compton back-scattering between a high quality electron beam (up to 740 MeV) and a 515 nm intense laser pulse. Production of very intense photon flux with narrow bandwidth requires multi-bunch operation at 100 Hz repetition rate. A total of 13 klystrons, 3 S-band (2856 MHz) and 10 C-band (5712 MHz) will power a total of 14 Travelling Wave accelerating sections (2 S-band and 12 C-band) plus 3 S-band Standing Wave cavities (a 1.6 cell RF gun and 2 RF deflectors). Each klystron is individually driven by a temperature stabilized LLRF module, for a maximum flexibility in terms of accelerating gradient, arbitrary pulse shaping (e.g. to compensate beam loading effects in multi-bunch regime) and compensation of long-term thermal drifts. In this paper, the whole LLRF system architecture and bench test results, the RF reference generation and distribution together with an overview of the synchronization system will be described.
Highlights
An advanced source of gamma-ray photons will be built in Magurele (Bucharest) in the framework of the ELI-NP-Gamma Beam System (GBS) project [1, 2] by the EuroGammaS consortium led by INFN
The Gamma Beam System (GBS) of ELI-NP is a linac based gamma-source in construction at Magurele (RO) by the European consortium EuroGammaS led by INFN
Photons with tunable energy and with intensity and brilliance well beyond the state of the art will be produced by Compton back-scattering between a high quality electron beam and a 515 nm intense laser pulse
Summary
An advanced source of gamma-ray photons will be built in Magurele (Bucharest) in the framework of the ELI-NP-GBS project [1, 2] by the EuroGammaS consortium led by INFN. In order to reduce bunch-by-bunch energy spread due to structure beam loading (BL), a tailored pulse shaping compensation has to be provided to the klystrons by the LLRF systems [5]. The LLRF system for the ELI-NP-GBS project (Libera LLRF) has been manufactured by Instrumentation Technologies (SI) [14] and consists of 13 temperature stabilized RF front ends (one for each power unit): 3 S-band and 10 C-band. This choice has been made in order to guarantee the maximum flexibility in terms of pulse shaping and machine operation stability.
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