Physical design of the 1.5 GeV LINAC injector for the WALS facility

Le résumé fourni par la source

The Wuhan Advanced Light Source (WALS) is a high-brightness fourth-generation synchrotron radiation light source designed to generate high-quality X-ray beams using a top-up linear accelerator (LINAC) as an injector. The LINAC will provide electron beams for a low-energy storage ring (1.5 GeV), a medium-energy storage ring (4 GeV), and a free-electron laser (FEL). In the first phase, a low-energy diffraction-limited storage ring (DLSR) operating at 1.5 GeV is proposed. To meet the high current requirements for the DLSR and low beam emittance for the FEL, a photoinjector-based top-up LINAC is identified as the optimal solution. This study employs a multi-objective optimization algorithm to improve the photoinjector's performance and uses a laser pulse delay scheme validated on the TTX platform at Tsinghua University to achieve a pulse train structure with a single bunch charge of 1 nC and a time gap between micro-bunches of 2.1 ns. Beam optimization simulations for the 1.5 GeV LINAC at a bunch charge of 1 nC yield an RMS energy spread below 0.1 %, and normalized emittances of 1.64 mm·mrad (horizontal) and 0.97 mm·mrad (vertical). These results demonstrate the feasibility of the LINAC system to simultaneously provide high-quality beams for both the DLSRs and the FELs.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.