Designing a stripline injection kicker for the Hadron Storage Ring (HSR) of Brookhaven’s future Electron-Ion Collider presents a significant challenge. To inject high-rigidity beams, the kicker must sustain high pulsed voltages with fast rise time and extended flattop duration while the impedance of cables and feedthroughs are precisely matched. This paper introduces an innovative impedance fine-tuning mechanism by precision adjustment of kicker aperture. Comprehensive analyses of characteristic and beam coupling impedances, beam-induced heating, and electric field constraints are presented to support the kicker’s robust performance.

NanoTerasu, a new 3 GeV synchrotron light source in Japan, began user operation in April 2024. It provides high-brilliance soft-to-tender X-rays with a natural horizontal emittance of 1.14 nm rad beam. This paper represents the accelerator machine commissioning and our model-consistent ring optics correction. The first user operation with a stored beam current of 160 mA is also reported.

Red-shifted Free Electron Lasers based on strongly chirped electron beams emerged a few years ago in the frame of FEL developments on laser-plasma accelerators as well as in the revived interest of cavity-based FEL configuration. We present a thourough study of the tunability (see main tunability curve in the Figure) of such systems relying on both analytical modeling and experimental results on the COXINEL (COherence Xray source INferred from Electrons accelerated by Laser) FEL beamline driven by a laser plasma accelerator at Helmholtz-Zentrum Dresden-Rossendorf.

Local Chromatic Correction optics are proposed for the Future Circular e+ − e− Collider. These new optics assume an identical layout of the magnets at all operation. The arcs design is a step forward from the classic FODO lattice that achieves near cancellation up to the fourth order of chromatic and geometric aberrations. Straight sections and final focus benefit from the application of transparency conditions. The final focus design includes additional specific sextupoles and decapoles for the optimization of the dynamics off-energy. Decapoles are very effective to mitigate the reduction of dynamic aperture due to synchrotron radiation.

This study has optimized the baseline configuration of the Compact Linear Collider’s Rings-To-Main-Linac sections, especially the bunch compressors. Some outstanding issues in previous designs have finally been resolved, and the expected costs of the bunch compressors are significantly reduced. A complete and improved set of beam-based alignment methods is outlined, and detailed start-to-end realistic simulations are presented, showing the effectiveness and success of the methods in addressing static imperfections

This study extends the mode matching technique to arbitrary three-dimensional accelerator structures, providing accurate computations of longitudinal impedance. This method overcomes the limitations of traditional numerical tools, especially for non-ultrarelativistic beams and structures with low wall losses. The results enable more precise impedance modeling, essential for stability and performance in particle accelerators.

Electron beams from high-brightness continuous-wave photocathode guns are sensitive to aberrations induced by multipole fields. An efficient method is presented for rapid characterization and correction of multipole field impact on the electron beam. This results in improved beam symmetry and emittance.

The SHERPA experiment at LNF-INFN experimentally demonstrated, for the first time, the feasibility of using a bent silicon crystal to slowly extract 500 MeV positrons and electrons circulating in one of the DAΦNE accelerator rings. Using the channeling effect in a bent silicon crystal 15 microns thick, 450 MeV positrons and electrons with a 1.26 mrad deflection have been observed.

Stripped proton beam loss in the Superconducting Linac (SCL) represents a significant source of heat and radioactivity, which could threaten the operation of the SCL. Stripped protons, primarily produced in the Low Energy Beam Transport (LEBT), are mostly removed by bending the H⁻ beam at an angle of 1.8 degrees before it enters the RFQ accelerator (up). As the distribution of residual gas decreases rapidly with distance from the ion source, the bending magnet located after Pump Chamber 2 deflects nearly all of the stripped protons out of the RFQ’s acceptance (down-right), while the transmission of H⁻ ions remains unaffected (down-left).

Space charge can generate large incoherent tune shifts within electron bunches in fourth generation light sources, leading to a variety of beam dynamics effects. Shown in the figure: a typical situation in a high-charge Timing mode of PETRA IV light source.

A modified one-dimensional coherent synchrotron radiation (CSR) kick model that accounts for bunch length variations within dipoles is presented. Using this model, we theoretically derive CSR suppression conditions for a double-bend achromat (DBA) compressor, providing new insights into controlling CSR effects in beam dynamics.

We demonstrate the recovery of linear and nonlinear optics in a hadron synchrotron using the Deep Lie Map Network (DLMN), a data-driven approach integrating charged particle dynamics with machine learning. By analyzing beam position monitor data, DLMN updates magnetic multipole components, refining the optics model for direct use in accelerator physics tools and tracking codes. Experimental validation confirms agreement with established optics measurement methods.