Tsinghua University has designed an X-band (11.424 GHz) slow-wave parallel-coupled 10-cell standing-wave accelerator structure and operated it at high gradient with 40-ns-long RF pulses. High-power testing was conducted on the TPOT-X platform, and the highest gradient achieved was 130 MV/m after 1.1 × 107 conditioning pulses. Results show that the parallel-coupled structure is a promising choice for multi-cavity short-pulse accelerators and provides an effective solution for future high-gradient short-pulse applications.

We have developed an air insulated-fast rise time pulsed power Linear Transformer Driver (LTD) accelerator for use in driving High Energy Density Physics (HEDP) and High Power Microwave (HPM) sources. Our characterization of the device has yielded individual brick, wing, and full load currents as well as short circuit currents. The accelerator has been shown to operate successfully at various charge voltages.

A novel quasitransparent top-up injection scheme is expected to significantly improve the transparency of the injection process and reduce the recovery time for the targeted bunch, along with minimizing transverse wakefield effects and any interactions with the transverse multibunch feedback and harmonic cavity. Short stripline kickers and kicker power supplies are thus developed to provide a double pulse with a few-microsecond pulse spacing as the requirement of this scheme.

Plasma devices for beam transport are slowly being accepted as an alternative due to their potential for keeping or even reducing particle beam emittance, but also for compactness which supplements recent advances in compact laser plasma acceleration systems. Here we utilize a low-density plasma device to micro-bunch electron beams through a “cascade back focusing” caused by beam generated wake inside the plasma. Specialized particle-in-cell tools to study such phenomena over long distance (>cm), taking advantage of relativistic reference frames, is presented. Such devices have significant potential for shortening future FEL facilities and increasing current efficiency.

In storage ring-based light sources, laser modulation methods can enhance radiation output. However, this improvement is typically accompanied by degradation in beam quality and a reduction in radiation repetition rate. This work presents a demodulation method designed to mitigate these adverse effects and recover beam quality. Numerical simulations show that the proposed method preserves beam quality while enabling notable performance enhancements in the light source.

Transverse beam stabilization is essential for optimizing the performance of particle accelerators. The widely used Balakin-Novokhatsky-Smirnov (BNS) damping technique reduces transverse beam jitter but has inherent limitations, due to the need to operate several accelerating structures off-crest. We present an alternative strategy to introduce the necessary energy spread by exploiting the natural curvature of the RF accelerating field, in conjunction with a relatively long bunch and longitudinal wakefields. This method provides a damping of transverse oscillations—comparable to BNS damping—eliminating the disadvantage of the previous method.

Radio frequency (RF) spin rotators are essential devices in storage rings for manipulating the spin orientation of particles, vital for precision experiments like e.g. the search for electric dipole moments (EDM). Maintaining the resonance condition between a 120 kHz spin precession and the RF device’s frequency is challenging because frequency variations of the order of a few mHz have to be controlled in order to maintain stable conditions for a few hundred seconds. Adjusting a RF Wien filter’s frequency and phase in the Cooloer Synchrotron (COSY) to stabilize the relative phase with the 120 kHz spin precession, we achieved a standard deviation of approximately 0.2 rad.

We present a simulation configuration for the electron beam profile consistent with experiments on the linac UERL-10-15S2. Using this configuration, we have simulated the irradiation of ETS-10 zeolite. This simulation was set up with various electron energy distributions, yielding results on the dose rate distribution (2D dose map) and the mean absolute percentage deviation of the absorbed dose rate within the irradiated titanosilicate. Notably, we introduce a new mathematical function by modifying the approximated Landau distribution. The function offers a better fit and, more importantly, accurately reflects the physical nature of the energy spectrum of electrons passing through a thin layer of matter.