The RF beam sweeper at ATLAS facility plays a key role in the production of radioactive ion beams by enabling time-of-flight-based separation, thereby improving the purity of in-flight rare isotope beams. The current sweeper operates 6 MHz and achieves a maximum deflecting voltage of 55 kV. However, the enhanced beam capabilities introduced by the Argonne In-flight Ion separator (RAISOR) require a more versatile and higher-performance sweeper. To meet these needs, we are developing an upgraded RF sweeper capable of operating at 6 MHz and 12 MHz, with an improved deflecting voltage of 150 kV. The system employs a resonant circuit architecture incorporating electrode plates, an adjustable coil, and a mechanical sliding switch to facilitate frequency adjustment. In this talk, we will present design considerations and fabrication progress of the new RF sweeper, aimed at supporting next-generation rare isotope beam experiments.

Accurate measurement of longitudinal beam parameters is critical for optimizing high-intensity linear accelerators, yet remains difficult for non-relativistic proton and ion beams. The Bunch Shape Monitor (BSM) is a diagnostic device designed to measure the longitudinal profile of charged particle beams. It operates by inserting a thin wire into the beam path, which emits secondary electrons upon interaction with the main beam. These electrons retain the temporal charge distribution information of the primary beam, which is then converted into a spatial distribution using an RF deflector. Existing BSM models suffer from low electron collection efficiency and are limited to one-dimensional measurements of the longitudinal phase coordinate. To address these limitations, RadiaBeam has developed a next-generation BSM prototype featuring a refined focusing field between the target wire and entrance slit to increase secondary electron collection efficiency, an improved RF deflector for greater temporal resolution and linearity, and an upgraded movable mechanism to enable both longitudinal and transverse profile measurements. In this talk, we will present recent beam test results performed at the Spallation Neutron Source (SNS), highlighting improvements to the BSM based on insights from initial experimental data. Additionally, we will discuss further modifications to the BSM needed for compatibility with other facilities, such as PIP-II at Fermilab.

Effective control of power reflections in high-power RF systems is essential for maintaining energy efficiency and protecting system components. Virtual Critical Coupling (VCC) is a novel approach that allows to eliminate reflections by temporally shaping a complex frequency excitation signal in a resonator to ensure that it fully traps all impinging energy. The absorbed energy is stored in the resonator without being dissipated, and it can be released at will. Unlike traditional coupling techniques, this method does not require mechanical modifications. In this talk, we will present VCC experimental results achieved in an S-band standing wave linear accelerator using a custom low-level RF system and a 5 MW klystron. These findings demonstrate a scalable method for improving the efficiency and stability of high-power resonant systems with potential applications in accelerator technology.

Beam injection systems in hadron colliders require kickers generating ±50 kV peak voltages into a 50 Ω impedance, with peak currents of 1000 A and sub-10 ns rise and fall times. This paper presents a novel high-voltage pulse power generator utilizing a dis-tributed pulser architecture. It combines gallium nitride (GaN) transistors in a Marx to-pology with an inductive adder, achieving nanosecond-scale switching speeds and high-power efficiency. Compared to other solutions such as based on MOSFETs or fast ioniza-tion dynistors, our development offers superior peak and average power performance, reduced system complexity, and enhanced reliability, marking a significant step forward in high-voltage pulse generation for accelerator applications.

X-ray generators, producing radiation in the MeV range, are a critical tool for radiography, non-destructive testing, and security applications. The field operation of such source requires them to be hand-portable, autonomous, and allow parameter adjustability. The dramatic level of miniaturization and cost-reduction of electron linac is achieved thanks to the implementation of such innovative technologies as air-cooled Ku-band air-traffic control magnetrons, split accelerating structure fabrication technique, and solid-state Marx modulators. In this talk, we present the design and test results of a 2 MeV Ku-band electron linac for a hand-portable X-ray generator system for field radiography, being developed by RadiaBeam.