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.

The ongoing multi-user upgrade of the superconducting ion linac, ATLAS at Argonne, will enable simultaneous acceleration and delivery of two different ion beams to different experimental areas. In the initial phase, one stable, nearly continuous wave, beam from the ECR ion source and one pulsed radioactive beam from the EBIS charge breeder of nuCARIBU will be interleaved in time via an electrostatic deflector at injection and accelerated through the first two sections of the linac. At that point, one of the beams is deflected via a pulsed switching magnet to a lower energy experimental area while the other is sent for further acceleration in the third section of the linac and delivered to a higher energy experimental area. In addition to enhancing the nuclear physics program at ATLAS, this upgrade will also increase the availability of beam time for some applications. While the construction and installation of the new pulsed injection beamline is now complete, there has been a change in the design of the extraction beamline. The original chicane designed to bypass the existing 40-deg bend has been removed, and the existing beamline was modified to incorporate the kicker and septum as the only required magnets. Details of the final design and progress made will be presented.