Mitigating the thermal challenges in carbon stripper: test bench simulation to enhance the device stability

The Facility for Rare Isotope Beams (FRIB) LINAC utilizes two stripper media: liquid lithium and carbon, the beam energy is 17-20 MeV/u. Thermal stress management in carbon strippers is crucial for improving the performance and durability of components. This study focuses on simulating the beam heating with a 460 nm laser beam as a heating source to evaluate its effect on a carbon foil and to guide design updates for use with high power heavy ion beams. The first objective is to measure the carbon foil's emissivity under controlled conditions, which is crucial for understanding thermal behavior and energy transfer. The laser beam has a predetermined intensity to accurately determine the foil's emissivity. Proposed design updates include replacing existing components with more durable metal gears, bearings, coating the inner walls with high-emissivity paint to improve thermal efficiency, and integrating a proximity sensor to monitor the rotational speed of the drive gear. These modifications are expected to optimize the measurements, which will consequently help improving the performance of the Carbon Stripper and ensure the longevity of the system under high-temperature conditions.