FRIB, East Lansing, Michigan, USA
The Facility for Rare Isotope Beams (FRIB) will utilize a powerful, superconducting heavy-ion driver linac to provide stable ion beams from protons to uranium, at energies of > 200 MeV/u at a beam power of up to 400 kW. ECR ion sources installed above ground will be used to provide highly charged ions, that will be transported into the linac tunnel approx. 10 m below ground. For the heaviest ions, two charge states will be accelerated to about 0.5 MeV/u using a room-temperature 80.5 MHz RFQ and injected into a superconducting cw linac, consisting of 112 quarter-wave (80.5 MHz) and 229 half-wavelength (322 MHz) cavities, installed inside 52 cryomodules operating at 2K. A single stripper section will be located at about 17 MeV/u (for uranium). Transverse focusing along the linac will be achieved by 9 T superconducting solenoids within the same cryostat as the superconducting rf accelerating structures. This paper describes the matured linac design, as the project is progressing towards a Department of Energy performance baseline definition in 2012. Development status of the linac subcomponents are presented with emphasis on the superconducting RF components.
FRIB, East Lansing, Michigan, USA
The Michigan State University (MSU) Superconducting Radio Frequency (SRF) cavity processing and coldmass assembly infrastructure is being upgraded to meet the production needs of multiple SRF projects, including the driver linac for the Facility for Rare Isotope Beams and the MSU Reaccelerator. The objective is to modify the current infrastructure to increase throughput and optimize the process workflow, while minimizing impact to the overall preproduction schedule. Facility upgrades include a cleanroom addition, chemistry room addition, part etching lab, cleanroom preparation area, and a new ultra pure water system. New handling fixtures and specialized tools are being implemented. Methods are being developed to streamline the workflow, increase repeatability, enhance process safety and reduce cross contamination and waste. The proposed work center layout, process capabilities, optimized workflow strategies, and plans for continuous improvement will be presented.