| AVS 64th International Symposium & Exhibition | |
| Vacuum Technology Division | Thursday Sessions |
| Session VT-ThA |
| Session: | Surface Science for Accelerators |
| Presenter: | Jason Carter, Argonne National Laboratory |
| Correspondent: | Click to Email |
As the APS Upgrade project continues in its preliminary design phase the APS-U storage ring vacuum system plans continue to mature while ongoing R&D activities and analysis are validating and strengthening the design. The storage ring magnets and structural support designs constrain the system to have narrow aperture vacuum chamber dimensions and limit allowable UHV pumping elements and locations. Monte-Carlo vacuum system analysis has indicated that the pressures and performance should meet requirements during and after accelerator commissioning. The margin of error for analysis must be better understood so a number of ongoing R&D efforts are helping to better predict and improve the performance.
A 28 meter length full sector vacuum system mockup will be installed in Fall 2017 and will include prototype vacuum chambers and all pumping elements. A sector mockup vacuum test plan will be presented which examines pumping speeds, outgassing rates, and the pumping conductance. NEG coating performance will be key to APS-U vacuum success and prototypes and further analysis are helping evaluate current coating plans and the option of adding more coatings. Finally, R&D proposals are progressing to measure photon stimulated desorption from APS-U style chamber designs.