BNL: D. Davino, A. Fedotov, Y. Lee, H. Ludewig, D. Raparia, J. Wei
LANL: R. Hardekopf, M. Plum, R. Shafer
LBNL: R. Keller, J. Staples
Jlab:
ORNL: S. Alexandrov, S. Assadi, E. Bjorkland, P. Chu, S. Cousineau, R. Cutler, S. Danilov, M. Dolean, M. Gianella, J. Galambos, S. Henderson, J. Holmes, D. Jeon, S. Kim, L. Kravchuk, T. Mann, D. Olsen, T. Pelaia, A. Shishlo, C. Sibley, J. Stovall, E. Tanke, J. Wang, M. White
A horizontal analysis shows that the RTBT flight tube violates the 300 pi mm-mr aperture limit and has a limiting aperture of 240 pi mm-mr. This has been modified, and the end of the flight tube is now at 300 pi mm-mr. Absorbers on either side of the proton beam window are limiting apertures. They are designed to take 10-20 kW beam power. The aperture in front of the window is a new addition. The RTBT collimator acceptance is 450 pi mm-mr, and it needs to be moved (~50 cm). There is still time to modify the design og this collimator.
There will be 8 active modes for user pulse types. Requirements for beam pulse scheduling are being formulated. Forward any ideas or requests to Coles Sibley.
Design tracking studies show that Collimator 2 must be elliptical to protect the doublet quads that follow. All other ring collimators can be circular withou impacting collimation efficiency. Cost impact of this is small (< ~$20K).
An analysis of the likely linac commissioning scenario predicts a worst case activation of the SC linac a factor of 4 below the safety limit. Activation should not be a problem during SC linac commissioning. Also, the energy corrector cavity will not be necessary during ring commissioning at 10^13 protons.