BNL: A. Fedotov, Y. Lee, H. Ludewig, D. Raparia, J. Wei
LANL:
LBNL: R. Keller, J. Staples
Jlab: G. Krafft
ORNL: S. Alexandrov, P. Chu, S. Cousineau, S. Danilov, M. Doleans, G. Dotson, J. Galambos, S. Henderson, J. Holmes, D. Jeon, S. Kim, L. Kravchuk, T. Pelaia, Y. Sato, A. Shishlo, C. Sibley
1) Optimization of piezo compensation - M. Doleans
2) Fault analysis for MEBT chopper target - S. Kim
3) Collimator shielding calculations - H. Ludewig
The cross section of the primary collimator tube consists of two different ellipses joined by a complicated transition. The cost of such a collimator tube is estimated to be in the range $(200-230)K. If the primary collimator cross section could be simplified to a single ellipse, then the estimated cost would be reduced to $(100-110)K. MCNPX studies for a single cross section collimator showed a 25% increase in doses to the downstream doublet, which would result in a decrease in the magnet lifetime from 20 to 15 years due to radiation damage to the insulation. Based on these tradeoffs, it is recommended to go with the single cross section collimator and make sure that the downstream magnets can be easily replaced.