BNL: Y. Lee, D. Raparia, J. Wei
LANL: J. Billen, R. Hardekopf, S. Nath, M. Plum, A. Regan, L. Young
LBNL:
Jlab:
ORNL: S. Alexandrov, P. Chu, S. Cousineau, S. Danilov, G. Dotson, M. Gianella, J. Galambos, S. Henderson, J. Holmes, D. Jeon, Y. Kang, S. Kim, L. Kravchuk, H. Ma, T. Pelaia, A. Shishlo, E. Snow, J. Stovall, E. Tanke
Jie Wei participated on an accelerator physics review of this 1.3 billion dollar Japanese accelerator design. The facility, scheduled for completion in 2006, will include a 400 MeV linac followed by 3 and 50 GeV synchrotrons operating at 1 and 0.75 MW power, respectively. The front end has already transported beam, and the need for cesium in the source is under study. The LEBT is long and electromagnetic, and there are choppers in both the LEBT and MEBT. The linac is warm, consists of three sections, and contains a 300-900 MHz frequency jump. The HEBT is used for momentum collimation and, due to high dispersion values, requires tight momentum control. The collimation section is 30 m long with lots of concrete, and 98% collimation efficiency is claimed. In order to avoid crossing transition, the 50 GeV synchrotron has a complicated lattice. Committee recommendations include: make LEBT chopper faster and study possibility of eliminating MEBT chopper, watch matching from fodo to doublet lattice in linac, and simplify RCS lattice.
Tuning of the DTL shows dB/B ~ 1% at present, reproducible to several tenths of a percent. Present goal is to stabilize the results and then proceed to fine tuning. Tank 3 of the DTL is being shipped to RATS and set up there.