Date:21-07-2009   |   【Print】 【close

RIBLL II, the second Radioactive Ion Beam Line at Lanzhou, is one of the parts of the beam transport line between CSRm and CSRe. It is designed to operate at a higher energy with the maximum magnetic rigidity of 10.64 Tm. The separator of RIBLL II, which consists of two dipoles and ten quadruples, is a mirror-symmetric system, achieving a point-point and parallel-parallel image at its intermediate focal plane with maximum position dispersion. The double achromatism of D = D' = 0 is automatically realized at the final focal plane. Its esolving power of magnetic rigidity is 1200 at the momentum deviation of ΔP/P = ±1% and the divergence of ±25 mrad.

The following part is almost a copy of the separator to further purify RIB. The total length of RIBLL II is about 55m. And its ion optics is optimized to a third order in order to obtain high realistic resolving power and to minimize the emittance growth.