Pre-Separator
The Pre-Separator must be capable of focusing beams up to the magnetic rigidity of 20Tm.
In the figure 1, the beam plot with 3rd-order ion-optics of the Pre-Separator is shown.
The table below gives the calculated 1st-order transfer matrix elements at the focal planes in the Pre-Separator. The linear dimensions x and y are in meters, the angles a and b in radians, and the momentum deviation d as a fraction of the nominal (reference) value. The “path length” is from the Super-FRS target.
1st-order transfer matrix elements at the focal planes in the Pre-Separator
Matrix element | FPF1 | FPF2 | FPF3 | FPF4 |
(x,x) | -2.94 | 1.72 | -2.75 | 2.00 |
(x,a) | 0.03 | |||
(x,d) | 4.39 | -2.58 | 4.07 | |
(a,a) | -0.34 | 0.58 | -0.37 | 0.50 |
(a,d) | 0.52 | 0.53 | ||
(y,y) | -5.65 | -2.07 | 4.23 | 1.52 |
(y,b) | 2.65 | -0.05 | -2.60 | 0.06 |
(b,b) | 0.01 | -0.46 | 0.03 | 0.57 |
Path length (m) | 22.00 | 35.60 | 49.34 | 71.50 |
In the figure below in the upper panel is shown calculated phase space in the dispersive middle focal plane of the Pre-Separator, FPF2, for a beam of three different momenta of ∆p/p = ±2.5 % without (red distributions) and with (blue distributions) correction of image aberrations by sextupole magnets. In the lower panel is presented corresponding angle-position phase space at the achromatic focal plane FPF4.
