JJ X-ray offer white beam slits both for synchrotrons and FELs. The drive mechanism is a stiff and highly guided design that can accommodate both synchrotron and FEL blades, see Figure 1. Generally, the white beam slits are designed to have fully overlapping blades and to have individual control of each blade. The chambers, and the support thereof, are made such that an ion-pump can be directly mounted on the slit. Further there are ports for gauges, right-angle vales, RGA and what else may be required.
The motion of the arms have a measured resolution of < 200 nm, a open loop repeatability of < 2 µm and an open loop accuracy of < 3 µm.
The synchrotron white beam blades can absorb up to 1500W when electron drain current readings are mandated. If the drain current capability can be omitted, then the blades can absorb 4000W. The white beam blades are typically made from a Cu alloy, for heat absorption, and a heavy element for beam definition. The beam defining entity can be any of our slit blades including: nano-polished rods, knife-edges, single crystals and multilayers. Figure 2 shows white beam synchrotron blades.
The FEL white beam blades can absorb up to 800W. The beam defining entity is a multilayered structure with light elements upstream, the first typically being diamond or graphite, and progressively heavier elements as the beam moves downstream through the structure. Figure 3 shows a white beam FEL blade assembly.
Figure 1 Synchrotron white beam slits where the vertical and horizontal blades are separated into individual chambers
Figure 2 Synchrotron white beam slit blades (note that the shown blades do not offer drain current readings)
Figure 3 FEL slit blade assembly