The slit box is located after the monochromatic beam attenuators and bolted on the experimental table. It is in fact two pairs of horizontal and vertical slits separated by a gap of 200 mm. The slits are made of Tungsten carbide (type 6 UF) and are 2 mm thick the edge is cut with a 2 degrees angle like a knife blade. The slit box has been prealigned manually to have beam going through two holes of 0.5 mm at the entrance and the exit of the box.

 

ID23_eh1_slitbox_photos.gif

 

The fine alignement of the slits is then done by using the horizontal (t1h and t2h) and vertical(t1v and t2v) stages which have +/- 7mm translation range (stepper motor 0.15 micron per half step). The size of the beam is defined by changing the gap of the slits horizontally (s1h and s2h) and vertically (s1v and s2v). The second pair is added to cut off side scattering coming from the first set of slits. The maximum aperture is 6 mm by 6 mm (stepper motor 0.4 micron per half step).

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