D2 PHASER User Manual
DOC-M88-EXX141 V5 – 01.2015 7
(cut corner) which indicates the edge to which the slit edges are precisely adjusted ((b) in fig. 31).
Insert the slit modules in the orientation as shown in fig. 31 and fig. 33. The slit modules are fixed
magnetically (fig. 30) in the slit holder. Please insert the slit modules always in such a way that the cut
corner is positioned towards the magnets within the slit holder. The labeling has to be visible. The slit
module contacts the support pins, this guarantees that the slit is parallel to the goniometer axis.
K filter module
A K filter (for LYNXEYE fig. 32 and for 0D-scintillation detector (c) in fig. 24) should be used for
suppressing the characteristic K
radiation. Its position is in the slit module holder of the LYNXEYE ((a)
or (b) in fig. 34) or in the secondary slit system for the 0D-detector ((c) in fig. 24); for the XFlash
detector no K
filter is necessary.The filter material depends on the type of characteristic radiation.
The following list shows the various filters for attenuating the K
line.
radiation
K
K-filter
material
Cu Ni
Cr V
Co Fe
Absorber module
One Cu absorber module may be inserted into its position of the secondary slit holder (scintillation
counter and XFlash detector: (b) in fig. 21 and (c) in fig. 24, LYNXEYE: (a) or (b) in fig. 28) for pulse
rate reduction at the detector during adjustment work with the direct beam. Detector counting rates for
scintillation counters and XFlash detectors should be not more than 1x10
5
cps to 2x10
5
cps at the
maximum to reduce counting losses and pile-up events. Fig. 38 shows the position of an absorber
module for LYNXEYE detectors.
There is another absorber module ((a) in fig. 30) which stops the primary beam in order to protect the
detector. This absorber module is mounted with two screws on the right hand side of the rotation
sample holder and can be removed for alignment purposes (reference determination). Caution: The
XFlash detector will be damaged if hit by the direct beam!
Soller slit module
Axial Soller slit modules (fig. 20) in primary (fig. 18) and secondary position ((d) in fig. 35) reduce the
divergence of the radiation in axial direction and improve the resolution. The angular size of the
primary Soller must fit with the secondary one to get optimum resolution. Construction of primary and
secondary Soller slit modules ((a) and (b) in fig. 25) are identical for 0D-detector systems (scintillation
counter and XFlash detector). These Soller slit modules differ from LYNXEYE Soller slit modules (fig.
36 and (a) in fig. 26). Insert this Soller slit module as shown in fig. 37.
Follow this procedure to change the primary Soller slit module. Locate the lid of the primary Soller slit
holder (fig. 136) and remove the 4 screws with a Torx screwdriver 08 x 60. Remove the Soller slit
module carefully (fig. 137). It is held by a spring loaded ball (fig. 137). Insert the new one carefully and
put the lid back again on the holder and fix it with the four screws.
Airscatter screen modules
The airscatter screen module (fig. 39 for standard rotation sample holder) has two edges with different
distances to the sample surface (fig. 44) with a < b. The airscatter screen modules for the sample
To Next Page
Loading...
