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8
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ME12044A
5.2
Adjustment of Optical Axes
The optical-axis adjustment slit is designed so that it will be positioned at the center of rotation of the
monochromator, with a width of 0.05 mm. The effective focal size of the X-ray is 0.06 mm with
take-off angle of six degrees. The optical system is designed in such a manner that it will deliver
precise data when it is adjusted so that the three points of the X-ray source, the divergence-slit center,
and the optical-axis adjustment slit are aligned in straight away. As the positions of the divergence slit
and optical-axis adjustment slit are adjusted mechanically with high accuracy, the above condition must
be satisfied by changing the position of the X-ray source, specifically that of the X-ray tube.
5.2.1
Setup of the divergence slit (DS)
First, the XG is set to 10 kV-10 mA, and then the divergence slit is set to 0.05 mm using the
control software. Select “init” and click on [OK] to activate the initialization. Enter the value of
0.05, select “move,” and click on [OK] (Figure 5.6).
Figure 5.6 DS Setup Screen
5.2.2
Model with a direct-beam monitor
Open the shutter
(Note)
, and observe the deflection of the needle of the direct-beam monitor. If no
deflection is observed, turn up the gain. If the needle does not deflect even when the gain has been
turned up, increase the X-ray load (turn up the X-ray tube voltage or tube current).
When the deflection of the needle has been confirmed, loosen the fixing screw and adjust the
position of the X-ray source using the X-ray-tube adjustment knob. Set the knob to a point at which
the deflection of the needle is at its maximum. Once the position of the tube has been established,
fasten the screw securely.
This completes the adjustment of the optical axes. Remove the optical-axis adjustment slit, and
re-install the monochromator.
Figure 5.7 X-ray-tube Adjustment Knob (D010524A09)
Note: If the shutter is to be opened, the radiation enclosure must always remain closed.
Adjustment Knob
Fixing Screw
