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Gun vacuum
In the gun head is a ultra high vacuum, which is maintained by two ion getter pumps (
2
).
The vacuum in the gun head is called ’Gun vacuum’. It should be well below 1 x 10
-8
mbar.
The specimen is located in the evacuated specimen chamber (
3
). To open the specimen chamber
for specimen exchange, you have to break the vacuum in a controlled manner. This is done by
the
Vent
command via the SmartSEM
®
user interface or by pressing the
Exchange
push button
on the optional control panel.
Ventilating
When receiving the
Vent
command, the column chamber valve closes and gaseous nitrogen
flows into the specimen chamber via the vent valve (
7
). As soon as the pressure equilibrium is
obtained, the chamber door can be opened to change the specimen.
Evacuating
In order to continue operation, the
Pump
command makes pre-vacuum pump and turbo pump
evacuate the specimen chamber.
As soon as the vacuum in the specimen chamber is ready for operation, the column chamber
valve opens and the ’EHT Vac ready’ message appears in the SmartSEM
®
user interface. Gun
and EHT can be switched on.
Quiet Mode
The automatically controlled
Quiet Mode
is optionally available.
This option allows switching off the pre-vacuum pump after specimen exchange when the vacuum
threshold is achieved.
3.4.2. Specimen stage
Standard specimen stage is a 6-axes motorised super-eucentric stage that is controlled by the
SmartSEM
®
software. The stage can be operated by the dual joystick controller or by using the
soft joystick in the SmartSEM
®
user interface.
The axes are called:
The stage is an eucentric one, which means that all rotation axes intersect in the same point. The
specimen surface is located in the eucentric point, where the tilt axis meets the beam axis. This
guarantees that the focus is maintained when the specimen is tilted at a certain working distance.
When moving a tilted specimen, the specimen is also moved unintentionally in Z direction. The
selected feature moves out of view. The so-called super-eucentric stage is equipped with the M-
axis, which allows you to move the specimen surface into the tilting plane with the result that a
selected feature stays in view and in focus when the stage is tilted at various working distances.
X
X-axis
Y
Y-axis
Z
Height
M
Height (eucentric)
R
Rotation
T
Tilt
Содержание AURIGA Compact Crossbeam
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