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8.3. Column
8.3.1. Baking out the gun head
The pumping capacity of the ion getter pump decreases in the course of time, thus deteriorating
the ’Gun vacuum’. This can be remedied by an ion getter pump bakeout as a regular maintenance
procedure.
Prerequisite
•
Only advanced operators are allowed to perform the bakeout procedure.
•
Baking out requires
Supervisor
privilege and user access level
Service
.
Procedure
1
Switch off the gun:
a
In the status bar, click
Gun
.
b
On the pop-up menu, select
Shutdown Gun
.
2
Wait until the Gun has ramped down.
3
On the menu,select
Tools/Goto panel
.
The
Panel Configuration Bar
opens.
4
Double-click
Bakeout
.
The
Bakeout
dialog is shown.
5
If the
Full service bakeout
checkbox is avail-
able, disable the
Full service bakeout
check-
box.
Full service bakeout includes column heating
that may lead to column misalignment.
6
In the drop-down list, select one of the different
bakeout cycles:
Quick
: 2 hours heating / 1.5 hours cooling
Overnight
: 8 hours heating / 1.5 hours cooling
Weekend
: 43 hours heating / 7 hours cooling
User
: To be defined by the operator.
CAUTION
Risk of injury from hot surfaces during bakeout
Parts of the enclosure in the upper range of the column may become hot during bakeout,
particularly after a long bakeout cycle.
Do not touch any parts of the cover panel and do not place any combustible objects on the
electron optical column.
Содержание Crossbeam 340
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