Monochromated X-Ray Source with XR5 Electron Gun
Issue 5
Monochromator and XR5 (HA600054)
15
4 Monochromator
Operation
The ESCALAB 250 small spot monochromator is entirely computer controlled. Once
the monochromator has been degassed all the operator has to do is select the pre-set
monochromator conditions required and the
Avantage
data system does the rest.
This document covers basic operation of the monochromator, i.e. turning it on and off
and selecting pre-set conditions. For full details on the Monochromator operation refer
to the
Avantage
on-line manual.
4.1
Avantage
Data System Monochromator Controls
The 'X-Ray Control' is addressed by inserting a
“Source Object”
in the
“Experiment
Tree”
, shown selected in Figure 4-1 may also be assessed from
“Instruments”
tab
but normal operation is through inserting an experiment object.
Figure 4-1:
Avantage
Properties Book
Selection of the Monochromator source
“Mono X-ray Gun”
opens the
“Control
Properties Book”
which provides a menu of stored operating conditions for the Mono
Source. A
“Details”
button opens a window displaying all the control parameters.
The Control Properties Book permits the user to select preset operating conditions
where most of the operating conditions have already been determined and the
operator has only a few basic decisions to make before starting the source.
Gun control is via a simple Control tab
(
X-Ray mode
)
, an example of which is shown
in Figure 4-2
Figure 4-2: Control Properties Book
Clicking on the
Spot/Power
drop down list presents the user with a number of
predefined power and spot size settings. Once an appropriate
Beam Size
has been
chosen the
Apply
button should then be selected.
Monochromated X-Ray Source with XR5 Electron Gun
Monochromator and XR5 (HA600054)
Issue 5
16
4.1.1
Errors and Warnings
As the monochromator is ramping up to the desired operating point the data system
will check for any problems and report these as a warning window.
If an Error does occur, the data system will display a warning dialogue and instruct the
operator in what to do next.
Occasionally ‘pop up’ warning messages will appear. After taking note of the message
select the OK button. Go into the “Details” window and look at the
Trips / Interlocks
,
you will see a red
Fail
in the appropriate window. You will need to take the appropriate
action to resolve the problem before setting the
Reset
button (see Figure 4-3).
Figure 4-3: Water flow fail light within the Trips
4.2
Different XR5 Operating Modes
There are in total up to 20 pre-set operating modes. 11 of these have been assigned
to different stages of degas and are therefore not used during normal operating
conditions. These are discussed further in the maintenance section of this manual. A
typical set of user modes follows, although individual cases may be tailored to
individual systems or customers requirements
Standby -500
P
m [10kV 60W]
Default -120
P
m [15kV 22W]
Default -150
P
m [15kV 30W]
Default -200
P
m [15kV 45W]
Default -250
P
m [15kV 55W]
Default -320
P
m [15kV 75W]
Default -400
P
m [15kV 100W]
Default -500
P
m [15kV 150W]
Default -650
P
m [15kV 200W]
DEGAS_1-Keep_P_below_1e-7mb (10 min)
DEGAS_2-Keep_P_below_1e-7mb (10 min)
DEGAS_3-Keep_P_below_1e-7mb (20 min)
DEGAS_4-Keep_P_below_1e-7mb (1hr)
DEGAS_5-Keep_P_below_1e-7mb (10 min)
DEGAS_6-Keep_P_below_1e-7mb (20 min)
DEGAS_7-Keep_P_below_1e-7mb (1hr)
DEGAS_8-Keep_P_below_1e-7mb (10hr)
DEGAS_9-Keep_P_below_1e-7mb (1hr)
DEGAS_10-Keep_P_below_1e-7mb (1hr)
DEGAS_Large_spot [10kV 100W]
Table 3: Typical Example Set of User Modes
