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Monochromated X-Ray Source with XR5 Electron Gun
5.6
Anode Cap Cleaning
This is required if the anode shows signs of binding during use of the linear motion
drive.
Refer to Figure 5-4 and Figure 5-8.
1.
The lens assembly must be removed from the vacuum housing (follow Lens
Removal procedure)
2.
Inspect the anode-location bore-hole for any debris adhering to the bore walls.
The bore is coated with a solid lubricant. If this has been abraded the anode cap
should be exchanged for a reconditioned one.
3.
Unscrew the 2-off M3 x 25 and 1-off M3 x 12 cap head screws and withdraw the
anode-cap.
4.
Fit the replacement and refit the clamp screws. The orientation of the anode-cap
will have to be checked by refitting the lens assembly in the vacuum housing
and inserting the anode without bolting the anode vacuum flange. The anode
flange should be naturally aligned with its mating flange. If any force is needed
to achieve this alignment, note the direction of displacement, remove the lens
assembly, score the anode-cap and its mounting-base to identify its initial
orientation and then loosen the 3-off M3 screws to allow a suitable rotational
adjustment. Repeat this alignment test procedure until satisfactory alignment is
attained.
5.
Refit the gun components in reverse order to the removal procedures.
6.
Pump down and bake the system before use.
5.7
Ceramic Replacement
Replacement or cleaning of ceramics is required if HT ticks become a problem. Since
this job requires total disassembly of the gun, and re-assembly requires the use of
special alignment jigs, it is recommended that this be done by qualified service
engineers.
5.8
Crystal Maintenance
The crystals should require no maintenance by the customer.
Issue 5
27
Monochromator and XR5 (HA600054)
Monochromated X-Ray Source with XR5 Electron Gun
5.9
Fault Finding
Symptom
General
Specific
Cause
Cause
The gun will
Insufficient water
Mains / re-
not start when
flow.
circulated water
an attempt is
Warning
supply switched off.
made to
message on
switch on from
datasystem.
datasystem.
Water flow not
sufficient to satisfy
flow requirement
Cover on anode
Twin anode cover
not in place,
not in place.
tripping interlock.
Warning
Mono anode cover
message on
not in place.
datasystem.
Mono anode lemo
connector not
connected
Cable not in
XR5 connector not
place, tripping
in place
interlock.
Warning
message on
datasystem.
The gun trips out at 15KV.
Water electrical
Warning message on data system
impedance too low.
relating to water impedance.
Complete
Mono gun not
Has not been
loss of XPS
switched on
switched on.
signal
A HT tick has
corrupted the
power supply
settings.
A problem relating
Various
to the analyser /
detection rather
than the mono gun.
Mono spots and
Height of sample is
analysis position
wrong.
not coincident.
Crystal
manipulators have
been moved.
Monochromator and XR5 (HA600054)
28
How to Rectify
How to Fix
Booster pump will make
Switch on
excessive noise. Check
supply.
supply.
Look for warning messages on
datasystem.
Check inlet and outlet flow.
Set pressure
Look for warning messages on
flow
datasystem.
requirements as
specified in the
site preparation
guide.
Check cover in position.
Re-position
Check cover in position.
Re-position
Check it is connected.
Re-connect
Check connector in place.
Re-connect
Run at a 10KV mode and
Replace
observe the readback of the
recirculator
leakage value in "Expert
water. Change
Mode". The current should be
water supply.
less than 20mA to avoid a trip,
so should be less than 12mA
at 10KV.
Check on datasystem
Switch on
Readback settings can be
Stop and restart
seen in "Expert Mode", this
mono gun.
should follow the set values.
Check for signal using another
Fix as required.
source.
Check height of sample on
Adjust height
CCD camera image.
Check that the position of the
Adjust to obtain
mono spots coincident with the
coincident
CCD image using a phosphor
position.
sample.
Issue 5
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