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Manual_XRaySource

Mg K alpha X-Ray Source new nook

Twin anode Mg-Al XR3 X-RAY SOURCE (Thermo Fisher scientific). 

Dimension completely retracted. From the flange to the ending part of the source=22.5 cm
Linear transfer: it can be moved by 7.5 cm
Distance from the CF38 flange of the chamber to the center of the chamber (sample)=30 cm (sample at 20, 20)
Working distance of the X-Ray source from 1 to 2 cm from the sample
This means that the linear tranfer has to be moved by 5.5 cm

Be careful when the X-ray source is inside and you need to rotate or move the sample because they are very close to each other!
PRECAUTIONS: All windows should be completely covered with lead glasses or lead screens before operating the source.

DEGASSING PROCEDURE: Please see Manual pag 34

1) Open water flux IN and OUT (pressure between 4 and 5.7 bar)
2) Switch on the powersupply 
3) Run THERMO ADVANTAGE software (Login in PBACH5 as Vgengineer and close Advantage in other accounts if opened there)

4) Select Insert x-ray mode-->Select gun: twin anode x-ray gun; Select power: Mg 300W BACH
Menu Instrument select: X-Ray Gun Control:

gun: twin anode x-ray gun; Power: Degas
Press Details...XR4Gun Diagnosis will appear
Starting Conditions:
HT Voltage=0

Fil cure limit=0
Power 0
beam current 0 mA
fil cure limit 0

3) Water Cooling: 4.2 BARS
4) Switch on the power supply
5) Set beam current 4.5 mA and click APPLY

6) Anode type: Mg
7) FILAMENT DEGASSING: 
Set filament current 0.1,.....1.2A,1.3 A keeping pressure<5x10-9mbar....

 

OPERATING X RAY SOURCE

1) Login in PBACH5 as Vgengineer and run THERMO ADVANTAGE software (close Advantage in other accounts if opened there)
2) Select Insert x-ray mode-->Select gun: twin anode x-ray gun; Select power: Mg 300W BACH

3)Menu Instrument select: X-Ray Gun Control:
gun: twin anode x-ray gun; Power: Mg 300W BACH
Press Details...XR4Gun Diagnosis will appear
Starting Conditions:
Set all values to zero and press APPLY: HT Voltage=0, 
Fil cure limit=0, Power 0
beam current SET: 5 mA  and click APPLY
fil cure limit SET 0.5 A, 1 A, 1.5 A, …4.2A (Mg has been degassed up to 4.8 A but not necessary to reach 4.8 A during normal operation)

Then:

HT Voltage: (steps 0.1 kV when you degas) 1KV, 3kV, …15kV

At the end: Set Beamcurrent 20 mA

 

SWITCHING OFF X-RAY GUN:

To switch off go down with the same procedure (exactly opposite direction, last action will be close water flux)
In the software, when everything is zero press Turn OFF in XR4 Gun Diagnostics and Shut Down in the panel X-Ray Gun Control.

Last Updated on Tuesday, 08 July 2014 14:21