Thermo Scientific ESCALAB 250 Manual

Monochromated X-Ray
Source with XR5
Electron Gun
Document Number HA600054
Issue 5 (02/07)
Monochromated X-Ray Source with XR5 Electron Gun
1 Contents
1 Contents ......................................................................................................2
1.1 Figures .......................................................................................................... 3
1.2 Tables ........................................................................................................... 3
2 Introduction .................................................................................................4
2.1 What You Should Have Already Read .......................................................... 4
2.2 Getting Help .................................................................................................. 4
2.3 Health and Safety.......................................................................................... 5
2.3.1 Safety Warnings: ESSENTIAL READING........................................................ 5
2.3.2 Safety Interlocks............................................................................................... 5
3 Description ..................................................................................................8
3.1 Introduction ................................................................................................... 8
3.2 XR5 Electrostatic Electron Gun..................................................................... 9
3.2.1 Cathode............................................................................................................ 9
3.2.2 Anode............................................................................................................... 9
3.3 Water Cooling Circuit .................................................................................. 10
3.4 Monochromator Crystal Assembly .............................................................. 10
3.5 Moving the XR5 Anode ............................................................................... 12
3.6 Monochromator Fine Tuning ....................................................................... 12
3.6.1 Alignment of the Analysis Centre and Microscope Cross Hairs..................... 12
3.7 T352/NT Computer-Controlled Power Supply ............................................. 14
4 Monochromator Operation ......................................................................15
Avantage Data System Monochromator Controls ....................................... 15
4.1
4.1.1 Errors and Warnings ...................................................................................... 16
4.2 Different XR5 Operating Modes .................................................................. 16
4.3 Switching on the Re-circulated Water ......................................................... 17
4.4 Observing the Monochromator Spot ........................................................... 17
4.5 Limits of Operation ...................................................................................... 18
5 Maintenance ..............................................................................................19
5.1 Degassing - after a System Vent and Bake ................................................ 19
5.2 Re-alignment after a Bake .......................................................................... 19
5.3 Anode Maintenance .................................................................................... 21
5.4 Replacing Anodes ....................................................................................... 22
5.5 Replacing Filaments/Cathodes ................................................................... 23
5.6 Anode Cap Cleaning ................................................................................... 27
5.7 Ceramic Replacement................................................................................. 27
5.8 Crystal Maintenance ................................................................................... 27
5.9 Fault Finding ............................................................................................... 28
5.10 Fuses Information - for Service Engineers ................................................. 29
6 Index...........................................................................................................30
Monochromator and XR5 (HA600054)
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Issue 5