Electron microscopy
Water Cooling in EMs
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   https://www.globalsino.com/EM/        

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.


The coil of wire that forms the lenses in EMs is shielded from external magnetic fields and cooled by refrigerated water. Figure 3318 shows the schematic illustration of top-entry specimen stage together with the top-entry lens. The location of cooling water is also indicated.

top-entry specimen stage together with the top-entry lens
Figure 3318. Schematic illustration of top-entry specimen stage together with the top-entry lens.

If the GIF stops working some time after it is turned on, then we need to do the troubleshooting as follows:
         i) The GIF lenses may be or had been overheating so that the protection circuitry shut the lenses off. In this case, we need to check the water cooling. The flow indicator should be set to 0.05 gallons (0.19 liters) per minute. Furthermore, to verify that the water-flow indicator is not stuck at a reading, we can adjust the regulator valve to see if the flow rate changes or not.
         ii) The fan in the Gatan Instrumentation Bin (GIB) is running.
         iii) Once we made sure the cooling is back to working correctly, the DigitalMicrograph interface (or plus the PC) needs to be restarted in order to turn the lenses back on.
         iv) Measure the power supply voltages at the test points either on the back or inside the GIB. They should be within 10% of the values listed in the GIF user manual.



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