Differences

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--- e-beam_evaporator [2025/06/13 13:54] – wigbout
+++ e-beam_evaporator [2025/06/13 13:54] (current) – [Aftermath] wigbout
@@ Line 235: / Line 235: @@
   - The conditioning of the Nb.
-== Conditioning the chamber: ==
+=== Conditioning the chamber: ===
 Evaporate a getter-material, such as Nb or Ti. These materials bond with dirt and oxygen in the chamber and end up sticking to the walls, improving pressure after pumping down again. The aim is to achieve e-9 to 1e-8 chamber base pressure..
@@ Line 241: / Line 241: @@
 By evaporating 5 - 10 nm of getter-material, and waiting for one hour, the chamber pressure will decrease. The aim is to achieve ~1e-8 or ~5e-9 mbar. In the first step, after some time, the getter will stop working as efficiently as in the beginning. So, when the pressure is stabilized, one can evaporate more.
-== Conditioning Nb: ==
+=== Conditioning Nb: ===
 There is still a lot of dirt in Nb after melting. This can be seen if there is a good base pressure but a very bad Nb evaporation pressure. To solve this, we evaporate a lot of Nb the get rid of the impurities. This has the double effect of also conditioning the chamber.