August 2023
Beginner
128 pages
5h 43m
English
Content preview from Make: Volume 86
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EXT255H turbomolecular pump. The system
was pumped down until the ion gauge indicated
10
-
⁵ millibar. I heated the tube with a propane
torch to drive out as much water as possible and
then used a benchtop power supply to heat the
filament for several minutes to drive out oxygen
in the wire (Figure
E
).
6. SEAL THE TUBE
The neck of the tube was heated with a MAPP
torch and carefully allowed to collapse in, sealing
the tube (Figure
F
). Concentrated heat and a
twisting motion ensured that the end of the tube
was securely sealed.
7. ACTIVATE THE GETTER
The getter that was installed earlier is activated
by heating with an induction heater (Figure
G
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