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Vacuum-bakeout
Course: POL 3, Fall 2009School: Wisconsin Milwaukee
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system Vacuum bakeout Three Variacs (=variable transformers) are used to bake out the vacuum system. Use the STACO Power Source (Type 0332558) as Variac # 1 as it displays the output in voltage. Variac # Volt-/Percentage 1 34 Volt 2 3 52 % 62 % Bake-out area Turbo pump & HC gauge Manifold Tubing RTDs 1, 3 2, 5 4 Document the vacuum: HC = Torr, Ion = Torr. Turn off the Ion/HC...
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system Vacuum bakeout
Three Variacs (=variable transformers) are used to bake out the vacuum system. Use the STACO Power Source (Type 0332558) as Variac # 1 as it displays the output in voltage. Variac # Volt-/Percentage 1 34 Volt 2 3 52 % 62 % Bake-out area Turbo pump & HC gauge Manifold Tubing RTDs 1, 3 2, 5 4
Document the vacuum: HC = Torr, Ion = Torr. Turn off the Ion/HC gauge. Turn off the Ion pump. Detach the SRS RGA 100 (=Residual Gas Analyzer) from the system, as it must not be heated up. Detach the plug of the Hot Cathode (hot filament ionization gauge) for the same reason. Set the N2 and the He getter to 300oC. Set the Variacs to the above values. Start the program rtd_mac.vi on pol3he_daq in the folder Polarized_Target/Labview code/Cell Fill Production. Document the RTD Temperatures regularly: Channel # RTD # Heated area Temperature (oC) 0 1 Turbo pump 1 2 3 4 2 3 4 5 Cold Cathode gauge Ion gauge Gas system Calibrated volume
The maximum values for RTDs the are: Channel # RTD # Max. Temp. 0 1 100oC 1 2 3 4 2 3 4 5 150 200oC 100oC 200oC 150 200oC
These maximum temperatures are due to the manufacturing manual of the following vacuum devices:
Device Turbo pump CC (removed) Flowmeter Gas system
Max. Temp. 100oC 150oC 200oC 150 200oC
Device SRS RGA 100 Hot Cathode Piriani Gate valve
Max. Temp. 200oC 300oC 100oC 200oC
Bake out the vacuum system for approximately 24 hours.
After 24 hours (or more) of baking out: Turn of all Variacs. Set both getters to 0oC. Document the RTD temperatures.
When the temperatures are close to room tempe...
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