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venting_pumping_object_box [2018/04/25 17:43] pereira [Vent Object chamber] |
venting_pumping_object_box [2023/06/02 17:14] swartzj |
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===== Vent Object chamber ===== | ===== Vent Object chamber ===== | ||
- | Requirements: | ||
- | * Open **S800Vac** and go to page 01 (" | + | From the S800 Main Vacuum page, go to the Object chamber |
- | * Verify that OBJ SCI is not biased: | + | * Before you start, make sure that the gate valves |
- | * Check that the detectors is unbiased | + | * The vent valve should |
- | * Notify the system | + | * The valve to the turbo pump TVG should |
- | * Isolate chamber by closing | + | |
- | * [[Vacuum control|Turn | + | The procedure is then as follows: |
- | * Check box " | + | - Close the valve to the roughing pump RV. |
- | {{: | + | - Now you can plot the pressure vs time at BPG to monitor the pressure before you open the vent valve. |
- | * In order to begin venting process, select box "VENT STATUS" | + | - **Keep a constant eye on the pressure level** as it increases rapidly. When it approaches 800 torr, **it is imperative that you close the venting |
- | * Box "VENT STATUS" | + | - You can now enter and open the chamber. |
- | * Turbo gate valve **I188GV** will be automatically closed | + | |
- | | + | ===== Pumping Object chamber ===== |
- | * Go to the S800 OBJ station | + | |
- | * When **I191PG** reads atmospheric pressure select | + | From S800 Vacuum Main Page, go to Object chamber page. This will open the page in the figure below. |
- | * The status in the box "VENT STATUS" | + | |
- | * Close the manual | + | |
- | * You can now open the chamber | + | * Close FV and open RV to start pumping down the object chamber with the roughing pump. You can make a plot of the pressure |
+ | * Section D2337 will initially be red with vacuum status: 'Bad vacuum' | ||
+ | * Wait until the vacuum reading at FPG to drops to below 200 mTorr before you can safely turn on the turbo pump. | ||
+ | * After turning on the turbo pump, wait for the inner circle of the pump symbol to turn green and the pump to reach 40 000 rpm before you open the valve at TGV. | ||
+ | * When the pressure decreases to below 10-3 Torr, you should see the pressure bottom out on your BPG plot, you can turn on the IG and also plot its pressure over time. Section D2337 should turn green and the vacuum status should turn to 'Good vacuum' | ||
+ | {{ : | ||
- | {{: |