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venting_pumping_object_box [2018/04/25 17:28] pereira |
venting_pumping_object_box [2024/02/06 09:35] noji |
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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 |
- | * Verify that OBJ SCI is not biased: | + | |
- | * Check that the detectors is unbiased in the HV module sitting in dU6 | + | |
- | * Notify the system of the bias-off state by selecting the " | + | |
- | * Isolate | + | |
- | * [[Vacuum control|Turn off]] ion gauge **I188IG** | + | |
- | * Check box " | + | |
- | {{: | + | |
- | * In order to begin venting process, select box "VENT STATUS" | + | |
- | * Box "VENT STATUS" | + | |
- | * Turbo gate valve **I214GV** will be automatically closed and pressure | + | |
- | * When **I215PG** reads atmospheric pressure, select | + | |
- | | + | {{: |
- | * You can now open the chamber | + | |
+ | The vent valve should also be closed when you begin. Before you start venting, make sure of the following: | ||
+ | | ||
+ | * The IG is off | ||
+ | * The roughing valve RV is closed. | ||
+ | * The turbo pump gate valve TVG is closed. If the chamber will be vented for a long time, the turbo pump should | ||
+ | |||
+ | The venting procedure is as follows: | ||
+ | - Monitor the pressure RBT_BTS31: | ||
+ | - Open the vent valve | ||
+ | - When the pressure approaches ~800 Torr, close the venting valve. Failure | ||
+ | |||
+ | ===== Pumping Object chamber ===== | ||
+ | |||
+ | From S800 Vacuum Main Page, go to Object chamber page. This will open the page in the figure below. | ||
+ | * Make sure that the IG is off. | ||
+ | * When you start, you should have RV closed, FV closed and the TGV valve, Vent valve, as well as the gate valves named D2341 BGV and D2303 BGV all closed. | ||
+ | * Open RV to start pumping down the object chamber with the roughing pump. You can make a plot of the pressure vs time at BPG at this point. | ||
+ | * 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' | ||