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venting_pumping_object_box [2018/04/25 17:43] pereira [Vent Object chamber] |
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 chamber |
- | * Verify that OBJ SCI is not biased: | + | |
- | * Check that the detectors is unbiased | + | {{:wiki:screenshot_from_2024-02-06_09-20-58.png|}} |
- | * Notify the system of the bias-off state by selecting the " | + | |
- | * Isolate chamber by closing gate valves **I177GV** and **I190GV** | + | The vent valve should also be closed when you begin. Before you start venting, |
- | * [[Vacuum control|Turn off]] ion gauge **I188IG** | + | * The beamline gate valves D2341 BGV and D2303 BGV are closed |
- | * Check box " | + | * The IG is off |
- | {{:wiki:objs800vac_pumped.jpg?500|S800vac Panel Mate}}. | + | |
- | * In order to begin venting | + | * The turbo pump gate valve TVG is closed. If the chamber |
- | * Box "VENT STATUS" | + | |
- | * Turbo gate valve **I188GV** will be automatically | + | The venting procedure is as follows: |
- | * Vent valve **I190VV** | + | - Monitor the pressure RBT_BTS31: |
- | * Go to the S800 OBJ station | + | - Open the vent valve |
- | * When **I191PG** reads atmospheric pressure select | + | - When the pressure approaches ~800 Torr, close the venting valve. Failure to do so will result in over-pressure in the chamber |
- | * The status in the box "VENT STATUS" | + | |
- | * Close the manual | + | ===== Pumping Object chamber ===== |
- | * You can now open the 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 | ||
+ | * 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' | ||
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