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venting_pumping_object_box [2018/04/25 17:28] pereira |
venting_pumping_object_box [2024/02/06 10:40] (current) noji |
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====== Venting/ | ====== Venting/ | ||
+ | |||
+ | In CS-Studio/ | ||
+ | |||
+ | {{: | ||
===== Vent Object chamber ===== | ===== Vent Object chamber ===== | ||
- | Requirements: | ||
- | * Open **S800Vac** | + | The vent valve and the roughing valve RV should be closed when you begin. |
- | * Verify that OBJ SCI is not biased: | + | |
- | * Check that the detectors is unbiased in the HV module sitting in dU6 | + | The venting procedure |
- | * Notify the system of the bias-off state by selecting | + | |
- | | + | |
- | | + | |
- | | + | |
- | {{:wiki:objs800vac_pumped.jpg? | + | |
- | | + | - Monitor the pressure RBT_BTS31:BPG_D2337:VP_RD in a data browser |
- | * Box "VENT STATUS" | + | |
- | * Turbo gate valve **I214GV** will be automatically closed and pressure in chamber will start rising (as seen in **I215PG**) {{: | + | |
- | | + | |
+ | ===== Pumping Object chamber ===== | ||
- | * The status | + | From S800 Vacuum Main Page, go to Object chamber page. This will open the page in the figure below. |
- | * You can now open the chamber | + | * Make sure that the IG is off. |
+ | * When you start, you should | ||
+ | * 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' | ||