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venting_pumping_object_box [2018/04/25 17:21] pereira created |
venting_pumping_object_box [2023/05/25 16:23] swartzj |
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====== Venting/ | ====== Venting/ | ||
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+ | ===== Vent Object chamber ===== | ||
+ | Requirements: | ||
+ | |||
+ | * Open **S800Vac** and go to page 01 (" | ||
+ | * Verify that OBJ SCI is not biased: | ||
+ | * Check that the detectors are unbiased in the HV module sitting in dU6 | ||
+ | * Notify the system of the bias-off state by selecting the " | ||
+ | * Isolate chamber by closing gate valves **I177GV** and **I190GV** | ||
+ | * [[Vacuum control|Turn off]] ion gauge **I188IG** | ||
+ | * Check box " | ||
+ | * Go to the S800 OBJ station and make sure that the manual valve (see figure below) is closed. | ||
+ | |||
+ | {{: | ||
+ | * In order to begin venting process, select box "VENT STATUS" | ||
+ | * Box "VENT STATUS" | ||
+ | * Turbo gate valve **I188GV** will be automatically closed | ||
+ | * Vent valve **I190VV** will be automatically opened. However, the pressure in the chamber (as seen in **I191PG** will not change because we need to open the manual venting valve) | ||
+ | * Go to the S800 OBJ station and slowly open the manual valve (see figure below). You can see the pressure rising in the Granville-Phillips 275 Mini-Convectron display located on top of the OBJ box. | ||
+ | * When **I191PG** reads atmospheric pressure select the box "VENT STATUS" | ||
+ | * The status in the box "VENT STATUS" | ||
+ | * Close the manual valve | ||
+ | * You can now open the chamber | ||
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+ | {{: | ||
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+ | ===== 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 open and the TGV valve, Vent valve, as well as the gate valves named D2341 BGV and D2303 BGV all closed. | ||
+ | * Close FV and open RV to start pumping down the object chamber with the roughing pump. You can make a plot of the pressure at BPG at this point. | ||
+ | * Section D2337 will initially be red with vacuum status: 'Bad vacuum' | ||
+ | * The vacuum reading at FPG needs to drop 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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