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venting_pumping_object_box [2018/05/03 09:10] pereira |
venting_pumping_object_box [2023/05/25 16:08] swartzj |
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* Open **S800Vac** and go to page 01 (" | * Open **S800Vac** and go to page 01 (" | ||
* Verify that OBJ SCI is not biased: | * Verify that OBJ SCI is not biased: | ||
- | * Check that the detectors | + | * Check that the detectors |
* Notify the system of the bias-off state by selecting the " | * Notify the system of the bias-off state by selecting the " | ||
* Isolate chamber by closing gate valves **I177GV** and **I190GV** | * Isolate chamber by closing gate valves **I177GV** and **I190GV** | ||
* [[Vacuum control|Turn off]] ion gauge **I188IG** | * [[Vacuum control|Turn off]] ion gauge **I188IG** | ||
* Check box " | * 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" | * In order to begin venting process, select box "VENT STATUS" | ||
* Box "VENT STATUS" | * Box "VENT STATUS" | ||
* Turbo gate valve **I188GV** will be automatically closed | * Turbo gate valve **I188GV** will be automatically closed | ||
- | * Vent valve **I190VV** will be automatically opened. However, the pressure in the chamber (ass seen in **I191PG** will not change because we need to open the manual venting valve | + | * 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. | * 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" | * When **I191PG** reads atmospheric pressure select the box "VENT STATUS" | ||
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===== Pumping Object chamber ===== | ===== Pumping Object chamber ===== | ||
- | Requirements: | + | |
- | * Verify | + | From S800 Vacuum Main Page, go to Object chamber page. This will open the page in the figure below. |
- | * Verify that OBJ SCI is not biased by checking | + | * Make sure that the IG is off. |
- | * Open **S800Vac** and go to page 01 (" | + | * 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. |
- | * Check " | + | * 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. |
- | * When the pressure in **I191PG** is below 100 mTorr, the Turbo Pump will start automatically through | + | * Wait for the vacuum reading at BPG to drop to below 100 mTorr before you close RV and open FV. |
- | * **I190RV** will be closed | + | * The vacuum reading at FPG needs to drop to below 150 mTorr before you can safely turn on the turbo pump. |
- | * **I190FV** will be opened | + | * 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. |
- | * **I188GV** will be opened | + | * When the pressure |
- | * When the pressure | + | |
- | + | | |