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venting_pumping_object_box [2018/04/25 17:49] 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 |
- | * 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 | + | |
- | * 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 **I188GV** will be automatically closed | + | |
- | * Vent valve **I190VV** will be automatically opened. However, the pressure | + | |
- | * 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. | + | |
- | * 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 | + | |
- | + | ||
- | {{: | + | |
+ | {{: | ||
+ | The vent valve should also be closed when you begin. Before you start venting, make sure of the following: | ||
+ | * The beamline gate valves D2341 BGV and D2303 BGV are closed | ||
+ | * 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 be switched off . | ||
+ | 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 to do so will result in over-pressure in the chamber since it will continue to be filled with dry nitrogen | ||
===== 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 the HV module in dU6 | + | * Make sure that the IG is off. |
- | * Open **S800Vac** and go to page 01 (" | + | * 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. |
- | * Check " | + | * 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. |
- | * When the pressure in **I191PG** is below 100 mTorr, the Turbo Pump will start automatically through | + | * Section D2337 will initially be red with vacuum status: 'Bad vacuum' |
- | * **I190RV** will be closed | + | * Wait until the vacuum reading at FPG to drops to below 200 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 | + | |
- | + | ||