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venting_pumping_object_box [2023/05/16 12:23] swartzj |
venting_pumping_object_box [2023/06/02 17:13] swartzj |
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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: | + | * Before you start, make sure that the gate valves |
- | * Check that the detectors are unbiased | + | * The vent valve should |
- | * Notify the system | + | * The valve to the turbo pump TVG should be closed. If the chamber will be vented for a long time, Valve FV should also be closed |
- | * Isolate chamber by closing | + | |
- | * [[Vacuum control|Turn | + | |
- | * Check box " | + | |
- | * Go to the S800 OBJ station | + | |
- | {{:wiki: | + | The procedure is then as follows: |
- | | + | |
- | * Box "VENT STATUS" | + | - Now you can plot the pressure at BPG to monitor the pressure before you open the vent valve. |
- | * 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 | + | |
- | | + | |
- | * When **I191PG** reads atmospheric | + | |
- | * The status | + | |
- | * Close the manual valve | + | |
- | * You can now open the chamber | + | |
- | {{: | + | ===== Pumping Object chamber ===== |
- | + | From S800 Vacuum Main Page, go to Object chamber | |
- | + | * 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. | |
- | ===== Pumping | + | * Close FV and 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. |
- | Requirements: | + | * Section D2337 will initially be red with vacuum status: 'Bad vacuum' |
- | * Verify | + | * Wait until the vacuum reading at FPG to drops to below 200 mTorr before you can safely turn on the turbo pump. |
- | * Verify that OBJ SCI is not biased by checking the HV module in dU6 | + | * 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. |
- | * Open **S800Vac** | + | * When the pressure |
- | * Check " | + | {{ : |
- | * When the pressure in **I191PG** is below 100 mTorr, the Turbo Pump will start automatically through | + | |
- | * **I190RV** will be closed | + | |
- | * **I190FV** will be opened | + | |
- | * **I188GV** will be opened | + | |
- | * When the pressure | + | |
- | + | ||