venting_pumping_object_box
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
venting_pumping_object_box [2023/05/25 16:23] swartzj |
venting_pumping_object_box [2024/02/06 10:40] (current) noji |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| ====== Venting/ | ====== Venting/ | ||
| - | ===== Vent Object chamber | + | In CS-Studio/ |
| - | Requirements: | + | |
| - | * Open **S800Vac** and go to page 01 (" | + | {{:wiki:screenshot_from_2024-02-06_09-20-58.png|}} |
| - | * 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. | + | |
| - | + | ||
| - | {{:wiki:objs800vac_pumped.jpg? | + | |
| - | * 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 | + | |
| - | + | ||
| - | {{: | + | |
| + | ===== Vent Object chamber ===== | ||
| + | The vent valve and the roughing valve RV should be closed when you begin. | ||
| + | The venting procedure is as follows: | ||
| + | - Notify the Control Room and inform them that they can disregard the EXP alarm that will occur | ||
| + | - Make sure that the detectors inside the chamber have been unbiased | ||
| + | - Close the beamline gate valves D2341 BGV and D2303 BGV | ||
| + | - Turn off the IG | ||
| + | - Close the turbo pump gate valve TVG. If the chamber will be vented for a long time, the turbo pump should be switched off | ||
| + | - 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 ===== | ||
| Line 33: | Line 23: | ||
| From S800 Vacuum Main Page, go to Object chamber page. This will open the page in the figure below. | 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. | * 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. | + | * When you start, you should have RV closed, FV 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. | + | * Open RV to start pumping down the object chamber with the roughing pump. You can make a plot of the pressure |
| * Section D2337 will initially be red with vacuum status: 'Bad vacuum' | * 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. | + | * 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. | * 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' | * 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' | ||
| - | {{ : | + | |
venting_pumping_object_box.1685046182.txt.gz · Last modified: 2023/05/25 16:23 by swartzj
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
