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--- venting_pumping_object_box [2018/04/25 17:44]
pereira [Vent Object chamber]
+++ venting_pumping_object_box [2024/02/06 10:40] (current)
noji
@@ Line 1: / Line 1: @@
 ====== Venting/pumping Object box ======
+In CS-Studio/Phoebus, from the S800 Main Vacuum page, go to the Object chamber page, opening the page shown below.
+{{:wiki:screenshot_from_2024-02-06_09-20-58.png|}}
 ===== Vent Object chamber =====
-Requirements: PanelMate file **S800Vac**
-  * Open **S800Vac** and go to page 01 ("Production Target Box Vacuum System sec 13")
+The vent valve and the roughing valve RV should be closed when you begin.
-  * Verify that OBJ SCI is not biased:
-        * Check that the detectors is unbiased in the HV module sitting in dU6
+The venting procedure is as follows:
-        * Notify the system of the bias-off state by selecting the "OBJ_SCI_HV CONFIRM" box and clicking "HV CONFIRM OFF"
+  - Notify the Control Room and inform them that they can disregard the EXP alarm that will occur
-  * Isolate chamber by closing gate valves **I177GV** and **I190GV**
+  - Make sure that the detectors inside the chamber have been unbiased
-  * [[Vacuum control|Turn off]] ion gauge **I188IG**
+  - Close the beamline gate valves D2341 BGV and D2303 BGV
-  * Check box "PUMPDOWN STATUS BEAMLINE OBJECT BOX". It should read "Good vacuum"
+  - Turn off the IG
-{{:wiki:objs800vac_pumped.jpg?500|S800vac Panel Mate}}.
+  - Close the turbo pump gate valve TVG. If the chamber will be vented for a long time, the turbo pump should be switched off
-  * In order to begin venting process, select box "VENT STATUS" and click "BEGIN VENTING PROCEDURE"
+  - Monitor the pressure RBT_BTS31:BPG_D2337:VP_RD in a data browser
-        * Box "VENT STATUS" should change from "VENT PROCEDURE STOPPED" to "WAITING FOR VENT TIMER", and then to "VENT VALVE OPEN"
+  - Open the vent valve
-        * Turbo gate valve **I188GV** will be automatically closed
+  - 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
-        * 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
-        * 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.
+===== Pumping Object chamber =====
-        * When **I191PG** reads atmospheric pressure select the box "VENT STATUS" and click "STOP VENTING PROCESS"
-        * The status in the box "VENT STATUS" should display "VENT PROCEDURE STOPPED" and the vent valve **I190VV** should be automatically closed
+From S800 Vacuum Main Page, go to Object chamber page. This will open the page in the figure below.
-        * Close the manual valve
+  * Make sure that the IG is off.
-        * You can now open the chamber
+  * 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.
+  * 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.
+  * Section D2337 will initially be red with vacuum status: 'Bad vacuum'. This must turn to yellow with status 'Poor vacuum'. Wait for the pressure reading at BPG to drop to below 100 mTorr before you close RV and open FV.
+  * 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.
+  * 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'.
-{{:wiki:ventingvalveobjbox.jpg?300|Venting valve}}

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