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--- venting_pumping_object_box [2018/04/25 17:49]
pereira [Vent Object chamber]
+++ venting_pumping_object_box [2024/02/06 10:40]
noji
@@ Line 1: / Line 1: @@
 ====== Venting/pumping Object box ======
-===== Vent Object chamber =====
+In CS-Studio/Phoebus, from the S800 Main Vacuum page, go to the Object chamber page, opening the page shown below.
-Requirements: PanelMate file **S800Vac**
-  * Open **S800Vac** and go to page 01 ("Production Target Box Vacuum System sec 13")
+{{:wiki:screenshot_from_2024-02-06_09-20-58.png|}}
-  * 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 the "OBJ_SCI_HV CONFIRM" box and clicking "HV CONFIRM OFF"
-  * Isolate chamber by closing gate valves **I177GV** and **I190GV**
-  * [[Vacuum control|Turn off]] ion gauge **I188IG**
-  * Check box "PUMPDOWN STATUS BEAMLINE OBJECT BOX". It should read "Good vacuum"
-{{:wiki:objs800vac_pumped.jpg?500|S800vac Panel Mate}}.
-  * In order to begin venting process, select box "VENT STATUS" and click "BEGIN VENTING PROCEDURE"
-        * Box "VENT STATUS" should change from "VENT PROCEDURE STOPPED" to "WAITING FOR VENT TIMER", and then to "VENT VALVE OPEN"
-        * 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
-        * 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" 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
-        * Close the manual valve
-        * You can now open the chamber
-{{:wiki:ventingvalveobjbox.jpg?300|Venting valve}}
+===== 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:BPG_D2337:VP_RD in a data browser
+  - 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 =====
-Requirements: PanelMate file **S800Vac**
-  * Verify that Chamber is closed and that manual roughing pump valve located near the intermediate-image chamber is closed (see picture above)
+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 ("Production Target Box Vacuum System sec 13")
+  * 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 "PUMPDOWN STATUS INTERMEDIATE BEAMLINE OBJECT BOX"; it should read "PUMPDOWN STOPPED". Select that box and click on "START PUMPDOWN".
+  * 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 the following sequence:
+  * 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.
-        * **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 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 ready by **I191PG** is few mTorr, you can turn on the ion gauge **I188IG**. Good vacuum will take ~30 minutes.

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