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--- venting_pumping_object_box [2018/04/25 17:28]
pereira
+++ venting_pumping_object_box [2024/02/06 09:37]
noji
@@ Line 2: / Line 2: @@
 ===== Vent Object chamber =====
-Requirements: PanelMate file **S800Vac**
-  * Open **S800Vac** and go to page 01 ("Production Target Box Vacuum System sec 13")
+From the S800 Main Vacuum page, go to the Object chamber page, opening the page shown in the figure below.
-  * 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".
-        * Turbo gate valve **I214GV** will be automatically closed and pressure in chamber will start rising (as seen in **I215PG**) {{:wiki:iis800vac_startventing.jpg?500|S800vac Panel Mate: start venting}}.
-        * When **I215PG** reads atmospheric pressure, select the box "VENT STATUS" and click "STOP VENTING PROCESS". {{:wiki:iis800vac_stopventing.jpg?500|S800vac Panel Mate: stop venting}}.
-        * The status in the box "VENT STATUS" should change from "WAITING FOR VENT TIMER" to "VENT PROCEDURE STOPPED"
+{{:wiki:screenshot_from_2024-02-06_09-20-58.png|}}
-        * You can now open the 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
+  - 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 =====
+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.
+  * 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'.

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