Differences

This shows you the differences between two versions of the page.

--- venting_pumping_object_box [2018/04/25 17:43]
pereira [Vent Object chamber]
+++ venting_pumping_object_box [2023/05/25 16:23] (current)
swartzj
@@ Line 6: / Line 6: @@
   * Open **S800Vac** and go to page 01 ("Production Target Box Vacuum System sec 13")
   * Verify that OBJ SCI is not biased:
-        * Check that the detectors is unbiased in the HV module sitting in dU6
+        * Check that the detectors are 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"
+  * Go to the S800 OBJ station and make sure that the manual valve (see figure below) is closed.
 {{: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
+        * 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.
+        * 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" 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
@@ Line 23: / Line 25: @@
 {{:wiki:ventingvalveobjbox.jpg?300|Venting valve}}
+===== 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 open and the TGV valve, Vent valve, as well as the gate valves named D2341 BGV and D2303 BGV all 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.
+  * 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.
+  * The vacuum reading at FPG needs to drop 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'.
+{{ :20230525_155711.jpg?600 |The object chamber vacuum control page}}

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