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--- venting_pumping_intermediate_image_box [2018/12/19 11:07]
pereira [Pumping Intermediate-image chamber]
+++ venting_pumping_intermediate_image_box [2018/12/19 11:42]
pereira [Filling Intermediate-image delay PPAC]
@@ Line 73: / Line 73: @@
-===== Filling Intermediate-image delay PPAC =====
+===== Filling/Removing gas in Intermediate-image delay PPAC =====
+{{:wiki:ghsiippacs.png?1000|Gas Handling System of S800 Intermediate Image}}
+Requirements: PanelMate files **S3_Gas_Handling** and **S800Vac**
+  * Verify that PPACs are not biased:
+        * Check that the detectors are unbiased by opening the [[HV bias|HV GUI]]
+        * Notify the system of the bias-off state by selecting the "I214BON_CONFIRM" box in **S3_Gas_Handling** and clicking "PP BIAS OFF CONFIRMED"
+  * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**)
+        * The "GH System Status box should read "Auto Mode Gas Removed"
+        * If gas is removed but the system is not in the automatic mode, consult the Beam Physicists or Device Physicist. This typically requires to verify that the system is in a controlled status. In particular, the "I214BON_CONFIRM" box should indicate "PP BIAS OFF CONFIRMED", and the only that should be open in **S3_Gas_Handling** are the "Det Bypass" (V5) and "Chmbr Bypass" (V6); the rest of the valves (Gas Sup V1, Gas Lin Pmp Out V2, Flow Bypass V3, Det Return V4, and I214V_NCL (enable) should be closed)
+  * Confirm that PanelMate box "I214P_AUTO/MAN Pre Set" reads 5 Torr (the set gas pressure in the detector)
+  * Open the gas bottle valve (sitting near the gas handling system)
+  * PanelMate box "Gas Flow Control" should indicate "OK to Start Gas Flow". Select that box and click on "Start Gas Flow"
+        * Valve V2 (Gas lin pmp out) will be opened and I214V_NCL will change from closed to "ENABLED"
+        * Valves V3 (Flow Bypass) and V4 (Det Return) will open
+        * Valve V1 (Gas supply) will open, and V2, V3, and V6 (Chamber Bypass) will close
+        * GH System status should indicate "Gas Flowing"
+        * I214CM Press Rdg will gradually increase to the set value
+  * When the detector is filled, valve V5 (Det Bypass) will close
+        * GH System status will indicate "Flow Estab."
+        * I214BON_CONFIM will change to "PPAC BIAS ASSUMED ON"
+        * The valves status will be: V1 (open), V2 (closed), V3 (closed), V4 (open), V5 (closed), V6 (closed, I214V_NCL (enabled)
+        * You can now turn on the detectors

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