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--- venting_pumping_intermediate_image_box [2023/02/13 14:40]
noji The title has been modified so it is similar to the FP GHS page.
+++ venting_pumping_intermediate_image_box [2024/01/11 10:36]
noji [Venting the Chamber]
@@ Line 1: / Line 1: @@
 ====== Venting/pumping II chamber & emptying/filling gaseous detectors ======
   * [[#General information]]
-  * [[#Vent Intermediate-image chamber|Venting Intermediate-image chamber]]
+  * [[#Emptying Detectors]]
-  * [[#Pumping Intermediate-image chamber]]
+  * [[#Filling and Running Detectors]]
-  * [[#Filling/Removing gas in Intermediate-image delay PPAC]]
+  * [[#Troubleshooting]]
 ===== General information =====
 The procedures to vent/pump the S800 Intermediate Image box, and/or filling the PPAC detectors with gas must be done carefully to ensure that the PPACs are not damaged. For instance, before venting the chamber, we have to make sure that the PPACs are empty and equalized with respect to the vacuum in the chamber. In order to avoid errors, an automated gas handling system (II-GHS) was designed to perform these tasks safely. The II-GHS equipment (valves, flow-meter, pipes, isobutane gas bottle. etc.) are located on the west balcony of the top level in the S3 vault (see figure below):
-{{:wiki:IIGHShardware.jpg?600|Gas Handling System of S800 Intermediate Image}}
+{{:wiki:IIGHShardware.jpeg|Gas Handling System of S800 Intermediate Image}}
 The GHS is operated remotely through CS studio. Its page can be found on the EXP network through FRIB EXP Main → S800 → GHS Pages (Secondary Pages) → Intermediate Image PPAC and is shown below.
@@ Line 24: / Line 23: @@
 ===== Emptying Detectors =====
   - Set “PPAC Setpoint” to 0 Torr.
-  - Click **EMPTY** on the “GHS_II-PPAC_Main” page to begin pumping out the gas quickly.
+  - Click **EMPTY** on the “GHS_II-PPAC_Main” page to open valves #3 and #4 which will allow for pumping out the gas quickly.
-  - When “PPAC Pressure” reads < 0.1 Torr, click **MAN** and then **AUTO**. This will release the remaining gas into the diagnostics box.
+  - When “PPAC Pressure” reads < 0.1 Torr, turn off IG and click **MAN** and then **AUTO**. This will open valve #6 to release the remaining gas into the diagnostics box.
   - Monitor D2340 pumping station and ensure the TMP stays on and TGV remains open. If not, contact the Vacuum Operation group.
-  - Valves #1-5 should be closed and valve #6 should remain open. From this state click PUMP to enter pump mode and leave the system in this state until it is ready to be filled.
+  - Valves #1-5 should be closed and valve #6 should remain open. From this state click **VENT** and then **PUMP** to enter pump mode and leave the system in this state until it is ready to be filled.
-    * Jorge noted on 2/12/2023 that this step did not work; he reported that when he clicked **PUMP** nothing happened. Instead, he had to “manually” enter the PV name associated with this command and changed from 0 to 1. He speculated that this was most likely due to a CS Studio problem.
+===== Venting the Chamber =====
+From the S800 Main Vacuum page, go to the Intermediate Image - RBT_BTS32 D2430 Pumping Station page, and ensure
+  * that the PPACs have been unbiased,
+  * that this pumping station has been isolated by having the gate valves **D2426 BGV** and **D2436 BGV** closed, and that the IG has been turned off, and
+  * that the turbo pump gate valve **TVG** is closed.
+The TMP can be turned off at this time.
+To vent the chamber:
+  - Put the GHS in vent mode by clicking **VENT**,
+  - monitor **RBT_BTS32:BPG_D2430:VP_RD** and **S800_GHS:PI_D2431:V_RD_AB** in a data browser,
+  - close **RV**, the valve to the roughing pump, and
+  - open **Vent**.
+The PPAC pressure S800_GHS:PI_D2431:V_RD_AB should closely follow the chamber pressure
+RBT_BTS32:BPG_D2430:VP_RD
+===== Evacuating the Chamber =====
+{{:wiki:iimanualvalve.jpeg|}}
 ===== Filling and Running Detectors =====
   - If in Vent Mode, click **PUMP** then click **RUN** to enter Run Mode.

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