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venting_pumping_intermediate_image_box [2017/06/13 15:40] pereira [Pumping Intermediate-image chamber] |
venting_pumping_intermediate_image_box [2024/01/11 08:58] noji Updated the table of contents. |
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- | ====== Venting/ | + | ====== Venting/ |
- | 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 safety. The system is schematically illustrated in the figure below. It shows the status of the valves (red: closed, white: open) when the intermediate image chamber is under vacuum and the PPACs are filled with gas: | + | * [[#General information]] |
- | + | * [[#Emptying Detectors]] | |
- | {{: | + | * [[#Filling and Running Detectors]] |
- | + | * [[# | |
- | The II-GHS equipment (valves, flow-meter, pipes, etc.) are located on the west balcony of the top level in the S3 vault (see figure below): | + | ===== 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, | ||
{{: | {{: | ||
+ | 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. | ||
+ | {{: | ||
+ | The layout of the II-GHS is shown below. | ||
+ | {{: | ||
+ | The operational states of the II-GHS are shown in the diagram below. | ||
+ | {{: | ||
- | ===== Vent Intermediate-image chamber | + | ===== Emptying Detectors |
- | Requirements: | + | - Set “PPAC Setpoint” to 0 Torr. |
- | + | | |
- | * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**) | + | - When “PPAC Pressure” reads < 0.1 Torr, click **MAN** and then **AUTO**. This will release |
- | * The "GH System Status box should read "Auto Mode Gas Removed" | + | - Monitor D2340 pumping station and ensure |
- | * If gas is removed but the system is not in the automatic mode, consult the Beam Physicists or Device Physicist. NOTE: the only valves that should be open in **S3_Gas_Handling** are the "Det Bypass" | + | - 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 |
- | | + | * Jorge noted on 2/ |
- | * Check that the detectors are unbiased by opening the [[HV bias|HV GUI]] | + | |
- | * Notify the system of the bias-off state by selecting the " | + | |
- | * Isolate chamber by closing gate valves **I212GV** and **I215GV** | + | |
- | * [[Vacuum control|Turn off]] ion gauge **I213IG** | + | |
- | * Open **S800Vac** and go to page 03 (" | + | |
- | * Check box " | + | |
- | {{: | + | |
- | * In order to begin venting process, select that box and click "BEGIN VENTING PROCEDURE" | + | |
- | | + | |
- | | + | |
- | * When **I215PG** reads atmospheric pressure, select | + | |
- | + | ||
- | * The status in the box "VENT STATUS" | + | |
- | * You can now open the chamber | + | |
- | + | ||
- | + | ||
- | ===== Pumping Intermediate-image chamber ===== | + | |
- | Requirements: | + | |
- | * Verify that Chamber is closed and pressure-relief | + | |
- | * Verify | + | |
- | | + | |
- | * Insert PPACs/turn on light (Diagnostic Drives PanelMate) | + | ===== Filling |
- | * Open **S800Vac** and go to page 03 (" | + | |
- | * Check " | + | |
- | | + | - Plot and monitor IG_D2430: |
- | * Start slow (< 1 Torr/sec). Pressure is displayed | + | |
- | * Verify PPACs changing shape through sighting window | + | |
- | * When PPACs equalize, | + | |
- | * Once roughing valve is fully open, retract | + | |
- | | + | |
- | * **I214RV** will be closed | + | |
- | * **I214FV** will be opened | + | |
- | * **I214GV** will be opened | + | |
- | | + | |
- | * NOTE: WHAT TO DO IF PUMPDOWN TIMER EXPIRES BEFORE TURBO PUMP IS ON | + | |
- | * At the end of the procedure, close the manual roughing pump valve | + | |
+ | ===== Troubleshooting ===== | ||
+ | - If any issues are encountered during filling, running, or emptying, contact the Vacuum Operation group for assistance. |