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venting_pumping_intermediate_image_box [2018/08/14 10:52] pereira [Pumping Intermediate-image chamber] |
venting_pumping_intermediate_image_box [2024/01/11 09:51] noji [Venting Chamber] |
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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 safely. | + | * [[#General information]] |
- | + | * [[#Emptying Detectors]] | |
- | {{: | + | * [[#Filling and Running Detectors]] |
- | + | * [[# | |
- | 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): | + | ===== 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): | ||
{{: | {{: | ||
+ | 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**) | + | |
- | | + | |
- | * 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" | + | |
- | | + | * Jorge noted on 2/12/2023 that this step did not work; he reported that when he clicked |
- | | + | |
- | | + | |
- | | + | |
- | * [[Vacuum | + | |
- | | + | |
- | * Check box " | + | |
- | {{: | + | |
- | * In order to begin venting process, select box "VENT STATUS" | + | |
- | * Box "VENT STATUS" | + | |
- | * Turbo gate valve **I214GV** will be automatically closed and pressure in chamber will start rising (as seen in **I215PG**) {{: | + | |
- | * When **I215PG** reads atmospheric pressure, select | + | |
- | + | ||
- | * The status in the box "VENT STATUS" | + | |
- | * You can now open the chamber | + | |
- | ===== Pumping Intermediate-image chamber | + | ===== Venting the Chamber |
- | Requirements: | + | |
- | * Verify that Chamber is closed and pressure-relief valve (north side of the chamber) is properly closed (NOTE: sometimes, due to overpressure from dry N2 during the venting procedure, the O-ring in pressure-relief valve flange is moved out of place) | + | |
- | * Verify that PPACs are not biased by opening the [[HV bias|HV GUI]] | + | |
- | * IMPORTANT: Verify that manual roughing pump valve located near the intermediate-image chamber is closed{{: | + | |
- | * Insert PPACs/turn on light (Diagnostic Drives PanelMate) and verify condition through sight window on south side of the chamber (be careful no to bump the bullet camera). | + | ===== Evacuating |
- | * Open **S800Vac** | + | ===== Filling |
- | | + | |
- | | + | |
- | | + | |
- | * Verify PPACs changing shape through sighting window. | + | - Step up “PPAC Setpoint” by 1 Torr from 0 to 6 Torr. Allow the “PPAC Pressure” to stabilize for 15 seconds at each step. This should |
- | * Pump to about 100 Torr before fully opening the roughing valve. | + | - PPAC pressure |
- | | + | |
- | * When the pressure | + | |
- | | + | |
- | * **I214FV** will be opened | + | |
- | * **I214GV** will be opened | + | |
- | | + | |
- | | + | |
- | * Select box labeled " | + | |
- | * Select box labeled "TURBO PUMP INTERMEDIATE IMAGE BOX I214TP" | + | |
- | * Turbo pump will start ramping speed. When the TP reaches 40000 RPM, the **I214GV** will open automatically. | + | |
- | * When foreline vacuum gets below 2 Torr, you can select " | + | |
- | * (Note: sometimes it is necessary to repeat this operation a couple of times). | + | |
- | * 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. |