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venting_pumping_intermediate_image_box [2017/06/12 14:54] pereira |
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 focal-plane 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 that box and click "BEGIN VENTING PROCEDURE" | + | |
- | * 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 | + | |
- | | + | ===== Filling and Running Detectors ===== |
- | | + | - If in Vent Mode, click **PUMP** then click **RUN** to enter Run Mode. |
+ | - If in Pump Mode, click **RUN** to enter Run Mode. | ||
+ | - Plot and monitor IG_D2430: | ||
+ | - 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 be a quick process but **DO NOT** simply set the “PPAC Setpoint” to 6 Torr as the gas flow could overwhelm the system. | ||
+ | - PPAC pressure should stabilize after ~1 min. HV may now be turned on to operate | ||
+ | ===== Troubleshooting ===== | ||
+ | - If any issues are encountered during filling, running, or emptying, contact the Vacuum Operation group for assistance. |