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venting_pumping_intermediate_image_box [2017/06/12 12:36] pereira [Venting/pumping Intermediate Image box] |
venting_pumping_intermediate_image_box [2017/06/13 12:57] pereira [Pumping Intermediate-image 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 was designed to perform these tasks safety. The system is schematically illustrated in the figure below: | + | 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 |
{{: | {{: | ||
- | ==== Vent focal-plane chamber ==== | + | |
- | * Open the [[hv_bias|HV Remote Control]] GUI and ensure | + | 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): |
- | * Open the [[gas_handling_system# | + | |
- | * Ensure that the manual | + | {{: |
- | * Ensure | + | |
- | * Open PanelMate and select | + | |
- | * Gently open the manual | + | |
- | {{: | + | |
- | * Wait until the chamber | + | |
+ | |||
+ | |||
+ | ===== Vent Intermediate-image chamber | ||
+ | Requirements: | ||
+ | |||
+ | * 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. NOTE: the only valves that should be open in **S3_Gas_Handling** are the "Det Bypass" | ||
+ | * Verify that PPACs are not biased: | ||
+ | * Check that the detectors are unbiased | ||
+ | * Notify | ||
+ | | ||
+ | | ||
+ | | ||
+ | * Check box " | ||
+ | {{: | ||
+ | * In order to begin venting | ||
+ | * Box "VENT STATUS" | ||
+ | * Turbo gate valve **I214GV** will be automatically | ||
+ | * When **I215PG** reads atmospheric pressure, select the box "VENT STATUS" | ||
+ | |||
+ | * The status in the box "VENT STATUS" | ||
+ | * You can now open the chamber | ||
+ | |||
+ | |||
+ | ===== Pumping Intermediate-image chamber ===== | ||
+ | Requirements: | ||
+ | * Verify | ||
+ | * Verify that PPACs are not biased by opening the [[HV bias|HV GUI]] | ||
+ | * IMPORTANT: Close manual roughing pump valve close to the Intermediate-image chamber | ||
+ | * Insert PPACs/turn on light (Diagnostic Drives | ||
+ | | ||
+ | | ||
+ | * Slowly crack manual | ||
+ | * Start slow (< 1 Torr/sec). Pressure is displayed in the digital display of the Granville-Phillips 275 Mini-Convectron gauge, sitting on top of the chamber | ||
+ | * Verify PPACs changing shape through sighting window | ||
+ | * When PPACs equalize, increase to 5 Torr/sec | ||
+ | * Once roughing valve is fully open, retract PPACs and turn lights off. | ||
+ | | ||
+ | | ||
+ | | ||
+ | * **I214GV** will be opened | ||
+ | * When the pressure ready by **I215PG** is few mTorr, you can turn on the ion gauge **I213IG**. Good vacuum will take ~1-2 hours. | ||
+ | * NOTE: WHAT TO DO IF PUMPDOWN | ||