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venting_pumping_intermediate_image_box [2017/06/12 12:28] pereira created |
venting_pumping_intermediate_image_box [2018/12/19 11:10] pereira [Filling Intermediate-image delay PPAC] |
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- | ===== Venting/ | + | ====== Venting/ |
+ | * [[#General information]] | ||
+ | * [[#Vent Intermediate-image chamber|Venting Intermediate-image chamber]] | ||
+ | * [[#Pumping Intermediate-image chamber]] | ||
+ | * [[#Filling Intermediate-image delay PPAC]] | ||
- | ==== Vent focal-plane chamber | + | ===== General information ===== |
- | * Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors | + | The procedures to vent/ |
- | * Open the [[gas_handling_system# | + | |
- | * Ensure that the manual | + | {{: |
- | * Ensure | + | |
- | * Open PanelMate and select | + | 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): |
- | * Gently open the manual | + | |
- | {{:wiki:fp-pirani.jpg?350|FP chamber manual venting valve}} | + | {{: |
- | * Wait until the chamber is vented | + | |
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+ | ===== Vent Intermediate-image chamber ===== | ||
+ | Requirements: | ||
+ | |||
+ | * Verify that PPACs are in automatic mode with gas removed | ||
+ | * 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 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** | ||
+ | * [[Vacuum control|Turn off]] ion gauge **I213IG** | ||
+ | * 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: Verify that manual roughing pump valve located near the intermediate-image chamber is closed{{: | ||
+ | |||
+ | * Insert PPACs/turn on light (Diagnostic Drives | ||
+ | | ||
+ | | ||
+ | * Slowly crack manual | ||
+ | * Start slow (< 1 Torr/sec). Chamber | ||
+ | * Verify PPACs changing shape through sighting window. | ||
+ | * Pump to about 100 Torr before fully opening the roughing valve. | ||
+ | * Once roughing valve is fully open, retract PPACs and turn lights off. | ||
+ | * When the pressure in **I215PG** is below 200 mTorr, the Turbo Pump will start automatically through the following sequence: | ||
+ | * **I214RV** will be closed | ||
+ | * **I214FV** will be opened | ||
+ | * **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: it sometimes happens that the foreline pressure rises above the trip point for the Turbo Pump (e.g. if the pumpdown timer expires before pressure is below 300 mTorr, or there is too much back-up pressure from the chamber when the foreline valve opens). In this situation, you will see that: (1) the turbo pump will stop, (2) the turbo gate valve **I214GV** will be closed, (3) the foreline valve **I214FV** will be closed and the corresponding PanelMate box will turn red and display an error message " | ||
+ | * 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). | ||
+ | | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ===== Filling Intermediate-image delay PPAC ===== | ||
+ | Requirements: | ||
+ | |||
+ | * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**) | ||
+ | * The "GH System Status box should | ||
+ | * If gas is removed but the system is not in the automatic mode, consult the Beam Physicists or Device | ||