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venting_pumping_intermediate_image_box [2017/06/12 12:28] pereira created |
venting_pumping_intermediate_image_box [2019/02/13 09:40] pereira [Removing gas from Intermediate-image delay PPAC] |
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- | ===== Venting/ | + | ====== Venting/ |
+ | * [[#General information]] | ||
+ | * [[#Vent Intermediate-image chamber|Venting Intermediate-image chamber]] | ||
+ | * [[#Pumping Intermediate-image chamber]] | ||
+ | * [[# | ||
- | ==== 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 | + | 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 | + | |
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ===== 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 PanelMate) and verify condition through sight window on south side of the chamber (be careful no to bump the bullet camera). | ||
+ | * Open **S800Vac** | ||
+ | | ||
+ | | ||
+ | * Start slow (< 1 Torr/sec). Chamber pressure is displayed in **I215PG** in **S800Vac** PanelMate. There is also a local display of the mechanical pump pressure on a Granville-Phillips 275 Mini-Convectron, | ||
+ | * 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 | ||
+ | * 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 | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ===== Filling/ | ||
+ | |||
+ | {{:wiki:ghsiippacs.png?1000|Gas Handling System of S800 Intermediate Image}} | ||
+ | |||
+ | Requirements: | ||
+ | |||
+ | ==== Filling Intermediate-image delay PPAC with gas ==== | ||
+ | * 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 " | ||
+ | * Verify that ion gauge I213IG | ||
+ | * Verify that PPACs are in automatic mode with gas removed | ||
+ | * The "GH System Status box should read "Auto Mode Gas Removed" | ||
+ | | ||
+ | * Confirm that PanelMate box " | ||
+ | * Open the gas bottle valve (sitting near the gas handling system) | ||
+ | * PanelMate box "Gas Flow Control" | ||
+ | * Valve V2 (Gas lin pmp out) will be opened and I214V_NCL will change from closed to " | ||
+ | * Valves V3 (Flow Bypass) and V4 (Det Return) will open | ||
+ | * Valve V1 (Gas supply) will open, and V2, V3, and V6 (Chamber Bypass) will close | ||
+ | * GH System status should indicate "Gas Flowing" | ||
+ | * I214CM Press Rdg will gradually increase | ||
+ | * When the detector is filled, valve V5 (Det Bypass) will close | ||
+ | * GH System status will indicate "Flow Estab." | ||
+ | * I214BON_CONFIM will change to "PPAC BIAS ASSUMED ON" | ||
+ | * The valves status will be: V1 (open), V2 (closed), V3 (closed), V4 (open), V5 (closed), V6 (closed), I214V_NCL (enabled) | ||
+ | | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ==== Removing gas from Intermediate-image delay PPAC ==== | ||
+ | | ||
+ | | ||
+ | | ||
+ | * Verify that PPACs are in automatic mode with gas flowing (**S3_Gas_Handling**) | ||
+ | * The "GH System Status box should read "Auto Gas Flow Estab" | ||
+ | * If gas is flowing but the system is not in the automatic mode, consult the Beam Physicists or Device Physicist. This typically requires to verify that the system is in a controlled status. In particular, the " | ||
+ | * I214 Gas Sup V1 (open) | ||
+ | * Gas Lin Pmp out V2 (closed) | ||
+ | * Flow Bypass V3 (closed) | ||
+ | * Det Return V4 (open) | ||
+ | * Det Bypass V5 (closed) | ||
+ | * Chmbr Bypass (closed) | ||
+ | * I214V_NCL (enabled) | ||
+ | * PanelMate | ||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | * When the gas is removed from the detector | ||
+ | * Valve V3 (Flow Bypass) and 4 (Det return) will close | ||
+ | * Valve V6 (Chamber Bypass) will open | ||
+ | * GH System status will indicate "Gas Removed" | ||
+ | * I214BON_CONFIM will change to "PPAC BIAS ASSUMED ON" | ||
+ | * The valves status will be: V1 (closed), V2 (closed), V3 (closed), V4 (closed), V5 (open), V6 (open), I214V_NCL (closed) | ||
+ | * Close the gas bottle valve (sitting near the gas handling system) | ||