venting_pumping_intermediate_image_box
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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venting_pumping_intermediate_image_box [2017/06/13 11:43] pereira |
venting_pumping_intermediate_image_box [2017/06/13 15:40] pereira [Pumping Intermediate-image chamber] |
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| - | ===== Vent focal-plane chamber ===== | + | ===== Vent Intermediate-image chamber ===== |
| Requirements: | Requirements: | ||
| Line 35: | Line 35: | ||
| * The status in the box "VENT STATUS" | * The status in the box "VENT STATUS" | ||
| * You can now open the chamber | * You can now open the chamber | ||
| + | |||
| + | |||
| + | ===== Pumping Intermediate-image 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: Close manual roughing pump valve (close to the Intermediate-image chamber) {{: | ||
| + | |||
| + | * 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** and go to page 03 (" | ||
| + | * Check " | ||
| + | * Slowly crack manual roughing valve | ||
| + | * 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 (or in **I215PG** in **S800Vac** PanelMate) | ||
| + | * 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. | ||
| + | * 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: WHAT TO DO IF PUMPDOWN TIMER EXPIRES BEFORE TURBO PUMP IS ON | ||
| + | * At the end of the procedure, close the manual roughing pump valve | ||
venting_pumping_intermediate_image_box.txt ยท Last modified: 2024/01/12 09:37 by noji
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