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venting_pumping_intermediate_image_box [2017/06/13 15:40] pereira [Pumping Intermediate-image chamber] |
venting_pumping_intermediate_image_box [2024/01/11 12:39] noji [Evacuating the 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 (II-GHS) was designed to perform these tasks safety. The system is schematically illustrated in the figure below. It shows the status | + | * [[#General information]] |
+ | * [[#Emptying Detectors]] | ||
+ | * [[#Filling and Running Detectors]] | ||
+ | * [[# | ||
+ | ===== 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, isobutane gas bottle. etc.) are located on the west balcony | ||
- | {{:wiki:ghsiippacs.png?1000|Gas Handling System of S800 Intermediate Image}} | + | {{:wiki:IIGHShardware.jpeg|Gas Handling System of S800 Intermediate Image}} |
- | The II-GHS equipment (valves, flow-meter, pipes, etc.) are located | + | 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. |
- | {{:wiki:IIGHShardware.jpg?600|Gas Handling System of S800 Intermediate Image}} | + | {{:wiki:ii-ppac-ghs-css.png|}} |
+ | The layout of the II-GHS is shown below. | ||
+ | {{: | ||
+ | The operational states of the II-GHS are shown in the diagram below. | ||
+ | {{: | ||
+ | ===== Emptying Detectors ===== | ||
+ | - Set “PPAC Setpoint” to 0 Torr. | ||
+ | - Click **EMPTY** on the “GHS_II-PPAC_Main” page to open valves #3 and #4 which will allow for pumping out the gas quickly. | ||
+ | - When “PPAC Pressure” reads < 0.1 Torr, turn off IG and click **MAN** and then **AUTO**. This will open valve #6 to release the remaining gas into the diagnostics box. | ||
+ | - Monitor D2340 pumping station and ensure the TMP stays on and TGV remains open. If not, contact the Vacuum Operation group. | ||
+ | - Valves #1-5 should be closed and valve #6 should remain open. From this state click **VENT** and then **PUMP** to enter pump mode and leave the system in this state until it is ready to be filled. | ||
+ | ===== Venting the Chamber ===== | ||
+ | From the S800 Main Vacuum page, go to the Intermediate Image - RBT_BTS32 D2430 Pumping Station page, and ensure | ||
+ | * that the PPACs have been unbiased, | ||
+ | * that this pumping station has been isolated by having the gate valves **D2426 BGV** and **D2436 BGV** closed, and that the IG has been turned off, and | ||
+ | * that the turbo pump gate valve **TVG** is closed. | ||
- | ===== Vent Intermediate-image chamber ===== | + | The TMP can be turned off at this time. |
- | Requirements: | + | |
- | * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**) | + | To vent the chamber: |
- | * The "GH System Status box should read "Auto Mode Gas Removed" | + | - Put the GHS in vent mode by clicking |
- | * 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" | + | |
- | | + | |
- | * Check that the detectors are unbiased by opening the [[HV bias|HV GUI]] | + | |
- | * Notify the system of the bias-off state by selecting | + | |
- | * Isolate chamber by closing gate valves | + | |
- | * [[Vacuum control|Turn off]] ion gauge **I213IG** | + | |
- | * Open **S800Vac** and go to page 03 (" | + | |
- | * Check box " | + | |
- | {{: | + | |
- | | + | |
- | | + | |
- | | + | |
- | * When **I215PG** reads atmospheric pressure, select the box "VENT STATUS" | + | |
- | * The status in the box "VENT STATUS" | + | The PPAC pressure S800_GHS: |
- | * You can now open the chamber | + | RBT_BTS32: |
+ | ===== Evacuating | ||
+ | Ensure | ||
+ | * that the chamber is closed | ||
+ | * that the pressure-relief mechanism (on the north side of the chamber, see picture below) is sealing (if not, adjust the flange back in place) | ||
+ | {{ : | ||
+ | * that the manual valve (see picture below) is closed. | ||
+ | {{ : | ||
- | ===== Pumping Intermediate-image | + | To evacuate the chamber: |
- | Requirements: PanelMate files **S3_Gas_Handling** and **S800Vac** | + | |
- | | + | |
- | * Verify that PPACs are not biased by opening the [[HV bias|HV GUI]] | + | |
- | | + | |
- | + | | |
- | * Insert PPACs/turn on light (Diagnostic Drives PanelMate) | + | |
- | * Open **S800Vac** and go to page 03 (" | + | - On the CSS window, |
- | | + | |
- | | + | - Open **TGV**. |
- | * Start slow (< 1 Torr/sec). Pressure is displayed in the digital | + | - Be sure to go back to S3 and close the manual valve. |
- | * Verify PPACs changing shape through sighting | + | ===== Filling and Running Detectors ===== |
- | * When PPACs equalize, increase | + | - If in Vent Mode, click **PUMP** then click **RUN** to enter Run Mode. |
- | * Once roughing valve is fully open, retract PPACs and turn lights off. | + | |
- | | + | - Plot and monitor IG_D2430: |
- | * **I214RV** will be closed | + | |
- | * **I214FV** will be opened | + | - PPAC pressure should stabilize after ~1 min. HV may now be turned on to operate the PPACs. |
- | | + | |
- | | + | |
- | * NOTE: WHAT TO DO IF PUMPDOWN TIMER EXPIRES BEFORE TURBO PUMP IS ON | + | |
- | | + | |
+ | ===== Troubleshooting ===== | ||
+ | - If any issues are encountered during filling, running, or emptying, contact the Vacuum Operation group for assistance. |