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venting_pumping_intermediate_image_box [2018/12/19 11:01] pereira [Venting/pumping Intermediate Image box and filling PPACs with gas] |
venting_pumping_intermediate_image_box [2024/01/11 12:39] noji [Evacuating the Chamber] |
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- | ====== Venting/ | + | ====== Venting/ |
- | + | * [[#General information]] | |
- | + | * [[#Emptying Detectors]] | |
- | + | * [[#Filling and Running Detectors]] | |
- | + | * [[# | |
===== General information ===== | ===== 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 system is schematically illustrated in the figure below. It shows the status | + | 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 |
- | + | ||
- | {{: | + | |
- | The II-GHS equipment (valves, flow-meter, pipes, isobutane gas bottle. etc.) are located on the west balcony | + | {{: |
- | {{: | + | 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. |
+ | {{: | ||
+ | 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 ===== | ||
- | ===== Vent Intermediate-image chamber ===== | + | From the S800 Main Vacuum page, go to the Intermediate |
- | Requirements: | + | * that the PPACs have been unbiased, |
+ | | ||
+ | * that the turbo pump gate valve **TVG** is closed. | ||
- | * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**) | + | The TMP can be turned |
- | * | + | |
- | * 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 | + | |
- | * 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 " | + | |
- | * Open **S800Vac** and go to page 03 (" | + | |
- | * Isolate chamber by closing gate valves **I212GV** and **I215GV** | + | |
- | * [[Vacuum control|Turn off]] ion gauge **I213IG** | + | |
- | * Check box " | + | |
- | {{: | + | |
- | * In order to begin venting process, select box "VENT STATUS" | + | |
- | * Box "VENT STATUS" | + | |
- | * Turbo gate valve **I214GV** will be automatically closed and pressure in chamber will start rising (as seen in **I215PG**) {{: | + | |
- | * When **I215PG** reads atmospheric pressure, select the box "VENT STATUS" | + | |
- | | + | To vent the chamber: |
- | * You can now open the chamber | + | - Put the GHS in vent mode by clicking **VENT** (valves #5 and #6 are open), |
+ | - monitor **RBT_BTS32: | ||
+ | - close **RV**, | ||
+ | | ||
+ | The PPAC pressure S800_GHS: | ||
+ | RBT_BTS32: | ||
+ | ===== Evacuating the Chamber ===== | ||
- | ===== Pumping Intermediate-image chamber ===== | + | Ensure |
- | Requirements: | + | * that the chamber is closed |
- | * Verify | + | * that the pressure-relief |
- | * Verify that PPACs are not biased by opening the [[HV bias|HV GUI]] | + | {{ : |
- | * IMPORTANT: Verify | + | * that the manual valve (see picture below) |
+ | {{ :wiki:iimanualvalve.jpeg |}} | ||
- | * Insert PPACs/turn on light (Diagnostic Drives PanelMate) and verify condition through sight window on south side of the chamber | + | To evacuate |
- | | + | |
- | * Check " | + | |
- | * Slowly crack manual roughing valve | + | - close **FV** below the TMP, and |
- | | + | - open **RV**. |
- | * Verify PPACs changing shape through sighting window. | + | |
- | * Pump to about 100 Torr before fully opening | + | |
- | * Once roughing | + | |
- | * When the pressure in **I215PG** is below 200 mTorr, the Turbo Pump will start automatically through the following sequence: | + | - Turn on TMP, and wait until it reaches the normal rotation |
- | | + | - Open **TGV**. |
- | * **I214FV** will be opened | + | - Be sure to go back to S3 and close the manual valve. |
- | * **I214GV** will be opened | + | ===== Filling |
- | | + | - If in Vent Mode, click **PUMP** then click **RUN** to enter Run Mode. |
- | * NOTE: it sometimes happens | + | - If in Pump Mode, click **RUN** to enter Run Mode. |
- | * Select box labeled " | + | - Plot and monitor IG_D2430:VP_RD while filling. Ion gauge reading will increase but should remain <1E-5 Torr when PPACs are running at full pressure. |
- | | + | |
- | | + | - PPAC pressure should stabilize after ~1 min. HV may now be turned on to operate the PPACs. |
- | * 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 roughing pump valve | + | |
+ | ===== Troubleshooting ===== | ||
+ | - If any issues are encountered during filling, running, or emptying, contact the Vacuum Operation group for assistance. |