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venting_pumping_intermediate_image_box [2018/12/19 11:07] pereira [Venting/pumping Intermediate Image box and filling PPACs with gas] |
venting_pumping_intermediate_image_box [2024/01/12 09:37] noji [Filling and Running Detectors] |
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- | ====== Venting/ | + | ====== Venting/ |
* [[#General information]] | * [[#General information]] | ||
- | * [[#Vent Intermediate-image chamber|Venting | + | * [[#Emptying Detectors]] |
- | * [[#Pumping Intermediate-image chamber]] | + | * [[#Venting |
- | * [[# | + | * [[#Evacuating the Chamber]] |
+ | * [[# | ||
+ | * [[# | ||
===== 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 ===== | ||
+ | - Double check that the detectors have been unbiased. | ||
+ | - 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 | + | - Let the Control Room and the Vacuum Operation Group be aware as EXP alarms may occur, |
+ | - put the GHS in vent mode by clicking **VENT** (valves #5 and #6 are open), | ||
+ | - monitor **RBT_BTS32: | ||
+ | - ensure that **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 |
- | * Open **S800Vac** and go to page 03 (" | + | - double-check and make sure that the manual valve is closed, |
- | * Check " | + | |
- | | + | |
- | | + | - open **RV**. |
- | * Verify PPACs changing shape through sighting | + | - A message window, which reads, |
- | * Pump to about 100 Torr before | + | - now open the manual valve slowly while watching the local display of the Pirani gauge. Open slowly such that the pressure |
- | | + | - On the CSS window, after D2430 turns to yellow indicating that the section is in "POOR VACUUM", |
- | * When the pressure in **I215PG** is below 200 mTorr, the Turbo Pump will start automatically through | + | |
- | * **I214RV** will be closed | + | |
- | | + | - Be sure to go back to S3 and close the manual valve. |
- | * **I214GV** | + | ===== Filling and Running Detectors ===== |
- | | + | - If in Vent Mode, click **PUMP** then click **RUN** to enter Run Mode. The valves #1 and #3 will be open (#6 will be closed). |
- | | + | |
- | * Select box labeled " | + | - Plot and monitor IG_D2430: |
- | * Select box labeled "TURBO PUMP INTERMEDIATE IMAGE BOX I214TP" | + | - Step up “PPAC Setpoint” by 1 Torr from 0 to 6 Torr. Allow the “PPAC Pressure” to stabilize for 15 seconds at each step. This should |
- | * Turbo pump will start ramping speed. When the TP reaches 40000 RPM, the **I214GV** will open automatically. | + | - PPAC pressure |
- | * 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. |