venting_pumping_intermediate_image_box
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venting_pumping_intermediate_image_box [2024/01/11 08:58] noji Updated the table of contents. |
venting_pumping_intermediate_image_box [2024/01/11 10:30] noji [Emptying Detectors] |
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| 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 of the top level in the S3 vault (see figure below): | 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 of the top level in the S3 vault (see figure below): | ||
| - | {{: | + | {{: |
| 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 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. | ||
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| ===== Emptying Detectors ===== | ===== Emptying Detectors ===== | ||
| - Set “PPAC Setpoint” to 0 Torr. | - Set “PPAC Setpoint” to 0 Torr. | ||
| - | - Click **EMPTY** on the “GHS_II-PPAC_Main” page to begin pumping out the gas quickly. | + | - 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, click **MAN** and then **AUTO**. This will release the remaining gas into the diagnostics box. | + | - 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. | - 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 PUMP to enter pump mode and leave the system in this state until it is ready to be filled. | - Valves #1-5 should be closed and valve #6 should remain open. From this state click PUMP to enter pump mode and leave the system in this state until it is ready to be filled. | ||
| * Jorge noted on 2/12/2023 that this step did not work; he reported that when he clicked **PUMP** nothing happened. Instead, he had to “manually” enter the PV name associated with this command and changed from 0 to 1. He speculated that this was most likely due to a CS Studio problem. | * Jorge noted on 2/12/2023 that this step did not work; he reported that when he clicked **PUMP** nothing happened. Instead, he had to “manually” enter the PV name associated with this command and changed from 0 to 1. He speculated that this was most likely due to a CS Studio problem. | ||
| + | ===== 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. | ||
| + | |||
| + | To vent the chamber: | ||
| + | - Monitor **RBT_BTS32: | ||
| + | - close **RV**, the valve to the roughing pump, and | ||
| + | - open **Vent**. | ||
| + | |||
| + | The PPAC pressure S800_GHS: | ||
| + | RBT_BTS32: | ||
| + | ===== Evacuating the Chamber ===== | ||
| + | |||
| + | {{: | ||
| ===== Filling and Running Detectors ===== | ===== Filling and Running Detectors ===== | ||
| - If in Vent Mode, click **PUMP** then click **RUN** to enter Run Mode. | - If in Vent Mode, click **PUMP** then click **RUN** to enter Run Mode. | ||
venting_pumping_intermediate_image_box.txt · Last modified: 2024/01/12 09:37 by noji
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