This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
venting_pumping_intermediate_image_box [2017/06/12 12:32] pereira [Venting/pumping Intermediate Image box] |
venting_pumping_intermediate_image_box [2024/01/11 10:12] noji [Venting the Chamber] |
||
---|---|---|---|
Line 1: | Line 1: | ||
- | ===== Venting/ | + | ====== Venting/ |
- | The procedures to vent/pump the S800 Intermediate Image box 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 was designed to perform these tasks safety. The system is schematically illustrated | + | * [[#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 | ||
- | {{:wiki:fp-venting-valve-Daniel.jpg?350|FP chamber manual venting valve}} {{: | + | {{:wiki:IIGHShardware.jpeg|Gas Handling System of S800 Intermediate Image}} |
- | ==== Vent focal-plane chamber ==== | + | 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. |
- | * Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors are unbiased | + | |
- | * Open the [[gas_handling_system# | + | |
- | * Ensure that the manual venting valve located | + | |
- | * Ensure that the FP ion gauge (I264IG) is off (see details [[vacuum_control|here]]) | + | |
- | * Open PanelMate | + | |
- | * Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure | + | |
- | {{: | + | |
- | * Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read slightly above atmospheric pressure (due to the dry N2 flow pumped to the chamber). The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display " | + | |
+ | {{: | ||
+ | |||
+ | 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 begin 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. | ||
+ | - 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. | ||
+ | * 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 the gate valves **D2426 BGV** and **D2436 BGV** are closed, and that the IG is 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 ===== | ||
+ | - If in Vent Mode, click **PUMP** then click **RUN** to enter Run Mode. | ||
+ | - If in Pump Mode, click **RUN** to enter Run Mode. | ||
+ | - Plot and monitor IG_D2430: | ||
+ | - 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 be a quick process but **DO NOT** simply set the “PPAC Setpoint” to 6 Torr as the gas flow could overwhelm the system. | ||
+ | - PPAC pressure should stabilize after ~1 min. HV may now be turned on to operate the PPACs. | ||
+ | |||
+ | ===== Troubleshooting ===== | ||
+ | - If any issues are encountered during filling, running, or emptying, contact the Vacuum Operation group for assistance. |