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venting_pumping_intermediate_image_box [2017/06/12 14:54] pereira [Vent focal-plane chamber] |
venting_pumping_intermediate_image_box [2023/02/13 14:40] noji The title has been modified so it is similar to the FP GHS page. |
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- | ===== Venting/ | + | ====== Venting/ |
- | The procedures to vent/pump the S800 Intermediate | + | * [[#General information]] |
+ | * [[# | ||
+ | * [[#Pumping Intermediate-image chamber]] | ||
+ | * [[# | ||
- | {{: | + | ===== 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, etc.) are located on the west balcony of the top level in the S3 vault (see figure below): | + | |
{{: | {{: | ||
- | ==== Vent focal-plane chamber ==== | ||
- | Requirements: | ||
- | * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**) | + | 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. |
- | * | + | |
- | * 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 | + | {{:wiki: |
- | * Verify that PPACs are not biased: | + | |
- | * Check that the detectors are unbiased by opening the [[HV bias|HV GUI]] | + | The layout |
- | * Notify the system | + | |
- | * Isolate chamber by closing gate valves **I212GV** and **I215GV** | + | {{: |
- | * [[Vacuum control|Turn off]] ion gauge **I213IG** | + | |
- | * Open **S800Vac** and go to page 03 (" | + | The operational states of the II-GHS are shown in the diagram below. |
- | * Check box " | + | |
- | {{:wiki:iis800vac_pumped.jpg?350|S800vac Panel Mate}}. | + | {{:wiki:ii-ppac-ghs-operationalstates.png|}} |
- | * In order to begin venting process, select that box and click "BEGIN VENTING PROCEDURE" | + | |
- | | + | ===== Emptying Detectors ===== |
- | | + | - Set “PPAC Setpoint” to 0 Torr. |
- | * When **I215PG** reads atmospheric pressure, select | + | |
+ | - 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 | ||
+ | * Jorge noted on 2/12/2023 that this step did not work; he reported that when he clicked | ||
- | | + | ===== 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 | ||
+ | ===== Troubleshooting ===== | ||
+ | - If any issues are encountered during filling, running, or emptying, contact the Vacuum Operation group for assistance. |