installation_fp_sci
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installation_fp_sci [2023/07/12 08:43] noji |
installation_fp_sci [2025/12/01 12:34] (current) pereira [Venting FP Chamber] |
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| ===== Emptying Detectors ===== | ===== Emptying Detectors ===== | ||
| + | - Verify that the High Voltages supplies for all focal plane detectors are turned off | ||
| - Check that the system is in **RUN** mode on the “FP_State_Buttons” page under FRIB EXP Main → S800 → GHS Pages (Secondary Pages) | - Check that the system is in **RUN** mode on the “FP_State_Buttons” page under FRIB EXP Main → S800 → GHS Pages (Secondary Pages) | ||
| - Return to “GHS_FP_Main” click **Enable MFC Controls** | - Return to “GHS_FP_Main” click **Enable MFC Controls** | ||
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| - The IC vessel has a much larger quantity of gas compared to the CRDC vessel. In order to pump them out at a similar speed go to the “FP_State_Buttons” page and go to the D2708 (Ion Chamber) tab. Click **EMPTY**. This will more rapidly pump down the IC vessel. Both vessels should be emptied at about the same time. | - The IC vessel has a much larger quantity of gas compared to the CRDC vessel. In order to pump them out at a similar speed go to the “FP_State_Buttons” page and go to the D2708 (Ion Chamber) tab. Click **EMPTY**. This will more rapidly pump down the IC vessel. Both vessels should be emptied at about the same time. | ||
| - Open a data browser and plot the PVs for PT1 (S800_GHS: | - Open a data browser and plot the PVs for PT1 (S800_GHS: | ||
| - | - Wait for PT1 and PT2 to read < 2 Torr. This should take about 30 minutes. | + | - Wait for PT1 and PT2 to read < 0.5 Torr. This should take about 30 minutes. |
| - Open the Focal Plane VAC D2686 page (FRIB EXP Main → S800 → Vacuum Main → Focal Plane). | - Open the Focal Plane VAC D2686 page (FRIB EXP Main → S800 → Vacuum Main → Focal Plane). | ||
| - Ensure the beamline gate valve to the FP chamber is closed (BGV_D2671). | - Ensure the beamline gate valve to the FP chamber is closed (BGV_D2671). | ||
| - Ensure IG_D2686 is off. | - Ensure IG_D2686 is off. | ||
| - | - Notify the Control Room that EXP alarms may occur. | + | - Notify the Control Room and Vacuum Group that EXP alarms may occur. |
| - On the “FP_State_Buttons” page, click VENT mode for both D2703 (CRDCs) and D2708 (Ion Chamber). | - On the “FP_State_Buttons” page, click VENT mode for both D2703 (CRDCs) and D2708 (Ion Chamber). | ||
| - The detector volumes will be bypassed to the chamber. The TGV and TMP should handle the gas load and quickly pump the chamber back to high vacuum. If any issues occur, contact the Rare Isotope Operations Vacuum Group. | - The detector volumes will be bypassed to the chamber. The TGV and TMP should handle the gas load and quickly pump the chamber back to high vacuum. If any issues occur, contact the Rare Isotope Operations Vacuum Group. | ||
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| ===== Venting FP Chamber ===== | ===== Venting FP Chamber ===== | ||
| + | |||
| + | Notify the Control Room and Vacuum Group that you will vent the FP chamber. | ||
| + | |||
| - Ensure the IG in the Focal Plane Pumping Station is off. This page can be found in FRIB EXP Main → S800 → Vacuum Main (Primary Pages) → Focal Plane. | - Ensure the IG in the Focal Plane Pumping Station is off. This page can be found in FRIB EXP Main → S800 → Vacuum Main (Primary Pages) → Focal Plane. | ||
| - Check the box next to “Valve Controls”, | - Check the box next to “Valve Controls”, | ||
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| - If CSET is not set to **300 Torr**, adjust MFC1 back to 25 sccm when the setpoint is reached. | - If CSET is not set to **300 Torr**, adjust MFC1 back to 25 sccm when the setpoint is reached. | ||
| - The control valve for the IC vessel is set to react slowly as the vessel has a long pressure period. The valve will not “wake up” until 300 Torr is reached on PT1. This is okay as long as the control valve begins to open by this point. The pressure change is slow enough that over the next hour the valve will open enough to catch the pressure before it exceeds **305 Torr**, well within the operating limit (500 Torr). | - The control valve for the IC vessel is set to react slowly as the vessel has a long pressure period. The valve will not “wake up” until 300 Torr is reached on PT1. This is okay as long as the control valve begins to open by this point. The pressure change is slow enough that over the next hour the valve will open enough to catch the pressure before it exceeds **305 Torr**, well within the operating limit (500 Torr). | ||
| - | - The PID controls for each vessel are calibrated to maintain their respective setpoints to within +/- 0.1 Torr. If the operator notices a larger variation after an hour of PID control, notify the Rare Isotope Operations | + | - The PID controls for each vessel are calibrated to maintain their respective setpoints to within +/- 0.1 Torr. If the operator notices a larger variation after an hour of PID control, notify the Rare Isotope Operations |
| + | |||
| + | ===== Zeroing PTs ===== | ||
| + | |||
| + | * When readings of the capacitance manometers (PT1 [S800_GHS: | ||
| + | * **Before “zeroing” a pressure gauge. Make sure it is completely bottomed out.** This would correspond to the GHS being in “Vent” mode and the TMP being on. If the IG is on and shows that the system is under High Vacuum (<10-3 Torr) you can go ahead and zero the gauge. | ||
| + | * Here are instructions with screenshots by Josh: | ||
| + | * {{:: | ||
| + | * {{:: | ||
| + | * {{:: | ||
| + | * The relevant PVs are " | ||
| ====== Opening/ | ====== Opening/ | ||
installation_fp_sci.1689165803.txt.gz · Last modified: 2023/07/12 08:43 by noji
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