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installation_fp_sci [2023/07/12 08:43] noji |
installation_fp_sci [2023/08/18 09:35] noji Added instructions for zeroing PTs. |
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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). | ||
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===== Venting FP Chamber ===== | ===== Venting FP Chamber ===== | ||
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+ | Notify the Control Room 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 |
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+ | ===== Zeroing PTs ===== | ||
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+ | - When readings of the PTs (PT1 [S800_GHS: | ||
+ | - The relevant PVs are " | ||
====== Opening/ | ====== Opening/ |