installation_fp_sci
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installation_fp_sci [2023/03/07 08:27] pereira [Venting FP Chamber] |
installation_fp_sci [2023/05/11 13:15] pereira |
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| - Click **Enable Controls** for the CRDC and IC Control Valve PIDs and then click **DISABLE** for each of them. This will open the control valve to 100% for each vessel and begin pumping them out. | - Click **Enable Controls** for the CRDC and IC Control Valve PIDs and then click **DISABLE** for each of them. This will open the control valve to 100% for each vessel and begin pumping them out. | ||
| - 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 (IC vessel) tab. Click **MAN** to enable manual mode. Click **OPN** for “S800_GHS: | - 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 (IC vessel) tab. Click **MAN** to enable manual mode. Click **OPN** for “S800_GHS: | ||
| - | - Open a data browser and plot the PVs for PT1 and PT2. | + | - 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 < 2 Torr. This should take about 30 minutes. | ||
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| - Once the FPG bottoms out, check the box next to “Valve Controls”, | - Once the FPG bottoms out, check the box next to “Valve Controls”, | ||
| - If the system will only be vented for a short time, leave the TMP on, otherwise turn it off. | - If the system will only be vented for a short time, leave the TMP on, otherwise turn it off. | ||
| - | - Plot PT1 (S800_GHS: | + | - Plot PT1 (S800_GHS: |
| - Briefly (~2 seconds) open the vent valve by clicking **Open** next to the valve labeled “Vent” then click **Close**. Check that all the pressures are increasing at the same rate. | - Briefly (~2 seconds) open the vent valve by clicking **Open** next to the valve labeled “Vent” then click **Close**. Check that all the pressures are increasing at the same rate. | ||
| - Again, open the vent valve and observe the pressure for 30 seconds to ensure the pressures are increasing at the same rate among all four gauges. If a difference of > 1 Torr is observed between any two gauges, click **Close** on the vent valve. | - Again, open the vent valve and observe the pressure for 30 seconds to ensure the pressures are increasing at the same rate among all four gauges. If a difference of > 1 Torr is observed between any two gauges, click **Close** on the vent valve. | ||
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| - Open “Focal Plane Pumping Station” page from FRIB EXP Main → S800 → Vacuum Main (Primary Pages). | - Open “Focal Plane Pumping Station” page from FRIB EXP Main → S800 → Vacuum Main (Primary Pages). | ||
| - Open “GHS_FP_Main” and “FP_State_Buttons” pages from FRIB EXP Main → S800 → GHS Pages (Secondary Pages). | - Open “GHS_FP_Main” and “FP_State_Buttons” pages from FRIB EXP Main → S800 → GHS Pages (Secondary Pages). | ||
| - | - Plot PT1, PT2, and PT3 from the “GHS_FP_Main” page as well as BPG from the “D2686 Pumping Station” page on the same axis. | + | - Plot PT1 (S800_GHS: |
| - On the “FP_State_Buttons” page change from “Vent” mode to “Pump” mode by clicking **PUMP** in both the D2703 and D2708 tabs. | - On the “FP_State_Buttons” page change from “Vent” mode to “Pump” mode by clicking **PUMP** in both the D2703 and D2708 tabs. | ||
| - Check the box next to “Valve Controls” on the “D2686 Pumping Station” page. | - Check the box next to “Valve Controls” on the “D2686 Pumping Station” page. | ||
| - | - If the TMP is off and Foreline Valve (FV) is closed, open the Roughing Valve (RV) briefly (2 seconds) by clicking **Open** and observe the behavior of the pressure gauges. If they all decrease at the same rate, again click **Open** to begin rouging | + | - If the TMP is off and Foreline Valve (FV) is closed, open the Roughing Valve (RV) briefly (2 seconds) by clicking **Open** and observe the behavior of the pressure gauges. If they all decrease at the same rate, again click **Open** to begin roughing |
| - If the TMP is still on (this could be the case for a short vent period), turn it off and close the foreline valve (FV) before doing step 6. | - If the TMP is still on (this could be the case for a short vent period), turn it off and close the foreline valve (FV) before doing step 6. | ||
| - When the BPG reads below 200 mTorr, **Close** RV and **Open** FV. Turn the TMP on if it is not already. When the TMP is “at speed” (~30,000 RPM), **Open** the TGV. | - When the BPG reads below 200 mTorr, **Close** RV and **Open** FV. Turn the TMP on if it is not already. When the TMP is “at speed” (~30,000 RPM), **Open** the TGV. | ||
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| ===== Filling & Running FP Gaseous Detectors ===== | ===== Filling & Running FP Gaseous Detectors ===== | ||
| - | - Plot PT1, PT2, and the control valves for both D2703 (CRDC) and D2708 (IC). | + | - Plot PT1 (S800_GHS: |
| - Click **Enable Controls** for the CRDC and IC “Control Valve PID”s, then click **ENABLE** to turn on PID controls for each vessel. Each control valve should adjust to its BASE value. | - Click **Enable Controls** for the CRDC and IC “Control Valve PID”s, then click **ENABLE** to turn on PID controls for each vessel. Each control valve should adjust to its BASE value. | ||
| - If the CRDC valve remains completely open (stuck at 100%), open a probe with PV: “S800_GHS: | - If the CRDC valve remains completely open (stuck at 100%), open a probe with PV: “S800_GHS: | ||
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| - As the vessels approach their setpoints the Control Valves should begin to increase from their BASE values in order to equalize the pressure around the setpoint. Note that the CRDC pressure will change much faster than the IC pressure and has a much smaller tolerance. If PT2 reaches **45 Torr** the system will immediately enter “EMPTY” mode to prevent the foil disc from bursting. Use the figure below for reference. {{: | - As the vessels approach their setpoints the Control Valves should begin to increase from their BASE values in order to equalize the pressure around the setpoint. Note that the CRDC pressure will change much faster than the IC pressure and has a much smaller tolerance. If PT2 reaches **45 Torr** the system will immediately enter “EMPTY” mode to prevent the foil disc from bursting. Use the figure below for reference. {{: | ||
| - If PT2 reaches **44 Torr** and the control valve is not open enough to start decreasing the pressure, immediately set MFC2 to 0 sccm and allow the valve to begin decreasing the pressure before resetting MFC2 back to 8 sccm. Notify Brandon Ewert (ewert@frib.msu.edu). Continue to monitor the pressure and control valve behavior to ensure the PID is in control of the pressure. | - If PT2 reaches **44 Torr** and the control valve is not open enough to start decreasing the pressure, immediately set MFC2 to 0 sccm and allow the valve to begin decreasing the pressure before resetting MFC2 back to 8 sccm. Notify Brandon Ewert (ewert@frib.msu.edu). Continue to monitor the pressure and control valve behavior to ensure the PID is in control of the pressure. | ||
| - | - Once PT1 reaches **300 Torr**, adjust MFC1 back to 25 sccm by selecting “Go to MFC Setpoint” in the dropdown menu next to MFC1. The pressure will equilibriate | + | - Once PT1 reaches **300 Torr**, adjust MFC1 back to 25 sccm by selecting “Go to MFC Setpoint” in the dropdown menu next to MFC1. The pressure will equilibrate |
| - 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 Brandon Ewert. | - 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 Brandon Ewert. | ||
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| * Turn the knob to close the clamps | * Turn the knob to close the clamps | ||
| * Inspect the clamps and chamber flange (no gaps) to ensure that the chamber is properly sealed | * Inspect the clamps and chamber flange (no gaps) to ensure that the chamber is properly sealed | ||
| - | * Before pumping the chamber down, make sure that the scintillator is properly connected. This can be done by biasing the detector and checking the signals, either from the scalers or with a scope. One should clearly see cosmic rays; if that is not the case, the phototubes are likely | + | * Before pumping the chamber down, make sure that the scintillator is properly connected. This can be done by biasing the detector and checking the signals, either from the scalers or with a scope. One should clearly see cosmic rays; if that is not the case, the phototubes are likely |
| ====== Installing FP scintillator ====== | ====== Installing FP scintillator ====== | ||
installation_fp_sci.txt · Last modified: 2023/08/18 10:19 by noji
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