installation_fp_sci
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installation_fp_sci [2023/05/08 16:39] noji |
installation_fp_sci [2023/05/11 13:15] pereira |
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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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