Safe Power Supply of Neutron Accelerator High-Voltage Power Supply in Material Inspection and Waste Processing
The safe power supply of a neutron accelerator in material inspection and waste processing keeps the beam energy on the working point. The inspection and the processing depend on the stable neutron output, so the supply holds the accelerating voltage and the dose is verified by the calibrated detector.
The accelerating voltage stability sets the neutron energy. The voltage is held by the loop, the energy is consistent, and the inspection sensitivity is repeatable.
The beam current regulation sets the neutron flux. The current is controlled, the dose is integrated, and the processing throughput matches the plan.
The shielding and the interlock cover the operation area. The radiation monitor and the door switch participate, the beam is gated, and the exposure is bounded.
The target cooling handles the beam power. The target temperature is controlled, the cooling flow matches the dissipation, and the target life is maintained.
The protection covers the accelerator faults. The overvoltage and the overcurrent are handled, the tube is protected, and the recovery follows the defined sequence.
The commissioning verifies the neutron output and the safety chain. The detector is calibrated, the dose profile is measured, and the interlock test is recorded.
Field maintenance focuses on the accelerator and the target state. The neutron output is verified periodically, and the anomaly is located from the record.
The insulation test of the transformer follows the standard flow. The withstand test and the insulation resistance test are done separately, the conditions differ, and the mixed result is not reliable.
The input current waveform of the PFC is observed on the oscilloscope. The high distortion gives the large harmonic, and the measured waveform guides the parameter adjustment.
The resonance point of the input filter avoids the working frequency. The filter resonance amplifies the specific frequency interference, and the resonance frequency is designed outside the switching frequency.
The efficiency curve of the wide input range has the valley. The efficiency drops when the input deviates from the nominal value, and the full-range evaluation is weighted by the actual voltage distribution.
The transition of the constant-voltage constant-current switch is smooth. The overshoot of the voltage and the current during the switch damages the load, and the switch logic is verified on the oscilloscope.
The long-term output accuracy relies on the periodic calibration. The reference drift is the main cause of the accuracy drop, and the calibration interval matches the drift rate.
The micro-current measurement demands the shielding and the insulation. The leakage and the space interference affect the reading, and the insulation and the shield of the path are handled first.
The temperature drift of the current sense resistor affects the accuracy. The large current heats the resistor, the resistance drifts, and the compensation or the low-drift selection follows.
The resolution of the high-precision setting conflicts with the noise. The high resolution gives the visible step noise, and the stepping method and the filter are matched.
The load line characteristic is decided by the output impedance. The high impedance gives the poor load regulation, the low impedance affects the stability, and the value follows the load type.
The transient control of the mode switch uses the ramp. The sudden change of the output parameter causes the overshoot, the ramp or the rate limit is added, and the transient is controlled.
The abnormal record during the test has the same value. The phenomenon, the action and the recovery are recorded, and the abnormal record is the material for the design improvement.
The first power-on check follows the fixed order. The wiring is checked before the power, the low voltage before the high voltage, the no-load before the loaded, and the reversed order causes the accident.
The parameter change during the field debug is kept. The content, the reason and the effect of the change are recorded, and the rollback and the trace are supported.
The re-test after the transport is not skipped. The vibration loosens the fastener and shifts the component, and the re-test items match the factory acceptance.
The long-running equipment gets the periodic inspection. The temperature, the noise, the vibration and the drift are recorded, the trend is built, and the anomaly is found early.
The test fixture life is managed. The worn fixture shifts the test result, the fixture is replaced by the count or the period, and the calibration verifies the state.
The environment condition during the test is recorded. The temperature and the humidity affect the insulation and the accuracy result, and the condition is written into the report.
The report conclusion corresponds to the data. The conclusion is derived from the data, the conclusion is not made from the incomplete data, and the data integrity is checked first.
The operator training follows the standard work instruction. The step, the criterion and the abnormal handling are consistent with the actual action.
The traceability system manages by the batch. The test data of each unit is linked to the serial number, and the problem is traced back to the specific batch and stage.
The field measurement of the power factor requires the calibrated wattmeter. The wattmeter is verified against the standard source, and the measured value is compared with the calculated value.
The load regulation measurement is done at the defined load step. The output change between the no-load and the rated load is recorded, and the regulation value is judged against the specification.
The test bench grounding and the shielding are done first. The interference enters through the ground loop and the space path, the bus bar cross section decides the reading stability, and the shield continuity decides the ripple measurement quality.
The calibration interval follows the usage frequency. The instrument used daily is calibrated every three months, the instrument used occasionally every six months, and the certificate is archived for the field trace.
The electronic load differs from the real load. The resistive load changes with the temperature, the electronic load carries the equivalent capacitance, and the conclusion is verified under both conditions.
The test cycle and the test depth conflict on the line. The tight cycle leaves the item untested, the long test cuts the throughput, and the failure risk decides the allocation between the line test and the sample test.
The aging condition follows the field data. The temperature, the humidity and the grid fluctuation are set from the record, the accelerated condition shows the real margin, and the distorted condition gives the useless life data.
