High-voltage Doorknob Capacitors: A Promise Of Reliability In The Long-term Operation Of Synchrotron Radiation Sources

High-voltage doorknob capacitors:Long-term operation of synchrotron radiation sources

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As a major national scientific and technological infrastructure supporting cutting-edge multidisciplinary research, the value of synchrotron radiation sources lies in their high uptime and sustained, stable photon output. An unplanned outage can disrupt dozens of experiments, resulting in immeasurable loss of scientific opportunities. High-voltage doorknob capacitors, core components of high-voltage power supplies and pulse systems, are crucial for their long-term reliability and lifespan, directly impacting the overall operational performance and scientific output of the facility.

Harsh operating conditions of capacitors in synchrotron radiation sources:

Continuous high-voltage stress: In the electron gun high-voltage power supply and the RF system DC link, capacitors operate at their rated high voltage for extended periods, placing a constant strain on the dielectric strength of the dielectric.

Frequent pulse shocks: In the pulsed magnet power supply, capacitors are required to charge and discharge with high currents dozens of times per second, withstanding severe current and thermal stress shocks.

Striving for extreme maintenance cycles: Synchrotron radiation sources typically have short annual maintenance schedules, which means that critical internal components must have a trouble-free operating time far exceeding this, avoiding field replacement during operation.


Our longevity gene: the ultimate pursuit of materials, craftsmanship and quality:

Aging-Resistant Ceramic Dielectric: Utilizing highly stable ceramic materials with rigorously optimized proportions and doping, this material effectively suppresses dielectric aging and ion migration under high electric field strength, ensuring highly stable capacitance over a decade.

Reinforced Electrodes and Connections: Advanced co-firing of metallized electrodes and ceramic dielectric creates a strong chemical bond, resisting thermal fatigue and electrical stress. Multiple reinforcement processes are employed for the screw terminals and internal electrodes to prevent loosening due to vibration.

Excellent Thermal Stability and Heat Dissipation: Low dissipation factor reduces self-heating at the source. Combined with the efficient heat dissipation of a metal housing or epoxy resin encapsulation, core temperature rise is kept low. A rule of thumb states that for every 10°C reduction in operating temperature, life doubles.

Strict Screening and Testing: We utilize accelerated life testing (e.g., 1000 hours at 85°C/rated voltage) and advanced reliability statistical models to ensure our products meet the most stringent reliability requirements, with predicted failure rates (FIT) below industry standards.