Long-term reliability of high-voltage doorknob capacitors in continuously operating spectrometers

Long-term reliability of high-voltage doorknob capacitors in continuously operating spectrometers

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As core equipment supporting cutting-edge research in chemistry, biology, and materials science, the value of nuclear magnetic resonance (NMR) instruments lies in their long-term, stable, and highly reproducible data output. An unplanned downtime or insidious performance degradation can disrupt important kinetic experiments or render data from multiple samples incomparable. High-voltage doorknob capacitors, core components of high-voltage power supplies and radio frequency systems, are directly impacted by their long-term reliability and lifespan consistency, ensuring the continuity of scientific research and data quality.

The Harsh Operating Conditions of Capacitors in Nuclear Magnetic Resonance (NMR) Instruments

Continuous High-Voltage Stress: In the DC link of the magnet power supply and RF power amplifier, 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 RF pulse power supplies, capacitors must undergo frequent charge and discharge cycles at experimental repetition rates (up to hundreds of Hz), withstanding the shocks of current and thermal stress.

Striving for Extreme Maintenance Intervals: NMR instruments typically have short annual maintenance schedules, requiring critical internal components to maintain a trouble-free operating time far exceeding this.

The Ultimate Pursuit of Materials, Craftsmanship, and Quality
To ensure absolute reliability throughout the lifecycle of an MRI scanner, our high-voltage door handle capacitors undergo comprehensive reinforcement:

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 strengths, ensuring highly stable capacitance over a decade.

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