| 摘要 |
Low frequency broadband energy is separated from an accelerator structure fundamental radio frequency (rf) energy in the broadband electromagnetic energy within specific frequency bands. The particle beam accelerator electromagnetic arc detection system comprises employing signal lines extended from existing particle beam accelerator diagnostic sensors to electrical filter circuits. Depending on the application requirements, filters are grouped by types such as low-pass, high pass, or bandpass types. The bandpass filters are employed in banks in a preferred embodiment to reject all electrical signals except those within the band of interest. The increase in broadband electromagnetic energy radiated through the accelerator structure as an arc begins to form is readily detectable in the rf spectrum at frequencies below 10 MHz. The electrical signals received by the filters are subsequently passed to detectors which produce a direct current (DC) level proportional to the strength of the signal. The outputs from the rf detectors are then fed to processing logic. When the selected set of rf detectors becomes active, the processor declares an arc condition and produces appropriate signals to inform the main system processor which initiates protective action (e.g., crowbar the high voltage by power supply protection circuitry).
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