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The new High Repetition Rate (HRR) CERN DC Spark System has been used toinvestigate the current and voltage time structure of a breakdown. Simulationsindicate that vacuum breakdowns develop on ns timescales or even less. Anexperimental benchmark for this timescale is critical for comparison tosimulations. The fast rise time of breakdown may provide some explanation ofthe particularly high gradients achieved by low group velocity, and narrowbandwidth, accelerating structures such as the T18 and T24. Voltage and currentmeasurements made with the previous system indicated that the transientresponses measured were dominated by the inherent capacitances and inductancesof the DC spark system itself. The bandwidth limitations of the HRR system arefar less severe allowing rise times of approximately 12ns to be measured.

Measurement of the dynamic response of the CERN DC spark system and preliminary estimates of the breakdown turn-on time