By conducting experiments for granite and sandstone samples under different conditions,such as voltage amplitude and electrodes gap, the discharge characteristicsof high voltage pulses inside the rocks with increasing their applied number havebeen investigated. In each of the experiments, a certain value for voltage amplitudeand electrodes gap is set separately and then, pulses are applied on same surface ofthe rocks continuously. The time dependent voltage between the electrodes, the currentin plasma and the transient states around the electrode tips are measured andrecorded separately when each of the pulses is applied. By means of the wave formsof the voltage and the current, variation laws of the discharging time and the energyrelease into the plasma with increasing applied pulses number have been obtained.The relation between the number of applied pulses and the critical condition of dischargeinside of the rocks has been found. Further, the relation between the numberof applied pulses required to discharge and the voltage amplitude has been also analyzed.The reasons of why increasing applied pulses number has such effects ondischarge characteristics of them inside the granite and sandstone samples have beenfound and demonstrated. ? 2017 Author(s). All article content, except where otherwisenoted, is licensed under a Creative Commons Attribution (CC BY) license.
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