| As a new technology of pulsed power, the linear transformer driver (LTD) technology offers many advantages, such as compact and versatile, when it is compared with other traditional pulsed power technologies. Therefore, it has become a huge potential dominace in the fields of pulsed power and attracts the relevant institutions in recent years. However, some challenges such as achieving the stringent demands of the trigger technology, must be surmounted when the LTD technology is used for constructing large-scale pulsed-power accelerators. In order to overcome the challenge, which has important significance and application value, two kinds of triggering technology used for large-scale switches were studied.One kind of the triggering technology, which is based on inductive transformer, is named as LTD-trigger. LTD-trigger has a similar structure to LTD device and operates reversely relative to LTD. However, the size of LTD-trigger is much smaller than LTD and can output multiple trigger pulsed voltages with one single primary high-voltage pulsed power supply. The working principle of LTD-trigger was analyzed by establishing an equivalent circuit model and constructing an experimental prototype which is able to generate 20 trigger pulses. The structure design of the experimental prototype was introduced and the parameters of the equivalent circuit model of the prototype was calculated and analysised with the dimensions of the prototype. The simplified equivalent circuit model of the prototype was established and analysised in order to study how will the parameters of LTD-trigger exercise influence on the output trigger pulses.The equivalent circuit model of the prototype was simulated by the software PSPICE and the performance characteristic of the prototype was studied in a series of experiments. The simulating and experimental results showed a good performance of synchronization among the output trigger pulses of different cavities and were conformed to the calculating results of the simplified equivalent circuit model.The other kind of the triggering technology, as a novel self-trigger technology originated from the LTD-trigger, is called the self-trigger LTD technology. It is based on the principle of inductive coupling of magnetic core and through the way of adding some coils which wind around the magnetic core in the trigger-LTD cavities, the induced voltages will be generated in the coils while the trigger-LTD cavities are fired. The induced voltages can be used as trigger signals and are introduced into subsequent normal LTD cavities through the transmission line. According the way of triggering several LTD cavities with one trigger signal from outside, the number of the trigger signals from outside can be greatly reduced.Through the simulation of self-trigger LTD module which was composed of 60 1-MA cavities with the software of PSPICE, the feasibility of self-trigger LTD technology was tested and analyzed. In the simulation, the impacts of there parameters, which are the delay between the trigger signals from outside、the number of LTD cavities in one group and the delay time of the transmission line between adjacent normal LTD cavities, on the output of the self-trigger LTD module were studied. What’s more, the voltage pulses across the switches before the closure of the different cavities and the influence of the jitter of the gas switches on the output current to the matched load are considered in the simulation. The performance of the self-trigger LTD module was discussed while the LTD cavities were insulated by vacuum.An experimental prototype was constructed to verify the the self-trigger LTD technology. The design of all the parts of the prototype were introduced and the gas switches which were used in the prototype were explained, too. The equivalent circuit model of the LTD cavity in the prototype was established and simulated and one LTD cavity in the prototype was experimented. The simulating results were well matched with the experimental results. |
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