Abstract
Magnetically insulated transmission lines (MITLs), which could transfer power density up to $\mathrm{TW}/{\mathrm{cm}}^{2}$, are one of the most important technologies in pulsed power. In pulsed power systems for the $Z$-pinch fusion or radiography, a long MITL acts as a transmission line as well as a spatial isolation between load and driver. The length of MITLs in such systems will be up to a few, even tens of meters. However, the anode and cathode (A-K) gap is only a few centimeters to make the centering of the MITL's electrodes be one of the most challenging issues. Cathodes of long coaxial MITLs, such as that of Hermes-III and RITS, are fixed at the low voltage end while keeping the other end free of support. However, such a method will be very difficult for longer MITLs due to gravity and engineering reasons. An interesting question for such MITL design is to find a way to position the electrodes to the ideal position while hardly damaging the power flow. It is also a very practical concern in the construction of large pulsed-power facilities. In this paper, a high inductive helical supported MITL in a 10-stage linear transformer driver system is investigated. Both experiments and particle-in-cell simulations show that magnetic insulation is well established and power flow could be transmitted to load efficiently.
Highlights
In large scale pulse drivers, loads are usually placed several meters away from the primary energy storage
In low impedance drivers, such as the Z machine [2], the Primary Test Stand (PTS) [3], and future petawatt-class driver [4], the Magnetically insulated transmission lines (MITLs) usually works as the joint part of identical modules
The inner electrode of the MITL is fixed at the ground potential end, and the other end, where the particle beam is generated, is usually free of support
Summary
In large scale pulse drivers, loads are usually placed several meters away from the primary energy storage. While in high impedance facilities which usually drive particle beam diodes, such as Hermes-III [5], RITS [6], and the linear transformer driver (LTD) system in this paper, the MITL usually has coaxial structure. In these facilities, the inner electrode of the MITL is fixed at the ground potential end, and the other end, where the particle beam is generated, is usually free of support. The premagnetizing loop should break or work as a high impedance passage Motivated by these questions, we investigate the possibility of supporting MITLs with high inductive helical on a 10-stage LTD system.
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