Journal
PHYSICAL REVIEW E
Volume 104, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.104.L023201
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Funding
- Department of Energy, National Nuclear Security Administration [DE-NA0003842, DE-NA0003278]
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The gas-puff Z-pinch is a well-known source of x-rays and/or neutrons, but it is highly susceptible to the magneto-Rayleigh-Taylor instability (MRTI). Mitigation strategies for MRTI include density profile tailoring and axial pre-magnetization, which can be additive in reducing energy loss and improving yield. By adding a second liner to stabilize the implosion of the gas liner, the initial axial magnetic field can be reduced, ultimately leading to a more attractive source for intense neutrons or fusion applications.
The gas-puff Z-pinch is a well-known source of x-rays and/or neutrons, but it is highly susceptible to the magneto-Rayleigh-Taylor instability (MRTI). Approaches to MRTI mitigation include density profile tailoring, in which nozzles are added or modified to alter the acceleration trajectory, and axial pre-magnetization, in which perturbations are smoothed out via magnetic field line tension. Here, we present two-dimensional magnetohydrodynamic simulations of loads driven by an 850 kA, 160 ns driver that suggest these mitigation strategies can be additive. The initial axial magnetic field, Bz0, to stabilize a 2.5-cm-radius Ne gas liner imploding onto an on-axis deuterium target can be reduced from 0.7 T to 0.3 T by adding a second liner with a radius of 1.25 cm. Because MRTI mitigation tends to increasingly lower yield with higher Bz0, the use of a lower field is advantageous. Here, we predict a reduction in yield penalty from >100x with the single liner to <10x with a double liner. A premagnetized, triple nozzle gas puff could therefore be an attractive source for intense neutrons or other fusion applications.
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