Numerical investigation of plasma evolution in magnetically insulated transmission lines

Sotnikov, V. I.; Presura, R.; Bauer, Bruno; Oliver, B.V.

doi:10.1109/ppc.2003.1277944

Cited by 3 publications

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Operation regimes of magnetically insulated transmission lines

Presura

Bauer

Esaulov

et al.

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)

Self Cite

View full text Add to dashboard Cite

Magnetically Insulated Transmission Lines (MITLs) are commonly used for efticient power transport in the vacuum section of pulsed power devices. Plasma forming from metal surfaces l i m i t s the power transmitted to a load through M1TL.s. It eventually shunts the load, producing so-called MITL closure.Fundamental experiments are being performed on high intensity power transmission through coaxial cylindrical vacuum transmission lines. A current that rises to 1 MA in 100 ns is driven through the MITLs by a 2 -W , 2 -0 pulse generator (Zebra). The condition of the MITL surfaces is carefnlly controlled and characterized before each shot. Differential B-dot probes measure the current before and after the MITL, to determine the time of gap closure. Optical imaging and laser diagnostics observe the plasma evolution in the gap with time and space resolution.The radial gap of the cylindrical vacuum transmission line has been systematically varied, and the time of MITL closure measured. They increase with the radial gap size in a discontinuous manner. Critical transitions (discontinuous jumps in closure time) appear to separate distinct MITL operation regimes. This is the first experiment and data set of this kind known to the authors.Electromagnetic-particle-in-cell and radiationmagnetohydrodynamic computer modeling assist the experiment, being used to refine the experimental design and to interpret the results.

show abstract

Operation regimes of magnetically insulated transmission lines

Presura

Bauer

Esaulov

et al.

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)

Self Cite

View full text Add to dashboard Cite

show abstract

Investigation of Plasma Evolution in a Coaxial Small-Gap Magnetically Insulated Transmission Line

Иванов

Laca

Bauer

et al. 2004

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

Precision electron flow measurements in a disk transmission line.

Martin

Savage

Pointon

et al. 2008

View full text Add to dashboard Cite

An analytic model for electron flow in a system driving a fixed inductive load is described and evaluated with particle in cell simulations. The simple model allows determining the impedance profile for a magnetically insulated transmission line given the minimum gap desired, and the lumped inductance inside the transition to the minimum gap. The model allows specifying the relative electron flow along the power flow direction, including cases where the fractional electron flow decreases in the power flow direction. The electrons are able to return to the cathode because they gain energy from the temporally rising magnetic field. The simulations were done with small cell size to reduce numerical heating. An experiment to compare electron flow to the simulations was done. The measured electron flow is ~33% of the value from the simulations. The discrepency is assumed to be due to a reversed electric field at the cathode because of the inductive load and falling electron drift velocity in the power flow direction. The simulations constrain the cathode electric field to zero, which gives the highest possible electron flow.

show abstract

Numerical investigation of plasma evolution in magnetically insulated transmission lines

Cited by 3 publications

References 5 publications

Operation regimes of magnetically insulated transmission lines

Operation regimes of magnetically insulated transmission lines

Investigation of Plasma Evolution in a Coaxial Small-Gap Magnetically Insulated Transmission Line

Precision electron flow measurements in a disk transmission line.

Contact Info

Product

Resources

About