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UV-VIS Spectroscopy of Anode-Initiated Vacuum Flashover Plasmas
Raimi Clark;Michael Mounho;William Brooks;Matthew Hopkins;Jacob Stephens;Andreas Neuber
Temporally resolved emission spectroscopy capturing the light emission from 200 to 800 nm is utilized to assess the behavior of pulsed anode-initiated surface flashover in vacuum. The limiting failure mechanism at vacuum-insulator interfaces tends to be surface flashover since it occurs at field thresholds lower than bulk insulator breakdown or bridging plain vacuum gaps. Of particular interest ar...Show More
Statistical characterization of anode-initiated vacuum surface flashover
Michael Mounho;Raimi Clark;William Brooks;Matthew Hopkins;Andreas Neuber;Jacob Stephens
Statistical characterization of vacuum surface flashover is achieved by electrically stressing a positive 45° wedge of cross-linked polystyrene (Rexolite) with a fast, high-voltage pulse. The insulator is placed between a hemispherical anode with a 2 cm radius extending into a parallel plate planar cathode. This configuration is intended to confine the flashover plasma to a ~1 cm wide region on th...Show More
Investigations of Vacuum Insulator Flashover in Pulsed Power Systems
Matthew Hopkins;William Brooks;Raimi Clark;Zakari Echo;Ronald Goeke;Christopher Moore;Michael Mounho;Andreas Neuber;Jacob Stephens;Jacob Young
2023 30th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)
Year: 2023 | Conference Paper |
This presentation describes a new effort to better understand insulator flashover in high current, high voltage pulsed power systems. Both experimental and modeling investigations are described. Particular emphasis is put upon understand flashover that initiate in the anode triple junction (anode-vacuum-dielectric).Show More
Exploring the Basic Physical Mechanisms of Cathode- and Anode-Initiated High-Voltage Surface Flashover
William Brooks;Raimi Clark;Jacob Young;Matthew Hopkins;James Dickens;Jacob Stephens;Andreas Neuber
Surface flashover in vacuum imposes a substantial physical limit on modern, large-scale pulsed power. One of the ramifications is a minimum size requirement for new machines, which in itself becomes a hard barrier to the modernization and improvement of existing infrastructure. Pulsed power topologies require the physical mechanisms of both anode- and cathode-initiated flashover to be considered. ...Show More
Temporally resolved light emission and optical emission spectroscopy of surface flashover in vacuum
Raimi Clark;Jacob Young;William Brooks;Matthew Hopkins;John Mankowski;Jacob Stephens;Andreas Neuber
Early light emission provides information about the dominant mechanisms culminating in vacuum surface flashover (anode-initiated vs. cathode-initiated) for particular geometries. From experimental evidence gathered elsewhere, for the case of an insulator oriented at 45° with respect to the anode, anode-initiated flashover is believed to dominate since the field at the anode triple point is roughly...Show More
Sensitivity of PBX 9501 and PBX 9502 to Milling Operations
Joshua Williams;Ethan Weeks;Raimi Clark;Scott Watkins;James Dickens;John Mankowski;Jacob Brinkman;Andreas Neuber
2021 IEEE Pulsed Power Conference (PPC)
Year: 2021 | Conference Paper |
Explosive driven pulsed power performance benefits from modern polymer-bonded explosives. In practical application, high precision in the dimensional shape is required, and high machining speeds are desired. The limits of machining speed, driven mainly by the thermal response of the energetic material, are investigated. Specifically, the thermal response of PBX 9501 (95% HMX, 2.5% Estane, 2.5% BDN...Show More
Ignition Mechanisms of Polymer Bonded Explosives During Drilling
R. Clark;R. J. Lee;A.T. Hewitt;T. Buntin;D. Barnett;J. C. Dickens;W. A. Harrison;E. Tucker;J. J. Mankowski;A. A. Neuber
The drilling behavior of polymer bonded high explosives (HE) is investigated by varying drilling parameters and analyzing resultant forces and thermal response. A modified drill press enables remote operation and precise control of cutting speed, feed, and depth. To acquire temperature at the cutting interface a K-Type thermocouple is inserted in the coolant holes of thru-coolant drill bits and ep...Show More
High-Speed Imaging of Polymer-Bonded Explosives under Mechanical Stresses
R. Lee;A. Hewitt;R. Clark;H. Hudyncia;T. Buntin;D. Barnett;J.C. Dickens;J.J. Mankowski;W. A. Harrison;E. Tucker;A.A. Neuber
The impact of mechanical stresses on polymer bonded high explosives, HE, is investigated. High-Speed photography in the visible spectrum, VIS, as well as mid-wave infrared (MWIR) of HE during small diameter drilling and controlled skidding is presented. Controlled drilling into the HE enables recording the size and temperature of shavings under varying feed and speeds. Even at very high drill spee...Show More
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