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Model of High Current Breakdown from Cathode Field Emission in Aged Wire Chambers.

DE2004826767

Publication Date	2004
Personal Author	Boyarski, A. M.
Page Count	14
Abstract	Observing single electron pulses provides insight into the mechanism that leads to sudden high current jumps (breakdown) in aged wire chambers. This single electron activity is found to be consistent with the Fowler-Nordheim equation for field emission of electrons from a cathode surface in a high electric field. The high electric field arises from the positive ion buildup on a very thin insulating layer on the cathode surface. A model is presented to explain the transient behavior of single electron pulses in response to abrupt changes in chamber ionization, as well as the steady state rate during a long term aging run. The model is based on properties of the insulating layer (dielectric constant, conductivity, and hole-mobility) as well as the Fowler-Nordheim equation.
Keywords	Models Aging Breakdown Cathodes Electric fields Field emission Hole mobility Ionization Mathematical models Permittivity Electri conductivity Cathode field emission Aged wire chambers High current breakdown Fowler-Nordheim theory
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200508

Model of High Current Breakdown from Cathode Field Emission in Aged Wire Chambers.

Model of High Current Breakdown from Cathode Field Emission in Aged Wire Chambers.
DE2004826767

Publication Date	2004
Personal Author	Boyarski, A. M.
Page Count	14
Abstract	Observing single electron pulses provides insight into the mechanism that leads to sudden high current jumps (breakdown) in aged wire chambers. This single electron activity is found to be consistent with the Fowler-Nordheim equation for field emission of electrons from a cathode surface in a high electric field. The high electric field arises from the positive ion buildup on a very thin insulating layer on the cathode surface. A model is presented to explain the transient behavior of single electron pulses in response to abrupt changes in chamber ionization, as well as the steady state rate during a long term aging run. The model is based on properties of the insulating layer (dielectric constant, conductivity, and hole-mobility) as well as the Fowler-Nordheim equation.
Keywords	Models Aging Breakdown Cathodes Electric fields Field emission Hole mobility Ionization Mathematical models Permittivity Electri conductivity Cathode field emission Aged wire chambers High current breakdown Fowler-Nordheim theory
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200508