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DE2010974354

Publication Date	2010
Personal Author	Tan, C.
Page Count	25
Abstract	The neutralization of H(sup -) beam with a gas like Xe is an important part of low energy beam transport (LEBT). It is well known that choppers which use an electric field when placed in the LEBT strongly affects the neutralization of H(sup -). The question then naturally arises as to whether a magnetic chopper has a better neutralization time than an electric chopper. To answer this question, a simple 1-space, 1 time drift-diffusion model of H(sup -) beam in Xe gas has been used to calculate the neutralization times for the following scenarios: (a) a region initially cleared of Xe+ ions with an electric field but partially neutralized outside, (b) a region within and outside the chopper which is initially partially neutralized.
Keywords	Beam transport Electric fields Xenon Diffusion Ions Neutralization
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Fermi National Accelerator Lab., Batavia, IL. Accelerator Div.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	201020
Contract Number	AC02-76CH03000

Simple Drift-Diffusion Model for Calculating the Neutralization Time of H(sup -) in Xe Gas for Choppers placed in the LEBT.

Simple Drift-Diffusion Model for Calculating the Neutralization Time of H(sup -) in Xe Gas for Choppers placed in the LEBT.
DE2010974354

Publication Date	2010
Personal Author	Tan, C.
Page Count	25
Abstract	The neutralization of H(sup -) beam with a gas like Xe is an important part of low energy beam transport (LEBT). It is well known that choppers which use an electric field when placed in the LEBT strongly affects the neutralization of H(sup -). The question then naturally arises as to whether a magnetic chopper has a better neutralization time than an electric chopper. To answer this question, a simple 1-space, 1 time drift-diffusion model of H(sup -) beam in Xe gas has been used to calculate the neutralization times for the following scenarios: (a) a region initially cleared of Xe+ ions with an electric field but partially neutralized outside, (b) a region within and outside the chopper which is initially partially neutralized.
Keywords	Beam transport Electric fields Xenon Diffusion Ions Neutralization
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Fermi National Accelerator Lab., Batavia, IL. Accelerator Div.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	201020
Contract Number	AC02-76CH03000