skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The System of Nanosecond 280-KeV He+ Pulsed Beam

Abstract

At Fast Neutron Research Facility, the 150 kV-pulses neutron generator is being upgraded to a 280-kV-pulsed-He beam for time-of-flight Rutherford backscattering spectrometry. It involves replacing the existing beam line elements by a multicusp ion source, a 400-kV accelerating tube, 45{sup o}-double focusing dipole magnet and quadrupole lens. The multicusp ion source is a compact filament-driven of 2.6 cm in diameter and 8 cm in length. The current extracted is 20.4 {micro}A with 13 kV of extraction voltage and 8.8 kV of Einzel lens voltage. The beam emittance has found to vary between 6-12 mm mrad. The beam transport system has to be redesigned based on the new elements. The important part of a good pulsed beam depends on the pulsing system. The two main parts are the chopper and buncher. An optimized geometry for the 280 keV pulsed helium ion beam will be presented and discussed. The PARMELA code has been used to optimize the space charge effect, resulting in pulse width of less than 2 ns at a target. The calculated distance from a buncher to the target is 4.6 m. Effects of energy spread and phase angle between chopper and buncher have been included in the optimization ofmore » the bunch length.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
881961
Report Number(s):
SLAC-PUB-11847
TRN: US200619%%121
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Prepared for Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; BEAM EMITTANCE; BEAM TRANSPORT; DIPOLES; FAST NEUTRONS; FOCUSING; GEOMETRY; HELIUM IONS; ION SOURCES; MAGNETS; NEUTRON GENERATORS; OPTIMIZATION; QUADRUPOLES; RUTHERFORD BACKSCATTERING SPECTROSCOPY; SPACE CHARGE; TARGETS; Accelerators,ACCPHY

Citation Formats

Junphong, P, Ano, V, Lekprasert, B, Suwannakachorn, D, Thongnopparat, N, Vilaithong, T, /Chiang Mai U., Wiedemann, H, and /SLAC /SLAC, SSRL. The System of Nanosecond 280-KeV He+ Pulsed Beam. United States: N. p., 2006. Web.
Junphong, P, Ano, V, Lekprasert, B, Suwannakachorn, D, Thongnopparat, N, Vilaithong, T, /Chiang Mai U., Wiedemann, H, & /SLAC /SLAC, SSRL. The System of Nanosecond 280-KeV He+ Pulsed Beam. United States.
Junphong, P, Ano, V, Lekprasert, B, Suwannakachorn, D, Thongnopparat, N, Vilaithong, T, /Chiang Mai U., Wiedemann, H, and /SLAC /SLAC, SSRL. Mon . "The System of Nanosecond 280-KeV He+ Pulsed Beam". United States. https://www.osti.gov/servlets/purl/881961.
@article{osti_881961,
title = {The System of Nanosecond 280-KeV He+ Pulsed Beam},
author = {Junphong, P and Ano, V and Lekprasert, B and Suwannakachorn, D and Thongnopparat, N and Vilaithong, T and /Chiang Mai U. and Wiedemann, H and /SLAC /SLAC, SSRL},
abstractNote = {At Fast Neutron Research Facility, the 150 kV-pulses neutron generator is being upgraded to a 280-kV-pulsed-He beam for time-of-flight Rutherford backscattering spectrometry. It involves replacing the existing beam line elements by a multicusp ion source, a 400-kV accelerating tube, 45{sup o}-double focusing dipole magnet and quadrupole lens. The multicusp ion source is a compact filament-driven of 2.6 cm in diameter and 8 cm in length. The current extracted is 20.4 {micro}A with 13 kV of extraction voltage and 8.8 kV of Einzel lens voltage. The beam emittance has found to vary between 6-12 mm mrad. The beam transport system has to be redesigned based on the new elements. The important part of a good pulsed beam depends on the pulsing system. The two main parts are the chopper and buncher. An optimized geometry for the 280 keV pulsed helium ion beam will be presented and discussed. The PARMELA code has been used to optimize the space charge effect, resulting in pulse width of less than 2 ns at a target. The calculated distance from a buncher to the target is 4.6 m. Effects of energy spread and phase angle between chopper and buncher have been included in the optimization of the bunch length.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2006},
month = {5}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: