IPAC2013 - List of Authors (Batygin, Y.K.)

Paper	Title	Page
TUPWA064	Suppression of Halo Formation in FODO Focusing Channel with Nonlinear Focusing	1850
	Y.K. Batygin, A. Scheinker LANL, Los Alamos, New Mexico, USA
	Averaging method was applied to analyze focusing properties of a quadrupole FODO channel with inserted multipole lenses. General expression for averaged focusing potential is obtained as a function of position of multipole lenses with respect to FODO quadrupole lenses. Obtained results were applied to the problem of intense beam transport in combined FODO structure. Numerical and analytical treatments of high-brightness beam dynamics with suppressed space-charge induced halo formation are presented.

TUPWA065	Design Issues of Low Energy Beam Transport	1853
	Y.K. Batygin LANL, Los Alamos, New Mexico, USA
	Low energy beam transport (LEBT) is an important element of ion accelerator facilities to provide beam matching between ion source and accelerator structure, perform required beam diagnostics measurements, dispose extra particle components, and create necessary time structure of the beam. Most of existing ion LEBT are based on solenoid focusing. Design criteria for ion LEBT with magnetostatic focusing are discussed. Dynamics in LEBT is optimized in terms of maximizing acceptance of the channel and transported beam current, and minimizing spherical aberrations in solenoids and space charge induced beam emittance growth.

TUPWA066	Space Charge Neutralization of Low Energy H⁻ Beam	1856
	Y.K. Batygin, I. Draganić, C.M. Fortgang, G. Rouleau LANL, Los Alamos, New Mexico, USA
	LANSCE Ion Source Test Stand is used for systematic study of H⁻ source performance and details of low energy beam transport. It includes cesiated, multicusp-field, surface production H⁻ ion source, focusing solenoids, slit-collector emittance stations, 4.5o bending magnet, and electrostatic deflector. Series of experiments were performed to measure space charge neutralization of low energy H⁻ beam. Measurements were done for 80 keV and 35 keV H⁻ beams at various pressure of residual gas. Results of measurements are compared with results of beam dynamics simulations to determine level of space charge neutralization. Applicability of theoretical models of beam neutralization is discussed.

TUPWA067	Beam Emittance Growth Effects in High-intensity RFQ	1859
	Y.K. Batygin, R.W. Garnett, L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	Beam dynamics in an RFQ are strongly affected by coupling between transverse and longitudinal particle oscillations. The adiabatic process of high-intensity bunched beam formation results in equipartitioning in the RFQ, which determines the longitudinal beam emittance. Avoiding parametric resonances is an important design criterion to prevent significant emittance growth of the beam. Manufacturing errors can result in beam emittance growth and reduction of beam transmission. This paper will present the results of a study where analytical and numerical evaluations were performed to determine the effect of the aforementioned factors on beam quality in a high-current RFQ.

Paper

Title

Page

Suppression of Halo Formation in FODO Focusing Channel with Nonlinear Focusing

1850

Y.K. Batygin, A. Scheinker
LANL, Los Alamos, New Mexico, USA

Averaging method was applied to analyze focusing properties of a quadrupole FODO channel with inserted multipole lenses. General expression for averaged focusing potential is obtained as a function of position of multipole lenses with respect to FODO quadrupole lenses. Obtained results were applied to the problem of intense beam transport in combined FODO structure. Numerical and analytical treatments of high-brightness beam dynamics with suppressed space-charge induced halo formation are presented.

TUPWA065

Design Issues of Low Energy Beam Transport

1853

Y.K. Batygin
LANL, Los Alamos, New Mexico, USA

Low energy beam transport (LEBT) is an important element of ion accelerator facilities to provide beam matching between ion source and accelerator structure, perform required beam diagnostics measurements, dispose extra particle components, and create necessary time structure of the beam. Most of existing ion LEBT are based on solenoid focusing. Design criteria for ion LEBT with magnetostatic focusing are discussed. Dynamics in LEBT is optimized in terms of maximizing acceptance of the channel and transported beam current, and minimizing spherical aberrations in solenoids and space charge induced beam emittance growth.

TUPWA066

Space Charge Neutralization of Low Energy H⁻ Beam

1856

Y.K. Batygin, I. Draganić, C.M. Fortgang, G. Rouleau
LANL, Los Alamos, New Mexico, USA

LANSCE Ion Source Test Stand is used for systematic study of H⁻ source performance and details of low energy beam transport. It includes cesiated, multicusp-field, surface production H⁻ ion source, focusing solenoids, slit-collector emittance stations, 4.5o bending magnet, and electrostatic deflector. Series of experiments were performed to measure space charge neutralization of low energy H⁻ beam. Measurements were done for 80 keV and 35 keV H⁻ beams at various pressure of residual gas. Results of measurements are compared with results of beam dynamics simulations to determine level of space charge neutralization. Applicability of theoretical models of beam neutralization is discussed.

TUPWA067

Beam Emittance Growth Effects in High-intensity RFQ

1859

Y.K. Batygin, R.W. Garnett, L. Rybarcyk
LANL, Los Alamos, New Mexico, USA

Beam dynamics in an RFQ are strongly affected by coupling between transverse and longitudinal particle oscillations. The adiabatic process of high-intensity bunched beam formation results in equipartitioning in the RFQ, which determines the longitudinal beam emittance. Avoiding parametric resonances is an important design criterion to prevent significant emittance growth of the beam. Manufacturing errors can result in beam emittance growth and reduction of beam transmission. This paper will present the results of a study where analytical and numerical evaluations were performed to determine the effect of the aforementioned factors on beam quality in a high-current RFQ.