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[en] Motivated by a proposal to create an optical helix-shaped waveguides for cold atoms and molecules, we discuss local perturbations which can create bound states in such a setting. This is known about a local slowdown of the twist; we show that a similar effect can result from a local tube protrusion or a change of the helix radius in correlation with its pitch angle
Journal
[en] Short communication
Source
Ministerstvo Rossijskoj Federatsii po Atomnoj Ehnergii, Moscow (Russian Federation); Joint Inst. for Nuclear Research, Dubna (Russian Federation); 163 p; ISBN 5-85165-068-0; 
; 1994; p. 10-11; IFVEh; Protvino (Russian Federation); 14. conference on charged particles accelerators; 14. soveshchanie po uskoritelyam zaryazhennykh chastits; Protvino (Russian Federation); 25-27 Oct 1994
; 1994; p. 10-11; IFVEh; Protvino (Russian Federation); 14. conference on charged particles accelerators; 14. soveshchanie po uskoritelyam zaryazhennykh chastits; Protvino (Russian Federation); 25-27 Oct 1994
[en] The integrals of lateral components of magnetic field in a helical electromagnetic undulator of finite length have been calculated analytically, taking into account fringe fields. It is shown that an adiabatic input provides matched injection of beam only when the number of periods is sufficiently large (Na> 6-10) and requires additional correction when precision injection is necessary. On the basis of these analytical results, several methods of forming matched field by means of correcting elements are proposed. The minimal length of such elements is about ((1)/(6)) of an undulator period. The analytical results were confirmed by numerical calculations and experimental measurements. Depending on the specific requirements, one can choose one or another type of element. For more precise formation of fringe field, elements for independent correction of only one of Bx and By field components are proposed
Journal
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002; ; CODEN NIMAER; v. 445(1-3); p. 373-378
; CODEN NIMAER; v. 445(1-3); p. 373-378
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