SU814261A1

SU814261A1 - Undulator

Info

Publication number: SU814261A1
Application number: SU792861689A
Authority: SU
Inventors: М.М. Никитин; А.Ф. Медведев; М.Б. Моисеев
Priority date: 1979-12-29
Filing date: 1979-12-29
Publication date: 1982-02-15

Description

Изобретение относитс к ускорительной технике и св зано с использованием рел тивистских электронных пучков синхротронов и накоиителей дл генерации в магнитном ондул торе излучени любой заданной формы спектра, которое может быть использовано в различных научных исследовани х и прикладных работах.The invention relates to accelerator technology and is associated with the use of the relativistic electron beams of synchrotrons and collectors for generating in a magnetic undulator radiation of any given shape of the spectrum that can be used in various scientific studies and applied research.

Известна конструкци магнитного ондул тора , в котором нараметры всех магнитных секций равны между собой 1. Вообще любые магнитные ондул торы, плоские или спиральные, обычно выполн ли с одинаковым размером магнитных секций или одинаковым шагом спирали - дл спирального ондул тора. При этом мощность ондул торного излучени приходитс иа первую гармонику частоты колебаний электрона при движении в такой системе, а ширина этой спектральюй линии обратно пропорциональна числу магнитных секций . Получнть заданную форму спектра ондул торного излучени в таких конструкци х принципиально новозможно.The known structure of a magnetic undulator, in which the dimensions of all magnetic sections are equal to each other 1. In general, any magnetic undulators, flat or spiral, are usually made with the same size of magnetic sections or the same pitch of the helix for a spiral undulator. In this case, the power of undulator radiation comes from the first harmonic of the oscillation frequency of an electron moving in such a system, and the width of this spectral line is inversely proportional to the number of magnetic sections. Obtaining a given shape of the spectrum of undulator radiation in such structures is fundamentally possible.

Нанболее близким к изобретению технически .м решением вл етс ондул тор, содержащий магнитные секции, расположенные последовательно и соосно на пути пучка зар женных частиц 2. При этом длины секций не равны между собой.Technically, the solution closer to the invention is an undulator containing magnetic sections arranged in series and coaxially in the path of the beam of charged particles 2. At the same time, the lengths of the sections are not equal to each other.

В такой конструкции в общем случае можно генерировать ондул торное излучение сплошного спектра. Длннноволнова и коротковолнова границы этого спектра определ ютс соответственно наибольшим и наименьшим периодом магнитного пол ондул тора.In such a construction, it is generally possible to generate undulator radiation of the continuous spectrum. The long and short wavelengths of this spectrum are determined by the largest and smallest magnetic field of the undulator, respectively.

К недостаткам такой конструкции относ тс очень больша длина ондул тора дл генерации ондул торного излучени заданной формы сиектра, поскольку магнитные секции различной длины расположены только последовательно друг за другом , в то врем как длины пр молинейных промежутков в спнхротронах ограничены, при этом невозможно получить на таком ондул торе заданную форму спектра излучени в любом диапазоне длин волн ондул торного излучени .The disadvantages of this design include the very large length of the undulator for generating the undulator radiation of a given shape of the spectrum, since the magnetic sections of different lengths are arranged only sequentially one after the other, while the lengths of the straight gaps in the sphronts are limited. A dielectric waveguide has a given shape of the radiation spectrum in any wavelength range of undulator radiation.

Целью изобретени вл етс уменьшение габаритов устройства (продольного размера ондул тора).The aim of the invention is to reduce the size of the device (the longitudinal size of the undulator).

Claims

The goal is achieved by the fact that in a known undulator containing magnetic sections arranged sequentially and coaxially in the path of a beam of charged particles, additional magnetic sections are introduced, whose length is a multiple of the main sections, the magnetic sections are placed on the main sections to form a multilayer structure. FIG. 1 is a schematic representation of a nlosk magnetic undulator; in fig. 2 - the trajectory of the electron in a magnetic field, created along the axis of this structure. An undulator can be composed of electromagnets with autonomous. With a current of a Caledonian magnetic section, as well as the presentation of not only ilosky, but also a spiral inductor. An electron beam is transmitted along the nanodol axis of the undulator axis. The particles move in a magnetic field H (x), where x is the longitudinal coordinate of the electron in the undulator. According to the principle of sunnerosity of fields, we can write: H (X 2 I; 5W f NN (H, C.sin 1-1 / where, / 2; HI is the normalized value of the contribution of the corresponding amplitude N is the number of magnetic sections of a multiple length stacked on top of each other; PI is the length of the i-th section. The intensity of radiation dl to the solid angle element dQ with frequency ω is equal to, where RQ is the distance from the radiation point to the observer. Consequently, the more magnetic sections of multiple length are laid on each other, the more complex the spectrum the radiation we get, which also depends on the magnitude of the magnetic field lengths This is especially important when installing an undulator in a linear gap of electronic drives, as it allows to generate a radiated controlled spectrum in the ultraviolet region of the spectrum that is particularly interesting and important for research.A invention claims an undulator containing magnetic sections consecutively and coaxially in the path of a beam of charged particles, this is due to the fact that, in order to reduce the size of the undulator, additional magnetic sections, whose lengths are a multiple of Line ocHOBiibix sections, the magnetic core section has at seki.n x to form a multilayer structure. Sources of information taken into account in the examination 1. Alferov DF, et al. Preprint, L 118, FI AP USSR, 1975.

2. USSR Author's Certificate oVo 573101, cl. And 05 And 7/00, 02.02.76 (prototype).

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