Development of a modified wiggler for higher harmonic lasing of a free-electron laser

Asakawa, M.; Inoue, N.; Mima, Kunioki; Nakai, S.; Imasaki, K.; Fujita, Masayuki; Chen, J.; Yamanaka, Chiyoe; Nakao, Naoya; Agari, T.; Asakuma, T.; Moon, Ahsa; Ohigashi, Nobuhisa; Minamiguchi, T.; Tsunawaki, Yoshiaki

doi:10.1016/0168-9002(94)01269-5

Cited by 21 publications

(7 citation statements)

References 10 publications

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“…It is done by the shimming by ferromagnetic materials and it can enhance the radiation of high harmonics. [66][67][68][69][70][71][72] The measurements of the strength of the field harmonics in these special undulators showed ≈20-30% of the main field amplitude. [70,73,74] In the common planar undulators, used in X-ray FELs, which we will study in what follows, the amplitude of the field harmonic dH 0 is small, d ≲ 0.05.…”

Section: Spontaneous Radiation From Undulatorsmentioning

confidence: 99%

“…[66][67][68][69][70][71][72] The measurements of the strength of the field harmonics in these special undulators showed ≈20-30% of the main field amplitude. [70,73,74] In the common planar undulators, used in X-ray FELs, which we will study in what follows, the amplitude of the field harmonic dH 0 is small, d ≲ 0.05. However, special bi-harmonic undulators exist, where the amplitude of the field harmonic can reach 10-30% of the main field, d ≈ 0.1-0.3; [66][67][68][69][70][71][72][73][74] usually a radiation field of the undulator can be theoretically reproduced by taking into account the first and third field harmonics.…”

Section: Spontaneous Radiation From Undulatorsmentioning

confidence: 99%

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Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Zhukovsky

2021

Annalen der Physik

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A theoretical analysis of the radiation in X-ray free electron lasers (FELs) LCLS, PAL-XFEL, SwissFEL, as well as SACLA, FLASH 2, and European XFEL is presented. Major losses in FELs are analytically accounted for and analyzed, using exact expressions for the Bessel factors in terms of the generalized Bessel functions. This allows distinguishing the contributions of key parameters and accounting for the losses individually for each harmonic, considering higher sensitivity of the electron-photon interaction at higher harmonic wavelengths. The harmonic power evolution along FELs and the spectral width of the radiation lines is studied. The theoretical results are analyzed and are compared with the available experimental data for the FEL experiments. The harmonic generation and amplification in the FELs are modeled and studied with the harmonic lasing self-seed (HLSS) with separate buncher and radiator, and the results are compared with those for SASE. The spectral properties of the radiation are analytically calculated and compared with the measured spectral characteristics. The advantages of HLSS versus SASE FEL are elucidated in the examples of FLASH2, European XFEL, and SwissFEL. The prospected radiation properties of LCLS-II FEL are analyzed and the possibilities of using harmonics in this FEL are proposed.

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Section: Spontaneous Radiation From Undulatorsmentioning

confidence: 99%

Section: Spontaneous Radiation From Undulatorsmentioning

confidence: 99%

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Zhukovsky

2021

Annalen der Physik

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“…Однако идеальное синусоидальное магнитное поле не удовлетворяет уравнениям Максвелла во всем пространстве зазора ондулятора, и в реальных устройствах всегда присутствуют высшие гармонические составляющие поля. Кроме того, в ондуляторах с постоянными магнитами иногда специально создают бигармоническое магнитное поле с помощью шиммирования ферромагнитными материалами [15][16][17][18][19][20][21]. Гармоники поля позволяют получить усиленное по сравнению с обычным излучение высших гармоник ОИ [20,22].…”

Section: Introductionunclassified

“…Гармоники поля позволяют получить усиленное по сравнению с обычным излучение высших гармоник ОИ [20,22]. Амплитуда гармоник поля может доходить до ∼ 20−30% основного поля ондулятора [19,23,24]. Влияние гармоник поля на излучение реальных электромагнитных ондуляторов изучалось, например, в [25,26], а также в ондуляторах с постоянными магнитами и с электромагнитами в [27][28][29][30].…”

Section: Introductionunclassified

Генерация Гармоник В Экспериментах С Лазерами На Свободных Электронах В Рентгеновском Диапазоне --- Теоретический Анализ

Zhukovskii¹

2021

Журнал Технической Физики

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Analytical description of the generation of harmonics of the undulator radiation (UR) in free electron lasers (FELs) is given for various FEL experiments in the X-ray band. The expressions for the spectral line shape and intensity are written explicitly in terms of the generalized Bessel and Airy functions with account for the electron energy spread, beam sizes and emittances, spectral line split and non-periodic magnetic fields. The presented theory describes well the radiation spectral properties and harmonic intensities in all studied FEL experiments: SACLA, LCLS, PAL-XFEL, SwissFEL et al., in various conditions with the radiation in wide range of frequencies, covering hard X-rays.

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“…In the modified wiggler, appropriate controlling of the amplitude and phase of harmonic wiggler field increase the bunching of harmonic and improves its radiation. Due to the simplicity of this harmonic wiggler which consists of conventional planar wiggler and high permeability shims, various kinds of modified wiggler field can be developed easily and economically (Asakawa et al 1995;1996). Suitable wiggler schemes known as nonconventional wigglers, to provide both the saturated power at fundamental and its harmonics, have been suggested for various purposes within the framework of FEL studies.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear third harmonic radiation in thermal free electron laser with modified wiggler

Bazouband

Maraghechi

2015

J. Plasma Phys.

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Simulation of free electron laser (FEL) with modified wiggler consisting of a conventional planar wiggler with third harmonic field component is presented. A set of self consistent nonlinear differential equations is derived and solved numerically by Runge–Kutta method. The optimum amplitudes of fundamental and third harmonic wiggler filed are obtained to increase the third harmonic radiation in comparison with conventional wiggler and also to have lower electron beam energy compared to conventional wiggler with the same wavelength. For the thermal effect the axial energy spread of electron beam, without any spread in the transverse velocity, is assumed. A peculiar region is found in which there is a sharp increase of the radiation amplitude. Thermal effect of the electron beam was found to be irregular in this peculiar region.

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Development of a modified wiggler for higher harmonic lasing of a free-electron laser

Cited by 21 publications

References 10 publications

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Генерация Гармоник В Экспериментах С Лазерами На Свободных Электронах В Рентгеновском Диапазоне --- Теоретический Анализ

Nonlinear third harmonic radiation in thermal free electron laser with modified wiggler

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