Long-wavelength end-effect undulator radiation (Transition Undulator Radiation)

Kincaid, B. M.

doi:10.1007/bf03185544

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…In both cases, various theoretical approaches have been used to predict the spatial and the spectral distribution of such sources [4][5][6][7]. These studies revealed that the ER source presents an aperture angle smaller than the conventional dipole source and, in the far infrared, it is more brilliant and can also be more intense than the conventional dipole source.…”

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confidence: 99%

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Spectral Distribution of Infrared Synchrotron Radiation by an Insertion Device and Its Edges: A Comparison Between Experimental and Simulated Spectra

et al. 2000

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The first measurements of the spectral distribution of infrared radiation emitted by an undulator are reported. They are compared with calculations including both velocity and acceleration terms. Measurements have been performed at the beam line SIRLOIN (Spectroscopie en InfraRouge Lointain). The agreement between the observations and this first exact numerical solution shows that the inclusion of the velocity term in the submillimeter frequency range is necessary. Moreover, structures due to undulator edges are observed in the far infrared and mid-infrared range, while the interference pattern due to redshifted harmonics of the undulator is dominating in the mid-infrared to near infrared.

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mentioning

confidence: 99%

“…This approach has been recently extended to the case of the infrared emission by a wiggler or an undulator (TUR) [5][6][7]. The radiation emitted by an insertion device is considered as being limited to the superposition of two ER sources placed at the extremities of the device.…”

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confidence: 99%

Spectral Distribution of Infrared Synchrotron Radiation by an Insertion Device and Its Edges: A Comparison Between Experimental and Simulated Spectra

et al. 2000

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“…It should be remarked that the virtual source E 2 is responsible for a field contribution known as transition undulator radiation. Typical expressions for TUR emission [26,27,28] consist of relations for the energy distribution of radiation in the far zone that account for the presence of the virtual source at z s2 alone, without considering further contributions due to other elements in the beamline, e.g. the straight sections in our case.…”

Section: Operation Of the Optical Radiatormentioning

confidence: 99%

A simple method for timing an XFEL source to high-power lasers

Geloni

Saldin

Schneidmiller

et al. 2008

Optics Communications

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We propose a technique, to be used for time-resolved pump-probe experiments, for timing an x-ray free electron laser (XFEL) to a high-power conventional laser with femtosecond accuracy. Our method takes advantage of the same electron bunch to produce both an XFEL pulse and an ultrashort optical pulse with the help of an optical radiator downstream of the x-ray undulator. Since both pulses are produced by the same electron bunch, they are perfectly synchronized. Application of cross-correlation techniques will allow to determine relative jitter between the optical pulse (and, thus, the XFEL pulse) and a pulse from an external pump-laser with femtosecond resolution. Technical realization of the proposed timing scheme uses an optical replica synthesizer (ORS) setup to be installed after the final bunch-compression stage of the XFEL. The electron bunch is modulated in the ORS setup by an external optical laser. Subsequently, it travels through the main undulator, and produces the XFEL pulse. Finally, a powerful optical pulse of coherent edge radiation is generated as the bunch passes through a long straight section and a separation magnet downstream of the main undulator. Our study shows that at a moderate (about 10%) density modulation of the electron bunch at the location of the optical radiator allows production of high power x-ray and optical pulses. Relative synchronization of these pulses is preserved by using the same mechanical support for both x-ray and optical elements transporting radiation down to the experimental area, where single-shot cross-correlation between optical pulse and pump-laser pulse is performed. We illustrate the potential of the proposed timing technique with numerical examples referring to the European XFEL facility.Comment: Version 2: Reference list updated; submitted for publication. 21 pages, 8 figure

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“…the extra characteristic length introduced in the setup. This kind of radiation is known in literature as Transition Undulator Radiation (TUR) [16,17,9,18,20]. We will retain this name although, as we will see, what we are really discussing about is edge radiation from an undulator setup.…”

Section: Transition Undulator Radiationmentioning

confidence: 99%

“…Reference [16] constitutes a theoretical basis for many other studies. Here we remind only a few [9,17,18,19,20], dealing both with theoretical and experimental issues. More recently, TUR has been given consideration in the framework of X-ray Free-Electron Laser (XFEL) projects like [21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Theory of edge radiation

Geloni,

Kocharyan,

Saldin

et al. 2008

Preprint

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We formulate a complete theory of Edge Radiation based on a novel method relying on Fourier Optics techniques. Similar types of radiation like Transition Undulator Radiation are addressed in the framework of the same formalism. Special attention is payed in discussing the validity of approximations upon which the theory is built. Our study makes consistent use of both similarity techniques and comparisons with numerical results from simulation. We discuss both near and far zone. Physical understanding of many asymptotes is discussed. Based on the solution of the field equation with a tensor Green's function technique, we also discuss an analytical model to describe the presence of a vacuum chamber. In particular, explicit calculations for a circular vacuum chamber are reported. Finally, we consider the use of Edge Radiation as a tool for electron beam diagnostics. We discuss Coherent Edge Radiation, Extraction of Edge Radiation by a mirror, and other issues becoming important at high electron energy and long radiation wavelength. Based on this work we also study the impact of Edge Radiation on XFEL setups and we discuss recent results.

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Long-wavelength end-effect undulator radiation (Transition Undulator Radiation)

Cited by 5 publications

References 7 publications

Spectral Distribution of Infrared Synchrotron Radiation by an Insertion Device and Its Edges: A Comparison Between Experimental and Simulated Spectra

Spectral Distribution of Infrared Synchrotron Radiation by an Insertion Device and Its Edges: A Comparison Between Experimental and Simulated Spectra

A simple method for timing an XFEL source to high-power lasers

Theory of edge radiation

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