Observation of soft-x-ray spatial coherence from resonance transition radiation

Piestrup, M. A.; Boyers, D. G.; Pincus, C. I.; Li, Qiang; Hallewell, G.; Moran, M. J.; Skopik, D. M.; Silzer, R. M.; Maruyama, X.K.; Snyder, Donald D.; Rothbart, G. B.

doi:10.1103/physreva.45.1183

Cited by 40 publications

(22 citation statements)

References 30 publications

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“…Problems were connected also to the modest emittance of the available electron beams preventing the observation of the predicted sharp XTR angular cone. However, the existence of resonance effects has been established for XTR, particularly in recent experiments [5][6][7]. Qualitative agreement with calculations was found.…”

Section: Basic Theoretical Backgroundmentioning

confidence: 62%

“…Stacks of multiple foils were used in order to increase the photon flux by incoherent superposition of the single foil XTR. Later it was investigated whether resonant XTR could emphasize certain desired energies (see [5] and references cited therein and [6]). These earlier experiments focused on the observation of interference effects in the angular distribution without sufficient energy resolution of the detector.…”

Section: Basic Theoretical Backgroundmentioning

confidence: 99%

See 1 more Smart Citation

Resonant transition radiation in the X-ray region from a low emittance 855 MeV electron beam

Backe

Gampert

Grendel

et al. 1994

Z. Physik A - Hadrons and Nuclei

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Abstract. The interference of transition radiation coherently produced from a periodic stack of four polyimide foils of 7.2 btm thickness and a separation of 162 gm was investigated. This stack has been brought into the low emittance (3 rc nm rad) electron beam of the 855 MeV Mainz Microtron MAMI. Transition radiation was observed in the energy range from 2 to 15 keV with a LN2-cooled pin photodiode. A good energy resolution of 0.8keV and angular resolution of 0.15mrad was achieved simultaneously allowing for the first time to quantitatively study the interference pattern. Good agreement with theoretical calculations is found. Prospects to exploit transition radiation in the x-ray region from a low emittance electron beam as a high brilliant radiation source are discussed.

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Section: Basic Theoretical Backgroundmentioning

confidence: 62%

Section: Basic Theoretical Backgroundmentioning

confidence: 99%

Resonant transition radiation in the X-ray region from a low emittance 855 MeV electron beam

Backe

Gampert

Grendel

et al. 1994

Z. Physik A - Hadrons and Nuclei

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“…It was suggested more than fifteen years ago by Moran et al [28] that the interfoil coherence of TR, generated by relativistic electrons, constitutes a new technique for the measurement of the refractive index decrement δ(ω) in the X-ray region. A number of experiments were performed in the soft and hard X-ray region in which more or less clear interference structures were observed [28,29,30,31,32,1]. However, that δ(ω) really can be measured by such a technique has been demonstrated first by the X-ray interferometer described in this work.…”

Section: The Hard X-ray Interferometermentioning

confidence: 99%

Coherent X-rays at MAMI

et al. 2006

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Abstract. Coherent radiation in the range from soft X-rays up to hard X-rays, produced by the lowemittance electron beam of MAMI, can be used for various applications. Novel types of interferometers have been developed for the measurement of the complex index of refraction of thin self-supporting foils. For the vacuum ultraviolet and soft X-ray region the interferometer consists of two collinear undulators, and a grating spectrometer. A foil placed between the undulators causes a phase shift and an attenuation of the oscillation amplitude. The complex index of refraction has been measured at the L 2,3-absorption edges of nickel. A novel method is described for the measurement of the X-ray magnetic circular birefringence. For the hard X-ray region the interferometer consists of two foils at which the 855 MeV electron beam produces transition radiation. Distinct interference oscillations have been observed as a function of both, the photon emission angle and the distance between the foils. The refractive index decrement δ(ω) of a 2 µm thick nickel sample foil has been measured at X-ray energies around the K absorption edge at 8333 eV and at 9930 eV with an accuracy of better than 1.5 %. The line width of parametric X radiation (PXR) was measured in backward geometry with a Si single-crystal monochromator. Upper limits of the line width of 42 meV, 50 meV, and 44 meV, have been determined for the (333), (444) and (555) reflections at photon energies of 5932 eV, 7909 eV, and 9887 eV, respectively. Small angle scattering of the electrons in the crystal leads to a stochastic frequency modulation of the exponentially damped wave train which results in the line broadening. To elucidate the quest if the production of PXR is a kinematical or a dynamical process the radiation from silicon single-crystal targets, emitted close to the electron direction, has been studied. The observed interference structures and the narrow-band radiation in forward direction shows that PXR is produced in a dynamical process. .Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity) -41.60.-m Radiation by moving charges -41.50.+h X-ray beams and X-ray optics PACS.

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“…The RTR are usually obtained using the charged particles of several GeV [6,7]. The experimental studies for the electron energy from several tens to a few hundreds MeV was presented in 1980's [8,9].…”

Section: Introductionmentioning

confidence: 99%