How intense is parametric x radiation?

Asano, Sumitada; Endo, I.; Harada, Minoru; Ishii, Satoshi; Kobayashi, Takashi; Nagata, Takahiko; Muto, M.; Yoshida, K.; Nitta, H.

doi:10.1103/physrevlett.70.3247

Cited by 52 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1. In this geometry no PXR is observed from the surface (100) planes since, as has been previously observed [12,13], PXR is not generated whenever the selection rules [22] for ordinary x-ray diffraction forbid it. These rules exclude the (222) and (100) reflections from face centered cubic crystals such as Si.…”

mentioning

confidence: 87%

See 1 more Smart Citation

Polarized angular distributions of parametric x radiation and vacuum-ultraviolet transition radiation from relativistic electrons

et al. 1995

Phys. Rev. E

View full text Add to dashboard Cite

We present quantifiable images of the angular distributions (AD's) of parametric x radiation (PXR), and vacuum-ultraviolet transition radiation (vuv TR) from 230 MeV electrons interacting with a silicon crystal. Both AD's are highly polarized. The vuv TR and optical TR data provide measurements of the beam energy and effective divergence angle. Using these quantities and separately known values of the electronic susceptibility igoi, we show that the measured PXR AD is in good agreement with the predictions of single crystal theory. Our analysis suggests a method to measure iyoi using PXR AD's.

show abstract

mentioning

confidence: 87%

“…Predictions [1,2] of the spectral and angular features of the radiation have been generally verified for single crystals [5 -13].However, some large quantitative discrepancies between theory and experiment have been shown with regard to the effects of multiple scattering (MS) [12,13] and mosaicity [13].…”

mentioning

confidence: 99%

Polarized angular distributions of parametric x radiation and vacuum-ultraviolet transition radiation from relativistic electrons

et al. 1995

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…n; (12) with allowance made for the radiation attenuation in the crystalline target, the factor L has the form [48] L = Tel: : ~ 1 [1exp ( -Te I~. n; (12) with allowance made for the radiation attenuation in the crystalline target, the factor L has the form [48] L = Tel: : ~ 1 [1exp ( -Te I~.…”

Section: Angular Distribution Of Pxr Yield and Photon Energymentioning

confidence: 99%

Investigations and Properties of PXR

Shchagin

2002

Electron-Photon Interaction in Dense Media

View full text Add to dashboard Cite

show abstract

“…The spectral and angular properties of PXR produced by electrons mostly in silicon and diamond crystals have been studied over a large range of electron energies from a few MeV up to several GeV. For recent investigations we refer to [3][4][5][6][7][8][9][10][11][12][13] and references therein. In general, the experimental results are well described by a so-called kinematical theory [3].…”

mentioning

confidence: 99%

Polarization of Parametric X Radiation

et al. 1997

View full text Add to dashboard Cite

Polarization properties of parametric x radiation (PXR) produced by E 0 80.5 MeV electrons interacting with a 13 mm thick silicon crystal have been investigated. The direction and the degree of the linear polarization of PXR observed at about 20 ± with respect to the electron beam direction were determined by means of a novel method exploiting directional information of the photoelectric effect in a charge coupled device consisting of 6.8 3 6.8 mm pixels. Comparison of the results with a newly derived theoretical expression exhibits very good agreement if on top of the basic interaction process underlying PXR effects decreasing the polarization are taken into account. [S0031-9007(97)04605-X] PACS numbers: 41.60. -m, 07.85. -m, 41.75.HtParametric x radiation (PXR) is a highly monochromatic radiation produced by a relativistic charged particle traversing a crystal. It originates from the coherent superposition of the electromagnetic waves emitted due to the polarization of crystal atoms periodically distributed along the particle trajectory. For highly relativistic charged particles (Lorentz factor g 1 1 E 0 ͞mc 2 ¿ 1) the PXR intensity is concentrated predominantly within a small angular cone well separated from the electron beam. While PXR has already been predicted about three decades ago [1], it was first observed only in 1985 [2] and has attracted considerable interest ever since. The spectral and angular properties of PXR produced by electrons mostly in silicon and diamond crystals have been studied over a large range of electron energies from a few MeV up to several GeV. For recent investigations we refer to [3-13] and references therein. In general, the experimental results are well described by a so-called kinematical theory [3].So far the polarization character of PXR is largely unexplored. There exists only one experimental investigation [14,15] using 900 MeV electrons and a 370 mm Si crystal in which for three discrete points of the (220) reflex the linear polarization was measured. Away from the center of the reflex a high degree of polarization was found. The polarization was claimed [14] to have a radial distribution in analogy toČerenkov radiation. Since the applied theoretical approach [16] to the data does not contain explicit relations regarding the polarization properties of PXR, the quoted agreement [14,15] between experiment and theory appears to be fortuitous. It has been the aim of the work described in the present article to determine the polarization degree and direction of PXR for experimental conditions similar as in [14,15] applying a novel experimental technique which facilitates a continuous coverage of a substantial fraction of the diffraction pattern and to derive for the first time the appropriate expressions for the observables describing the polarization properties of PXR.Within the framework of the kinematical theory [3] it can be shown [17] that PXR is-under ideal conditions-

show abstract

How intense is parametric x radiation?

Cited by 52 publications

References 6 publications

Polarized angular distributions of parametric x radiation and vacuum-ultraviolet transition radiation from relativistic electrons

Polarized angular distributions of parametric x radiation and vacuum-ultraviolet transition radiation from relativistic electrons

Investigations and Properties of PXR

Polarization of Parametric X Radiation

Contact Info

Product

Resources

About