Intensity of electron channeling radiation, and occupation lengths in diamond crystals

Nething, U.; Galemann, M.; Genz, H.; Höfer, M.; Hoffmann-Stascheck, P.; Hormes, J.; Richter, A.; Sellschop, J.P.F.

doi:10.1103/physrevlett.72.2411

Cited by 19 publications

(5 citation statements)

References 11 publications

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“…A systematic error of 30 % has been quadratically added to the fit errors. Data points at 5.2 and 9.0 MeV taken from [25], curve denoted by Korol et It can be seen from figure 5 (a) and (b) that large deviations of the theoretical predictions for the dechanneling lengths exist which, consequently, are also expected for the difference in the transition rates λ de (x) − λ re (x). However, such a possibility is partly taken into account in the best fit procedure by the parameter A in equation (3.1).…”

Section: Analysis Procedures and Resultsmentioning

confidence: 97%

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Channeling experiments at planar diamond and silicon single crystals with electrons from the Mainz Microtron MAMI

Backe

Lauth

Thi³

2018

J. Inst.

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Line structures were observed for (110) planar channeling of electrons in a diamond single crystal even at a beam energy of 180 MeV . This observation motivated us to initiate dechanneling length measurements as function of the beam energy since the occupation of quantum states in the channeling potential is expected to enhance the dechanneling length. High energy loss signals, generated as a result of emission of a bremsstrahlung photon with about half the beam energy at channeling of 450 and 855 MeV electrons, were measured as function of the crystal thickness. The analysis required additional assumptions which were extracted from the numerical solution of the Fokker-Planck equation. Preliminary results for diamond are presented. In addition, we reanalyzed dechanneling length measurements at silicon single crystals performed previously at the Mainz Microtron MAMI at beam energies between 195 and 855 MeV from which we conclude that the quality of our experimental data set is not sufficient to derive definite conclusions on the dechanneling length. Our experimental results are below the predictions of the Fokker-Planck equation and somewhat above the results of simulation calculations of A. V. Korol and A. V. Solov'yov et al. on the basis of the MBN Explorer simulation package. We somehow conservatively conclude that the prediction of the asymptotic dechanneling length on the basis of the Fokker-Planck equation represents an upper limit.

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Section: Analysis Procedures and Resultsmentioning

confidence: 97%

“…A systematic error of 30 % has been quadratically added to the fit errors. Data points at 5.2 and 9.0 MeV taken from[25], curve denoted byKorol et al. derived from a calculation (12.01 ± 0.40) µm at 855 MeV [2, table 1] by linear interpolation to the origin.…”

mentioning

confidence: 99%

Channeling experiments at planar diamond and silicon single crystals with electrons from the Mainz Microtron MAMI

Backe

Lauth

Thi³

2018

J. Inst.

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“…At present, channeling radiation ͑CR͒ is one of the candidates for such an x-ray source. Indeed, CR up to ϳ0.1 photon per e Ϫ per sr. has been observed, 1 demonstrating that CR can be used as a practical x-ray source.…”

Section: Introductionmentioning

confidence: 91%

Theory of diffracted channeling radiation

et al. 2001

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Monochromatic x-ray emission is predicted for MeV channeled electrons/positrons. The mechanism of this radiation is intuitively understood as diffraction of virtual channeling radiation into the direction of the Bragg angles with respect to the electron beam. Our numerical calculations predict that spectral density of the emitted x rays is about ten times larger than that of parametric x-ray radiation.

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“…Refs. [14,21] with beam energies in the 5 -54 MeV range. Some measured values for the (1 → 0) transition in the (110) plane are shown in Table 1.…”

Section: Multiple Scattering Of Channeled Particlesmentioning

confidence: 99%

Spectral brilliance of channeling radiation at the ASTA photoinjector

Sen

Lynn

2014

Int. J. Mod. Phys. A

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We study channeling radiation from electron beams with energies under 100 MeV. We introduce a phenomenological model of dechanneling, correct non-radiative transition rates from thermal scattering, and discuss in detail the population dynamics in low order bound states. These are used to revisit the X-ray properties measured at the ELBE facility in Forschungszentrum Dresden-Rosenstock (FZDR), extract parameters for dechanneling states, and obtain satisfactory agreement with measured photon yields. The importance of rechanneling phenomena in thick crystals is emphasized. The model is then used to calculate the expected X-ray energies, linewidths and brilliance for forthcoming channeling radiation experiments at Fermilab's ASTA photoinjector. * tsen@fnal.gov

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Intensity of electron channeling radiation, and occupation lengths in diamond crystals

Cited by 19 publications

References 11 publications

Channeling experiments at planar diamond and silicon single crystals with electrons from the Mainz Microtron MAMI

Channeling experiments at planar diamond and silicon single crystals with electrons from the Mainz Microtron MAMI

Theory of diffracted channeling radiation

Spectral brilliance of channeling radiation at the ASTA photoinjector

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