87 research outputs found
Coherent bremsstrahlung in a bent crystal
Radiation spectrum from high energy in a bent crystal with arbitrary
curvature distribution along the longitudinal coordinate is evaluated, based on
the stationary phase approximation. For a uniformly bent crystal a closed-form
expression for the spectrum is derived. Features such as sharp end of spectrum
and volume reflection turnover at beginning of the spectrum are discussed. The
coherence length in a bent crystal appears to depend only on the crystal
geometry and not on the electron or photon energies, which is essential for
interpretation of the results. Estimates of non-dipole radiation and multiple
scattering effects are given. The value for the crystal bending angle at which
the dipole coherent bremsstrahlung theory holds best appears to be .Comment: 15 pages, 10 figures; published versio
Comments on theory of volume reflection and radiation in bent crystals
Recent theoretical results on charged particle interaction with planarly
oriented thin bent crystals are reviewed, with the emphasis on dynamics in the
continuous potential. Influence of boundary conditions on the volume-reflected
beam profile is discussed. Basic properties of coherent bremsstrahlung in a
bent crystal are highlighted.Comment: 10 pages, 4 figure
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