title: Steering of a sub-GeV electron beam through planar channeling enhanced by rechanneling.
abstract: We report the observation of efficient steering of a 855 MeV electron beam at MAMI (MAinzer MIkrotron) facilities by means of planar channeling and volume reflection in a bent silicon crystal. A 30.5  μm thick plate of (211) oriented Si was bent to cause quasimosaic deformation of the (111) crystallographic planes, which were used for coherent interaction with the electron beam. The experimental results are analogous to those recorded some years ago at energy higher than 100 GeV, which is the only comparable study to date. Monte Carlo simulations demonstrated that rechanneling plays a considerable role in a particle's dynamics and hinders the spoiling of channeled particles. These results allow a better understanding of the dynamics of electrons subject to coherent interactions in a bent silicon crystal in the sub-GeV energy range, which is relevant for realization of innovative x-ray sources based on channeling in periodically bent crystals.
authors.affiliation: INFN Sezione di Ferrara, Dipartimento di Fisica e Scienze della Terra, Università di Ferrara Via Saragat 1, 44100 Ferrara, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Mazzolari
authors.affiliation: INFN Sezione di Ferrara, Dipartimento di Fisica e Scienze della Terra, Università di Ferrara Via Saragat 1, 44100 Ferrara, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Bagli
authors.affiliation: INFN Sezione di Ferrara, Dipartimento di Fisica e Scienze della Terra, Università di Ferrara Via Saragat 1, 44100 Ferrara, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Bandiera
authors.affiliation: INFN Sezione di Ferrara, Dipartimento di Fisica e Scienze della Terra, Università di Ferrara Via Saragat 1, 44100 Ferrara, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Guidi
authors.affiliation: Institut für Kernphysik der Universität Mainz, Fachbereich Physik, Mathematik und Informatik, D-55099 Mainz, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Backe
authors.affiliation: Institut für Kernphysik der Universität Mainz, Fachbereich Physik, Mathematik und Informatik, D-55099 Mainz, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Lauth
authors.affiliation: Research Institute for Nuclear Problems, Belarusian State University, Bobruiskaya street, 11, Minsk 220030, Belarus.
authors.forename: V
authors.initials: V
authors.lastname: Tikhomirov
authors.affiliation: Università dell'Insubria, via Valleggio 11, 22100 Como, Italy and INFN Sezione di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Berra
authors.affiliation: Università dell'Insubria, via Valleggio 11, 22100 Como, Italy and INFN Sezione di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Lietti
authors.affiliation: Università dell'Insubria, via Valleggio 11, 22100 Como, Italy and INFN Sezione di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Prest
authors.affiliation: INFN Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Vallazza
authors.affiliation: INFN Laboratori Nazionali di Legnaro, Viale dell'Università 2, 35020 Legnaro, Italy and Dipartimento di Fisica, Università di Padova, Via Marzolo 8, 35131 Padova, Italy.
authors.forename: D
authors.initials: D
authors.lastname: De Salvador