Volume Reflection of a Proton Beam in a Bent Crystal

Journal Article · Fri Oct 06 04:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.144801· OSTI ID:20860915

Ivanov, Yu M; Petrunin, A A; Skorobogatov, V V; Gavrikov, Yu A; Gelamkov, A V; Lapina, L P; Schetkovsky, A I; Vavilov, S A ^[1]; Baranov, V I; Chesnokov, Yu A; Afonin, A G; Baranov, V T; Chepegin, V N ^[2]; Guidi, V ^[3]; Scandale, W ^[4]; Vomiero, A ^[5]

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1. Petersburg Nuclear Physics Institute, 188300 Gatchina, Leningral Region (Russian Federation)
2. Institute of High Energy Physics, 142281 Protvino, Moscow Region (Russian Federation)
3. Dipartimento di Fisica and INFN, Universita di Ferrara, Via Saragat 1/C, 44100 Ferrara (Italy)
4. European Organization for Nuclear Research, CERN, CH-1211 Geneve 23 (Switzerland)
5. Laboratori Nazionali di Legnaro, Viale dell'Universita 2, 35020 Legnaro (PD), Italy, and CNR-INFM and Brescia University, Via Valotti 9, 25133 Brescia (Italy)

Volume reflection predicted in the mid-1980s by Taratin and Vorobiev has been observed for the first time in the interactions of a 70 GeV proton beam with a short bent crystal. Incident protons deviate from convex atomic planes in the bulk of the crystal as a result of coherent interaction with bent lattice around the tangency point of particle trajectory with a curved atomic plane. The deflection angle 2{theta}{sub R} was found to be (39.5{+-}2.0) {mu}rad, or (1.65{+-}0.08){theta}{sub c} in terms of the critical angle for channeling. The process has a large probability with respect to channeling and takes place in the angular range equal to the bend angle of atomic planes. It could possibly open new fields of application of crystals in high-energy particle beam optics.

• OSTI ID: 20860915
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM OPTICS
CHANNELING
CRYSTALS
GEV RANGE 10-100
PROBABILITY
PROTON BEAMS
PROTONS
REFLECTION
TRAJECTORIES