IPAC'10 - List of Authors (Vomiero, A. V.)

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Vomiero, A. V.

Paper	Title	Page
THPD052	Manipulation of Negatively Charged Beams via Coherent Effects in Bent Crystals	4398
	V. Guidi, E. Bagli, A. Mazzolari INFN-Ferrara, Ferrara A.G. Afonin, Y.A. Chesnokov, V.A. Maisheev, I.A. Yazynin IHEP Protvino, Protvino, Moscow Region S. Baricordi, P. Dalpiaz, M. Fiorini, D. Vincenzi UNIFE, Ferrara D. Bolognini, S. Hasan, M. Prest Università dell'Insubria & INFN Milano Bicocca, Como G. Della Mea, R. Milan INFN/LNL, Legnaro (PD) A.S. Denisov, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, L.G. Malyarenko, V. Skorobogatov, V.M. Suvorov, S.A. Vavilov PNPI, Gatchina, Leningrad District S. Golovatyuk, A.D. Kovalenko, A.M. Taratin JINR, Dubna, Moscow Region A. Mattera INFN MIB, MILANO W. Scandale CERN, Geneva S. Shiraishi Enrico Fermi Institute, University of Chicago, Chicago, Illinois E. Vallazza INFN-Trieste, Trieste A. V. Vomiero INFM-CNR, Istituto Nazionale di Fisica della Materia - Consiglio Nazionale delle Ricerche, Brescia
	New results in coherent interaction of negatively-charged particles with bent crystals showed unprecedentedly and significantly high efficiency to manipulate such beams, in the same way as for positively charged particles. Key feature under experimental attainment was the usage of high-quality suitably thin silicon crystals. We experimentally tested crystals Vs. 150 GeV negative pions at external lines of CERN SPS. We observed planar channeling at full deflection angle 30% high single-pass efficiency and large acceptance (about 20μrad). Moreover in the axial case, we reached more than 90% deflection efficiency and larger acceptance (about 60μrad). We also observed volume reflection in a bent crystal, at more than 70% single-pass efficiency with such a wide acceptance as the bending angle. At last, volume reflection by several planes in a single bent crystal was successfully tested with very high efficiency (about 80%). In summary both channeling and volume reflection modes appear to be useful technique for the manipulation of negatively charged beams, e.g. for collimation in the new generation of high intensity accelerators. The UA9 collaboration

Paper

Title

Page

THPD052

Manipulation of Negatively Charged Beams via Coherent Effects in Bent Crystals

4398

V. Guidi, E. Bagli, A. Mazzolari
INFN-Ferrara, Ferrara
A.G. Afonin, Y.A. Chesnokov, V.A. Maisheev, I.A. Yazynin
IHEP Protvino, Protvino, Moscow Region
S. Baricordi, P. Dalpiaz, M. Fiorini, D. Vincenzi
UNIFE, Ferrara
D. Bolognini, S. Hasan, M. Prest
Università dell'Insubria & INFN Milano Bicocca, Como
G. Della Mea, R. Milan
INFN/LNL, Legnaro (PD)
A.S. Denisov, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, L.G. Malyarenko, V. Skorobogatov, V.M. Suvorov, S.A. Vavilov
PNPI, Gatchina, Leningrad District
S. Golovatyuk, A.D. Kovalenko, A.M. Taratin
JINR, Dubna, Moscow Region
A. Mattera
INFN MIB, MILANO
W. Scandale
CERN, Geneva
S. Shiraishi
Enrico Fermi Institute, University of Chicago, Chicago, Illinois
E. Vallazza
INFN-Trieste, Trieste
A. V. Vomiero
INFM-CNR, Istituto Nazionale di Fisica della Materia - Consiglio Nazionale delle Ricerche, Brescia

New results in coherent interaction of negatively-charged particles with bent crystals showed unprecedentedly and significantly high efficiency to manipulate such beams, in the same way as for positively charged particles. Key feature under experimental attainment was the usage of high-quality suitably thin silicon crystals. We experimentally tested crystals Vs. 150 GeV negative pions at external lines of CERN SPS. We observed planar channeling at full deflection angle 30% high single-pass efficiency and large acceptance (about 20μrad). Moreover in the axial case, we reached more than 90% deflection efficiency and larger acceptance (about 60μrad). We also observed volume reflection in a bent crystal, at more than 70% single-pass efficiency with such a wide acceptance as the bending angle. At last, volume reflection by several planes in a single bent crystal was successfully tested with very high efficiency (about 80%). In summary both channeling and volume reflection modes appear to be useful technique for the manipulation of negatively charged beams, e.g. for collimation in the new generation of high intensity accelerators.

The UA9 collaboration