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1.
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Crystal for slow extraction loss-reduction of the SPS electrostatic septum
/ Esposito, Luigi Salvatore (CERN) ; Addesa, Francesca (INFN, Rome) ; Afonin, Alexander (Serpukhov, IHEP) ; Bestman, Patrick (CERN) ; Borg, Johan (Imperial Coll., London) ; Butcher, Mark (CERN) ; Calviani, Marco (CERN) ; Chesnokov, Yuri (Serpukhov, IHEP) ; Denisov, Alexander (St. Petersburg, INP) ; Di Castro, Mario (CERN) et al.
The use of a bent crystal was investigated in order to reduce the losses at the CERN Super Proton Synchrotron (SPS) electrostatic septum (ZS) during the slow extraction of 400 GeV/c protons toward the North Area. The crystal, installed a few meters upstream of the ZS, bends protons that would otherwise impinge on the ZS wires. [...]
CERN-ACC-2019-179.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPMP028
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP028
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2.
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Demonstration of loss reduction using a thin bent crystal to shadow an electrostatic septum during resonant slow extraction
/ Velotti, Francesco (CERN) ; Addesa, Francesca (INFN, Rome) ; Afonin, Alexander (Serpukhov, IHEP) ; Bestmann, Patrick (CERN) ; Borg, Johan (Imperial Coll., London) ; Butcher, Mark (CERN) ; Calviani, Marco (CERN) ; Chesnokov, Yuri (Serpukhov, IHEP) ; Denisov, Alexander (St. Petersburg, INP) ; Di Castro, Mario (CERN) et al.
A proof-of-principle experiment demonstrating the feasibility of using a thin, bent crystal aligned upstream of an extraction septum (ES) to increase the efficiency of the third-integer resonant slow extraction process has been carried out at the CERN Super Proton Synchrotron (SPS). With the primary aim of reducing the beam loss and induced radio-activation of the SPS, the crystal was aligned to both the beam and the septum to reduce by up to 40% the beam intensity impinging the ES and increase the intensity entering the external transfer line. [...]
CERN-ACC-2019-218.-
2019 - 5 p.
- Published in : 10.18429/JACoW-IPAC2019-THXXPLM2
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THXXPLM2
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3.
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Manipulation of Negatively Charged Beams via Coherent Effects in Bent Crystals
/ Scandale, Walter (CERN) ; Guidi, Vincenzo (INFN, Ferrara) ; Bagli, Enrico (INFN, Ferrara) ; Mazzolari, Andrea (INFN, Ferrara) ; Afonin, Alexander (Serpukhov, IHEP) ; Chesnokov, Yuri (Serpukhov, IHEP) ; Maisheev, Vladimir (Serpukhov, IHEP) ; Yazynin, Igor (Serpukhov, IHEP) ; Baricordi, Stefano (Ferrara U.) ; Dalpiaz, Pietro (Ferrara U.) et al.
We review the experimental evidences we recorded with volume reflection and planar and axial channelings with negatively charged particles beam. High deflection efficiency was observed in all cases [...]
2010
External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.THPD052
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4.
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High-efficiency deflection of high-energy negative particles through axial channeling in a bent crystal
/ Scandale, Walter (CERN) ; Vomiero, Alberto (INFM, Brescia) ; Bagli, E (INFN, Ferrara ; Ferrara U.) ; Baricordi, Stefano (INFN, Ferrara ; Ferrara U.) ; Dalpiaz, Pietro (INFN, Ferrara ; Ferrara U.) ; Fiorini, Massimiliano (INFN, Ferrara ; Ferrara U.) ; Guidi, Vincenzo (INFN, Ferrara ; Ferrara U.) ; Mazzolari, Andrea (INFN, Ferrara ; Ferrara U.) ; Vincenzi, D (INFN, Ferrara ; Ferrara U.) ; Milan, R (INFN, Legnaro) et al.
Deflection due to axial channeling in a silicon crystal bent along the [111] axis was observed for 150 GeV/c negative particles, mainly π− mesons, at one of the secondary beams of the CERN SPS. The whole beam was deflected to one side with the efficiency of about 90% and with the peak position at the bend crystal angle α=43 μrad. [...]
2009
- Published in : Phys. Lett. B 680 (2009) 301-304
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5.
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High-Efficiency Deflection of High-Energy Protons through Axial Channeling in a Bent Crystal
/ Scandale, Walter (CERN) ; Vomiero, Alberto (INFM, Brescia) ; Baricordi, Stefano (INFN, Ferrara ; Ferrara U.) ; Dalpiaz, Pietro (INFN, Ferrara ; Ferrara U.) ; Fiorini, Massimiliano (INFN, Ferrara ; Ferrara U.) ; Guidi, Vincenzo (INFN, Ferrara ; Ferrara U.) ; Mazzolari, Andrea (INFN, Ferrara ; Ferrara U.) ; Della Mea, Gianantonio (INFN, Legnaro) ; Milan, Riccardo (INFN, Legnaro) ; Ambrosi, Giovanni (INFN, Perugia ; Perugia U.) et al.
Beam deflection due to axial channeling in a silicon crystal bent along the [111] axis was observed with 400 GeV/c protons at the CERN Super Proton Synchrotron. The condition for doughnut scattering of protons by the atomic strings of the crystal was attained. [...]
2008
- Published in : Phys. Rev. Lett. 101 (2008) 164801
APS Published version, local copy: PDF;
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6.
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Deflection of 400 GeV/c proton beam with bent silicon crystals at the CERN Super Proton Synchrotron
/ Scandale, Walter (CERN) ; Carnera, Alberto ; Della Mea, Gianantonio ; De Salvador, Davide ; Milan, Riccardo ; Vomiero, Alberto ; Baricordi, Stefano ; Dalpiaz, Pietro ; Fiorini, Massimiliano ; Guidi, Vincenzo et al.
This paper presents a detailed study of the deflection phenomena of a 400 GeV/c proton beam impinging on a new generation of bent silicon crystals; the tests have been performed at the CERN Super Proton Synchrotron H8 beam line. Channeling and volume reflection angles are measured with an extremely precise goniometer and with high resolution silicon microstrip detectors. [...]
2008
- Published in : Phys. Rev. Spec. Top. Accel. Beams 11 (2008) 063501
APS Published version, local copy: PDF;
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7.
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Double volume reflection of a proton beam by a sequence of two bent crystals
/ Scandale, Walter (CERN) ; Carnera, Alberto (INFN, Legnaro ; Padua U.) ; Della Mea, Gianantonio (INFN, Legnaro ; Trento U.) ; De Salvador, Davide (INFN, Legnaro ; Padua U.) ; Milan, Riccardo (INFN, Legnaro) ; Vomiero, Alberto (INFN, Legnaro ; INFM, Brescia) ; Baricordi, Stefano (INFN, Ferrara) ; Dalpiaz, Pietro (INFN, Ferrara) ; Fiorini, Massimiliano (INFN, Ferrara) ; Guidi, Vincenzo (INFN, Ferrara) et al.
The doubling of the angle of beam deflection due to volume reflection of protons by a sequence of two bent silicon crystals was experimentally observed at the 400 GeV proton beam of the CERN SPS. A similar sequence of short bent crystals can be used as an efficient primary collimator for the Large Hadron Collider..
2008
- Published in : Phys. Lett. B 658 (2008) 109-111
- Published in : Phys. Lett. B 660 (2008) 610-611 (Erratum)
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8.
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Efficiency of Finding Muon Track Trigger Primitives in CMS Cathode Strip Chambers
/ Acosta, Darin ; Adam, A ; Andreev, Valeri ; Apollinari, Giorgio ; Baek, Yong Wook ; Banicz, Karoly ; Barashko, Victor ; Barberis, Emanuela ; Bartalini, Paolo ; Bloch, Ingo et al.
In the CMS Experiment, muon detection in the forward direction is accomplished by cathode strip chambers~(CSC). These detectors identify muons, provide a fast muon trigger, and give a precise measurement of the muon trajectory. [...]
CMS-NOTE-2007-031.-
Geneva : CERN, 2007 - 14 p.
Fulltext: PDF;
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9.
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High-Efficiency Volume Reflection of an Ultrarelativistic Proton Beam with a Bent Silicon Crystal
/ Scandale, Walter (CERN) ; Still, Dean A ; Carnera, Alberto ; Della Mea, Gianantonio ; De Salvador, Davide ; Milan, Riccardo ; Vomiero, Alberto ; Baricordi, Stefano ; Dalpiaz, Pietro ; Fiorini, Massimiliano et al.
The volume reflection phenomenon was detected while investigating 400 GeV proton interactions with bent silicon crystals in the external beam H8 of the CERN Super Proton Synchrotron. Such a process was observed for a wide interval of crystal orientations relative to the beam axis, and its efficiency exceeds 95%, thereby surpassing any previously observed value. [...]
CARE-Pub-07-001; CARE-Pub-2007-001.-
CARE, 2007
- Published in : Phys. Rev. Lett. 98 (2007) 154801
APS Published version, local copy: PDF;
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