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1.
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Channeling performance of bent crystals developed at CERN
/ Rodin, Volodymyr (CERN) ; Esposito, Luigi Salvatore (CERN) ; Lechner, Anton (CERN) ; Demassieux, Quentin (CERN) ; Matheson, Eloise (CERN) ; Solis Paiva, Santiago (CERN) ; Seidenbinder, Regis (CERN) ; Aberle, Oliver (CERN) ; Perillo Marcone, Antonio (CERN) ; Calviani, Marco (CERN) et al.
Bent crystals are a mature technology used in several applications at CERN, such as the crystal-assisted collimation system for LHC ion operation and reduction of losses during the slow extraction from the SPS by shadowing the electrostatic septum. In the future, it is planned to measure electric and magnetic dipole moments of short-lived particles with a double-crystal experiment in the LHC. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) THPS39
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPS39
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Crystal Collimation of 20 MJ Heavy-Ion Beams at the HL-LHC
/ D'Andrea, Marco (CERN) ; Bruce, Roderik (CERN) ; Di Castro, Mario (CERN) ; Galluccio, Francesca (INFN, Naples) ; Lamas Garcia, Inigo (CERN) ; Masi, Alessandro (CERN) ; Mirarchi, Daniele (CERN) ; Nevay, Laurence (Royal Holloway, U. of London ; CERN) ; Redaelli, Stefano (CERN) ; Rossi, Roberto (CERN) et al.
The concept of crystal collimation at the Large Hadron Collider (LHC) relies on the use of bent crystals that can deflect halo particles by a much larger angle than the standard multi-stage collimation system. Following an extensive campaign of studies and performance validations, a number of crystal collimation tests with Pb ion beams were performed in 2018 at energies up to 6.37 Z TeV. [...]
2021 - 4 p.
- Published in : 10.18429/JACoW-IPAC2021-WEPAB023
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, Br, 24 - 28 May 2021, pp.2644-2647
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3.
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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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4.
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SPS slow extraction losses and activation: update on recent improvements
/ Fraser, Matthew (CERN) ; Balhan, Bruno (CERN) ; Barna, Daniel (Wigner RCP, Budapest) ; Bartosik, Hannes (CERN) ; Bernhard, Johannes (CERN) ; Bertone, Caterina (CERN) ; Björkman, Daniel (CERN) ; Borburgh, Jan (CERN) ; Brugger, Markus (CERN) ; Brunner, Kristóf (Wigner RCP, Budapest) et al.
Annual high intensity requests of over $1 \times 10^{19}$ protons on target (POT) from the CERN Super Proton Synchrotron (SPS) Fixed Target (FT) physics program continue, with the prospect of requests for even higher, unprecedented levels in the coming decade. A concerted and multifaceted R&D; effort has been launched to understand and reduce the slow extraction induced radioactivation of the SPS and to anticipate future experimental proposals, such as SHiP [1] at the SPS Beam Dump Facility (BDF) [2], which will request an additional $4 \times 10^{19}$ POT per year. [...]
CERN-PBC-CONF-2021-002; CERN-ACC-2019-199.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPMP031
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP031
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5.
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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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6.
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Septum shadowing by means of a bent crystal to reduce slow extraction beam loss
/ Velotti, Francesco Maria (CERN) ; Esposito, Luigi Salvatore (CERN) ; Fraser, Matthew Alexander (CERN) ; Kain, Verena (CERN) ; Gilardoni, Simone (CERN) ; Goddard, Brennan (CERN) ; Pari, Michelangelo (CERN) ; Prieto, Javier (CERN) ; Rossi, Roberto (CERN) ; Scandale, Walter (CERN) et al.
The flux of high-energy protons slow-extracted from the CERN Super Proton Synchrotron (SPS) is limited by the induced radioactivity caused by the beam loss intrinsic to the extraction process. Methods to substantially increase the efficiency of the extraction process are of great interest to fulfill requests for an increasing flux of 400 GeV protons to the present experiments, located in the North Area of the SPS, and also for potential future experiments with very high demanded protons on target. [...]
2019 - 15 p.
- Published in : Phys. Rev. Accel. Beams 22 (2019) 093502
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7.
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Crystal Collimation Tests with Pb Ion Beams
/ D'Andrea, Marco (Universita e INFN, Padova (IT)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Redaelli, Stefano (CERN) ; Fomin, Alex (NSC Kharkiv Institute of Physics and Technology (UA)) ; Belli, Eleonora (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Nevay, Laurence James (University of London (GB)) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Scandale, Walter (CERN) ; Montesano, Simone (Universita e INFN, Bologna (IT)) et al.
During MD4168, performed on November 27th 2018, silicon crystals for a crystal-assisted collimation system were tested. [...]
CERN-ACC-NOTE-2019-0024.
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2019.
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Operational Aspects of Crystal Collimation with Proton Beams
/ D'Andrea, Marco (Universita e INFN, Padova (IT)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Redaelli, Stefano (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Nevay, Laurence James (University of London (GB)) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Scandale, Walter (CERN) ; Montesano, Simone (Universita e INFN, Bologna (IT)) ; Galluccio, Francesca (Universita e sezione INFN di Napoli (IT)) ; Serrano Galvez, Pablo (Universidad de Oviedo (ES)) et al.
During MD4167, performed on September 12th 2018, silicon crystals for a crystal-assisted collimation system were tested, with particular focus on operational aspects such as evaluation of cleaning performances and deployment during dynamical phases of the machine. [...]
CERN-ACC-NOTE-2019-0023.
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2019.
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Crystal Collimation Tests with Proton Beams
/ D'Andrea, Marco (Universita e INFN, Padova (IT)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Redaelli, Stefano (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Nevay, Laurence James (University of London (GB)) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Scandale, Walter (CERN) ; Montesano, Simone (Universita e INFN, Bologna (IT)) ; Galluccio, Francesca (Universita e sezione INFN di Napoli (IT)) ; Serrano Galvez, Pablo (Universidad de Oviedo (ES)) et al.
During MD3327, performed in two steps on June 14th and July 27th 2018, silicon crystals for a crystal-assisted collimation system were tested, with particular focus on the newly installed crystal on the horizontal plane of Beam 2. [...]
CERN-ACC-NOTE-2019-0022.
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2019.
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Improvements to the SPS Slow Extraction for High Intensity Operation
/ Balhan, Bruno (CERN) ; Bestmann, Patrick (CERN) ; Bjorkman, Daniel (CERN) ; Borburgh, Jan (CERN) ; Butcher, Mark (CERN) ; Calviani, Marco (CERN) ; Di Castro, Mario (CERN) ; Donze, Mathieu (CERN) ; Esposito, Luigi Salvatore (CERN) ; Fraser, Matthew Alexander (CERN) et al.
Slow extraction using the third-integer resonance and thin electrostatic septa as used in the SPS to serve the North Area is a process with inherent beam loss. [...]
CERN-ACC-NOTE-2019-0010 ; CERN-PBC-Notes-2021-007.
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2019. - 87 p.
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