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BFPP losses and quench limit for LHC magnets
/ Bruce, R (CERN) ; Gilardoni, S S (CERN) ; Jowett, John M (CERN)
Summary The performance of the LHC as a heavy ion (or proton) collider is limited by a number of physical processes in which beam ions are lost in superconducting magnets, depositing heat that could induce a quench. Bound Free Pair Production BFPP) at the collision point is the most serious process for lead ion beams. [...]
LHC-Project-Note-379; CERN-LHC-Project-Note-379.-
2006 - 29 p.
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Beam Loss Monitors for Heavy Ion Operation
/ Bellodi, G (CERN) ; Braun, H H (CERN) ; Bruce, R (CERN) ; Gilardoni, S (CERN) ; Jowett, John M (CERN)
The performance of the LHC as a heavy-ion collider is expected to be limited by a variety of beam loss mechanisms that are non-existent, or substantially different, in the case of protons. Among these are ultra-peripheral interactions of the colliding beams and the collimation inefficiency. [...]
LHC-Project-note-402; CERN-LHC-Project-note-402.-
2007 - 15 p.
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Monitoring heavy-ion beam losses in the LHC
/ Bruce, R ; Bellodi, G ; Braun, H ; Gilardoni, S S (CERN) ; Jowett, John M
The LHC beam loss monitor (BLM) system, primarily designed for proton operation, will survey particle losses and dump the beam if the loss rate exceeds a threshold expected to induce magnet quenches. Simulations of beam losses in the full magnet geometry allow us to compare the response of the BLMs to ion and proton losses and establish preliminary loss thresholds for quenches. [...]
LHC-PROJECT-Report-921; CERN-LHC-Project-Report-921.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.544
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Measurement of Ion Beam Losses due to Bound-Free Pair Production in RHIC
/ Jowett, John M ; Bruce, R ; Drees, A ; Fischer, W ; Gilardoni, S S (CERN) ; Klein, S ; Tepikian, S
When the LHC operates as a Pb82+ ion collider, losses of Pb81+ ions, created through Bound-free Pair Production at the collision point, and localized in cold magnets, are expected to be a major luminosity limit. With Au79+ ions at RHIC, this effect is not a limitation because the Au78+ production rate is low, and the Au78+ beam produced is inside the momentum aperture. [...]
CERN-AB-2006-046.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.553
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Ion and proton loss paterns at the SPS and LHC
/ Bruce, R (CERN) ; Assman, R (CERN) ; Bellodi, G (CERN) ; Bracco, C (CERN) ; Braun, H H (CERN) ; Gilardoni, S (CERN) ; Jowett, John M (CERN) ; Redaelli, S (CERN) ; Weiler, T (CERN)
The collimation system of the LHC, primarily designed for proton operation, must function safely also with 208Pb82+ions. However, the particle-matter interaction in a collimator is different for heavy ions and protons. [...]
CERN, 2008
Published version: PDF;
In : CARE-HHH-APD Workshop on Finalizing the Roadmap for the Upgrade of the CERN and GSI Accelerator Complex, CERN, Geneva, Switzerland, 01 - 05 Oct 2007, pp.76-81 (CERN-2008-005)
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Beam Induced Quenches of LHC Magnets
/ Sapinski, M (CERN) ; Baer, T (CERN) ; Bednarek, M (CERN) ; Bellodi, G (CERN) ; Bracco, Ch (CERN) ; Bruce, R (CERN) ; Dehning, B (CERN) ; Hofle, W (CERN) ; Lechner, A (CERN) ; Nebot Del Busto, E (CERN) et al.
In the years 2009-2013 LHC has been operated with the top beam energies of 3.5 TeV and 4 TeV instead of the nominal 7 TeV, with corresponding reduced currents in the superconducting magnets. To date only a small number of beam-induced quenches have occurred, with most of them being specially designed quench tests. [...]
CERN-ATS-2013-049.-
Geneva : CERN, 2013 - 3 p.
Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.3243
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Luminosity Limit from Bound-Free Pair Production in the LHC
/ Jowett, John M ; Bruce, Roderik ; Gilardoni, S S
The luminosity of the LHC as a lead-ion collider is known to be limited by the large cross-sections for electromagnetic processes in ultra-peripheral collisions. In particular, the process of bound-free e-e+ pair production creates secondary beams of Pb81+ ions emerging from the collision points and impinging on the vacuum envelope inside superconducting magnets. New Monte-Carlo simulations, exploiting recent implementations of the physics of ion interactions with matter, are helping us to quantify the relationships among luminosity, energy deposition in the magnet coils a view to predicting and alleviating the quench limit on luminosity..
LHC-Project-Report-841; CERN-LHC-Project-Report-841.-
Geneva : CERN, 2005 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.1306
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Collimation quench test with 4 TeV proton beams
/ Salvachua, B ; Bruce, R ; Cauchi, M ; Deboy, D ; Hofle, W ; Holzer, EB ; Jacquet, D ; Lari, L ; Nebot, E ; Mirarchi, D et al.
In 2013, at the end of the LHC physics run I, several quench tests took place with the aim to measure the quench limit of the LHC superconducting magnets. [...]
CERN-ACC-NOTE-2014-0036.
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2014. - 16 p.
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