LHC Collimation Working Group 

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Recent publications of work connected to the LHC Collimation Working Group:


Journal Publications:

Reaching record-low β* at the CERN Large Hadron Collider using a novel scheme of collimator settings and optics, Nuclear Instruments and Methods in Physics Research A 848 (2017) 19-30, by: R. Bruce, C. Bracco, R. De Maria, M. Giovannozzi, A. Mereghetti, D. Mirarchi, S. Redaelli, E. Quaranta,b, B. Salvachua (PDF)

Measured and simulated heavy-ion beam loss patterns at the CERN Large Hadron Collider, Nuclear Instruments and Methods in Physics Research A 819 (2016) 73-83, by: P.D. Hermes, R. Bruce, J.M. Jowett, S. Redaelli, B. Salvachua Ferrando, G. Valentino, D. Wollmann (PDF

Calculations of safe collimator settings and Beta-star at the CERN Large Hadron Collider,
Phys. Rev. ST Accel. Beams, 18, 061001 (2015), by. R. Bruce, R. W. Assmann, and S. Redaelli (
PDF)

Thermomechanical response of Large Hadron Collider collimators to proton and ion beam impacts, Phys. Rev. ST Accel. Beams, 18, 041002 (2015), by. M. Cauchi, R. W. Assmann, A. Bertarelli, F. Carra, F. Cerutti, L. Lari, S. Redaelli, P. Mollicone, and N. Sammut (PDF)

Thermomechanical assessment of the effects of a jaw-beam angle during beam impact on Large Hadron Collider collimators, Phys. Rev. ST Accel. Beams, 18, 021001 (2015), by. M. Cauchi, R. W. Assmann, A. Bertarelli, F. Carra, L. Lari, A. Rossi, P. Mollicone, and N. Sammut (PDF)

Beam feasibility study of a collimator with in-jaw beam position monitors, Nucl. Instr. Meth. Phys. Res. A, Vol. 768, pp. 62-68 (2014), by. D. Wollmann, A. Nosych, G. Valentino, O. Aberle, R. W. Assmann, A. Bertarelli, C. Boccard, R. Bruce, F. Burkart, E. Calvo, M. Cauchi, A. Dallocchio, D. Deboy, M. Gasior, R. Jones, V. Kain, L. Lari, S. Redaelli, A. Rossi (PDF)

Simulations and measurements of beam loss patterns at the CERN Large Hadron Collider, Phys. Rev. ST Accel. Beams, 17, 081004 (2014), by: R. Bruce, R. W. Assmann, V. Boccone, C. Bracco, M. Brugger, M. Cauchi, F. Cerutti, D. Deboy, A. Ferrari, L. Lari, A. Marsili, A. Mereghetti, D. Mirarchi, E. Quaranta, S. Redaelli, G. Robert-Demolaize, A. Rossi, B. Salvachua, E. Skordis, C. Tambasco, G. Valentino, T. Weiler, V. Vlachoudis, D. Wollmann (PDF)

Successive approximation algorithm for beam-position-monitor-based LHC collimator alignment, Phys. Rev. ST Accel. Beams, 17, 021005 (2014), by: G. Valentino, A. A. Nosych, R. Bruce, M. Gasior, D. Mirarchi, S. Redaelli, B. Salvachua, D. Wollmann (PDF)

High energy beam impact tests on a LHC tertiary collimator at the CERN high-radiation to materials facility, Phys. Rev. ST Accel. Beams, 17, 021004 (2014), by: M. Cauchi, O. Aberle, R. Assmann, A. Bertarelli, F. Carra, K. Cornelis, A. Dallocchio, D. Deboy, L. Lari, S. Redaelli, A. Rossi, B. Salvachua, P. Mollicone, N. Sammut (PDF)

Simulator for beam-based LHC collimator alignment, Phys. Rev. ST Accel. Beams, 17, 021003 (2014), by: G. Valentino, R. Assmann, S. Redaelli, N. Sammut (PDF)

Sources of machine-induced background in the ATLAS and CMS detectors at the CERN Large Hadron Collider, Nuclear Instruments and Methods in Physics Research A 729 (2013) 825�840, by: R. Bruce, R.W. Assmann, V. Boccone, G. Bregliozzi, H. Burkhardt, F. Cerutti, A. Ferrari, M. Huhtinen, A. Lechner, Y. Levinsen, A. Mereghetti, N.V. Mokhov, I.S. Tropin, V. Vlachoudis (PDF)

Beam diffusion measurements using collimator scans in the LHC, Phys. Rev. ST Accel. Beams, 16, 021003 (2013), by: G. Valentino, R. Assmann, R. Bruce, F. Burkart, V. Previtali, S. Redaelli, B. Salvachua, G. Stancari, A. Valishev (PDF)

Semiautomatic beam-based LHC collimator alignment, Phys. Rev. ST Accel. Beams, 15, 051002 (2012), by: G. Valentino, R. Assmann, R. Bruce, S. Redaelli, A. Rossi, N. Sammut, D. Wollmann (PDF)

Beam losses from ultra-peripheral nuclear collisions between 208Pb82+ ions in the Large Hadron Collider and their alleviation, Phys. Rev. ST Accel. Beams, 12, 071002 (2009), by: R. Bruce, D. Bocian, S. Gilardoni, and J.M. Jowett (PDF)

Measurements of heavy ion beam losses from collimation, Phys. Rev. ST Accel. Beams, 12, 011001 (2009), by: R. Bruce, R. Assmann, G. Bellodi, C. Bracco, H. H. Braun, S. Gilardoni, E. B. Holzer, J. M. Jowett, S. Redaelli, T. Weiler (PDF)


Conference Publications:

IPAC 2015:

Beam cleaning in experimental IRs in HL-LHC for incoming beam by: H. Garcia Morales, R. Bruce, S. Redaelli (PDF)

Plans for deployment of hollow electron lenses at the LHC for enhanced beam collimation by: S. Redaelli, A. Bertarelli, R. Bruce, A. Danisi, D. Perini, A. Rossi, B. Salvachua, G. Stancari, A. Valishev (PDF)

Collimation cleaning at the LHC with advanced secondary collimator materials by: E. Quaranta, R. Bruce, A. Mereghetti, S. Redaelli, A. Rossi (PDF)

Comparison of beam sizes at the collimator locations from measured optics and beam-based collimator alignment at the LHC by: G. Valentino, R. Bruce, A. Langner, S. Redaelli, R. Tomas (PDF)

Updated simulation studies of damage limit of LHC tertiary collimators by: E. Quaranta, A. Bertarelli, R. Bruce, F. Carra, F. Cerutti, P. Gradassi, A. Lechner, S. Redaelli, E. Skordis (PDF)

Betatron cleaning for heavy ion beams with IR7 dispersion suppressor collimators by: P. Hermes, R. Bruce, J.M. Jowett, S. Redaelli (PDF)

Collimator layouts for HL-LHC in the experimental insertions by: R. Bruce, F. Cerutti, L.S. Esposito, H. Garcia Morales, J.M. Jowett, R. Kwee-Hinzmann, A. Lechner, E. Quaranta, S. Redaelli, M. Schaumann, E. Skordis, G.E. Steele (PDF)

Impact of beam losses in the LHC collimation regions by: E. Skordis, R. Bruce, F. Cerutti, A. Ferrari, P.D. Hermes, A. Lechner, A. Mereghetti, P.G. Ortega, S. Redaelli, V. Vlachoudis (PDF)

Simulation of hollow electron lenses as LHC beam halo reducers using Merlin by: H. Rafique, R. Appleby, R.J. Barlow, R. Bruce, S. Redaelli, S.C. Tygier (PDF)

Beam Induced Background Simulation Studies at IR1 with New High Luminosity LHC Layout by: R. Kwee-Hinzmann, S. M. Gibson, R. Bruce, F. Cerutti, L.S. Esposito, A. Lechner (PDF)

IPAC 2014:

Collimation cleaning for HL-LHC optics scenarios with error models by: A. Marsili, R. Bruce, S. Redaelli (PDF)

Multi-turn tracking of collisions products at the LHC by: A. Marsili, R. Bruce, F. Cerutti, L. S. Esposito, S. Redaelli (PDF)

Power deposition in LHC magnets with and without dispersion suppressor collimators downstream of the betatron cleaning insertion by: A. Lechner, B. Auchmann, R. Bruce, F. Cerutti, P. P. Granieri, A. Marsili, S. Redaelli, N. V. Shetty, E. Skordis, G. E. Steele, A. P. Verweij (PDF)

Collimator fast failure losses for various HL-LHC configurations by: L. Lari, R. Bruce, S. Redaelli (PDF)

Construction and bench testing of a prototype rotatable collimator for the LHC by: T. W. Markiewicz, E. L. Bong, L. Keller, O. Aberle, A. Bertarelli, P. Gradassi, A. Marsili, S. Redaelli, A. Rossi, B. Salvachua, G. Valentino (PDF)

Comparison of MERLIN/SixTrack for LHC collimation studies by: M. Serluca, R. Appleby, J. Molson, R. J. Barlow, H. Rafique, A. Toader, R. Bruce, A. Marsili, S. Redaelli, B. Salvachua, C. Tambasco (PDF)

Mechanical engineering and design of novel collimators for HL-LHC by: F. Carra, A. Bertarelli, A. Dallocchio, L. Gentini, P. Gradassi, A. Manousos, N. Mariani, G. Maitrejean, N. Mounet, E. Quaranta, S. Redaelli, V. Vlachoudis (PDF)

Final layout and expected cleaning for the first crystal-assisted collimation test at the LHC by: D. Mirarchi, S. Montesano, S. Redaelli, W. Scandale, F. Galluccio, A. Taratin (PDF)

Improvements of the crystal routine for collimation studies by: D. Mirarchi, S. Redaelli, W. Scandale, A. Taratin, I. Yazynin (PDF)

Electron lenses for the Large Hadron Collider by: G. Stancari, A. Valishev, R. Bruce, S. Redaelli, A. Rossi, B. Salvachua (PDF)

Integrated simulation tools for collimation cleaning in HL-LHC by: R. Bruce, C. Bracco, F. Cerutti, A. Ferrari, A. Lechner, A. Marsili, A. Mereghetti, D. Mirarchi, P. G. Ortega, D. Pastor Sinuela, S. Redaelli, A. Rossi, B. Salvachua, V. Vlachoudis, R. Appleby, J. Molson, M. Serluca, R. Assmann, R. J. Barlow, H. Rafique, A. Toader, S. Gibson, L. Nevay, L. Lari, C. Tambasco (PDF)

Cleaning performance with 11T dipoles and local dispersion suppressor collimation at the LHC by: R. Bruce, A. Marsili, S. Redaelli (PDF)

Handling 1 MW losses with the LHC collimation system by: B. Salvachua, R. Bruce, F. Carra, M. Cauchi, E. B. Holzer, W. Hofle, D. Jacquet, L. Lari, D. Mirarchi, E. Nebot del Busto, S. Redaelli, A. Rossi, M. Sapinski, R. Schmidt, G. Valentino, D. Valuch, J. Wenninger, D. Wollmann, M. Zerlauth (PDF)

First beam background simulation studies at IR1 for high luminosity LHC by: R. Kwee-Hinzmann, S.M. Gibson, John Adams Institute at Royal Holloway, G. Bregliozzi, R. Bruce, F. Cerutti, L.S. Esposito, R. Kersevan, A. Lechner, N.V. Shetty  (PDF)

IPAC 2013:

Analysis of failures of the LHC collimators during the 2010-2013 operation by: S. Redaelli, A. Masi (PDF)

Simulations of collimation cleaning performance with HL-LHC optics by: A. Marsili, R. Bruce, R. de Maria, S. Fartoukh, S. Redaelli (PDF)

Experience with high-intensity beam scraping and tail population at the Large Hadron Collider by: S. Redaelli, R. Assmann, F. Burkart, R. Bruce, D. Mirarchi, B. Salvachua, G. Valentino, D. Wollmann (PDF)

Lifetime analysis at high intensity colliders applied to the LHC by: B. Salvachua, R. Assmann, R. Bruce, F. Burkart, S. Redaelli, G. Valentino, D. Wollmann (PDF)

First results of an experiment on advanced collimator materials at CERN HiRadMat facility by: A. Bertarelli, O. Aberle, R. Assmann, E. Berthome, V. Boccone, M. Calderon Cueva, F. Carra, F. Cerutti, N. Charitonidis, C. Charrondiere, A. Dallocchio, M. Donze, P. Francon, M. Garlasche, L. Gentini, M. Guinchard, N. Mariani, A. Masi, P. Moyret, L. Peroni, S. Redaelli, A. Rossi, M. Scapin (PDF)

Simulations and measurements of cleaning with 100 MJ beams in the LHC by: R. Bruce, R. Assmann, V. Boccone, C. Bracco, M. Cauchi, F. Cerutti, D. Deboy, A. Ferrari, L. Lari, A. Marsili, A. Mereghetti, E. Quaranta, S. Redaelli, G. Robert-Demolaize, A. Rossi, B. Salvachua, E. Skordis, G. Valentino, T. Weiler, V. Vlachoudis, D. Wollmann (PDF)

High energy beam impact tests on a LHC tertiary collimator at CERN HiRadMat facility by: M. Cauchi, O. Aberle, R. Assmann, A. Bertarelli, F. Carra, A. Dallocchio, D. Deboy, L. Lari, P. Mollicone, S. Redaelli, A. Rossi, B. Salvachua, N. Sammut (PDF)

Remote estimation of collimator jaw damages with sound measurements during beam impacts by: D. Deboy, R. Assmann, O. Aberle, F. Carra, M. Cauchi, J. Lendaro, A. Masi, S. Redaelli (PDF)

Layouts for crystal collimation tests at the LHC by: D. Mirarchi, V. Previtali, S. Redaelli, W. Scandale (PDF)

Simulations and measurements of physics debris losses at the 4 TeV LHC by: A. Marsili, R. Bruce, F. Cerutti, S. Redaelli (PDF)

Collimator impedance measurements in the LHC by: N. Mounet, R. Bruce, E. Metral, S. Redaelli, B. Salvachua, B. Salvant, G. Valentino (PDF)

Sixtrack simulation of off-momentum cleaning in LHC by: E. Quaranta, R. Bruce, S. Redaelli (PDF)

Cleaning inefficiency of the LHC collimation system during the energy ramp: simulations and measurements by: E. Quaranta, R. Bruce, L. Lari, D. Mirarchi, S. Redaelli, A. Rossi, B. Salvachua, G. Valentino (PDF)

Comparison of LHC beam loss maps using the transverse damper blow up and tune resonance crossing methods by: V. Moens, R. Bruce, S. Redaelli, B. Salvachua, G. Valentino (PDF)

Simulations and measurements of beam losses on LHC collimators during beam abort losses by: L. Lari, C. Bracco, R. Bruce, A. Faus-Golfe, B. Goddard, S. Redaelli, B. Salvachua, G. Valentino (PDF)

Development and beam tests of an automatic algorithm for alignment of LHC collimators with embedded BPMs by: G. Valentino, R. Assmann, R. Bruce, M. Gasior, D. Mirarchi, A. Nosych, S. Redaelli, B. Salvachua, N. Sammut (PDF)

ICFA-HB 2012:

A tool based on the BPM-interpolated orbit for speeding up LHC collimator alignment by: G. Valentino, R. Assmann, R. Bruce. G. J. Mueller, S. Redaelli, B. Salvachua, N. Sammut (PDF)

Experimental verification for a collimator with in-jaw beam position monitors by: D. Wollmann et al. (PDF)

Quench tests at the Large Hadron Collider with Collimation Losses at 3.5 Z TeV by: S. Redaelli et al. (PDF)

ICAP 2012:

Automatic computer algorithms for beam-based setup of the LHC collimators by: G. Valentino, R. Assmann, R. Bruce, S. Redaelli, B. Salvachua, N. Sammut, D. Wollmann (PDF)

IPAC 2012:

Comparison of LHC Collimator Beam-Based Alignment Centers to BPM-Interpolated Centers by: G. Valentino, R. Assmann, R. Bruce, L. Lari, G. J. Mueller, S. Redaelli A. Rossi, N. Sammut, D. Wollmann (PDF)

Modeling and Simulation of LHC Beam-Based Collimator Setup by: G. Valentino, R. Assmann, F. Burkart, L. Lari, S. Redaelli, A. Rossi, N. Sammut, D. Wollmann (PDF)

Aperture Measurements in the LHC Interaction Regions by: S. Redaelli, C. Alabau Pons, R. Assmann, R. Bruce, M. Giovannozzi, G. J. Mueller, M. Pojer, J. Wenninger (PDF)

Studies for an Alternative LHC non-linear collimation system by: L. Lari, R. Assmann, V. Boccone, F. Cerutti, A. Faus-Golfe, A. Mereghetti, J. Resta-Lopez, R. Versaci, V. Vlachoudis (PDF)

Accelerator physics studies on the effects from an asynchronous beam dump onto the LHC experimental region collimators by: L. Lari, R. Assmann, V. Boccone, R. Bruce, F. Cerutti, A. Faus-Golfe, A. Mereghetti, A. Rossi, R. Versaci, V. Vlachoudis (PDF)

Improved robustness of the LHC collimation system by operating with a jaw-beam angle by: L. Lari, R. Assmann, M. Cauchi, A. Faus-Golfe, A. Rossi (PDF)

Preliminary thermo-mechanical analysis of angular beam impact on LHC collimators by: M. Cauchi, R. Assmann, A. Bertarelli, F. Carra, A. Dallocchio, D. Deboy, N. Mariani, P. Mollicone, A. Rossi, N. Sammut (PDF)

IPAC 2011:

Comparison of LHC Collimation Setups with Manual and Semi-automatic Collimator Alignments by: G. Valentino, R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deoby, S. Redaelli, N. Sammut, D. Wollmann (PDF)

Semi-automatic beam-based alignment algorithm for the LHC collimation system by: G. Valentino, R. Assmann, S. Redaelli, N. Sammut, D. Wollmann (PDF)

Collimation dependent beam lifetime and loss rates in the LHC by: D. Wollmann, R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, S. Redaelli, A. Rossi, G. Valentino (PDF)

First ion collimation commissioning results at the LHC by: G. Bellodi, R. Assmann, R. Bruce, M. Cauchi, J. M. Jowett, G. Valentino, D. Wollmann (PDF)

Halo scrapings with collimators in the LHC by: F. Burkart, R. Assmann, R. Bruce, M. Cauchi, D. Deboy, S. Redaelli, A. Rossi, G. Valentino, D. Wollmann (PDF)

First beam results for a collimator with in-jaw beam position monitors by: D. Wollmann et al. (PDF)

Evaluation of the combined betatron and momentum cleaning in point 3 in terms of cleaning efficiency and energy deposition for the LHC collimation upgrade by: L. Lari et al. (PDF)

Acoustic measurements in the collimation region of the LHC by: D. Deboy et al. (PDF)

LHC Collimation with a reduced beam pipe radius in ATLAS by: R. Bruce, R. Assmann (PDF)

Principles for generation of time-dependent collimator settings during the LHC cycle by: R. Bruce, R. Assmann, S. Redaelli (PDF)

Upgrade studies for the LHC collimators by: A. Rossi, R. Assmann, D. Wollmann (PDF)

Calculation method for safe beta-star in the LHC by: R. Bruce, R. Assmann, W. Herr, D. Wollmann (PDF)

Aperture determination in the LHC based on an emittance blow-up technique with collimator position scan by: R. Assmann et al. (PDF)

Preliminary assessment of beam impact consequences on LHC collimators by: M. Cauchi et al. (PDF)

Research and development of novel advanced materials for next-generation collimators by: A. Bertarelli, G. Arnau Izquierdo, F. Carra, A. Dallocchio, M. Gil Costa, N. Mariani (PDF)

LHC collimators with embedded beam position monitors: a new advanced mechanical design by: A. Dallocchio, A. Bertarelli, C. Boccard, F. Carra, M. Gasior, L. Gentini, M. A. Timmins (PDF)

ICFA-HB 2010:

Collimation for the LHC High Intensity Beams by: R. Assmann et al. (PDF)

Predicted performance of combined cleaning with DS-collimators in the LHC by: D. Wollmann, A. Rossi, R. Assmann, R. Bruce, S. Redaelli (PDF)

Leakage from LHC dump protection system by: C. Bracco et al. (PDF)

Operational performance of the LHC Collimation by: S. Redaelli, R. Assmann, R. Bruce, A. Rossi, D. Wollmann (PDF)

IPAC 2010:

First cleaning with LHC collimators by: D. Wollmann et al. (PDF)

PAC 2009:

Chromatic LHC optics effects on collimation phase space cuts by: C. Bracco, R. Assmann (PDF)

Propects for Integrating a Hollow Electron Lens into the LHC Collimation System by: J. C. Smith, R. Assmann, V. Previtali, V. Shiltsev, A. Valishev (PDF)

Final Implementation and Performance of the LHC Collimator Control System by: S. Redaelli, R. Assmann, R. Losito, A. Masi (PDF)

Operational Experience with LHC Collimation by: R. Assmann (PDF)

LHC Cleaning Efficiency with Imperfections by: C. Bracco, R. Assmann, S. Redaelli, T. Weiler (PDF)

Beam Commissioning Plan for LHC Collimation by: C. Bracco, R. Assmann, S. Redaelli, T. Weiler (PDF)

Energy Deposition Studies for Possible Innovative Phase II Collimator Designs by: L. Lari, R. Assmann, M. Brugger, F. Cerutti, A. Ferrari, L. Lari, T. Wiler, V. Vlachoudis (PDF)

Operational Experience with a LHC Collimator Prototype in the CERN SPS by: S. Redaelli et al. (PDF)

Accelerator Physics Concept for Upgraded LHC Collimation Performance by: R. Assmann et al. (PDF)

Studies on combined momentum and betatron cleaning in the LHC by: R. Assmann, G. Bellodi, C. Bracco, V. Previtali, S. Redaelli, T. Weiler (PDF)

EPAC 2008:

Preliminary exploratory study of different phase II collimators by: L. Lari et al. (PDF)

Evaluation of beam losses and energy depositions for a possible phase II design for LHC collimation by: L. Lari et al. (PDF)

Measurements of heavy ion beam losses from collimation by: R. Bruce, R. Assmann, G. Bellodi, C. Bracco, H. H. Braun, S. Gilardoni, E. B. Holzer, J. M. Jowett, S. Redaelli, T. Weiler, C. Zamantzas (PDF)

Collimator Integration and Installation - example of one object to be installed in the LHC by: O. Aberle et al. (PDF)

PAC 2007:

Performance Reach of the Phase 1 LHC Collimation System by: G. Robert-Demolaize, R. Assmann, C. Bracco, S. Redaelli, T. Weiler (PDF)

Transverse Impedance of LHC Collimators by: E. Metral et al. (PDF)

The LHC Collimator Controls Architecture - Design and Beam Tests by: S. Redaelli, R. Assmann, P. Gander, M. Jonker, M. Lamont, R. Losito, A. Masi, M. Sobczak (PDF)

Scenarios for Beam Commissioning of the LHC Collimation System by: C. Bracco, R. Assmann, S. Redaelli, G. Robert-Demolaize (PDF)

LHC Collimation System Hardware Commissioning by: T. Weiler, O. Aberle, R. Assmann, R. Chamizo, Y. Kadi, J. Lettry, R. Losito, S. Redaelli (PDF)

Beam loss response measurements with a LHC prototype collimator in the SPS by: T. Weiler et al. (PDF)

EPAC 2006:

The final collimation system for the LHC by: R. Assmann et al. (PDF)

Permanent deformation of the LHC collimator jaws induced by shock beam impact: an analytical and numerical interpretation by: A. Bertarelli et al. (PDF)

Critical Halo Loss Locations in the LHC by: G. Robert-Demolaize, R. Assmann, C. Bracco, S. Redaelli, T. Weiler (PDF)

An alternative nonlinear collimation system for the LHC by: J. Resta-Lopez, R. Assmann, A. Faus-Golfe, S. Redaelli, G. Robert-Demolaize, D. Schulte, F. Zimmermann (PDF)

Collimation efficiency during commissioning by: C. Bracco, R. Assmann, A. Ferrari, S. Redaelli, G. Robert-Demolaize, M. Santana-Leitner, V. Vlachoudis, T. Weiler (PDF)

PAC 2005:

LHC Collimation: Design and Results from Prototyping and Beam Tests by: R. Assmann et al. (PDF)

Detecting Impacts of Proton Beams on the LHC Collimators with Vibration and Sound Measurements by: S. Redaelli, O. Aberle, R. Assmann, A. Masi, G. Spiezia (PDF)

Exploring a nonlinear collimation system for the LHC by: J. Resta, R. Assmann, A. Faus-Golfe, S. Redaelli, G. Robert-Demolaize, D. Schulte, F. Zimmermann (PDF)

Calculation of residual dose rates and intervention scenarios for the LHC beam cleaning insertions - constraints and optimization by: O. Aberle, R. Assmann, M. Brugger, D. Forkel-With, H. G. Menzel, S. Roesler, H. Vincke (PDF)

Energy deposition studies for the betatron cleaning insertion (IR7) of LHC by: M. Santana-Leitner, R. Assmann, A. Ferrari, M. Magistris, E. Tsoulou, V. Vlachoudis (PDF)

Mechanical Design for Robustness of the LHC Collimators by: A. Bertarelli et al. (PDF)

A new version of SixTrack with collimation and aperture interface by: G. Robert-Demolaize, R. Assmann, S. Redaelli, F. Schmidt (PDF)

EPAC 2004:

An improved collimation system for the LHC by: R. Assmann et al. (PDF)

The new layout of the LHC cleaning insertions by: R. Assmann et al. (PDF)

Collimation of heavy ion beams in the LHC by: H. H. Braun, R. Assmann, A. Ferrari, J. B. Jeanneret, J. M. Jowett, I. A. Pshenichnov (PDF)

Expected performance and beam-based optimization of the LHC collimation system by: R. Assmann, E. B. Holzer, J. B. Jeanneret, V. Kain, S. Redaelli, G. Robert-Demolaize, J. Wenninger (PDF)

The mechanical design for the LHC collimators by: A. Bertarelli, O. Aberle, R. Assmann, E. Chiaveri, T. Kurtyka, M. Mayer, R. Perret, P. Sievers (PDF)

PAC 2003:

Designing and Building a Collimation System for the High-Intensity LHC Beam by: R. Assmann et al (PDF)

Tools for Predicting Cleaning Efficiency in the LHC by: R. Assmann, I. Baichev, M. Brugger, M. Hayes, J.B. Jeanneret, D. Kaltchev, F. Schmidt (PDF)

EPAC 2002:

Requirements for the LHC Collimation System by: R. Assmann et al. (PDF)

Efficiency for the Imperfect LHC Collimation System by: R. Assmann, J.B. Jeanneret, D. Kaltchev (PDF).

Equipment Failure and Beam Losses in the LHC by: V. Kain, R. Assmann, R. Schmidt (PDF)

Equilibrium Beam Distribution and Halo in the LHC by: R. Assmann, F. Schmidt, F. Zimmermann (PDF).

Beam Loss Detection System of the LHC Ring by: E. Gschwendtner, A. Arauzo Garcia, B. Dehning, G. Ferioli, W. Friesenbichler (PDF)

The Influence of Time-Dependent Magnetic Field Errors on the Specifications of Feedback and Collimation Systems by: M. Hayes, R. Assmann, S. Fartoukh, J. Wenninger (PDF)

ICFA-HB 2002:

Beam Loss and Collimation at LHC by: I.L. Ajguirei, R. Assmann, I.S. Baichev, J.B. Jeanneret, D. Kaltchev, T. Kurtyka and A. Wroblewski (PDF)

APAC 2001:

Status of Robustness Studies for the LHC Collimation by: R. Assmann et al. (PDF)


LHC MD ATS Notes:

2015:

Collimation quench test with 6.5 TeV proton beams by: B. Salvachua, A. Mereghetti, B. Auchmann, R. Bruce, P. Hermes, E. B. Holzer, D. Jacquet, M. Kalliokoski, D. Mirarchi, S. Redaelli, E. Skordis, G. Valentino, A. Valloni, D. Valuch, D. Wollmann (PDF)

Off-momentum loss maps with one beam by: H. Garcia, R. Bruce, B. Salvachua (PDF)

Beta-star reach - IR7 collimation hierarchy limit and impedance by: A. Mereghetti, N. Biancacci, R. Bruce, L. R. Carver, R. Kwee, E. Metral, D. Mirarchi, E. Quaranta, S. Redaelli, A. Rossi, R. Rossi, B. Salvachua, B. Salvant, G. Valentino, A. Valloni (PDF)

IR aperture measurement at Beta-star = 40 cm by: R. Bruce, H. Garcia, P. Hermes, R. Kwee, A. Mereghetti, D. Mirarchi, S. Redaelli, B. Salvachua, P. Skrownowski, G. Valentino, A. Valloni (PDF)

Collimation with tighter TCTs at Beta-star = 40 cm by: R. Bruce, H. Garcia, P. Hermes, R. Kwee, A. Mereghetti, D. Mirarchi, E. Quaranta, S. Redaelli, B. Salvachua, G. Valentino, A. Valloni (PDF)

Characterization of Embedded BPM Collimators by: G. Valentino, G. Baud, R. Bruce, H. Garcia, P. Hermes, M. Gasior, R. Kwee, D. Mirarchi, J. Olexa, S. Redaelli, R. Rossi, B. Salvachua, A. Valloni, J. Wagner (PDF)

2013:

Scans of the physics debris absorbers (TCL) at the 4 TeV LHC by: A. Marsili, R. Bruce, E. Quaranta, S. Redaelli, B. Salvachua, G. Valentino (PDF)

Collimation quench test with 4 TeV proton beams by: B. Salvachua, R. Bruce, M. Cauchi, D. Deboy, W. Hofle, E. B. Holzer, D. Jacquet, L. Lari, E. Nebot, D. Mirarchi, E. Quaranta, S. Redaelli, M. Sapinski, R. Schmidt, G. Valentino, D. Valuch, J. Wenninger, D. Wollmann, M. Zerlauth (PDF)

IR2 aperture measurements at 4 TeV by: R. Bruce, M. Giovannozzi, P. D. Hermes, S. Redaelli, J. Wenninger (PDF)

2012:

Emittance blow-up and loss maps in the LHC using the transverse damper as exciter by: W. Hofle, D. Valuch, R. Assmann, S. Redaelli, R. Schmidt, D. Wollmann, M. Zerlauth (PDF)

Study on off-momentum tail scraping in the LHC by: D. Mirarchi, S. Redaelli, R. Bruce (PDF)

IR8 aperture measurements at injection energy by: R. Bruce, M. Giovannozzi, P. D. Hermes, A. A. Nosych, S. Redaelli, J. Wenninger (PDF)

Results on nominal collimator settings MD at 4 TeV by: B. Salvachua, R. Assmann, A. Burov, R. Bruce, M. Cauchi, D. Deboy, L. Lari, A. Marsili, E. Metral, N. Mounet, S. Redaell, B. Salvant, G. Valentino, V. Previtali (PDF)

Halo scraping, diffusion and repopulation by: G. Valentino, R. Assmann, R. Bruce, F. Burkart, V. Previtali, S. Redaelli, B. Salvachua, G. Stancari, A. Valishev (PDF)

Beam-based collimator alignment MD by: G. Valentino, R. Assmann, R. Bruce, G. J. Mueller, S. Redaelli, B. Salvachua (PDF)

IR2 aperture measurements at 3.5 TeV by: C. Alabau Pons et al. (PDF)

2011:

Pb ions collimator losses in IR7 DS and quench test at 3.5 ZTeV by: G. Bellodi, R. Assmann, R. Bruce, B. Dehning, E. B. Holzer, J. Jowett, E. Nebot del Busto, L. Ponce, S. Redaelli, M. Sapinski, M. Schaumann, M. Solfaroli Camillocci, G. Valentino, D. Valuch, R. Versteegen, J. Wenninger, D. Wollmann, M. Zerlauth (PDF)

Tests of tight collimator settings in the LHC by: R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, L. Lari, S. Redaelli, A. Rossi, B. Salvachua, G. Valentino, D. Wollmann (PDF)

Tight collimator settings with B* = 1.0 m by: R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, L. Lari, S. Redaelli, A. Rossi, B. Salvachua, G. Valentino, D. Wollmann (PDF)

Improving LHC Collimator Setup Efficiency at 3.5 TeV by: R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, L. Lari, S. Redaelli, A. Rossi, G. Valentino, D. Wollmann (PDF)

IR3 collimation combined betatron and momentum cleaning test at 3.5 TeV by: R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, L. Lari, S. Redaelli, A. Rossi, G. Valentino, D. Wollmann (PDF)

Beam distribution measurements in the LHC by: R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, L. Lari, S. Redaelli, A. Rossi, G. Valentino, D. Wollmann (PDF)

Summary of MD on nominal collimator settings by: R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, L. Lari, E. Metral, N. Mounet, S. Redaelli, A. Rossi, B. Salvant, G. Valentino, D. Wollmann (PDF)

Collimator losses in the DS of IR7 and quench test at 3.5 TeV by: R. Assmann et al. (PDF)

End-of-fill study on collimator tight settings by: R. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, S. Redaelli, A. Rossi, R. Schmidt, G. Valentino, D. Wollmann. (PDF)

IR1 and IR5 aperture at 3.5 TeV by: C. Alabau Pons, R. Assmann, R. Bruce, M. Giovannozzi, E. MacLean, G. Muller, S. Redaelli, F. Schmidt, R. Tomas, J. Wenninger (PDF)


Collimation Chapter in the LHC design report (PDF, 1.6 MB)


LHC Project Notes:

LHC-PROJECT-NOTE-293 . The Consequences of Abnormal Beam Dump Actions on the LHC Collimation System by: R. Assmann, B. Goddard, E. Vossenberg, E. Weisse; (2002). (PDF)

LHC-PROJECT-NOTE-282 . Summary of the CERN Meeting on Absorbers and Collimators for the LHC by: Assmann, R ; Fischer, C ; Jeanneret, J B ; Schmidt, R ; (2002). (PDF)

LHC-PROJECT-NOTE-277 . Preliminary Beam-based specifications for the LHC collimators by: Assmann, R et al; (2002). (PDF)

Chamonix Workshop:

2012:

Collimator settings and performance in 2011 and 2012 by: R. Bruce, R. Assmann, F. Burkart, M. Cauchi, D. Deboy, L. Lari, S. Redaelli, A. Rossi, B. Salvachua, G. Valentino, D. Wollmann (PDF)

Do we really need a collimator upgrade? by: S. Redaelli et al. (PDF)

2011:

LHC Collimation - too good or too bad? by: R. Assmann, D. Wollmann (PDF)

Collimator improvements 2011 and upgrade 2012: what do we plan? by: S. Redaelli et al. (PDF)

2010:

Summary of the collimation upgrade plans by: R. Assmann (PDF)

2003:

How Can We Lose the Beam? Beam Loss Scenarios and Strategies for the Design of Protection Systems by: R. Schmidt (PDF)

Apertures During Beam Abort by: B. Goddard (PDF)

Collimators and Cleaning, Could this Limit the LHC Performance? by: R. Assmann (PDF)

Appropriate Materials for LHC Collimators by: P. Sievers (PDF)

Orbit Control for Machine Operation and Protection by: J. Wenninger (PDF)

Abort Gap Cleaning and RF System by: E. Shaposhnikova (PDF)

2001:

Mechanisms for beam losses and their time constants by: O. Bruening (PDF)

Collimation schemes/Injection protection devices by: J. B. Jeanneret (PDF)


LHC Beam Operation Workshop (Evian):

2014:

Collimation system post-LS1: status and commissioning by: B. Salvachua, G. Valentino, O. Aberle, J. Albertone, S. Athanasiadis, V. Baglin, A. Bertarelli, C. Boccard, R. Bruce, F. Carra, G. Cattenoz, J. Coupard, S. Chemli, C. Derrez, L. Esposito, R. Folch, I. Lamas, J. Lendaro, R. Losito, A. Marsili, A. Masi, D. Mirarchi, E. Quaranta, S. Redaelli, A. Rossi, I. Sexton (PDF)

2012:

LHC collimation cleaning and operation outlook by: B. Salvachua, R. Assmann, R. Bruce, M. Cauchi, D. Deboy, L. Lari, A. Marsili, D. Mirarchi, E. Quaranta, S. Redaelli, G. Valentino (PDF)

2011:

LHC beta-star reach in 2012 by: R. Bruce, R. Assmann (PDF)

Multi-turn losses and cleaning in 2011 and 2012 by: G. Valentino, R. Assmann, G. Bellodi, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, J. M. Jowett, L. Lari, S. Redaelli, A. Rossi, B. Salvachua, D. Wollmann (PDF)

2010:

Collimators and beam cleaning: first results and future plans by: C. Bracco, R. Assmann, S. Redaelli, A. Rossi, D. Wollmann (PDF)

Multi-turn losses and cleaning by: D. Wollmann, R. Assmann, G. Bellodi, R. Bruce, M. Cauchi, J. M. Jowett, S. Redaelli, A. Rossi, G. Valentino (PDF)


Theses:

Ph.D. Theses:

Crystal collimation for LHC by: D. Mirarchi, 2015 (PDF)

Fast Automatic Beam-Based Alignment of the LHC Collimator Jaws by: G. Valentino, 2013 (PDF)

Beam-Machine Interaction Studies for the Phase II LHC Collimation System by: L. Lari, 2010 (PDF)

Performance Evaluation of a Crystal-Enhanced Collimation System for the LHC by: V. Previtali, 2010 (PDF)

Commissioning Scenarios and Tests for the LHC Collimation System by: C. Bracco, 2009 (PDF)

Design and Performance Optimization of the LHC Collimation System by: G. Robert-Demolaize, 2006 (PDF)

Masters Theses:

An improved scattering routine for collimation studies at LHC by: C. Tambasco, 2014 (PDF)

Experimental and numerical studies on the proposed application of hollow electron beam collimation for the LHC at CERN by: V. Moens, 2013 (PDF)

Off-momentum Collimation and Cleaning in the Energy Ramp in the LHC by: E. Quaranta, 2013 (PDF)

Beam loss and Beam Shape at the LHC Collimators by: F. Burkart, 2012 (PDF)

Acquisition System for detecting impacts of high energy proton beams on the LHC collimator by: G. Spiezia, 2004 (PDF)


Other papers (CERN and outside CERN) 
for general reference purposes

LHC Beam Dump:

AUTODYN study of the structural behaviour of the main LHC absorber block in the case of a total beam dilution failure

LHC Design Study:

Chapter 9: "Protection Against Beam Losses"

Stress and heating papers:

P. Sievers: "Elastic Stress Waves in Matter Due to Rapid Heating by an Intense High-Energy Particle Beam". LAB. II/BT/74-2.

Design of collimation systems:

P. Bryant: "The Design of Betatron and Momentum Collimation Systems". CERN SL/92-40 (AP)
J.B. Jeanneret et al: "PROTON COLLIMATION IN TEV COLLIDERS". LHC-Project-Report-156.

Fermilab papers:

A. Drozhdin et al: "BEAM LOSS AND COLLIMATION IN THE FERMILAB 16 GEV PROTON DRIVER". FERMILAB-Conf-01/128. 2001.
A. Drozhdin et al: "BEAM LOSS, RESIDUAL RADIATION, AND COLLIMATION AND SHIELDING IN THE FERMILAB BOOSTER". FERMILAB-Conf-01/141. 2001.
N. Mokhov et al: "TEVATRON RUN-II BEAM COLLIMATION SYSTEM". PAC99.
M. Kuchnir and J.R. Heim: "Stress Heating of a Thermally Insulated Superconductor". TM-706. 1977.
Z. Tang and K. Anderson: "Shock Waves in P-bar Target". Fermilab-TM-1763. 1991.

Other approaches:

A.G. Afonin et al: "High-Efficiency Beam Extraction and Collimation Using Channeling in Very Short Bent Crystals". PRL Vol. 87, Number 9.

SSC papers:

A. Drohzdin et al: "Toward Design of the Collider Beam Collimation System". SSCL-Preprint-555.
A. Drohzdin et al: "HEB Beam Collimation System". SSCL-662.

Collection of papers on collimation from D. Kaltchev:

Directory with files of LHC collimation papers

Papers from T. Risselada on LHC collimation:

List of papers on Risselada's private web page.


Last updated: 10.05.2013 (G. Valentino, BE-ABP) 04 Aug 2015