CERN Accelerating science

All CERN Accelerators documents

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This new collection aggregates CERN accelerator-related documents on CDS. It will continuously be enriched and improved in the near future.
Latest additions:
2014-10-24
11:43
Test and Simulation Results for Quenches Induced by Fast Losses on a LHC Quadrupole / Bracco, Ch (CERN, Switzerland) ; Auchmann, B (CERN, Switzerland) ; Bartmann, W (CERN, Switzerland) ; Bednarek, M (CERN, Switzerland) ; Lechner, A (CERN, Switzerland) ; Sapinski, M (CERN, Switzerland) ; Vittal Shetty, N (CERN, Switzerland) ; Schmidt, R (CERN, Switzerland) ; Solfaroli Camillocci, M (CERN, Switzerland) ; Verweij, A (CERN, Switzerland)
A test program for beam induced quenches was started in the LHC in 2011 in order to reduce as much as possible BLM-triggered beam dumps, without jeopardising the safety of the superconducting magnets. A first measurement was performed to asses the quench level of a quadrupole located in the LHC injection region in case of fast (ns) losses. [...]
CERN-ACC-2014-0232.- Geneva : CERN, 2014 - 4 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.IPAC

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2014-10-23
08:00
Beam-beam study of ERL based eRHIC / Hao, Y (Brookhaven) ; Litvinenko, V N (Brookhaven) ; Ptitsyn, V (Brookhaven)
Beam-beam effects in eRHIC, the proposed ERL-based Electron-Ion Collider (EIC) at BNL, have several unique features distinguishing them from those in hadron-colliders and lepton-colliders. Taking the advantage of the fact that the electron beam is used only once, we expect the luminosity to be 10 times greater than for the ring-ring collision scheme with similar parameters. [...]
arXiv:1410.6000.- Geneva : CERN, 2014 - 6 p. - Published in : CERN Yellow Report CERN-2014-004, pp.243-248 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : Proceedings of the ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders (BB2013), CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.243-248

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2014-10-23
08:00
Simulation of beam-beam induced emittance growth in the HL-LHC with crab cavities / Paret, S (LBNL, Berkeley) ; Qiang, J (LBNL, Berkeley)
The emittance growth in the HL-LHC due to beam-beam effects is examined by virtue of strong-strong computer simulations. A model of the transverse damper and the noise level have been tuned to simulate the emittance growth in the present LHC. [...]
arXiv:1410.5964.- Geneva : CERN, 2014 - 6 p. - Published in : CERN Yellow Report CERN-2014-004, pp.237-242 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : Proceedings of the ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders (BB2013), CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.237-242

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2014-10-23
08:00
Beam-beam-induced orbit effects at LHC / Schaumann, M (RWTH Aachen U.) ; Fernandez, R Alemany (CERN)
For high bunch intensities the long-range beam-beam interactions are strong enough to provoke effects on the orbit. As a consequence the closed orbit changes. [...]
arXiv:1410.5951.- Geneva : CERN, 2014 - 5 p. - Published in : CERN Yellow Report CERN-2014-004, pp.231-235 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : Proceedings of the ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders (BB2013), CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.231-235

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2014-10-23
07:59
Analysis of long-range studies in the LHC - Comparison with the model / Kaltchev, D (TRIUMF) ; Herr, W (CERN)
We find that the observed dependencies (scaling) of long-range beam-beam effects on the beam separation and intensity are consistent with the simple assumption that, all other parameters being the same, the quantity preserved during different set-ups is the first-order smear as a function of amplitude..
arXiv:1410.5946.- Geneva : CERN, 2014 - 8 p. - Published in : CERN Yellow Report CERN-2014-004, pp.93-100 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : Proceedings of the ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders (BB2013), CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.93-100

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2014-10-23
07:59
Beam-beam observations in the RHIC / Luo, Y (Brookhaven) ; Fischer, W (Brookhaven)
The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory has been in operation since 2000. Over the past decade, the luminosity in the polarized proton (p-p) operations has increased by more than one order of magnitude. [...]
arXiv:1410.5936.- Geneva : CERN, 2014 - 7 p. - Published in : CERN Yellow Report CERN-2014-004, pp.19-25 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : Proceedings of the ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders (BB2013), CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.19-25

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2014-10-23
07:59
Coherent beam-beam mode in the LHC / Buffat, X (EPFL, Lausanne) ; Calaga, R (CERN) ; Giachino, R (CERN) ; Herr, W (CERN) ; Papotti, G (CERN) ; Pieloni, T (CERN) ; White, S (Brookhaven)
Observations of single bunch beam-beam coherent modes during dedicated experiments in the LHC are presented. Their role in standard operation for physics is discussed and, in particular, candidates of beam-beam coherent mode driven unstable by the machine impedance are presented..
arXiv:1410.5695.- Geneva : CERN, 2014 - 4 p. - Published in : CERN Yellow Report CERN-2014-004, pp.227-230 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders, CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.227-230

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2014-10-23
07:59
Beam-beam and impedance / White, S (Brookhaven) ; Buffat, X (EPFL, Lausanne)
As two counter-rotating beams interact they can give rise to coherent dipole modes. Under the influence of impedance these coherent beam-beam modes can couple to higher order head-tail modes and lead to strong instabilities. [...]
arXiv:1410.5685.- Geneva : CERN, 2014 - 9 p. - Published in : CERN Yellow Report CERN-2014-004, pp.217-225 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders, CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.217-225

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2014-10-23
07:59
BTF measurements with beam-beam interactions / Gorgen, P (Darmstadt, Tech. U.) ; Boine-Frankenheim, O (Darmstadt, Tech. U.) ; Fischer, W (Brookhaven)
We present considerations about the transverse beam transfer function (BTF) of beams under the influence of two effects: The strong-strong beam-beam effect and the influence of a Gaussian electron lens. The BTF are investigated using two methods: BTF excitation is simulated in a particle-in-cell (PIC) code. [...]
arXiv:1410.5661.- Geneva : CERN, 2014 - 5 p. - Published in : CERN Yellow Report CERN-2014-004, pp.211-215 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders, CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.211-215

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2014-10-23
07:59
Operational considerations on the stability of colliding beams / Buffat, X (EPFL, Lausanne) ; Herr, W (CERN) ; Pieloni, T (CERN)
While well studied in the absence of beam-beam and while colliding head-on, the stability of the LHC beams can be very critical in intermediate steps. During the squeeze, the long-range beam-beam interaction becomes a critical component of the beam's dynamics. [...]
arXiv:1410.5655.- Geneva : CERN, 2014 - 5 p. - Published in : CERN Yellow Report CERN-2014-004, pp.193-197 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders, CERN, Geneva, Switzerland, 18 - 22 Mar 2013, pp.193-197

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