Paper |
Title |
Page |
MOPRO031 |
Abort Gap Cleaning for LHC Run 2 |
138 |
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- J.A. Uythoven, A. Boccardi, E. Bravin, B. Goddard, G.H. Hemelsoet, W. Höfle, D. Jacquet, V. Kain, S. Mazzoni, M. Meddahi, D. Valuch
CERN, Geneva, Switzerland
- E. Gianfelice-Wendt
Fermilab, Batavia, Illinois, USA
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To minimize the beam losses at the moment of an LHC beam dump the 3 μs long abort gap should contain as few particles as possible. Its population can be minimised by abort gap cleaning using the LHC transverse damper system. The LHC Run 1 experience is briefly recalled; changes foreseen for the LHC Run 2 are presented. They include improvements in the observation of the abort gap population and the mechanism to decide if cleaning is required, changes to the hardware of the transverse dampers to reduce the detrimental effect on the luminosity lifetime and proposed changes to the applied cleaning algorithms.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO031
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WEOCA02 |
Recent Results from CTF3 Two Beam Test Stand |
1880 |
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- W. Farabolini, F. Peauger
CEA/DSM/IRFU, France
- Ch. Borgmann, J. Ögren, R.J.M.Y. Ruber
Uppsala University, Uppsala, Sweden
- R. Corsini, D. Gamba, A. Grudiev, M.A. Khan, S. Mazzoni, J.L. Navarro Quirante, R. Pan, J.R. Towler, N. Vitoratou, K. Yaqub
CERN, Geneva, Switzerland
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From mid-2012, the Two Beam Test Stand (TBTS) in the CTF3 Experimental Facility is hosting 2 high gradient accelerating structures powered by a single power extraction and transfer structure in a scheme very close to the CLIC basic cell. We report here about the results obtained with this configuration as: energy gain and energy spread in relation with RF phases and power, octupolar transverse beam effects compared with modeling predictions, breakdown rate and breakdown locations within the structures. These structures are the first to be fitted with Wake Field Monitors (WFM) that have been extensively tested and used to further improve the structures alignment on the beam line. These results show the unique capabilities of this test stand to conduct experiments with real beams.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-WEOCA02
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THPME177 |
A Novel Approach to Synchrotron Radiation Simulation |
3687 |
SUSPSNE077 |
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- G. Trad, E. Bravin, A. Goldblatt, S. Mazzoni, F. Roncarolo
CERN, Geneva, Switzerland
- G. Trad
LPSC, Grenoble Cedex, France
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At the Large Hadron Collider (LHC) at CERN, synchrotron radiation (SR) is used to continuously monitor the transverse properties of the beams. Unfortunately the machine and beam parameters are such that the useful radiation emitted inside a separation dipole, chosen as source, is diffraction limited affecting heavily the accuracy of the measurement. In order to deconvolve the diffraction effects from the acquired beam images and in order to design an alternative monitor based on a double slit interferometer an extensive study of the synchrotron light source and of the optical propagation has been made. This study is based on simulations combining together several existing tools: SRW for the source, ZEMAX for the transport and MATLAB for the "glue" and analysis of the results. The resulting tool is very powerful and can be easily adapted to other synchrotron radiation problems. In this paper the simulation package and the way it is used will be described as well as the results obtained for the LHC and SPS cases.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-THPME177
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THPME178 |
Status of the CLIC/CTF Beam Instrumentation R&D |
3690 |
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- M. Wendt, A. Benot-Morell, B.P. Bielawski, L.M. Bobb, E. Bravin, T. Lefèvre, F. Locci, S. Magnoni, S. Mazzoni, R. Pan, J.R. Towler, E.N. del Busto
CERN, Geneva, Switzerland
- T. Aumeyr, S.T. Boogert, P. Karataev
Royal Holloway, University of London, Surrey, United Kingdom
- W.A. Gillespie, D.A. Walsh
University of Dundee, Nethergate, Dundee, Scotland, United Kingdom
- S.P. Jamison
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
- A. Lyapin, J. Snuverink
JAI, Egham, Surrey, United Kingdom
- J.M. Nappa, S. Vilalte
IN2P3-LAPP, Annecy-le-Vieux, France
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The Compact Linear Collider (CLIC) is an e+/e− collider based on the two-beam acceleration principle, proposed to support precision high-energy physics experiments in the energy range 0.5-3 TeV. To achieve a high luminosity of up to 6e34cm-2s−1, the transport and preservation of a low emittance beam is mandatory. A large number and great variety of beam diagnostics instruments is foreseen to verify and guarantee the required beam quality. We present the status of the beam diagnostics developments and experimental results accomplished at the CLIC Test Facility (CTF), including new ideas for simplification and cost reduction of the CLIC beam instrumentation.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-THPME178
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THPME184 |
Improvement of Beam Imaging Systems through Optics Propagation Simulations |
3709 |
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- B. Bolzon, T. Lefèvre, S. Mazzoni
CERN, Geneva, Switzerland
- A.S. Aryshev
KEK, Ibaraki, Japan
- B. Bolzon, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
- B. Bolzon, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
- P. Karataev, K.O. Kruchinin
Royal Holloway, University of London, Surrey, United Kingdom
- P. Karataev, K.O. Kruchinin
JAI, Egham, Surrey, United Kingdom
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Optical Transition Radiation (OTR) is emitted when a charged particle crosses the interface between two media with different dielectric properties. It has become a wide-spread method for beam profile measurements. However, there are no tools to simulate the propagation of the OTR electric field through an optical system. Simulations using ZEMAX have been performed in order to quantify optical errors, such as aberrations, diffraction, depth of field and misalignment. This paper focuses on simulations of vertically polarized OTR photons with the aim of understanding what limits the resolution of realistic beam imaging systems.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-THPME184
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THPME189 |
Simulation Studies of Diffraction Radiation |
3722 |
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- T. Aumeyr, R. Ainsworth, P. Karataev
Royal Holloway, University of London, Surrey, United Kingdom
- M.G. Billing
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
- L.M. Bobb, B. Bolzon, T. Lefèvre, S. Mazzoni
CERN, Geneva, Switzerland
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Transition Radiation (TR) and Diffraction Radiation (DR) are produced when a relativistic charged particle moves through a medium or in the vicinity of a medium respectively. The target atoms are polarised by the electric field of the charged particle, which then oscillate thus emitting radiation with a very broad spectrum. The spatial-spectral properties of TR/DR are sensitive to various electron beam parameters. Several projects aim to measure the transverse (vertical) beam size using TR or DR. This paper reports on recent studies using Zemax, presenting studies on finite beam sizes and the orientation of the beam ellipse.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-THPME189
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