Author: De Maria, R.
Paper Title Page
MOPGW012 Study of Fringe Fields Effects from Final Focus Quadrupoles on Beam Based Measured Quantities 90

• T. Pugnat, B. Dalena
CEA-IRFU, Gif-sur-Yvette, France
• L. Bonaventura, A. Simona
Politecnico di Milano, Milano, Italy
• R. De Maria, V.K.B. Olsen
CERN, Geneva, Switzerland

Accelerator physics needs advanced modeling and simulation techniques, in particular for beam stability studies. A deeper understanding of the effects of magnetic fields non-linearities will greatly help in the improvement of future colliders design and performance. In *, a new tracking method was proposed to study the effect of the longitudinal dependency of the harmonics on the beam dynamics. In this paper, the study will focus on the effects on observable quantities in beam based measurements, for the case of HL-LHC Inner Triplet and with possible tests in LHC.
* T. Pugnat et al., "Accurate and Efficient Tracking in Electromagnetic Quadrupoles", in Proc. IPAC’18, Vancouver, Canada, June 2018, paper THPAK004, pp. 3207.

DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW012
About • paper received ※ 14 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019
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MOPMP019 High Luminosity LHC Optics and Layout HLLHCV1.4 468

• R. De Maria, R. Bruce, D. Gamba, M. Giovannozzi, F. Plassard
CERN, Geneva, Switzerland

The goal of the High Luminosity Project is the upgrade of the LHC to deliver an integrated luminosity of at least 250 \rm fb-1 per year in each of the two high-luminosity, general-purpose detectors ATLAS and CMS. This article presents the latest layout design and the corresponding optics features, which comprise optimisation of the orbit corrector and crab cavity systems, and new estimates of the performance reach thanks to the new concept of fully remote alignment. In addition, the new optics version incorporates improvements required by beam instrumentation, dump system, and collimation system, as well as low-beta solutions for the LHCb experiment.
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPMP019
About • paper received ※ 17 April 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019
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MOPMP020 Smooth and Beta-Beating-Free Optics Transitions for HL-LHC 472

• R. De Maria, M. Solfaroli
CERN, Geneva, Switzerland

In the CERN LHC, optics transitions are mainly required to control the beam size at the four experimental interaction points. The current method, based on linearly-interpolated optics functions over a small set of matched optics and parabolic time-domain segments, introduces non-zero beta-beating and it is not optimal in time. This contribution presents an alternative approach, based on continuously-matched optics solutions distributed in time domain by using a realistic model of the superconducting circuits, which optimises the overall process duration. This method requires a change in the paradigm used in the control system and it is proposed for the future High Luminosity LHC (HL-LHC) runs.
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPMP020
About • paper received ※ 18 April 2019       paper accepted ※ 17 May 2019       issue date ※ 21 June 2019
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WEPTS026 Generalised Scattering Module in SixTrack 5 3156

• K.N. Sjobak
University of Oslo, Oslo, Norway
• H. Burkhardt, R. De Maria, V.K.B. Olsen
CERN, Geneva, Switzerland

Funding: Research Council of Norway, project 255196, and HL-LHC WP8
A generalised scattering module has recently been added to SixTrack. This module enables the use of arbitrary generators and target profiles. Presently, a simple model of elastic scattering and a coupling to Pythia8 have been implemented. This makes it possible to use SixTrack for studies of aperture losses and beam lifetime as a result of beam–beam scattering.

DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS026
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019
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WEPTS043 SixTrack Version 5: Status and New Developments 3200

• R. De Maria, J. Andersson, L. Field, M. Giovannozzi, P.D. Hermes, N. Hoimyr, G. Iadarola, S. Kostoglou, E.H. Maclean, E. McIntosh, A. Mereghetti, J. Molson, V.K.B. Olsen, D. Pellegrini, T. Persson, M. Schwinzerl
CERN, Geneva, Switzerland
• B. Dalena, T. Pugnat
CEA-IRFU, Gif-sur-Yvette, France
• K.N. Sjobak
University of Oslo, Oslo, Norway
• I. Zacharov
EPFL, Lausanne, Switzerland

SixTrack Version 5 is a major SixTrack release that introduces new features, with improved integration of the existing ones, and extensive code restructuring. New features include dynamic-memory management, scattering-routine integration, a new initial-condition module, and reviewed post-processing methods. Existing features like on-line aperture checking and Fluka-coupling are now enabled by default. Extensive performance regression tests have been developed and deployed as part of the new-release generation. The new features of the tracking environment developed for the massive numerical simulations will be discussed as well.
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS043
About • paper received ※ 17 April 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019
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THPGW057 HL-LHC Full Remote Alignment Study 3716

• A. Herty, R. De Maria, P. Fessia, D. Gamba, M. Giovannozzi, J. Hansen, I. Lamas Garcia, H. Mainaud Durand, S. Redaelli
CERN, Meyrin, Switzerland

Funding: Research supported by the HL-LHC project.
This study explores the benefits of extending the monitoring and remote alignment concept, proposed in the HL-LHC baseline, to additional components of the matching sections of the HL-LHC. The objective was to evaluate the benefits in terms of equipment performance and new opportunities for system simplification. In collaboration with the HL-LHC Working Group on Alignment, critical input parameters such as ground motion, manufacturing, assembly, and alignment tolerances, have been quantified. Solutions for the selected, manually aligned compo-nents have been investigated with the particular focus on vacuum design, mechanical design and the new alignment concept compatible with reliability and maintainability requirements. In this context, collimators and masks are key elements to be included in the extended alignment system. Their supporting systems will integrate the concept of on-line monitoring sensors and an actuator based, remote alignment platform. The full remote alignment of components will provide a positive impact to the machine operation reducing the need of human intervention in the tunnel and providing enhanced flexibility to perform the required alignment adjustment as part of an operational tool for the HL-LHC.

DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW057
About • paper received ※ 09 May 2019       paper accepted ※ 18 May 2019       issue date ※ 21 June 2019
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