CERN Accelerating science

Accelerator Physics

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2017-12-08
11:44
LHC β*-reach MD: aperture measurements at small β* / Fuster Martinez, Nuria (CERN) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN)
During this MD, performed on the 25th of July 2017, we measured the LHC aperture at top energy for β*=30 cm using the Transverse Damper (ADT) blow-up method. [...]
CERN-ACC-NOTE-2017-0064.
- 2017. - 13 p.
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2017-12-02
07:03
Coherent Beam-Beam Instability in Collisions with a Large Crossing Angle / Ohmi, K (KEK, Tsukuba) ; Kuroo, N (KEK, Tsukuba ; Tsukuba U. (main)) ; Oide, K (KEK, Tsukuba ; CERN) ; Zhou, D (KEK, Tsukuba ; CERN) ; Zimmermann, F (CERN)
In recent years the “crab-waist collision” scheme [P. Raimondi, Proceedings of 2nd SuperB Workshop, Frascati, 2006.; M. [...]
2017 - 5 p. - Published in : Phys. Rev. Lett. 119 (2017) 134801 Fulltext: PDF;

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2017-11-21
06:57
ADT and OBSBOX in 2016 / Valuch, D (CERN) ; Hofle, W (CERN) ; Kotzian, G (CERN) ; Jaussi, M (CERN) ; Rains, S (CERN) ; Ojeda-Sandonis, M (CERN) ; Soderen, M E (CERN)
A performant transverse feedback is vital for accelerators like LHC. The LHC transverse feedback (ADT) provides a lot of important data and functionality outside of the " damping envelope ". [...]
Geneva : CERN, 2017 - 4 p. - Published in : (2017) , pp. 181-184 Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.181-184

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2017-11-21
06:56
Instabilities and beam induced heating in 2016 / Carver, L R (CERN) ; Amorim, D (CERN) ; Arduini, G (CERN) ; Barranco, J (CERN) ; Biancacci, N (CERN) ; Buffat, X (CERN) ; Hofle, W (CERN) ; Iadarola, G (CERN) ; Kotzian, G (CERN) ; Levens, K (CERN) et al.
Coherent instabilities have been regularly observed during operation in 2016. Issues relating to linear coupling at injection in 2015 were no longer observed in 2016 due to new applications that were made operational, however new instabilities that caused emittance blowup were sporadically observed in Adjust and Stable Beams that do not yet have a full explanation. [...]
Geneva : CERN, 2017 - 6 p. - Published in : (2017) , pp. 141-146 Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.141-146

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2017-11-21
06:56
Experience with the ATS optics / Fartoukh, S (CERN)
The Achromatic Telescopic Squeezing (ATS) scheme is a novel optics concept which was built up in order to cope with the optics requirements of the HL-LHC, i.e. a clean (achromatic) and strong reduction of [3* compared to the LHC nominal optics. [...]
Geneva : CERN, 2017 - 12 p. - Published in : (2017) , pp. 93-104 Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.93-104

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2017-11-21
06:56
Nonlinear optics commissioning in the LHC / Maclean, E H (CERN) ; Buffat, X (CERN) ; Carlier, F (CERN) ; Fol, E (CERN) ; Malina, L (CERN) ; Persson, T H B (CERN) ; Coello De Portugal, J (CERN) ; Tomás, R (CERN) ; Skowronski, P K (CERN) ; Garcia-Tabares Valdivieso, A (CERN) et al.
So far, the LHC has operated without any dedicated commissioning of the nonlinear optics at top energy. As is reduced however, the impact of nonlinear errors in experimental insertions may become sizable. [...]
Geneva : CERN, 2017 - 10 p. - Published in : (2017) , pp. 83-92 Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.83-92

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2017-11-21
06:56
Optics control in 2016 / Persson, T (CERN) ; Baud, G (CERN) ; Carlier, F (CERN) ; Coello De Portugal, J ; Fol, E ; A ; Valdivieso, Garcia-Tabares ; Gasior, M ; Langner, A ; Maclean, E H et al.
In 2016 the fi-functions at the interaction points of ATLAS and CMS have been squeezed down to 0.4 m. This is below the design fi" = 0.55 m at 7 TeV and has been instrumental to surpass the design luminosity. [...]
Geneva : CERN, 2017 - 6 p. - Published in : (2017) , pp. 77-82 Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.77-82

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2017-11-14
17:34
What is the best displacement transducer for a seismic sensor ? / Novotny, P (CERN and Université Savoie Mont-Blanc) ; Aimard, B (LAPP IN2P3 CNRS Université Savoie Mont-Blanc) ; Balik, G (LAPP IN2P3 CNRS Université Savoie Mont-Blanc) ; Brunetti, L (LAPP IN2P3 CNRS Université Savoie Mont-Blanc) ; Caron, B (Université Savoie Mont-Blanc) ; Gaddi, A (CERN)
This paper presents a development of a seismic sensor for the future Compact Linear Collider (CLIC). Sensor in which three different types of sub-nanometre displacement transducers have been integrated: a Fabry-Pérot interferometer, an optical encoder and a capacitive transducer. [...]
CERN-ACC-2017-0095.- Geneva : CERN, 2017 - Published in : Fulltext: PDF;
In : EUSPEN's 17th International Conference and Exhibition, Hannover, Germany, 29 May - 2 Jun 2017

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2017-11-08
12:21
MD 979: Beta-beating measurements on colliding beams / Goncalves Jorge, Patrik ; Barranco Garcia, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Buffat, Xavier (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fol, Elena (University of Applied Sciences (DE)) ; Langner, Andy Sven (CERN) ; Medina Medrano, Luis Eduardo (Universidad de Guanajuato (MX)) ; Olexa, Jakub (CERN) et al.
The HL-LHC high brightness beams will give a large β-beating due to the head-on and long-range interactions since a beam-beam parameter of 0.01 per Interaction Point (IP) is expected. [...]
CERN-ACC-NOTE-2017-0060.
- 2017. - 13 p.
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2017-11-01
10:41
Compact Linear Collider component fiducialisation using Frequency Scanning Interferometry / Kamugasa, S (CERN and ETH Zurich) ; Gayde, J-C (CERN) ; Mainaud-Durand, H (CERN)
The Compact Linear Collider (CLIC) is a next generation electron-positron collider under study at CERN. One of the main technological challenges of this project is the tight pre-alignment tolerances of under 17 µm over a 200 m sliding window for its constituent components. [...]
CERN-ACC-2017-0093.- Geneva : CERN, 2017 - Published in : Fulltext: PDF;
In : EUSPEN's 17th International Conference and Exhibition, Hannover, Germany, 29 May - 2 Jun 2017

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