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CERN Accelerating science

Accelerator Physics

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Intensity limits of the PSI Injector II cyclotron / Kolano, Anna (CERN ; PSI, Villigen ; Huddersfield U.) ; Adelmann, Andreas (PSI, Villigen) ; Barlow, Roger (Huddersfield U.) ; Baumgarten, Christian (PSI, Villigen)
We investigate limits on the current of the PSI Injector II high intensity separate-sector isochronous cyclotron, in its present configuration and after a proposed upgrade. Accelerator Driven Subcritical Reactors, neutron and neutrino experiments, and medical isotope production all benefit from increases in current, even at the ~ 10% level: the PSI cyclotrons provide relevant experience. [...]
arXiv:1707.07970.- 2018-03-21 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 885 (2018) 54-59 Preprint: PDF;

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Head-On Beam-Beam Interactions in High-Energy Hadron Colliders. GPU-Powered Modelling of Nonlinear Effects / Furuseth, Sondre
The performance of high-energy circular hadron colliders, as the Large Hadron Collider, is limited by beam-beam interactions [...]
CERN-THESIS-2017-279 - https://brage.bibsys.no/xmlui/handle/11250/2460617 : NTNU, 2017-08-15. - 119 p.

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Simulation Study of an LWFA-based Electron Injector for AWAKE Run 2 / Williamson, B. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Xia, G. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Doebert, S. (CERN) ; Karsch, S. (Munich, Max Planck Inst. Quantenopt.) ; Muggli, P. (CERN ; Munich, Max Planck Inst.)
The AWAKE experiment aims to demonstrate preservation of injected electron beam quality during acceleration in proton-driven plasma waves. [...]
- 4 p.

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Some Critical Collective Effects for the FCC-ee Collider / Belli, Eleonora (CERN) ; Castorina, Giovanni (U. Rome La Sapienza (main)) ; Migliorati, Mauro (U. Rome La Sapienza (main)) ; Persichelli, Serena (LBL, Berkeley) ; Rumolo, Giovanni (CERN) ; Spataro, Bruno (Frascati) ; Zobov, Mikhail (Frascati)
In the framework of the Future Circular Collider (FCC) design studies at CERN [1], the high luminosity electron-positron collider FCC-ee is considered as a possible first step towards FCC-hh, a 100 TeV hadron collider in the same tunnel of about 100 km. [...]
2017. - 9 p.
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Beam dynamics requirements for HL–LHC electrical circuits / Gamba, Davide (CERN) ; Arduini, Gianluigi (CERN) ; Cerqueira Bastos, Miguel (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Martino, Michele (CERN) ; Tomas Garcia, Rogelio (CERN)
A certain number of LHC magnets and relative electrical circuits will be replaced for the HL-LHC upgrade. [...]
- 2017. - 47 p.
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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. [...]
- 2017. - 13 p.
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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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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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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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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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