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Accelerator Physics

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2018-10-17
06:01
Cross-wake force and correlated head-tail instability in beam-beam collisions with a large crossing angle / Kuroo, Nami (KEK, Tsukuba ; Tsukuba U. (main)) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Oide, Katsunobu (KEK, Tsukuba ; CERN) ; Zhou, Demin (KEK, Tsukuba ; CERN) ; Zimmermann, Frank (CERN)
This paper discusses novel coherent beam-beam instability in collisions with a large crossing angle. The instability appears in the correlated head-tail motion of two colliding beams. [...]
2018 - 15 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 031002 Fulltext: PDF;

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2018-10-17
06:01
Beam measurement of the high frequency impedance sources with long bunches in the CERN Super Proton Synchrotron / Lasheen, A (CERN ; Orsay) ; Argyropoulos, T (CERN) ; Bohl, T (CERN) ; Esteban Müller, J  F (CERN) ; Timko, H (CERN) ; Shaposhnikova, E (CERN)
Microwave instability in the Super Proton Synchrotron (SPS) at CERN is one of the main limitations to reach the requirements for the High Luminosity-LHC project (increased beam intensity by a factor 2). To identify the impedance source responsible of the instability, beam measurements were carried out to probe the SPS impedance. [...]
2018 - 13 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 034401 Fulltext: PDF;

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2018-10-17
06:01
Experimental Observation of “Shadowing” in Optical Transition Radiation / Kieffer, R (CERN) ; Bergamaschi, M (CERN ; Royal Holloway, U. of London) ; Bravin, E (CERN) ; Farabolini, W (CERN) ; Karataev, P (Royal Holloway, U. of London) ; Lefevre, T (CERN) ; Mazzoni, S (CERN)
We report the observation of shadowing between two optical transition radiation (OTR) sources from a 205 MeV electron beam. The total optical intensity is measured as a function of the distance $d$ between the sources, covering the range $0 \lt d \lt 4L_{\nu}$, where $L_{\nu}$ is the formation length of the particles. [...]
2018 - 5 p. - Published in : Phys. Rev. Lett. 120 (2018) 094802 Fulltext: PDF;

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2018-10-17
06:01
Development and validation of a multilateration test bench for particle accelerator pre-alignment / Kamugasa, Solomon William (CERN ; Zurich, ETH) ; Rothacher, Markus (Zurich, ETH) ; Gayde, Jean-Christophe (CERN) ; Mainaud Durand, Helene (CERN)
The development and validation of a portable coordinate measurement solution for fiducialization of compact linear collider (CLIC) components is presented. This new solution addresses two limitations of high-accuracy state-of-the-art coordinate measuring machines, i.e. [...]
2018 - 11 p. - Published in : Meas. Sci. Technol. 29 (2018) 034010

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2018-10-16
06:47
Quadrupole-free detector optics design for the Compact Linear Collider final focus system at 3 TeV / Plassard, Fabien (CERN) ; Latina, Andrea (CERN) ; Marin, Eduardo (CERN) ; Tomás, Rogelio (CERN) ; Bambade, Philip (Orsay, LAL)
Aiming to simplify the machine detector interface of the Compact Linear Collider (CLIC), a new detector model has been designed allowing the last quadrupole QD0 of the final focus system (FFS) to be located outside of the experiment with a distance L* from the interaction point of 6 m. In this paper, the beam delivery system (BDS) has been reoptimized, offering a luminosity performance that exceeds the design requirements by 11% for the total luminosity and by 7% in the energy peak. [...]
2018 - 13 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 011002 Fulltext: PDF;

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2018-10-15
17:33
Beam optics calculations for CLIC / Pastushenko, Andrii
This Master's thesis was done in the framework of the Master 2 Grands Instruments program of Université Paris Sud and was conducted at the European Organization for Nuclear Research (CERN) [...]
CERN-THESIS-2018-192 - 49 p.

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2018-10-15
16:50
Optimization of the Beam Size at the Interaction Point of the Accelerator Test Facility 2 / Cilento, Vera
A new era of discovery in particle physics has opened in November 2009 with the start-up of the Large Hadron Collider (LHC) at CERN, the European Organization for Nuclear Research, in Geneva, Switzerland [...]
CERN-THESIS-2018-191 - 82 p.

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2018-10-15
13:29
Design and Beam Dynamics Studies for 5 GeV Electron Linac in CLIC Positron Source / Keskin, Umut
CLIC (Compact Linear Collider) and ILC (International Linear Collider) are the two future linear collider projects after LHC (Large Hadron Collider) era [...]
CERN-THESIS-2018-190 - Abant Izzet Baysal University, Bolu, Turkey : Umut Keskin, 2018-06-19. - 68 p.

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2018-10-11
15:10
Luminosity Performance Limitations Due to the Beam-Beam Interaction in the Large Hadron Collider / Crouch, Matthew Paul
In the Large Hadron Collider (LHC), particle physics events are created by colliding high energy proton beams at a number of interaction points around the ring [...]
CERN-THESIS-2017-420 - 240 p.

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2018-10-10
16:26
Round telescopic optics with large telescopic index / Fartoukh, Stephane (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fuster Martinez, Nuria (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) et al.
This paper highlights the main results from the 2017 LHC MD program which was deployed to commission round ATS optics with high telescopic index, and ultimately to study their properties in terms of long-range beam-beam effect and octupole thresholds for coherent instabilities (MD2269) [...]
CERN-ACC-2018-0032. - 2018. - 24 p.

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