CERN Accelerating science

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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
Proton beam induced dynamics of tungsten granules / Caretta, O (Rutherford) ; Loveridge, P (Rutherford) ; O'Dell, J (Rutherford) ; Davenne, T (Rutherford) ; Fitton, M (Rutherford) ; Atherton, A (Rutherford) ; Densham, C (Rutherford) ; Charitonidis, N (CERN) ; Efthymiopoulos, I (CERN) ; Fabich, A (CERN) et al.
This paper reports the results from single-pulse experiments of a 440  GeV/$c$ proton beam interacting with granular tungsten samples in both vacuum and helium environments. Remote high-speed photography and laser Doppler vibrometry were used to observe the effect of the beam on the sample grains. [...]
2018 - 15 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 033401 Fulltext: PDF;

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2018-10-17
06:01
Thermostructural characterization and structural elastic property optimization of novel high luminosity LHC collimation materials at CERN / Borg, M (Malta U.) ; Bertarelli, A (CERN) ; Carra, F (CERN) ; Gradassi, P (CERN) ; Guardia-Valenzuela, J (CERN) ; Guinchard, M (CERN) ; Arnau Izquierdo, G (CERN) ; Mollicone, P (Malta U.) ; Sacristan-de-Frutos, O (CERN) ; Sammut, N (Malta U.)
The CERN Large Hadron Collider is currently being upgraded to operate at a stored beam energy of 680 MJ through the High Luminosity upgrade. The LHC performance is dependent on the functionality of beam collimation systems, essential for safe beam cleaning and machine protection. [...]
2018 - 15 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 031001 Fulltext: PDF;

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2018-10-17
06:01
Feasibility of diffraction radiation for noninvasive beam diagnostics as characterized in a storage ring / Bobb, L (Diamond Light Source) ; Kieffer, R (CERN) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) ; Aumeyr, T (Royal Holloway, U. of London) ; Karataev, P (Royal Holloway, U. of London) ; Billing, M (Cornell U.) ; Conway, J (Cornell U.) ; Shanks, J (Cornell U.)
In recent years, there has been an increasing demand for noninvasive beam size monitoring on particle accelerators. Ideally, these monitors should be cost effective and require little or no maintenance. [...]
2018 - 17 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 032801 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
14:54
Feasibility study of a system for measuring the LHC dipole coil stresses with capacitive probes / Gilquin, J (CERN)
CERN-AT-MA-Internal-Note-93-90 ; CERN-AT-93-90-MA ; CERN-AT-MA-93-90.
- 1993. - 16 p.
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2018-10-16
12:57
Initial Study of the Reconstruction of Boosted B-hadrons and $\tau$-leptons at FCC-hh / Perez Codina, Estel ; Roloff, Philipp Gerhard (CERN)
The FCC-hh project aims at studying proton-proton collisions at $\sqrt{s}=100$ TeV. In beyond the Standard Model scenarios, such high collision energy can produce unprecedented high-energy objects in the multi-TeV range. [...]
Geneva : CERN, 2018 Access to fulltext document: PDF;

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2018-10-16
12:14
Beam Dynamics Studies for a Fast Dump System employing a Fixed Absorber Block in the CERN PS / Arrutia Sota, Pablo Andreas
Mechanical internal dumps are used at the Proton Synchrotron (PS) to dispose of the circulating beam. [...]
CERN-ACC-NOTE-2018-0068.
- 2018. - 25 p.
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