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CERN Published Articles

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2018-10-19
04:23
Test of Ultra Fast Silicon Detectors for Picosecond Time Measurements with a New Multipurpose Read-Out Board / Minafra, Nicola (Kansas U.) ; Al Ghoul, Hussein (Kansas U.) ; Arcidiacono, Roberta (Piemonte Orientale U., Alessandria ; INFN, Turin) ; Cartiglia, Nicolo (INFN, Turin) ; Forthomme, Laurent (Kansas U.) ; Mulargia, Roberto (INFN, Turin ; Turin U. ; INFN, Turin) ; Obertino, Maria (Turin U. ; INFN, Turin) ; Royon, Christophe (Kansas U.)
Ultra Fast Silicon Detectors (UFSD) are sensors optimized for timing measurements employing a thin multiplication layer to increase the output signal. A multipurpose read-out board hosting a low-cost, low-power fast amplifier was designed at the University of Kansas and tested at the European Organization for Nuclear Research (CERN) using a 180 GeV pion beam. [...]
arXiv:1704.05298.- 2017-09-21 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 867 (2017) 88-92 Preprint: PDF;

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2018-10-17
06:01
A high-precision miniaturized rotating coil transducer for magnetic measurements / Arpaia, P (U. Naples (main) ; CERN) ; Buzio, M (CERN) ; De Oliveira, R (CERN) ; DiMarco, J (Fermilab) ; Severino, G (Sannio U.)
A miniaturized Printed Circuit Board (PCB) sensing coil, jointly developed by CERN and Fermilab for measuring the field of small-gap (less than 10 mm) accelerator magnets, is illustrated. A sensing coil array, with a scheme for compensating the main field when measuring the harmonic error components, hosted on a synthetic sapphire-based transducer, is presented. [...]
FERMILAB-PUB-18-209-TD.- 2018 - 13 p. - Published in : Sens. Actuators A 274 (2018) 37-49 Fulltext: openaccess_1-s2.0-S0924424717317533-main - PDF; fermilab-pub-18-209-td - PDF; External link: FERMILABPUB

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2018-10-17
06:01
Experimental ion mobility measurements for the LCTPC collaboration—Ar-CF$_4$ mixtures / Santos, M A G (LIP, Coimbra ; Coimbra U.) ; Kaja, M A (Warsaw U. of Tech.) ; Cortez, A F V (LIP, Coimbra ; Coimbra U.) ; Veenhof, R (CERN ; Uludag U. ; Moscow Phys. Eng. Inst.) ; Neves, P N B (Closer Consultoria, Lisbon) ; Santos, F P (LIP, Coimbra ; Coimbra U.) ; Borges, F I G M (LIP, Coimbra ; Coimbra U.) ; Conde, C A N (LIP, Coimbra ; Coimbra U.)
In this paper we present the results of the ion mobility measurements made in pure carbon tetrafluoride (CF$_4$) and gaseous mixtures of argon with carbon tetrafluoride (Ar-CF$_4$) for pressures ranging from 6 to 10 Torr (8–10.6 mbar) and for low reduced electric fields in the 10 Td to 25 Td range ($2.4-6.1 \text{kV} \cdot \text{cm}^{−1} \cdot \text{bar}^{−1}$), at room temperature. The time of arrival spectra revealed only one peak throughout the entire range studied which was attributed to CF$^+_3$. [...]
2018 - 13 p. - Published in : JINST 13 (2018) P04012 Fulltext: PDF;

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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
Metal-core pad-plane development for ACTAR TPC / Giovinazzo, J (CENBG, Gradignan) ; Pibernat, J (CENBG, Gradignan) ; Goigoux, T (CENBG, Gradignan) ; de Oliveira, R (CERN) ; Grinyer, G F (Regina U. ; GANIL) ; Huss, C (CENBG, Gradignan) ; Mauss, B (GANIL) ; Pancin, J (GANIL) ; Pedroza, J L (CENBG, Gradignan) ; Rebii, A (CENBG, Gradignan) et al.
With the recent development of active targets and time projection chambers (ACTAR TPC) as detectors for fundamental nuclear physics experiments, the need arose for charge collection planes with a high density of readout channels. In order to fulfill the mechanical constraints for the ACTAR TPC device, we designed a pad-plane based on a metal-core circuit with an conceptually simple design and routing for signal readout, named FAKIR (in reference to a fakir bed of nails). [...]
2018 - 8 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 892 (2018) 114-121

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2018-10-17
06:01
Signal detection by means of orthogonal decomposition / Hajdu, C F (Budapest, Tech. U. ; CERN) ; Dabóczi, T (Budapest, Tech. U.) ; Péceli, G (Budapest, Tech. U.) ; Zamantzas, C (CERN)
Matched filtering is a well-known method frequently used in digital signal processing to detect the presence of a pattern in a signal. In this paper, we suggest a time variant matched filter, which, unlike a regular matched filter, maintains a given alignment between the input signal and the template carrying the pattern, and can be realized recursively. [...]
2018 - 20 p. - Published in : JINST 13 (2018) P03002 Fulltext: pdf - PDF; 10.1088_1748-0221_13_03_P03002 - 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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