CERN Accelerating science

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2017-11-18
06:51
Jet energy loss and equilibration / Zapp, Korinna C (LIP, Lisbon ; CERN)
The field of jet quenching studies is witnessing an interesting development marked by the appearance of jet sub-structure observables. I give my personal view on this class of observables and comment on how they are connected to thermalisation..
2017 - 8 p. - Published in : Nucl. Phys. A 967 (2017) 81-88
In : The XXVI international conference on ultrarelativistic heavy-ion collisions, Chicago, United States Of America, 6 - 11 Feb 2017, pp.81-88

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2017-11-18
06:51
Thermal conductivity measurements of impregnated Nb3Sn coil samples in the temperature range of 3.5 K to 100 K / Koettig, T (CERN) ; Maciocha, W (CERN) ; Bermudez, S (CERN) ; Rysti, J (CERN) ; Tavares, S (CERN) ; Cacherat, F (CERN) ; Bremer, J (CERN)
In the framework of the luminosity upgrade of the LHC, high-field magnets are under development. Magnetic flux densities of up to 13 T require the use of Nb3Sn superconducting coils. [...]
2017 - Published in : IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012103 Fulltext: PDF;

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2017-11-18
06:51
Cryogenic system configuration for the International Linear Collider (ILC) at mountainous site / Nakai, H (KEK, Tsukuba) ; Okamura, T (KEK, Tsukuba) ; Delikaris, D (CERN) ; Peterson, T (Fermilab) ; Yamamoto, A (KEK, Tsukuba)
The International Linear Collider (ILC) plans to make use of ten cryoplants for its main linacs, each providing 19 kW at 4.5 K equivalent and among of it 3.6 kW at 2 K. Each cryoplant will consist of various cryogenic components such as a 4.5 K refrigerator cold box, a 2 K refrigerator cold box, and helium compressors and so on. [...]
2017 - Published in : IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012036 Fulltext: PDF;

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2017-11-18
06:51
Design and optimisation of low heat load liquid helium cryostat to house cryogenic current comparator in antiproton decelerator at CERN / Lees, A (CERN) ; Koettig, T (CERN) ; Fernandes, M (CERN) ; Tan, J (CERN)
The Cryogenic Current Comparator (CCC) is installed in the low-energy Antiproton Decelerator (AD) at CERN to make an absolute measurement of the beam intensity. Operating below 4.2 K, it is based on a superconducting quantum interference device (SQUID) and employs a superconducting niobium shield to supress magnetic field components not linked to the beam current. [...]
2017 - Published in : IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012033 Fulltext: PDF;

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2017-11-18
06:51
Investigation and performance assessment of hydraulic schemes for the beam screen cooling for the Future Circular Collider of hadron beams / Kotnig, Claudio (CERN ; Graz, Tech. U.) ; Tavian, L (CERN) ; Brenn, G (Graz, Tech. U.)
The international study at CERN of a possible future circular collider (FCC) considers an option for a very high energy hadron-hadron collider located in a quasi-circular underground tunnel of about 100 km of length. The technical segmentation of the collider foresees continuously cooled sections of up to 10.4 km; throughout the entire section length, more than 600 kW of heat mainly generated by the beam synchrotron radiation must be removed from the beam screen circuits at a mean temperature of 50 K. [...]
2017 - Published in : IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012006 Fulltext: PDF;

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2017-11-18
06:51
Simplified SEE Sensitivity Screening for COTS Components in Space / García Alía, Rubén (CERN) ; Brugger, Markus (CERN) ; Daly, Eamonn (ESTEC, Noordwijk) ; Danzeca, Salvatore (CERN) ; Ferlet-Cavrois, Véronique (ESTEC, Noordwijk) ; Gaillard, Rémi (Unlisted, FR) ; Mekki, Julien (CNES, Toulouse) ; Poivey, Christian (ESTEC, Noordwijk) ; Zadeh, Ali (ESTEC, Noordwijk)
We introduce an approach aimed at prescreening COTS components according to their single-event effect (SEE) sensitivity for space missions in which a complete characterization of their individual response to protons and heavy ions is not feasible due to cost and time constraints. The method is applied to a set of SRAM memories for single-event upset (SEU) and single-event latchup (SEL) and the resulting expected SEE rates are compared with traditional approaches and in-flight data for a low-earth orbit polar and a geostationary orbit. [...]
2017 - 9 p. - Published in : IEEE Trans. Nucl. Sci. 64 (2017) 882-890

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2017-11-18
06:51
Experimental results of beryllium exposed to intense high energy proton beam pulses / Ammigan, K (Fermilab) ; Hartsell, B (Fermilab) ; Hurh, P (Fermilab) ; Zwaska, R (Fermilab) ; Butcher, M (CERN) ; Guinchard, M (CERN) ; Calviani, M (CERN) ; Losito, R (CERN) ; Roberts, S (Oxford U. ; Culham Lab) ; Kuksenko, V (Oxford U.) et al.
Beryllium is extensively used in various accelerator beam lines and target facilities as a material for beam windows, and to a lesser extent, as secondary particle production targets. With increasing beam intensities of future accelerator facilities, it is critical to understand the response of beryllium under extreme conditions to reliably operate these components as well as avoid compromising particle production efficiency by limiting beam parameters. [...]
FERMILAB-CONF-16-405-AD.- 2017 - 4 p. - Published in : 10.18429/JACoW-NAPAC2016-MOPOB14 Fulltext: PDF; External link: FERMILABCONF

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2017-11-18
06:51
Field Quality Measurements in the FNAL Twin-Aperture 11 T Dipole for LHC Upgrades / Strauss, T (Fermilab) ; Apollinari, G (Fermilab) ; Barzi, E (Fermilab) ; Chlachidze, G (Fermilab) ; Di Marco, J (Fermilab) ; Nobrega, F (Fermilab) ; Novitski, I (Fermilab) ; Stoynev, S (Fermilab) ; Turrioni, D (Fermilab) ; Velev, G (Fermilab) et al.
FNAL and CERN are developing an 11 T Nb3Sn dipole suitable for installation in the LHC to provide room for additional collimators. Two 1 m long collared coils previously tested at FNAL in single-aperture dipole configuration were assembled into the twin-aperture configuration and tested including magnet quench performance and field quality. [...]
FERMILAB-CONF-16-520-TD; NAPAC-2016-MOPOB41.- 2017 - 4 p. - Published in : 10.18429/JACoW-NAPAC2016-MOPOB41 Fulltext: PDF; External links: FERMILABCONF; JACoW

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2017-11-18
06:51
First Test Results of the 150 mm Aperture IR Quadrupole Models for the High Luminosity LHC / Ambrosio, G (Fermilab) ; Chlachidze, G (Fermilab) ; Wanderer, P (Brookhaven) ; Ferracin, P (CERN) ; Sabbi, G (LBNL, Berkeley) /LARP
The High Luminosity upgrade of the LHC at CERN will use large aperture (150 mm) quadrupole magnets to focus the beams at the interaction points. The high field in the coils requires Nb3Sn superconductor technology, which has been brought to maturity by the LHC Accelerator Re-search Program (LARP) over the last 10 years. [...]
FERMILAB-CONF-16-440-TD.- 2017 - 6 p. - Published in : 10.18429/JACoW-NAPAC2016-WEB3IO02 Fulltext: PDF; External link: FERMILABCONF

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2017-11-16
07:23
Study of the radiation induced effects in the LHCb Vertex Locator / Szumlak, Tomasz (AGH-UST, Cracow) /LHCb VELO Group
LHCb is a dedicated heavy-flavour physics experiment at the Large Hadron Collider at CERN. The VErtex LOcator (VELO) is a critical part of a LHCb tracking system, enabling the full topological reconstruction of beauty and charm mesons’ decays and providing essential input for the High Level Trigger (HLT) system used by the experiment to select events. [...]
2016 - 6 p. - Published in : Acta Phys. Pol. B 47 (2016) 441-446 fulltext: PDF;
In : 1st Jagiellonian Symposium on Fundamental and Applied Subatomic Physics, Krakow, Poland, 07 - 13 Jun 2015, pp.441-446

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