CERN Accelerating science

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2018-07-21
11:21
Design of the Optional Forward Superconducting Dipole Magnet for the FCC-hh Detector / Bielert, Erwin R (CERN) ; Berriaud, Christophe (Saclay) ; Cure, Benoit (CERN) ; Dudarev, Alexey (CERN) ; Gaddi, Andrea (CERN) ; Gerwig, Hubert (CERN) ; Ilardi, Veronica (Twente U., Enschede ; CERN) ; ten Kate, Herman H J (CERN) ; Klyukhin, Vyacheslav I (SINP, Moscow ; CERN) ; Kulenkampff, Tobias K D (TU Vienna ; CERN) et al.
A 4-T, 10-m free bore and 20-m long central solenoid is proposed as the main magnet in the baseline detector for the future circular collider (FCC) hadron–hadron collisions physics program. Besides the 4-T axial magnetic field around the interaction point in the center of the main solenoid, additionally, magnetic field is required in the forward directions. [...]
2018 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4500204
In : 13th European Conference on Applied Superconductivity, ICCG, Geneva, Switzerland, 17 - 21 Sep 2017, pp.4500204

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2018-07-21
11:21
Characterization of Nb$_3$Sn Rutherford Cable Degradation Due to Strands Cross-Over / Fleiter, Jérôme (CERN) ; Peggiani, Sonia (Milan Polytechnic ; CERN) ; Bonasia, Angelo (CERN) ; Ballarino, Amalia (CERN)
The quadrupole and dipole magnets for the LHC high luminosity upgrade will be based on Nb3Sn Rutherford cables that operate at 1.9 K and experience magnetic fields larger than 12 T. The Nb3Sn Rutherford cables are assembled via a planetary machine able to produce the trapezoidal geometry with the required mechanical tolerances (about ±0.01 mm) and low critical current degradation (<;5%). [...]
2018 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4802205

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2018-07-21
11:21
Design of a High Field ${\rm Nb}_{3}{\rm Al}$ Common Coil Magnet / Xu, Qingjin (KEK, Tsukuba) ; Sasaki, Kenichi (KEK, Tsukuba) ; Nakamoto, Tatsushi (KEK, Tsukuba) ; Terashima, Akio (KEK, Tsukuba) ; Tsuchiya, Kiyosumi (KEK, Tsukuba) ; Yamamoto, Akira (KEK, Tsukuba) ; Kikuchi, Akihiro (Tsukuba Magnet Lab.) ; Takeuchi, Takao (Tsukuba Magnet Lab.) ; Sabbi, Gian-Luca (LBNL, Berkeley) ; Caspi, Shlomo (LBNL, Berkeley) et al.
A high field Nb3Al common coil magnet is under development as an R&D; of "Advanced Superconducting Magnets for the LHC Luminosity Upgrade", in the framework of the CERN-KEK cooperation program. The goal of this research is to demonstrate the feasibility of high field magnet wound with Nb3Al cable. [...]
2010 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 20 (2010) 176-179
In : 21st International Conference on Magnet Technology, Hefei, China, 18 - 23 Oct 2009, pp.176-179

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2018-07-21
11:21
Instrumentation and Quench Protection for LARP ${\rm Nb}_{3}{\rm Sn}$ Magnets / Felice, H (LBNL, Berkeley) ; Ambrosio, G (Fermilab) ; Chlachidze, G (Fermilab) ; Ferracin, P (LBNL, Berkeley) ; Hafalia, R (LBNL, Berkeley) ; Hannaford, R C (LBNL, Berkeley) ; Joseph, J M (LBNL, Berkeley) ; Lietzke, A F (LBNL, Berkeley) ; McInturff, A D (TAMU, College Station) ; Muratore, J F (Brookhaven Natl. Lab.) et al.
The US LHC Accelerator Research Program (LARP) is developing Nb3Sn prototype quadrupoles for the LHC interaction region upgrades. Several magnets have been tested within this program and understanding of their behavior and performance is a primary goal. [...]
2009 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 2458-2462
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.2458-2462

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2018-07-21
11:21
Design and Fabrication of a Supporting Structure for 3.6 m Long Nb$_{3}$Sn Racetrack Coils / Ferracin, P (LBNL, Berkeley) ; Ambrosio, G (Fermilab) ; Anerella, M (Brookhaven Natl. Lab.) ; Barzi, E (Fermilab) ; Caspi, S (LBNL, Berkeley) ; Cheng, D W (LBNL, Berkeley) ; Dietderich, D R (LBNL, Berkeley) ; Gourlay, S A (LBNL, Berkeley) ; Hafalia, A R (LBNL, Berkeley) ; Hannaford, C R (LBNL, Berkeley) et al.
As part of the LHC accelerator research program (LARP), three US national laboratories (BNL, FNAL, and LBNL) are currently engaged in the development of superconducting magnets for the LHC interaction regions (IR) beyond the current design. As a first step towards the development of long Nb3Sn quadrupole magnets, a 3.6 m long structure, based on the LBNL subscale common-coil magnet design, will be fabricated, assembled, and tested with aluminum-plate "dummy coils". [...]
2007 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 17 (2007) 1023-1026
In : Applied Superconductivity Conference, Seattle, WA, USA, 27 Aug - 1 Sep 2006, pp.1023-1026

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2018-07-19
07:39
Test Results of LARP 3.6 m ${\rm Nb}_{3}{\rm Sn}$ Racetrack Coils Supported by Full-Length and Segmented Shell Structures / Muratore, J F (Brookhaven Natl. Lab.) ; Ambrosio, G (Fermilab) ; Anerella, M (Brookhaven Natl. Lab.) ; Barzi, E (Fermilab) ; Bossert, R (Fermilab) ; Caspi, S (LBNL, Berkeley) ; Cheng, D W (LBNL, Berkeley) ; Cozzolino, J (Brookhaven Natl. Lab.) ; Dietderich, D R (LBNL, Berkeley) ; Escallier, J (Brookhaven Natl. Lab.) et al.
As part of the LHC Accelerator Research Program (LARP) to build a high performance quadrupole magnet with Nb$_3$Sn conductor, a pair of 3.6 m-long Nb$_3$Sn racetrack coils has been made at Brookhaven National Laboratory (BNL) and installed in two shell-type support structures built by Lawrence Berkeley National Laboratory (LBL). These magnet assemblies have been tested at 4.5 K at BNL to gauge the effect of extended length and prestress on the mechanical performance of the long structure compared to earlier short models. [...]
2009 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 1212-1216
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.1212-1216

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2018-07-19
07:39
Fabrication and Test of a 3.7 m Long Support Structure for the LARP ${\hbox{Nb}}_{3}{\hbox{Sn}}$ Quadrupole Magnet LQS01 / Ferracin, P (LBNL, Berkeley) ; Ambrosio, G (Fermilab) ; Anerella, M (Brookhaven Natl. Lab.) ; Bingham, B (LBNL, Berkeley) ; Bossert, R (Fermilab) ; Caspi, S (LBNL, Berkeley) ; Cheng, D W (LBNL, Berkeley) ; Felice, H (LBNL, Berkeley) ; Hafalia, A R (LBNL, Berkeley) ; Hannaford, C R (LBNL, Berkeley) et al.
The 3.7 m long quadrupole magnet LQS01 represents a major step of the US LHC Accelerator Research Program (LARP) towards the development of long Nb$_3$Sn accelerator quadrupole magnets for a LHC Luminosity upgrade. The magnet support structure is a scale up of the 1 m long Technology Quadrupole TQS design with some modifications suggested by TQS model test results. [...]
2009 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 1106-1111
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.1106-1111

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2018-07-19
07:39
Test results of TQS03: A LARP shell-based Nb$_3$Sn quadrupole using 108/127 conductor / Felice, H (LBNL, Berkeley) ; Ambrosio, G (Fermilab) ; Bajko, M (CERN) ; Barzi, E (Fermilab) ; Bordini, B (CERN) ; Bossert, R (Fermilab) ; Caspi, S (LBNL, Berkeley) ; Dietderich, D (LBNL, Berkeley) ; Ferracin, P (LBNL, Berkeley) ; Feuvrier, J (CERN) et al.
Future insertion quadrupoles with large apertures and high gradients will be required for the Phase II luminosity upgrade (10$^{35}$ cm$^{−2}$s$^{−1}$) of the Large Hadron Collider (LHC). Although improved designs, based on NbTi, are being considered as an intermediate step for the Phase I upgrade, the Nb$_3$Sn conductor is presently the best option that meets the ultimate performance goals for both operating field and temperature margin. [...]
2010 - 14 p. - Published in : J. Phys. : Conf. Ser. 234 (2010) 032010 Fulltext: PDF;

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2018-07-17
06:56
Modelling of proton irradiated GaN-based high-power white light-emitting diodes / Floriduz, Alessandro (CERN) ; Devine, James D (CERN)
We report the effects of high-energy (23 GeV) proton irradiation at large fluences on packaged high-power GaN-based white light-emitting diodes with YAG:Ce phosphors. From optical and electrical measurements, we assume that proton irradiation degrades only the GaN LED die up to fluences of at least $2 \times 10^{14}$p/cm$^{2}$, and we demonstrate that it produces nonradiative recombination centres which increase the leakage current and diminish the carrier density in the quantum wells and hence the output optical power. [...]
2018 - Published in : Jpn. J. Appl. Phys. 57 (2018) 080304 Fulltext: PDF;

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2018-07-17
04:12
Exploring cosmic origins with CORE: Survey requirements and mission design / CORE Collaboration
Future observations of cosmic microwave background (CMB) polarisation have the potential to answer some of the most fundamental questions of modern physics and cosmology. In this paper, we list the requirements for a future CMB polarisation survey addressing these scientific objectives, and discuss the design drivers of the CORE space mission proposed to ESA in answer to the "M5" call for a medium-sized mission. [...]
arXiv:1706.04516.- 2018-04-05 - 79 p. - Published in : JCAP 1804 (2018) 014 Preprint: PDF;

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