CERN Accelerating science

AT Articles

Последние добавления:
2010-06-24
06:29
Nonlinear predictive control in the LHC accelerator / Blanco, E (CERN) ; de Prada, C (Valladolid U.) ; Cristea, S (Valladolid U.) ; Casas, J (CERN)
This paper describes the application of a nonlinear model-based control strategy in a real challenging process. A predictive controller based on a nonlinear model derived from physical relationships, mainly heat and mass balances, has been developed and commissioned in the inner triplet heat exchanger unit (IT-HXTU) of the large hadron collider (LHC) particle accelerator at European Center for Nuclear Research (CERN). [...]
2009 - Published in : Control Eng. Pract. 17 (2009) 1136-1147

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2010-06-02
06:01
Numerical Study of Quench Protection for Fast-Ramping Accelerator Magnets / Schwerg, N (CERN) ; Auchman, B (CERN) ; Mess, K-N (CERN) ; Russenschuck, S (CERN)
The quench module of the ROXIE field computation program has been presented at previous conferences. In this paper we discuss recently implemented features that allow quench simulation of fast-ramping superconducting magnets. [...]
2009 - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 2428-2431 IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.2428-2431

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2009-07-24
11:11
Self field instability in high-$J_{c} Nb_{3}Sn$ strands with high copper residual resistivity Ratio / Bordini, B (Pisa U.) ; Rossi, L (CERN)
High critical current density (Jc) Nb3Sn conductor is the best candidate for next generation high field (> 10 T) accelerator magnets. Although very promising, state of the art high-Jc Nb3Sn strands suffer magneto-thermal instabilities that can severely limit the strand performance. [...]
CERN-AT-2008-045.- Geneva : CERN, 2009 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 2470-2476 Fulltext: PDF; IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.2470-2476

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2009-07-24
10:53
Reproducibility of the coil positioning in Nb$_3$Sn magnet models through magnetic measurements / Borgnolutti, F (CERN) ; Caspi, S (LBNL, Berkeley) ; Ferracin, P (LBNL, Berkeley) ; Kashikhin, V V (Fermilab) ; Sabbi, G (LBNL, Berkeley) ; Velev, G (Fermilab) ; Todesco, E (CERN) ; Zlobin, A V (Fermilab)
The random part of the integral field harmonics in a series of superconducting magnets has been used in the past to identify the reproducibility of the coil positioning. Using a magnetic model and a MonteCarlo approach, coil blocks are randomly moved and the amplitude that best fits the magnetic measurements is interpreted as the reproducibility of the coil position. [...]
CERN-AT-2008-044.- Geneva : CERN, 2009 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 1100-1105 Fulltext: PDF; IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.1100-1105

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2009-07-24
10:12
Open midplane designs based on sector coils in superconducting dipoles / Bruer, J (Linkoping U.) ; Todesco, E (CERN)
This paper presents a study of the effects of opening up the midplane in conventional sector coil dipoles, also known as cosè-designs. The open midplane design is a candidate for the higher luminosity upgrade for the LHC, and also for the future beta beam project at CERN, which has the heat deposition mainly concentrated in the midplane of the dipoles. [...]
CERN-AT-2008-043.- Geneva : CERN, 2009 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 1191-1194 Fulltext: PDF; IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.1191-1194

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2009-07-24
09:51
Electromagnetic efficiency of block design in superconducting dipoles / Rossi, L (CERN) ; Todesco, E (CERN)
Semi-analytical scaling laws have been derived for the electromagnetic design of superconducting dipoles based on sector coils approximation. Here we discuss the different features of block coils designs used in the past, focusing on the field quality issues, and on the efficiency of the electromagnetic design (i.e. [...]
CERN-AT-2008-042.- Geneva : CERN, 2009 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 1186-1190 Fulltext: PDF; IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.1186-1190

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2009-07-24
09:43
Heat Treatment Optimization Studies on PIT Nb$_3$Sn Strand for the NED Project / Boutboul, T (CERN) ; Oberli, L (CERN) ; den Ouden, A (Twente U. Tech., Enschede) ; Pedrini, D (INFN, Milan Bicocca) ; Seeber, B (Geneva U.) ; Volpini, G (INFN, Milan ; LASA, Segrate)
For the Next European Dipole (NED) program, a Powder-In-Tube (PIT) strand was successfully developed by SMI. This high-performance Nb3Sn strand presents a non-copper critical current density of ~ 2500 A/mm2 at 12 T applied field and 4.2 K and a filament diameter around 50 µm. [...]
CERN-AT-2008-041.- Geneva : CERN, 2009 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 2564-2567 Fulltext: PDF; IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.2564-2567

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2009-07-24
09:25
Residual strain in a Nb$_3$Sn strand mounted on a barrel for critical current measurements / Thilly, L (Futuroscope Chasseneuil, Poitiers U. LMP) ; Scheuerlein, C (CERN) ; Stuhr, U (Zurich, ETH ; PSI, Villigen) ; Bordini, B (Pisa U.) ; Seeber, B (Geneva U.)
The strain dependence of the critical properties of Nb3Sn superconducting strands is a major complication for critical current (Ic) measurements. We report neutron diffraction measurements that have been carried out at room temperature and at 10 K in order to determine the strain state of a Nb3Sn powder-in-tube (PIT) strand mounted on a critical current measurement barrel made out of a Ti-6Al-4V alloy..
CERN-AT-2008-040.- Geneva : CERN, 2009 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 2645-2648 Fulltext: PDF; IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.2645-2648

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2009-07-23
17:33
Synchrotron radiation techniques for the characterization of $Nb_{3}Sn$ superconductors / Scheuerlein, C (CERN) ; Di Michiel, M (ESRF, Grenoble) ; Buta, F (Geneva U.)
The high flux of high energy x-rays that can be provided through state-of-the-art high energy synchrotron beam lines has enabled a variety of new experiments with the highly absorbing Nb3Sn superconductors. We report different experiments with Nb3Sn strands that have been conducted at the ID15 High Energy Scattering beam line of the European Synchrotron Radiation Facility (ESRF). [...]
CERN-AT-2008-039.- Geneva : CERN, 2009 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 2653-2656 Fulltext: PDF; IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.2653-2656

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2009-07-23
17:10
Aluminum strand coating for increasing the interstrand contact resistance in Rutherford type superconducting cables / Scheuerlein, C (CERN) ; Willering, G (CERN) ; Verweij, A (CERN) ; Bonasia, A (CERN) ; Oberli, L (CERN) ; Taborelli, M (CERN) ; Richter, R (RASANT-ALCOTEC Beschichtungstechnik, Overath)
The interstrand contact resistance (Rc) in Rutherford type cables for fast cycling superconducting magnets must be sufficiently high in order to limit eddy current losses. The required value for Rc depends on the cable and magnet geometries and on the foreseen cycling rate, but is typically of the order of one mW. [...]
CERN-AT-2008-038.- Geneva : CERN, 2009 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 2463-2465 Fulltext: PDF; IEEE Published version, local copy: PDF;
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.2463-2465

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