CERN Accelerating science

CERN Published Articles

Letzte Einträge:
2017-05-24
16:54
Effect of ions on sulfuric acid-water binary particle formation: 2. Experimental data and comparison with QC-normalized classical nucleation theory / Duplissy, J. ; Merikanto, J. ; Franchin, A. ; Tsagkogeorgas, G. ; Kangasluoma, J. ; Wimmer, D. ; Vuollekoski, H. ; Schobesberger, S. ; Lehtipalo, K. ; Flagan, R. C. et al.
2016 - 4 p. - Published in : Journal of Geophysical Research: Atmospheres 121 (2016) 1752-1775

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2017-05-24
06:44
Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb3Sn conductors / Segal, Christopher ; Tarantini, Chiara ; Sung, Zu Hawn ; Lee, Peter J ; Sailer, Bernd ; Thoener, Manfred ; Schlenga, Klaus ; Ballarino, Amalia ; Bottura, Luca ; Bordini, Bernardo et al.
High critical current density (J c) Nb3Sn A15 multifilamentary wires require a large volume fraction of small grain (SG), superconducting A15 phase, as well as Cu stabilizer with high Residual Resistance Ratio (RRR) to provide electromagnetic stabilization and protection. In powder-in-tube (PIT) wires the unreacted Nb7.5 wt%Ta outer layer of the tubular filaments acts as a diffusion barrier and protects the interfilamentary Cu stabilizer from Sn contamination. [...]
2016 - Published in : Supercond. Sci. Technol. 29 (2016) 085003

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2017-05-24
06:44
/ Ericson, Torleif E. O. (CERN) ; Dietz, Barbara (Darmstadt, Tech. Hochsch.) ; Richter, Achim (Warsaw, CFT ; Darmstadt, Tech. Hochsch.)
Exact analytical expressions for the cross-section correlation functions of chaotic scattering sys- tems have hitherto been derived only under special conditions. The objective of the present article is to provide expressions that are applicable beyond these restrictions. [...]
arXiv:1605.07217.- 2016 - Published in : Phys. Rev. E 94 (2016) 042207 Preprint: PDF;

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2017-05-24
06:44
Electro-mechanical characterization of MgB2 wires for the Superconducting Link Project at CERN / Konstantopoulou, K (CERN ; Madrid, CIEMAT) ; Ballarino, A (CERN) ; Gharib, A (CERN) ; Stimac, A (CERN) ; Gonzalez, M Garcia (CERN) ; Fontenla, A T Perez (CERN) ; Sugano, M (KEK, Tsukuba)
In previous years, the R & D program between CERN and Columbus Superconductors SpA led to the development of several configurations of MgB2 wires. The aim was to achieve excellent superconducting properties in high-current MgB2 cables for the HL-LHC upgrade. [...]
2016 - Published in : Supercond. Sci. Technol. 29 (2016) 084005

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2017-05-24
06:44
Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading / Grether, A (CERN) ; Scheuerlein, C (CERN) ; Ballarino, A (CERN) ; Bottura, L (CERN)
We have studied the influence of transverse compressive stress on the resistance and critical current (I c ) of soldered REBCO tape lap splices. Internal contact resistances dominate the overall REBCO lap splice resistances. [...]
2016 - Published in : Supercond. Sci. Technol. 29 (2016) 074004

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2017-05-24
06:44
Evaluation of Young’s modulus of MgB2 filaments in composite wires for the superconducting links for the high-luminosity LHC upgrade / Sugano, Michinaka ; Ballarino, Amalia ; Bartova, Barbora ; Bjoerstad, Roger ; Gerardin, Alexandre ; Scheuerlein, Christian (CERN)
MgB2 wire is a promising superconductor for the superconducting links for the high-luminosity upgrade of the large Hadron collider at CERN. The mechanical properties of MgB2 must be fully quantified for the cable design, and in this study, we evaluate the Young's modulus of MgB2 filaments in wires with a practical level of critical current. [...]
2015 - Published in : Supercond. Sci. Technol. 29 (2015) 025009

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2017-05-24
06:44
Studies of the beam extraction system of the GTS-LHC electron cyclotron resonance ion source at CERN / Toivanen, V (CERN) ; Küchler, D (CERN)
The 14.5 GHz GTS-LHC Electron Cyclotron Resonance Ion Source (ECRIS) provides multiply charged heavy ion beams for the CERN experimental program. The GTS-LHC beam formation has been studied extensively with lead, argon, and xenon beams with varied beam extraction conditions using the ion optical code IBSimu [...]
2016 - Published in : Rev. Sci. Instrum. 87 (2016) 02B923

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2017-05-24
06:44
Determination of discharge parameters via OES at the Linac4 H− ion source / Briefi, S (Augsburg U.) ; Fink, D (CERN) ; Mattei, S (CERN) ; Lettry, J (CERN) ; Fantz, U (Augsburg U. ; Garching, Max Planck Inst. Plasmaphys.)
Optical emission spectroscopy (OES) measurements of the atomic Balmer series and the molecular Fulcher transition have been carried out at the Linac4 ion source in order to determine plasma parameters. As the spectroscopic system was only relatively calibrated, the data evaluation only yielded rough estimates of the plasma parameters (Te ≈ 1.2 eV, ne ≈ 1 × 1019 m−3, and n H/nH2 ≈ 0.5 at standard operational parameters). [...]
2016 - Published in : Rev. Sci. Instrum. 87 (2016) 02B104

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2017-05-24
06:44
Numerical study of plasma generation process and internal antenna heat loadings in J-PARC RF negative ion source / Shibata, T (J-PARC) ; Nishida, K (Keio U.) ; Mochizuki, S (Keio U.) ; Mattei, S (CERN) ; Lettry, J (CERN) ; Hatayama, A (Keio U.) ; Ueno, A (J-PARC) ; Oguri, H (J-PARC) ; Ohkoshi, K (J-PARC) ; Ikegami, K (J-PARC) et al.
A numerical model of plasma transport and electromagnetic field in the J-PARC (Japan Proton Accelerator Research Complex) radio frequency ion source has been developed to understand the relation between antenna coil heat loadings and plasma production/transport processes. From the calculation, the local plasma density increase is observed in the region close to the antenna coil. [...]
2016 - 3 p. - Published in : Rev. Sci. Instrum. 87 (2016) 02B128

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2017-05-24
06:44
Vibration measurements of a wire scanner – Experimental setup and models / Herranz, Juan (CERN ; Barcelona, Polytechnic U.) ; Barjau, Ana (Barcelona, Polytechnic U.) ; Dehning, Bernd (CERN)
The critical process of beam loading compensation in high intensity accelerators brings under control the undesired effect of the beam induced fields to the accelerating structures. A new analytical approach for optimizing standing wave accelerating structures is found which is hugely fast and agrees very well with simulations. [...]
2016 - 21 p. - Published in : Mech. Syst. Sig. Proc. 70-71 (2016) 974-994

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