2017-06-22
08:23 |
Measurements of 55Fe activity in activated steel samples with GEMPix
/ Curioni, A (CERN ; Milan Polytechnic) ; Dinar, N (CERN ; Paris U., VI-VII) ; La Torre, F P (CERN) ; Leidner, J (CERN ; RWTH Aachen U.) ; Murtas, F (CERN ; Frascati) ; Puddu, S (CERN) ; Silari, M (CERN)
In this paper we present a novel method, based on the recently developed GEMPix detector, to measure the 55Fe content in samples of metallic material activated during operation of CERN accelerators and experimental facilities. The GEMPix, a gas detector with highly pixelated read-out, has been obtained by coupling a triple Gas Electron Multiplier (GEM) to a quad Timepix ASIC. [...]
2017 - 12 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 849 (2017) 60-71
NIMA OA article: PDF;
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2017-06-22
08:23 |
Fabrication of First 4-m Coils for the LARP MQXFA Quadrupole and Assembly in Mirror Structure
/ Holik, E F (Fermilab ; Angelo State U.) ; Ambrosio, G (Fermilab) ; Anerella, M (Brookhaven) ; Bossert, R (Fermilab) ; Cavanna, E (CERN) ; Cheng, D (LBNL, Berkeley) ; Dietderich, D R (LBNL, Berkeley) ; Ferracin, P (CERN) ; Ghosh, A K (Brookhaven) ; Izquierdo Bermudez, S (CERN) et al.
The US LHC Accelerator Research Program is constructing prototype interaction region quadrupoles as part of the US in-kind contribution to the Hi-Lumi LHC project. The low-beta MQXFA Q1/Q3 coils have a 4-m length and a 150 mm bore. [...]
FERMILAB-PUB-16-346-TD.-
2017 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4003605
Fulltext: PDF; External link: FERMILABPUB
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4003605
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2017-06-22
08:23 |
Statistics of vacuum breakdown in the high-gradient and low-rate regime
/ Wuensch, Walter (CERN) ; Degiovanni, Alberto (CERN) ; Calatroni, Sergio (CERN) ; Korsbäck, Anders (Helsinki Inst. of Phys.) ; Djurabekova, Flyura (Helsinki Inst. of Phys.) ; Rajamäki, Robin (Aalto U.) ; Giner-Navarro, Jorge (Valencia U., IFIC)
In an increasing number of high-gradient linear accelerator applications, accelerating structures must operate with both high surface electric fields and low breakdown rates. Understanding the statistical properties of breakdown occurrence in such a regime is of practical importance for optimizing accelerator conditioning and operation algorithms, as well as of interest for efforts to understand the physical processes which underlie the breakdown phenomenon. [...]
2017 - 11 p.
- Published in : Phys. Rev. Accel. Beams 20 (2017) 011007
Fulltext: PDF;
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2017-06-22
08:23 |
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2017-06-22
08:23 |
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2017-06-21
07:22 |
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2017-06-21
07:22 |
Effect of $Li^+$ ions co-doping on luminescence, scintillation properties and defects characteristics of LuAG:Ce ceramics
/ Liu, Shuping (Shanghai Inst. Ceramics) ; Feng, Xiqi (Shanghai Inst. Ceramics) ; Mares, Jiri A (Prague, Inst. Phys.) ; Babin, Vladimir (Prague, Inst. Phys.) ; Hu, Chen (Shanghai Inst. Ceramics) ; Kou, Huamin (Shanghai Inst. Ceramics) ; D'Ambrosio, Carmelo (CERN) ; Li, Jiang (Shanghai Inst. Ceramics) ; Pan, Yubai (Shanghai Normal U.) ; Nikl, Martin (Prague, Inst. Phys.)
Monovalent $Li^+$ codoped $Lu_3Al_5O_{12}$:Ce (LuAG:Ce) optical ceramics were fabricated by solid state reaction method and further optimized by an air-annealing process. Optical absorption, radioluminescence spectra and scintillation properties such as light yield, scintillation decay times and afterglow were measured and compared with those of the $Li^+$ free LuAG:Ce ceramic and the commercial LuAG:Ce single crystal samples. [...]
2017 - 5 p.
- Published in : Opt. Mater. 64 (2017) 245-249
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2017-06-21
07:22 |
Growth and characterization of Ce-doped YAG and LuAG fibers
/ Djebli, A (ILM, Lyon ; Constantine 1 University, Algeria) ; Boudjada, F (ILM, Lyon ; Constantine 1 University, Algeria) ; Pauwels, K (CERN ; Milan Bicocca U.) ; Kononets, V (ILM, Lyon ; Inst. Scintill. Mat., Kharkiv) ; Patton, G (ILM, Lyon) ; Benaglia, A (CERN ; Princeton U.) ; Lucchini, M (CERN) ; Moretti, F (ILM, Lyon) ; Sidletskiy, O (Milan Bicocca U.) ; Dujardin, C (ILM, Lyon) et al.
Undoped and Ce-doped $Lu_3Al_5O_{12}$ (LuAG) and $Y_3Al_5O_{12}$ (YAG) single crystal fibers were grown by the micro-pulling down technique (μ-PD) with a purpose to fit the design of new dual-readout calorimeter planned to operate in future experiences of high energy physics. Fibers up to 20 cm in length and 1 mm in diameter were grown along [111] direction. [...]
2016 - 3 p.
- Published in : Opt. Mater. 65 (2017) 66-68
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2017-06-21
07:22 |
Effect of reducing $Lu^{3+}$ content on the fabrication and scintillation properties of non-stoichiometric $Lu_{3}−_{x}Al_5O_{12}$:Ce ceramics
/ Liu, Shuping (Shanghai Inst. Ceramics ; Beijing, GUCAS) ; Mares, Jiri A (Prague, Inst. Phys.) ; Babin, Vladimir (Prague, Inst. Phys.) ; Hu, Chen (Shanghai Inst. Ceramics) ; Kou, Huamin (Shanghai Inst. Ceramics) ; D’Ambrosio, Carmelo (CERN) ; Pan, Yubai (Shanghai Normal U.) ; Nikl, Martin (Prague, Inst. Phys.)
$Lu_{3}−_{x}Al_5O_{12}$:Ce optical ceramics ($Lu_3−_{x}AG:Ce,$ x = 1, 2, 3 and 4 at.%, respectively) with $Lu^{3+}$ compositions ranging from 1 to 4 at.% below stoichiometry content were fabricated by solid state reaction method and further optimized by an air-annealing process. The effect of $Lu^{3+}$ deficiency on the optical, luminescence and scintillation properties of such a non-stoichiometric $Lu_3−_{x}Al_5O_{12}$:Ce ceramics was investigated. [...]
2016 - 6 p.
- Published in : Opt. Mater. 63 (2017) 179-184
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2017-06-21
07:22 |
Composition and properties tailoring in $Mg^{2+}$ codoped non-stoichiometric LuAG:Ce,Mg scintillation ceramics
/ Liu, Shuping (Shanghai Inst. Ceramics) ; Mares, Jiri A (Prague, Inst. Phys.) ; Babin, Vladimir (Prague, Inst. Phys.) ; Hu, Chen (Shanghai Inst. Ceramics) ; Kou, Huamin (Shanghai Inst. Ceramics) ; D’Ambrosio, Carmelo (CERN) ; Li, Jiang (Shanghai Inst. Ceramics) ; Pan, Yubai (Shanghai Inst. Ceramics) ; Nikl, Martin (Prague, Inst. Phys.)
A comprehensive study of the optical, radioluminescence and scintillation properties of both the $Lu^{3+}$ rich and $Lu^{3+}$ deficient non-stoichiometric $Lu_{3+x}AG:Ce,Mg$ $(Lu_{3+x}Al_5O_{12}$:Ce,Mg, x = −4, −1, +1 and +4 at.%) ceramics are performed, completed further by the microstructure and defects characterization. Small deviation from the stoichiometric composition as well as $Mg^{2+}$ codoping plays a crucial role in ceramic transparency, radioluminescence intensity and the timing characteristics of scintillation response. [...]
2017 - 6 p.
- Published in : J. Eur. Ceramic Soc. 37 (2017) 1689-1694
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