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2019-08-23
06:34
Chemical Purification of Terbium-155 from Pseudo-Isobaric Impurities in a Mass Separated Source Produced at CERN / Webster, Ben (Teddington, Natl. Phys. Lab ; Surrey U.) ; Ivanov, Peter (Teddington, Natl. Phys. Lab) ; Russell, Ben (Teddington, Natl. Phys. Lab) ; Collins, Sean (Teddington, Natl. Phys. Lab) ; Stora, Thierry (CERN) ; Ramos, Joao Pedro (CERN ; Leuven U.) ; Köster, Ulli (Laue-Langevin Inst.) ; Robinson, Andrew Paul (Teddington, Natl. Phys. Lab ; Manchester U.) ; Read, David (Teddington, Natl. Phys. Lab ; Surrey U.)
Four terbium radioisotopes ($^{149, 152, 155, 161}$Tb) constitute a potential theranostic quartet for cancer treatment but require any derived radiopharmaceutical to be essentially free of impurities. Terbium-155 prepared by proton irradiation and on-line mass separation at the CERN-ISOLDE and CERN-MEDICIS facilities contains radioactive$^{139}$Ce$^{16}$O and also zinc or gold, depending on the catcher foil used. [...]
2019 - Published in : Sci. Rep. 9 (2019) 10884 fulltext from publisher: PDF;

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2019-08-23
06:34
Capture of an external anion beam into a linear Paul trap / Cerchiari, G (CERN) ; Erlewein, S (CERN) ; Yzombard, P (Heidelberg U.) ; Zimmermann, M (Heidelberg U.) ; Kellerbauer, A (Heidelberg, Max Planck Inst.)
We describe a linear Paul trap and high-voltage platform specifically designed for the trapping of a large and pure sample of anions from an external keV-energy beam. Capture and confinement in a static configuration of DC potentials was found to occur by transfer of axial to radial ion momentum due to elastic and inelastic collisions. [...]
2019 - Published in : J. Phys. B 52 (2019) 155003 Fulltext: PDF;

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2019-08-23
06:34
Rapid growth of organic aerosol nanoparticles over a wide tropospheric temperature range / Stolzenburg, Dominik (Vienna U.) ; Fischer, Lukas (Innsbruck U.) ; Vogel, Alexander L (Frankfurt U. ; CERN ; PSI, Villigen) ; Heinritzi, Martin (Frankfurt U.) ; Schervish, Meredith (Carnegie Mellon U.) ; Simon, Mario (Frankfurt U.) ; Wagner, Andrea C (Frankfurt U.) ; Dada, Lubna (Helsinki U.) ; Ahonen, Lauri R (Helsinki U.) ; Amorim, Antonio (Lisbon U. ; CMAF, Lisbon) et al.
Nucleation and growth of aerosol particles from atmospheric vapors constitutes a major source of global cloud condensation nuclei (CCN). The fraction of newly formed particles that reaches CCN sizes is highly sensitive to particle growth rates, especially for particle sizes <10 nm, where coagulation losses to larger aerosol particles are greatest. [...]
2018 - 6 p. - Published in : Proc. Natl. Acad. Sci. U. S. A. 115 (2018) 9122-9127

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2019-08-22
06:55
Stability modeling of the LHC Nb-Ti Rutherford cables subjected to beam losses / Bottura, L (CERN) ; Breschi, M (Bologna U.) ; Felcini, E (CERN) ; Lechner, A (CERN)
The Large Hadron Collider (LHC) at CERN is being prepared for its full energy exploitation during run III, i.e., an increase of the beam energy beyond the present 6.5 TeV, targeting the maximum discovery potential attainable. This requires an increase of the operating field of the superconducting dipole and quadrupole magnets, which in turn will result in more demanding working conditions due to a reduction of the operating margin while the energy deposited by particle loss will increase. [...]
2019 - 10 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 041002 Fulltext from Publisher: PDF;

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2019-08-22
06:55
Noninvasive LHC transverse beam size measurement using inelastic beam-gas interactions / Alexopoulos, A (CERN) ; Barschel, C (CERN) ; Bravin, E (CERN) ; Bregliozzi, G (CERN) ; Chritin, N (CERN) ; Dehning, B (CERN) ; Ferro-Luzzi, M (CERN) ; Giovannozzi, M (CERN) ; Jacobsson, R (CERN) ; Jensen, L (CERN) et al. /BGV
The beam-gas vertex (BGV) detector is an innovative instrument measuring noninvasively the transverse beam size in the Large Hadron Collider (LHC) using reconstructed tracks from beam-gas interactions. The BGV detector was installed in 2016 as part of the R&D; for the High-Luminosity LHC project. [...]
2019 - 15 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 042801 Fulltext from Publisher: PDF;

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2019-08-22
06:55
Development of the SLRI beam test facility for characterization of monolithic active pixel sensors / Kittimanapun, K (Unlisted, TH) ; Chanlek, N (unlisted, TH) ; Klysubun, P (unlisted, TH) ; Kobdaj, C (Suranaree U. of Tech.) ; Lakrathok, A (Suranaree U. of Tech.) ; Laojamnongwong, N (Suranaree U. of Tech.) ; Mager, M (CERN) ; Musa, L (CERN)
Synchrotron Light Research Institute (SLRI) has successfully constructed a new experimental station, a Beam Test Facility (BTF), to the current SLRI accelerator complex. SLRI-BTF is capable of producing electron test beams with the number of electrons ranging from a few to millions of electrons per spill and with tunable energy from 40 MeV up to 1.2 GeV. [...]
2019 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 930 (2019) 105-111

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2019-08-22
05:13
Alternative approach to populate and study the $^{229}$Th nuclear clock isomer / Verlinde, M. (Leuven U.) ; Kraemer, S. (Leuven U.) ; Moens, J. (Leuven U.) ; Chrysalidis, K. (CERN) ; Correia, J.G. (Lisbon, IST) ; Cottenier, S. (U. Gent (main) ; Unlisted, BE) ; De Witte, H. (Leuven U.) ; Fedorov, D.V. (Kurchatov Inst., Moscow) ; Fedosseev, V.N. (CERN) ; Ferrer, R. (Leuven U.) et al.
A new approach to observe the radiative decay of the $^{229}$Th nuclear isomer, and to determine its energy and radiative lifetime, is presented. Situated at a uniquely low excitation energy, this nuclear state might be a key ingredient for the development of a nuclear clock, a nuclear laser and the search for time variations of the fundamental constants. [...]
arXiv:1904.10245.- 2019-08-12 - 10 p. - Published in : Phys. Rev. C 100 (2019) 024315 Fulltext: PDF;

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2019-08-21
06:46
Thermal shock experiment of beryllium exposed to intense high energy proton beam pulses / Ammigan, K (Fermilab) ; Bidhar, S (Fermilab) ; Hurh, P (Fermilab) ; Zwaska, R (Fermilab) ; Butcher, M (CERN) ; Calviani, M (CERN) ; Guinchard, M (CERN) ; Losito, R (CERN) ; Kuksenko, V (Oxford U.) ; Roberts, S (Oxford U.) et al.
Beryllium is a material extensively used in various particle accelerator beam lines and target facilities, as beam windows and, to a lesser extent, as secondary particle production targets. With increasing beam intensities of future multimegawatt accelerator facilities, these components will have to withstand even greater thermal and mechanical loads during operation. [...]
FERMILAB-PUB-18-670-AD.- 2019 - 14 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 044501 Fulltext: PDF; Fulltext from Publisher: PDF; External link: FERMILABPUB

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2019-08-21
06:46
Field Quality of HD3—A Nb$_3$Sn Dipole Magnet Based on Block Design / Wang, Xiaorong (LBL, Berkeley) ; Cheng, Daniel W (LBL, Berkeley) ; Dietderich, Daniel R (LBL, Berkeley) ; DiMarco, Joseph (Fermilab) ; Felice, Hélène (Saclay) ; Ferracin, Paolo (CERN) ; Marchevsky, Maxim (LBL, Berkeley) ; Prestemon, Soren O (LBL, Berkeley) ; Sabbi, Gianluca (LBL, Berkeley)
HD3 is the latest magnet of a series of block-type Nb3Sn dipole model magnets developed by the Superconducting Magnet Program at Lawrence Berkeley National Laboratory. The magnet is 1 m long with a clear aperture of 43 mm. [...]
FERMILAB-PUB-19-402-TD.- 2019 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4002507

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2019-08-21
06:46
Optimization of the CLIC positron source using a start-to-end simulation approach involving multiple simulation codes / Han, Y L (Orsay, LAL) ; Bayar, C (Ankara U.) ; Latina, A (CERN) ; Doebert, S (CERN) ; Schulte, D (CERN) ; Ma, L L (Shandong U.)
A start-to-end optimization simulation toolkit for the CLIC positron source has been developed using multiple simulation codes to model adequately different areas of the positron source. The positron source includes the targets using channeling and pair-production processes, the adiabatic matching device and the pre-injector and injector linacs. [...]
2019 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 928 (2019) 83-88

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