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2023-03-31
07:09
Radiological characterisation for the clearance of burnable waste produced at CERN / Harbron, Richard (CERN) ; Charousset, Renaud (CERN) ; Dumont, Gerald (CERN) ; Magistris, Matteo (CERN) ; Menaa, Nabil (CERN) ; Giunio Pisano, Paolo (CERN) ; Theis, Christian (CERN)
Burnable waste produced at CERN during upgrading, maintenance and dismantling campaigns may be contaminated with radioactive nuclides produced through activation of accelerator components. Here, we present a methodology for the radiological characterisation of burnable waste, which takes into account the wide range of potential activation conditions (beam energy, material composition, location, irradiation and waiting time). [...]
2023 - 7 p.
Fulltext: PDF;

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2023-03-25
06:30
Experimental setup for Weak Interaction Studies with Radioactive ion-beams WISArD / Atanasov, D (CERN) ; Cresto, F (LPC, Caen) ; Nies, L (CERN) ; Pomorski, M (LP2I, Bordeaux) ; Versteegen, M (LP2I, Bordeaux) ; Alfaurt, P (LP2I, Bordeaux) ; Araujo-Escalona, V (Leuven U.) ; Ascher, P (LP2I, Bordeaux) ; Blank, B (LP2I, Bordeaux) ; Daudin, L (LP2I, Bordeaux) et al.
The article describes the commissioning and technical development of the Weak Interaction Studies with 32Ar Decay (WISArD) experiment, installed at the radioactive ion-beam facility ISOLDE/CERN. The experiment aims to extend the present limits on scalar and tensor currents in the weak interaction and hence search for physics beyond the Standard Model. [...]
2023 - 11 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1050 (2023) 168159 Fulltext: PDF;

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2023-03-25
06:30
Analysis of inhomogeneities in Nb$_{3}$Sn wires by combined SEM and SHPM and their impact on J $_{c}$ and T $_{c}$ / Pfeiffer, S (Vienna, Tech. U. ; CERN) ; Baumgartner, T (Vienna, Tech. U., Atominst.) ; Löffler, S (Vienna, Tech. U.) ; Stöger-Pollach, M (Vienna, Tech. U.) ; Hopkins, S C (CERN) ; Ballarino, A (CERN) ; Eisterer, M (Vienna, Tech. U., Atominst.) ; Bernardi, J (Vienna, Tech. U.)
Abstract We demonstrate the combined use of scanning electron microscopy (SEM) and scanning Hall probe microscopy (SHPM) to analyse inhomogeneities in Nb3Sn wires. Inhomogeneities of the A15 phase in Nb3Sn sub-elements of a Ti-alloyed Restacked Rod Process wire and a Ta-alloyed Powder-In-Tube wire are investigated. [...]
2023 - 11 p. - Published in : Supercond. Sci. Technol. 36 (2023) 045008 Fulltext: PDF;

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2023-03-25
06:30
Safety and reliability assessment of CO$_2$ refrigeration system for underground applications below -50 °C / Barroca, Pierre (CERN) ; Verlaat, Bart (CERN) ; Hafner, Armin (Norwegian U. Sci. Tech.) ; Blust, Stefanie (CERN) ; Hulek, Wojciech (CERN) ; Zwalinski, Lukasz (CERN) ; Teixeira, Daniella (CERN)
A new CO$_2$ refrigeration concept is evaluated to cool the ATLAS and CMS experiments installed close to 100 m underground, at the Large Hadron Collider (LHC) at CERN. The first prototype unit produced to validate the conceptual design and to assess safety and reliability of the system has been commissioned. [...]
2021 - Published in : 10.18462/iir.nh3-co2.2021.0024 External link: Fulltext
In : 9th IIR Conference on Ammonia and CO2 Refrigeration Technologies, Ohrid, North Macedonia, 16 - 17 Sep 2021, pp.30028961

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2023-03-25
06:30
Status and challenges of the interaction region magnets for HL-LHC / Todesco, E (CERN) ; Izquierdo Bermudez, S (CERN) ; Foussat, A (CERN) ; Gautheron, E (CERN) ; Kirby, G (CERN) ; Felice, H (CERN) ; Perez, J C (CERN) ; Fleiter, J (CERN) ; Barth, C (CERN) ; Milanese, A (CERN) et al.
About one hundred magnets of six different types shall be installed in the High Luminosity LHC (HL-LHC) in the years 2026-2028 at CERN. The magnets design, construction and test are based on CERN collaborations with institutes and industrial partners in USA, Spain, Italy, Japan and China. [...]
FERMILAB-PUB-22-861-TD.- 2023 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4001608 Fulltext: PDF; External link: Fermilab Accepted Manuscript

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2023-03-25
06:30
Electromagnetic metamaterials to approach superconductive-like electrical conductivity / Danisi, A (CERN ; Euratom, St. Paul Lez Durance) ; Zannini, C (CERN)
This paper explores the possibility of using electromagnetic metamaterials to synthesize an equivalent structure that approaches superconductive-like properties, i.e. extremely high electrical conductivity. [...]
2023 - 9 p. - Published in : Sci. Rep. 13 (2023) 3236 Fulltext: PDF;

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2023-03-25
06:30
Vacuum chamber conditioning and saturation simulation tool (VacuumCOST): Enabling time-dependent simulations of pressure and NEG sticking in UHV chambers / Henriksen, P L (CERN) ; Ady, M (CERN) ; Kersevan, R (CERN)
Modern particle accelerators, synchrotrons, and other machines requiring UHV frequently make use of NEG coatings to achieve low pressures and resulting high beam stability and lifetime. It is the nature of NEG pumps and coatings, that a limited amount of gas can be pumped before saturation is reached, at which point the NEG must be re-activated to pump efficiently again. [...]
2023 - 5 p. - Published in : Vacuum 212 (2023) 111992 Fulltext: PDF;

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2023-03-25
04:21
Capture of dark matter particles by a galaxy in the case of a bimodal distribution of their velocities / Durrer, Ruth (Geneva U., CAP ; Geneva U., Dept. Theor. Phys.) ; Parnovsky, Serge (Geneva U., CAP ; Geneva U., Dept. Theor. Phys. ; Taras Shevchenko U. ; CERN) ; Parnowski, Aleksei (Natl. Acad. of Sci. of Ukraine)
We have analyzed the rate of capture of dark matter (DM) particles by the galaxy in the case of the existence of two different types of DM or a bimodal velocity distribution function for DM. It is shown that, in addition to the scenario considered in our previous work which is based on the assumption of an unimodal distribution, more complex scenarios are possible in which the transition to the state of intense capture and/or exit from it can occur in two stages. [...]
arXiv:2209.01819.- 2022-09-05 - 6 p. - Published in : LHEP 331 (2023) 1-6 Fulltext: PDF;

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2023-03-25
04:16
Les Houches 2021—physics at TeV colliders: report on the standard model precision wishlist / Huss, Alexander (CERN) ; Huston, Joey (Michigan State U.) ; Jones, Stephen (Durham U., IPPP) ; Pellen, Mathieu (Freiburg U.)
Les Houches activities in 2021 were truncated due to the lack of an in-person component. However, given the rapid progress in the field, and the restart of the LHC, we wanted to continue the bi-yearly tradition of updating the standard model precision wishlist. [...]
arXiv:2207.02122.- 2023-03-16 - 81 p. - Published in : J. Phys. G 50 (2023) 043001 Fulltext: 2207.02122 - PDF; Publication - PDF;

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2023-03-25
04:13
Instrumented baffle for the Advanced Virgo input mode cleaner end mirror / Andrés-Carcasona, M. (Barcelona, IFAE) ; Ballester, O. (Barcelona, IFAE) ; Blanch, O. (Barcelona, IFAE) ; Campos, J. (Madrid, Inst. Optica) ; Caneva, G. (Barcelona, IFAE) ; Cardiel, L. (Barcelona, IFAE) ; Cavalli-Sforza, M. (Barcelona, IFAE) ; Chiggiato, P. (CERN) ; Chiummo, A. (EGO, Pisa) ; Ferreira, J.A. (CERN) et al.
A novel instrumented baffle surrounding the suspended end mirror in the input mode cleaner cavity of the Virgo interferometer was installed in spring 2021. Since then, the device has been regularly operated in the experiment and the obtained results indicate a good agreement with simulations of the stray light inside the optical cavity. [...]
arXiv:2210.16313.- 2023-03-08 - 13 p. - Published in : Phys. Rev. D 107 (2023) 062001 Fulltext: PDF;

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