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Photoelectric charging and lofting of dust particles on a conducting surface with external electric fields
/ Taylor, Kelyan (U. Colorado, Boulder) ; Elliott, Amanda (Rochester U.) ; Wang, Xu (U. Colorado, Boulder) ; Horanyi, Mihaly (U. Colorado, Boulder) ; Schmidt, Rudiger (Darmstadt, Tech. U.) ; Wollmann, Daniel (CERN) ; Wiesner, Christoph (CERN) ; Belanger, Philippe (TRIUMF)
We present a laboratory study of photoelectric charging of dust particles and their lofting on a conducting surface in the presence of external electric fields. Insulating particles with diameter <45 μm are dispersed on a conducting surface exposed to ultraviolet (UV) light. [...]
2024 - 6 p.
- Published in : Phys. Plasmas 31 (2024) 073703
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Electrostatic dust lofting: a possible cause for beam losses at CERN’s LHC
/ Elliott, A (Florida Inst. Tech.) ; Wang, X (U. Colorado, Boulder) ; Horanyi, M (U. Colorado, Boulder) ; Taylor, K (U. Colorado, Boulder) ; Schmidt, R (Darmstadt, Tech. Hochsch.) ; Wiesner, C (CERN) ; Wollmann, D (CERN) ; Belanger, P (TRIUMF)
Dust particles interacting with the proton beams have caused many thousand beam-loss events at CERN's Large Hadron Collider (LHC), some of which led to premature beam dumps and even magnet quenches. It has been hypothesized that dust particles on the vacuum chamber wall of the LHC are negatively charged due to electron clouds and can detach from the chamber wall by the electric field of the beam. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPA065
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPA065
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3.
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The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source
/ Finkenzeller, Henning (Colorado U. ; Colorado U., CIRES) ; Iyer, Siddharth (Tampere U. of Tech.) ; He, Xu-Cheng (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Koenig, Theodore K (Colorado U. ; Colorado U., CIRES ; Peking U., Beijing) ; Lee, Christopher F (Colorado U. ; Colorado U., CIRES) ; Valiev, Rashid (Helsinki U.) ; Hofbauer, Victoria (Carnegie Mellon U.) ; Amorim, Antonio (Lisbon U.) ; Baalbaki, Rima (Helsinki U.) et al.
AbstractIodine is a reactive trace element in atmospheric chemistry that destroys ozone and nucleates particles. Iodine emissions have tripled since 1950 and are projected to keep increasing with rising O3 surface concentrations. [...]
2022 - 7 p.
- Published in : Nature Chem. 15 (2022) 129-135
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The Forward TPC system of the NA61/SHINE experiment at CERN: a tandem TPC concept
/ Rumberger, Brant (U. Colorado, Boulder) ; Aduszkiewicz, Antoni (Warsaw U.) ; Boissevain, Jan (U. Colorado, Boulder) ; Kuich, Magdalena (Warsaw U.) ; László, András (Wigner RCP, Budapest) ; Nagai, Yoshikazu (U. Colorado, Boulder) ; Oláh, László (Wigner RCP, Budapest) ; Podlaski, Piotr (Warsaw U.) ; Varga, Dezső (Wigner RCP, Budapest) ; Wensveen, Martin (CERN) et al.
This paper presents the Forward Time Projection Chamber (FTPC) system of the NA61/SHINE experiment at the CERN SPS accelerator. This TPC system applies a novel tandem-TPC design to reduce the background originating from particle tracks not synchronous with the event trigger. [...]
arXiv:2004.11358.-
2020-07-17 - 14 p.
- Published in : JINST 15 (2020) P07013
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5.
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Workshop on Dust Charging and Beam-Dust Interaction in Particle Accelerators
/ Blaszkiewicz, Milosz Robert (CERN) ; Felsberger, Lukas (CERN) ; Hernalsteens, Cedric (CERN) ; Heron, Jack (CERN) ; Obermair, Christoph (Graz University of Technology (AT)) ; Rosaz, Guillaume Jonathan (CERN) ; Schmidt, Rudiger (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) ; Uythoven, Jan (CERN) ; Wiesner, Christoph (CERN) ; Wollmann, Daniel (CERN) et al.
The effects of beam-dust interactions have been observed in particle accelerators and have been studied as early as the 1960s. [...]
CERN-ACC-NOTE-2023-0025.
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2023.
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6.
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Study of ππ elastic scattering using the chew-low extrapolation method
/ Marateck, S (Univ. of Pennsylvania, Philadelphia, USA) ; Hagopian, V (Univ. of Pennsylvania, Philadelphia, USA) ; Selove, W (Univ. of Pennsylvania, Philadelphia, USA) ; Jacobs, L (Univ. of California, Berkeley, USA ; CERN) ; Oppenheimer, F (Univ. of Colorado, Boulder, USA) ; Schultz, W (Univ. of Colorado, Boulder, USA) ; Gutay, L J (Purdue Univ., Indiana, USA) ; Miller, D H (Purdue Univ., Indiana, USA) ; Prentice, J (Univ. of Toronto, Ontario, Canada) ; West, E (Univ. of Toronto, Ontario, Canada) et al.
Geneva : CERN, 1968
- Published in : Phys. Rev. Lett. 21 (1968) 1613-1617
APS Published version, local copy: PDF;
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7.
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Design and Preparation of Two ReBCO-CORC® Cable-In-Conduit Conductors for Fusion and Detector Magnets
/ Mulder, T (Twente U., Enschede ; CERN) ; van der Laan, D (Advanced Conductor Technologies, Boulder ; Colorado U.) ; Weiss, J D (Advanced Conductor Technologies, Boulder ; Colorado U.) ; Dudarev, A (CERN) ; Dhallé, M (Twente U., Enschede) ; ten Kate, H H J (CERN)
Two new ReBCO-CORC® based cable-in-conduit conductors (CICC) are developed by CERN in collaboration with ACT-Boulder. Both conductors feature a critical current of about 80 kA at 4.5 K and 12 T. [...]
2017 - 8 p.
- Published in : IOP Conf. Ser. Mater. Sci. Eng. 279 (2017) 012033
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In : 2017 Cryogenic Engineering Conference and International Cryogenic Materials Conference, Madison, WI, USA, 9 - 13 Jul 2017, pp.012033
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8.
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Determination of the collision rate coefficient between charged iodic acid clusters and iodic acid using the appearance time method
/ He, Xu-Cheng (U. Helsinki (main)) ; Iyer, Siddharth (U. Helsinki (main)) ; Sipilä, Mikko (U. Helsinki (main)) ; Ylisirniö, Arttu (UEF, Kuopio) ; Peltola, Maija (Helsinki U.) ; Kontkanen, Jenni (Helsinki U.) ; Baalbaki, Rima (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Tham, Yee Jun (Helsinki U.) et al.
Ions enhance the formation rate of atmospheric aerosol particles, which play an important role in Earth’s radiative balance. Ion-induced nucleation involves the stepwise accretion of neutral monomers onto a molecular cluster containing an ion, which helps to stabilize the cluster against evaporation. [...]
2020 - 12 p.
- Published in : Aerosol Sci. Technol. 55 (2020) 231-242
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Simulations of Electron Effects in Superconducting Cavities with the VORPAL Code
/ Nieter, Chet (Tech-X, Boulder, Colorado) ; Cary, John R (Tech-X, Boulder, Colorado) ; Messmer, Peter (Tech-X, Boulder, Colorado) ; Smithe, David (Tech-X, Boulder, Colorado) ; Stoltz, Peter (Tech-X, Boulder, Colorado) ; Werner, Gregory (CIPS, Boulder, Colorado)
2006 - 3 p.
External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2269
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10.
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Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors
/ Lehtipalo, Katrianne (U. Helsinki (main) ; PSI, Villigen ; Finnish Meteorological Inst.) ; Yan, Chao (U. Helsinki (main)) ; Dada, Lubna (U. Helsinki (main)) ; Bianchi, Federico (U. Helsinki (main)) ; Xiao, Mao (PSI, Villigen) ; Wagner, Robert (U. Helsinki (main)) ; Stolzenburg, Dominik (Vienna U.) ; Ahonen, Lauri R (U. Helsinki (main)) ; Amorim, Antonio (Lisbon, CENTRA ; Lisbon U.) ; Baccarini, Andrea (PSI, Villigen) et al.
A major fraction of atmospheric aerosol particles, which affect both air quality and climate, form from gaseous precursors in the atmosphere. Highly oxygenated organic molecules (HOMs), formed by oxidation of biogenic volatile organic compounds, are known to participate in particle formation and growth. [...]
2018 - 10 p.
- Published in : Sci. Adv. 4 (2018) eaau5363
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