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2021-06-13
04:01
Discriminating same-mass Neutron Stars and Black Holes gravitational wave-forms / Coupechoux, J.-F. ; Arbey, A. ; Chierici, R. ; Hansen, H. ; Margueron, J. ; Sordini, V.
Gravitational wave-forms from coalescences of binary black hole systems and binary neutron star systems with low tidal effects can hardly be distinguished if the two systems have similar masses. [...]
CERN-TH-2021-088 ; arXiv:2106.05805. - 18 p.
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2021-06-13
04:00
Sterile Neutrinos / Dasgupta, Basudeb (Tata Inst.) ; Kopp, Joachim (CERN ; Mainz U.)
Neutrinos, being the only fermions in the Standard Model of Particle Physics that do not possess electromagnetic or color charges, have the unique opportunity to communicate with fermions outside the Standard Model through mass mixing. [...]
arXiv:2106.05913. -
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2021-06-13
04:00
Using CMS Open Data in research -- challenges and directions / Lassila-Perini, Kati (Helsinki Inst. of Phys.) ; Lange, Clemens (CERN) ; Jarrin, Edgar Carrera (San Francisco de Quito U.) ; Bellis, Matthew (Siena U. ; Pisa U.)
The CMS experiment at CERN has released research-quality data from particle collisions at the LHC since 2014. [...]
arXiv:2106.05726. - 12 p.
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2021-06-13
04:00
Radiation-induced effects in glass windows for optical readout GEM-based detectors / Oliveira, A. Maia (CERN ; Bern U., LHEP) ; Braccini, S. (Bern U., LHEP) ; Casolaro, P. (Bern U., LHEP) ; Heracleous, N. (CERN) ; Leidner, J. (CERN) ; Mateu, I. (Bern U., LHEP) ; Murtas, F. (CERN ; Frascati) ; Silari, M. (CERN)
In this paper we present irradiation measurements performed to select a transparent anode substrate that best meets the requirements of an optical readout for a novel detector, the LaGEMPix. [...]
arXiv:2106.04645. - 13 p.
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2021-06-13
04:00
Probing ALPs at the CERN Gamma Factory / Balkin, Reuven (Technion) ; Krasny, Mieczyslaw W. (Paris U., VI-VII ; CERN) ; Ma, Teng (Technion) ; Safdi, Benjamin R. (UC, Berkeley ; LBNL, Berkeley) ; Soreq, Yotam (Technion)
The aim of the proposed CERN Gamma Factory is to produce $\sim 10^{17}$ photons per second with energies up to 400 MeV. [...]
arXiv:2105.15072. - 12 p.
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2021-06-13
04:00
Charge-state distributions of highly charged lead ions at relativistic collision energies / Kröger, F.M. (Jena U. ; Helmholtz Inst., Jena ; Darmstadt, GSI) ; Weber, G. (Helmholtz Inst., Jena ; Darmstadt, GSI) ; Hirlaender, S. (U. Salzburg (main)) ; Alemany-Fernandez, R. (CERN) ; Krasny, M.W. (CERN ; Paris U., VI-VII) ; Stöhlker, Th. (Jena U. ; Helmholtz Inst., Jena ; Darmstadt, GSI) ; Tolstikhina, I.Yu. (LPI, Moscow (main)) ; Shevelko, V.P. (LPI, Moscow (main))
Presented is a study of the charge-state evolution of relativistic lead ions passing through a thin aluminum stripper foil. [...]
arXiv:2105.13643. -
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2021-06-12
06:33
LLAMA: The Low Level Abstraction For Memory Access / Gruber, Bernhard Manfred (CERN ; Dresden, Tech. U.) ; Amadio, Guilherme (CERN) ; Blomer, Jakob (CERN) ; Matthes, Alexander (HZDR, Dresden) ; Widera, René (HZDR, Dresden) ; Bussmann, Michael (HZDR, Dresden)
The performance gap between CPU and memory widens continuously. [...]
arXiv:2106.04284. - 2021. - 32 p.
00011 Throughput comparison of several copy implementations between different mappings. The particle record dimension consists of 7 \lstinline{float}s. The event record dimension consists of the first 100 \lstinline{int32}s, \lstinline{int64}s, \lstinline{float}s, \lstinline{byte}s and \lstinline{bool}s as they occur in an internal event dataset from the CMS detector at CERN (cf. the example on LLAMA's GitHub repository for the full definition). The (p) versions are parallel. The (r) versions read contiguously, whereas the (w) versions write contiguously. For the field-wise naive and \lstinline{std::copy}, the throughput depends a lot on the field types of the record dimension. The \lstinline{aosoa_copy} outperforms both of them in most cases, single- and multithreaded. - 00009 Throughput comparison of several copy implementations between different mappings. The particle record dimension consists of 7 \lstinline{float}s. The event record dimension consists of the first 100 \lstinline{int32}s, \lstinline{int64}s, \lstinline{float}s, \lstinline{byte}s and \lstinline{bool}s as they occur in an internal event dataset from the CMS detector at CERN (cf. the example on LLAMA's GitHub repository for the full definition). The (p) versions are parallel. The (r) versions read contiguously, whereas the (w) versions write contiguously. For the field-wise naive and \lstinline{std::copy}, the throughput depends a lot on the field types of the record dimension. The \lstinline{aosoa_copy} outperforms both of them in most cases, single- and multithreaded. - 00010 Throughput comparison of several copy implementations between different mappings. The particle record dimension consists of 7 \lstinline{float}s. The event record dimension consists of the first 100 \lstinline{int32}s, \lstinline{int64}s, \lstinline{float}s, \lstinline{byte}s and \lstinline{bool}s as they occur in an internal event dataset from the CMS detector at CERN (cf. the example on LLAMA's GitHub repository for the full definition). The (p) versions are parallel. The (r) versions read contiguously, whereas the (w) versions write contiguously. For the field-wise naive and \lstinline{std::copy}, the throughput depends a lot on the field types of the record dimension. The \lstinline{aosoa_copy} outperforms both of them in most cases, single- and multithreaded. - 00008 Throughput comparison of several copy implementations between different mappings. The particle record dimension consists of 7 \lstinline{float}s. The event record dimension consists of the first 100 \lstinline{int32}s, \lstinline{int64}s, \lstinline{float}s, \lstinline{byte}s and \lstinline{bool}s as they occur in an internal event dataset from the CMS detector at CERN (cf. the example on LLAMA's GitHub repository for the full definition). The (p) versions are parallel. The (r) versions read contiguously, whereas the (w) versions write contiguously. For the field-wise naive and \lstinline{std::copy}, the throughput depends a lot on the field types of the record dimension. The \lstinline{aosoa_copy} outperforms both of them in most cases, single- and multithreaded. - 00000 Conceptual overview of LLAMA. - 00001 Overview of the C++ library components of LLAMA. - 00007 : Caption not extracted - 00004 : Move with 256Mi particles - 00005 : Caption not extracted - 00002 Concept of LLAMA mappings. A mapping defines how a record and array dimension index tuple is translated into a blob number and offset. - 00006 : Move with 256Mi particles - 00003 : Caption not extracted - Fulltext

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2021-06-12
06:33
Monte Carlo Simulation of the Siemens Biograph Vision PET With Extended Axial Field of View Using Sparse Detector Module Rings Configuration / Zein, Sara A ; Karakatsanis, Nicolas A ; Conti, Maurizio ; Nehmeh, Sadek A
We report on the NEMA-NU2-2012 performance of a hypothetical Monte Carlo (MC) model, Ex-PET, of the Siemens Biograph Vision positron emission tomography (PET)/CT (Bio-Vis) with sparse detector module rings and extended axial field of view (AFOV). [...]
2021. - 12 p.
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2021-06-12
06:33
Direct Digitization and ADC Parameter Trade-off for Bunch-by-Bunch Signal Processing / Degl'Innocenti, Irene (Pisa U. ; CERN) ; Boccardi, Andrea (CERN) ; Fanucci, Luca (Pisa U.) ; Wendt, Manfred (CERN)
With the technology improvements of analog-to-digital converters in terms of sampling rate and achievable resolution, direct digitization of beam signals is of growing interest in the field of beam diagnostics. [...]
2020. - 7 p.
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2021-06-12
06:33
Recent Progress on the Commissioning of a Gas Curtain Beam Profile Monitor Using Beam Induced Fluorescence for High Luminosity LHC / Mazzoni, Stefano (CERN) ; Ady, Marton (CERN) ; Forck, Peter (Darmstadt, GSI) ; Jones, Owain Rhodri (CERN) ; Kumar, Narender (Cockcroft Inst. Accel. Sci. Tech. ; U. Liverpool (main)) ; Papazoglou, Ioannis (CERN) ; Pasquino, Chiara (CERN) ; Rossi, Adriana (CERN) ; Sadovich, Sergey (CERN) ; Salehilashkajani, Amir (Cockcroft Inst. Accel. Sci. Tech. ; U. Liverpool (main)) et al.
For the high-luminosity upgrade of the Large Hadron Collider, active control of proton/ion beam halo will be essential for safe and reliable operation [...]
2020. - 5 p.
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