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2022-01-14
06:23
New opportunities in heavy ion physics at HL-LHC with a MIP Timing Detector at the CMS experiment / Oh, Geonhee (Illinois U., Chicago) /CMS Collaboration
The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive Phase II upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). A new timing layer is designed to measure minimum ionizing particles (MIP) with a time resolution of $\sim$ 30 ps and hermetic coverage up to a pseudo-rapidity of $|\eta|$ = 3. [...]
SISSA, 2021 - 5 p. - Published in : PoS HardProbes2020 (2021) 178 Fulltext: PDF; External link: Fulltext
In : 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions : Hard Probes 2020 (HP2020), Austin, Texas, United States, 31 May - 5 June 2020, pp.178

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2022-01-14
06:23
The NA60+ experiment at the CERN SPS: physics goals and prospects / Scomparin, Enrico (INFN, Turin) /NA60+ Collaboration
The region of the QCD phase diagram at high-$\mu_{\rm B}$ can be accessed by fixed-target experiments working at future or existing facilities providing nuclear beams in the multi-GeV energy range. In particular, the CERN SPS is able to provide high-intensity beams over a wide energy interval ($\sqrt{s_{\rm NN}} = 5-17$ GeV) that are ideal for the study of rare signals. [...]
SISSA, 2021 - 5 p. - Published in : PoS HardProbes2020 (2021) 050 Fulltext: PDF; External link: Fulltext
In : 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions : Hard Probes 2020 (HP2020), Austin, Texas, United States, 31 May - 5 June 2020, pp.050

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2022-01-14
04:10
Search for Darkonium in $e^+e^-$ Collisions / BABAR Collaboration
Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existence of dark matter bound states (darkonia) remains to be investigated. [...]
arXiv:2106.08529; BABAR-PUB-21/002; SLAC-PUB-17608.- 2022-01-11 - 10 p. - Published in : Phys. Rev. Lett. 128 (2022) 021802 Fulltext: PDF;

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2022-01-13
06:16
RF system challenges for future  ${e}^+ {e}^-$ circular colliders / Brunner, Olivier (CERN) ; Jensen, Erk (CERN) ; Karpov, Ivan (CERN) ; Montesinos, Eric (CERN) ; Peauger, Franck (CERN) ; Syratchev, Igor (CERN)
The RF system is the centrepiece of any future circular lepton collider. In particular, the system is required to support the high intensity beams needed for pushing the luminosity at the lower energy regimes of future energy-frontier circular lepton colliders (e.g. [...]
2021 - 11 p. - Published in : Eur. Phys. J. Plus 137 (2022) 73 Fulltext: PDF;
In : Focus Point on A Future Higgs & Electroweak Factory (FCC): Challenges towards Discovery, pp.73

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2022-01-13
06:16
General mitigation techniques for coherent beam instabilities in particle accelerators / Métral, Elias (CERN)
An important number of coherent beam instability mechanisms can be observed in a particle accelerator, depending if the latter is linear or circular, operated at low, medium or high energy, with a small or a huge amount of turns (for circular machines), close to transition energy or not (below or above), with only one bunch or many bunches, with counter-rotating beams (such as in colliders) or not, if the beam is positively or negatively charged, if one is interested in the longitudinal plane or in the transverse plane, in the presence of linear coupling between the transverse planes or not, in the presence of nonlinearities or not, in the presence of noise or not, etc. Building a realistic impedance model of a machine is a necessary step to be able to evaluate the machine performance limitations, identify the main contributors in case an impedance reduction is required, and study the interaction with other mechanisms such as optics (linear and nonlinear), RF gymnastics, transverse damper, noise, space charge, electron cloud, and beam–beam (in a collider). [...]
2021 - 23 p. - Published in : Eur. Phys. J. Plus 137 (2022) 47 Fulltext: PDF;

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2022-01-13
06:16
The challenge of monochromatization : Direct s-Channel Higgs Production: $e^+e^- \to H / Faus-Golfe, Angeles (IJCLab, Orsay) ; Valdivia Garcia, Marco Alan (Guanajuato U. ; CERN) ; Zimmermann, Frank (CERN)
The FCC-ee could measure the electron Yukawa coupling in a dedicated run at $\sim $125 GeV collision energy, provided that the center-of-mass (CM) energy spread can be reduced by means of monochromatization, e.g., through introducing nonzero horizontal dispersion of opposite sign at the interaction point (IP), for the two colliding beams. If the IP dispersion is nonzero, beamstrahlung blows up the horizontal emittance, and self-consistent IP parameters need to be determined. [...]
2021 - 9 p. - Published in : Eur. Phys. J. Plus 137 (2022) 31 Fulltext: PDF;
In : Focus Point on A Future Higgs & Electroweak Factory (FCC): Challenges towards Discovery, pp.31

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2022-01-13
06:16
Evaluating POWER Architecture for Distributed Training of Generative Adversarial Networks / Hesam, Ahmad (CERN ; Delft Tech. U.) ; Vallecorsa, Sofia (CERN) ; Khattak, Gulrukh (CERN) ; Carminati, Federico (CERN)
The increased availability of High-Performance Computing resources can enable data scientists to deploy and evaluate data-driven approaches, notably in the field of deep learning, at a rapid pace. As deep neural networks become more complex and are ingesting increasingly larger datasets, it becomes unpractical to perform the training phase on single machine instances due to memory constraints, and extremely long training time. [...]
2019 - 9 p. - Published in : 10.1007/978-3-030-34356-9_32
In : High Performance Computing: ISC High Performance 2019 International Workshops, Frankfurt, Germany, June 16-20, 2019, Revised Selected Papers, Frankfurt, Germany, 16 - 20 Jun 2019, pp.432-440

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2022-01-13
06:16
Evidence against the wobbling nature of low-spin bands in $^{135}$Pr / Lv, B.F. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Petrache, C.M. (IJCLab, Orsay) ; Lawrie, E.A. (iThemba LABS ; Western Cape U.) ; Guo, S. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Astier, A. (IJCLab, Orsay) ; Dupont, E. (IJCLab, Orsay) ; Zheng, K.K. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS ; IJCLab, Orsay) ; Ong, H.J. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Wang, J.G. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Zhou, X.H. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) et al.
The electromagnetic character of the $\Delta I=1$ transitions connecting the one- to zero-phonon and the two- to one-phonon wobbling bands should be dominated by an $E2$ component, due to the collective motion of the entire nuclear charge. In the present work it is shown, based on combined angular correlation and linear polarization measurements, that the mixing ratios of all analyzed connecting transitions between low-lying bands in $^{135}$Pr interpreted as zero-, one-, and two-phonon wobbling bands, have absolute values smaller than one. [...]
arXiv:2106.04879.- 2022-01-10 - 6 p. - Published in : Phys. Lett. B 824 (2022) 136840 Fulltext: 1-s2.0-S0370269321007802-main - PDF; 2106.04879 - PDF;

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2022-01-13
06:16
Numerical Analysis of Resonant Multipolar Instabilities in High Power Klystrons / Cai, Jinchi (Lancaster U.) ; Syratchev, Igor (CERN) ; Burt, Graeme (Lancaster U.)
The monopole monotron instability is a well-known phenomenon in linear beam devices. In recent development of a high-efficiency 50-MW X-band klystron, such instabilities were found and mitigated in a special second-harmonic multicell cavities triplet that is used to improve the klystron's performance. [...]
2021 - 5 p. - Published in : IEEE Trans. Electron Devices 68 (2021) 3617-3621

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2022-01-13
06:16
Producing gold at ISOLDE-CERN / Barzakh, A E (St. Petersburg, INP) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Atanasov, D (Heidelberg, Max Planck Inst.) ; Cubiss, J G (York U., England) ; Harding, R D (York U., England ; CERN) ; Al Monthery, M (York U., England) ; Althubiti, N A (Manchester U. ; Al Jouf U.) ; Andel, B (Comenius U. ; Leuven U.) ; Antalic, S (Comenius U.) ; Ballof, J (CERN ; Mainz U., Inst. Kernchem.) et al.
The yield of 18 ion beams of radioactive gold nuclei produced in the thick uranium target at ISOLDE (CERN) by 1.4-GeV protons was measured. The production-efficiency dependence on the half-life (efficiency curve) was derived using the in-target production calculations by the FLUKA-CERN code. [...]
2022 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 513 (2022) 26-32

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