CERN Accelerating science

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2020-02-26
07:41
Noninvasive bunch length measurements exploiting Cherenkov diffraction radiation / Curcio, A (CERN) ; Bergamaschi, M (CERN) ; Corsini, R (CERN) ; Farabolini, W (CERN) ; Gamba, D (CERN) ; Garolfi, L (CERN) ; Kieffer, R (CERN) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) ; Fedorov, K (JAI, UK ; Tomsk Polytechnic U.) et al.
We present the observation and the detailed investigation of coherent Cherenkov diffraction radiation (CChDR) in terms of spectral-angular characteristics. Electromagnetic simulations have been performed to optimize the design of a prismatic dielectric radiator and the performance of a detection system with the aim of providing longitudinal beam diagnostics. [...]
2020 - 13 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 022802 Fulltext: PDF;

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2020-02-26
07:41
Optics interlock system for the CERN LHC: Implementation and operational experience / Schaumann, M (CERN) ; Calia, A (CERN) ; Fuchsberger, K (CERN) ; Galilée, M A (CERN) ; Hemelsoet, G H (CERN) ; Hostettler, M (CERN) ; Jacquet, D (CERN) ; Makai, J (CERN) ; Wenninger, J (CERN)
In 2016 the luminosity reach of the Large Hadron Collider (LHC) was increased by reducing the β-function in the main collision points below the design value to β*=40  cm. This was possible thanks to a specially matched betatron phase advance between the extraction kickers and some sensitive machine elements that would otherwise risk to be damaged by miskicked beam in case of an asynchronous beam dump. [...]
2020 - 12 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 022801 Fulltext: PDF;

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2020-02-26
07:41
Recent Results From Beam Tests of the ALPIDE Pixel Chip for the Upgrade of the ALICE Inner Tracker / Kushpil, S (Rez, Nucl. Phys. Inst.) ; Krizek, F (Rez, Nucl. Phys. Inst.) ; Isakov, A (Rez, Nucl. Phys. Inst.)
The planned upgrade of the A Large Ion Collider Experiment (ALICE) inner tracking system (ITS) aims at improving the ALICE performance in terms of spatial resolution and data rate readout. The new ITS will be a low-material-budget, high-granularity detector. [...]
2019 - 5 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 2319-2323

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2020-02-26
04:56
Trigger strategy for displaced muon pairs following the CMS phase II upgrades / Gershtein, Yuri (Rutgers U., Piscataway) ; Knapen, Simon (Princeton, Inst. Advanced Study)
We show that the phase II upgrade of the CMS tracking detector could enable the experiment to trigger on very low mass $\mathcal{O}(1\,\text{GeV})$ displaced muon pairs with minimal $p_T$ cuts. As a result, CMS can be competitive with LHCb when searching for low mass displaced exotics originating from heavy flavor decays. [...]
arXiv:1907.00007.- 2020-02-13 - 7 p. - Published in : Phys. Rev. D 101 (2020) 032003 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-02-25
06:57
Study of a data analysis method for the angle resolving silicon telescope / Žugec, P. (Zagreb U., Phys. Dept.) ; Barbagallo, M. (INFN, Bari ; CERN) ; Andrzejewski, J. (Lodz U.) ; Perkowski, J. (Lodz U.) ; Colonna, N. (INFN, Bari) ; Bosnar, D. (Zagreb U., Phys. Dept.) ; Gawlik, A. (Lodz U.) ; Sabaté-Gilarte, M. (CERN ; Seville U.) ; Bacak, M. (CERN ; TU Vienna) ; Mingrone, F. (CERN) et al.
A new data analysis method is developed for the angle resolving silicon telescope introduced at the neutron time of flight facility n_TOF at CERN. The telescope has already been used in measurements of several neutron induced reactions with charged particles in the exit channel. [...]
arXiv:2002.09031.- 2020-02-12 - 24 p. - Published in : JINST 15 (2020) P02011 Fulltext: 2002.09031 - PDF; 10.1088_1748-0221_15_02_P02011 - PDF;

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2020-02-25
06:57
Novel low resistivity glass: MRPC detectors for ultra high rate applications / Liu, Z (CERN ; World Lab., Geneva) ; Beyer, R (HZDR, Dresden) ; Dreyer, J (HZDR, Dresden) ; Fan, X (HZDR, Dresden) ; Greifenhagen, R (HZDR, Dresden) ; Kim, D W (Gangneung-Wonju Natl. U.) ; Kotte, R (HZDR, Dresden) ; Garcia, A Laso (HZDR, Dresden) ; Naumann, L (HZDR, Dresden) ; Römer, K (HZDR, Dresden) et al.
Multigap Resistive Plate Chambers (MRPCs) are often used as time-of-flight (TOF) detectors for high-energy physics and nuclear experiments thanks to their excellent time accuracy. For the Compressed Baryonic Matter (CBM) TOF system, MRPCs are required to work at particle fluxes on the order of 1–10 kHz/$cm^2$ for the outer region and 10–25 kHz/$cm^2$ for the central region. [...]
2020 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 959 (2020) 163483

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2020-02-25
06:57
Residual activation of the SPES Front-End system: a comparative study between the MCNPX and FLUKA codes / Donzella, Antonietta (U. Brescia ; INFN, Pavia) ; Ferrari, Matteo (Brescia U. ; INFN, Pavia ; CERN) ; Zenoni, Aldo (Brescia U. ; INFN, Pavia) ; Paderno, Diego (Brescia U.) ; Bodini, Ileana (Brescia U.) ; Villa, Valerio (Brescia U.) ; Ballan, Michele (INFN, Legnaro) ; Centofante, Lisa (Brescia U. ; INFN, Legnaro) ; Monetti, Alberto (INFN, Legnaro) ; Petrovich, Carlo (ENEA, Bologna) et al.
A study of the residual activation of the Front-End system structure of the SPES (Selective Production of Exotic Species) facility, currently under construction at the Legnaro National Laboratories of INFN, Italy, is performed. The study provides useful information for the planning of inspections, maintenance operations and decommissioning of the facility as well as for the assessment of radiological conditions and safety requirements in the design and operation of any accelerator-driven radioactive ion beam facility. [...]
2020 - 13 p. - Published in : Eur. Phys. J. A 56 (2020) 54

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2020-02-25
06:57
Isospin Properties of Nuclear Pair Correlations From the Level Structure of the Self-Conjugate Nucleus $^{88}$Ru / Cederwall, B (Royal Inst. Tech., Stockholm) ; Liu, X (Royal Inst. Tech., Stockholm) ; Aktas, Ö (Royal Inst. Tech., Stockholm) ; Ertoprak, A (Royal Inst. Tech., Stockholm ; Istanbul U.) ; Zhang, W (Royal Inst. Tech., Stockholm) ; Qi, C (Royal Inst. Tech., Stockholm) ; Clément, E (GANIL) ; de France, G (GANIL) ; Ralet, D (CSNSM, Orsay) ; Gadea, A (Valencia U., IFIC) et al.
The low-lying energy spectrum of the extremely neutron-deficient self-conjugate ($N$=Z) nuclide $^{88}_{44}$Ru$_{44}$ has been measured using the combination of the Advanced Gamma Tracking Array (AGATA) spectrometer, the NEDA and Neutron Wall neutron detector arrays, and the DIAMANT charged particle detector array. Excited states in $^{88}$Ru were populated via the $^{54}$Fe($^{36}$Ar,2n$γ$)$^{88}$Ru* fusion-evaporation reaction at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator complex. [...]
2020 - 6 p. - Published in : Phys. Rev. Lett. 124 (2020) 062501 Fulltext from Publisher: PDF;

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2020-02-25
06:57
Lead evaporation instabilities and failure mechanisms of the micro oven at the GTS-LHC ECR ion source at CERN / Kövener, T (CERN ; U. Hamburg (main)) ; Küchler, D (CERN) ; Toivanen, V A (Jyvaskyla U.)
The GTS-LHC ECR ion source (named after the Grenoble Test Source and the Large Hadron Collider) at CERN provides heavy ion beams for the chain of accelerators from Linac3 up to the LHC for high energy collision experiments and to the Super Proton Synchrotron for fixed target experiments. During the standard operation, the oven technique is used to evaporate lead into the source plasma to produce multiple charged lead ion beams. [...]
2020 - 5 p. - Published in : Rev. Sci. Instrum. 91 (2020) 013320

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2020-02-25
06:57
Introducing Timepix2, a frame-based pixel detector readout ASIC measuring energy deposition and arrival time / Wong, W S ; Alozy, J (CERN) ; Ballabriga, R (CERN) ; Campbell, M (CERN) ; Kremastiotis, I (CERN) ; Llopart, X (CERN) ; Poikela, T (CERN) ; Sriskaran, V (CERN) ; Tlustos, L (CERN ; Freiburg U. ; U. Houston (main)) ; Turecek, D (U. Houston (main) ; Unlisted, CZ ; Charles U., Prague (main))
The Timepix2 ASIC (application-specific integrated circuit) is the upgraded successor to the Timepix [1] hybrid pixel detector readout chip. Like the original, Timepix2 contains a matrix of 65k square pixels of 55 μm pitch that can be coupled to a similarly segmented semiconductor sensor, or integrated in an ionising gas detector. [...]
2020 - 8 p. - Published in : Radiat. Meas. 131 (2020) 106230 Fulltext: PDF;

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