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2020-08-14
06:51
Attenuation length of high energy neutrons through a thick concrete shield measured by activation detectors at CHARM / Nakao, Noriaki (Shimizu, Tokyo) ; Sanami, Toshiya (KEK, Tsukuba) ; Kajimoto, Tsuyoshi (Hiroshima U. (main)) ; Iliopoulou, Elpida (CERN) ; Froeschl, Robert (CERN) ; Brugger, Markus (CERN) ; Roesler, Stefan (CERN) ; Infantino, Angelo (CERN)
A deep-penetration shielding experiment was performed at the CERN High-energy AcceleRator Mixed-field (CHARM) facility. The protons (24 GeV/c) were injected into a 50-cm-thick copper target and the released neutrons were transmitted through a bulk concrete shield located vertically upward from the target, where they were measured with bismuth and aluminum activation detectors placed at various penetration distances in the shield. [...]
2020 - 13 p. - Published in : J. Nucl. Sci. Tech. 57 (2020) 1022-1034

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2020-08-14
06:51
The CERN-EU high-energy Reference Field (CERF) facility: New FLUKA reference values of spectral fluences, present and newly proposed operational quantities / Pozzi, F (CERN) ; Silari, M (CERN)
The CERN-EU high-energy Reference Field (CERF) facility provides an almost unique high-energy workplace radiation field for calibrating and testing radiation protection instrumentation employed at high-energy accelerators and for aircraft and space dosimetry. For the available exposure locations, this work provides the particle fluences of the various components of the radiation field, and a new set of reference values for the currently used operational quantities, i.e. [...]
2020 - 16 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 979 (2020) 164477

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2020-08-14
06:51
Monolithic CMOS sensors for sub-nanosecond timing / Kugathasan, Thanushan (CERN) ; Ando, Taeko (Ritsumeikan U.) ; Dannheim, Dominik (CERN) ; Etoh, Takeharu Goji (Ritsumeikan U.) ; Munker, Magdalena (CERN) ; Pernegger, Heinz (CERN) ; Rivetti, Angelo (INFN, Turin) ; Shimonomura, Kazuhiro (Ritsumeikan U.) ; Snoeys, Walter (CERN)
In the ATTRACT project FASTPIX we investigate monolithic pixel sensors with small collection electrodes in CMOS technologies for fast signal collection and precise timing in the sub-nanosecond range. Deep submicron CMOS technologies allow tiny, sub-femtofarad collection electrodes, and large signal-to-noise ratios, essential for very precise timing. [...]
2020 - 12 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 979 (2020) 164461
In : 12th international "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors, Hiroshima, Japan, 14 - 18 Dec 2019, pp.164461

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2020-08-14
06:51
The Phase-2 Upgrade of the CMS Outer Tracker / Roy Chowdhury, Suvankar (Pisa, Scuola Normale Superiore ; INFN, Pisa) /CMS Collaboration
The Large Hadron Collider (LHC), at CERN will undergo major upgrades to be able to deliver peak instantaneous luminosities of about $5−7.5×10^{34}cm^{−2}s^{−1}$ by 2027. This High Luminosity upgrade of the LHC (HL-LHC) is expected to deliver a total of about 3000−4000fb${−1}$ during ten years of operation. [...]
2020 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 979 (2020) 164432
In : 12th international "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors, Hiroshima, Japan, 14 - 18 Dec 2019, pp.164432

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2020-08-14
06:51
Space charge induced losses in the CERN injector complex / Bartosik, H (CERN) ; Asvesta, F (CERN) ; Huschauer, A (CERN) ; Papaphilippou, Y (CERN) ; Schmidt, F (CERN)
Space charge effects in high intensity and high brightness synchrotrons can lead to undesired beam emittance growth, beam halo formation and particle loss. A series of dedicated machine experiments has been performed over the past decade in order to study these effects in the particular regime of long-term beam storage as required for certain applications. [...]
2020 - 12 p. - Published in : JINST 15 (2020) P07021 Fulltext: PDF;

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2020-08-14
06:51
Commissioning of the upgraded ALICE Inner Tracking System / Kushpil, Svetlana (Rez, Nucl. Phys. Inst.) /ALICE Collaboration
The ALICE Inner Tracking System (ITS) detector is undergoing a major upgrade in order to cope with the increased data rates and to meet the requirements as set out by the physics goals of the experiment after the LHC Long Shutdown 2 (LS2). The new ITS will be completely made up of monolithic active pixel sensors (MAPS), called ALPIDE, based on the CMOS 180 nm process. [...]
2020 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 979 (2020) 164421
In : 12th international "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors, Hiroshima, Japan, 14 - 18 Dec 2019, pp.164421

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2020-08-14
06:51
Minimum thickness of carbon coating for multipacting suppression / Angelucci, M (LNF, Dafne Light) ; Novelli, A (LNF, Dafne Light ; U. Rome La Sapienza (main)) ; Spallino, L (LNF, Dafne Light) ; Liedl, A (LNF, Dafne Light) ; Larciprete, R (ISC, Rome ; LNF, Dafne Light) ; Cimino, R (LNF, Dafne Light ; CERN)
We performed a combined secondary electron yield and x-ray photoelectron spectroscopy study on a prototypical system formed by increasing coverages of amorphous carbon (a-C) deposited on atomically clean Cu. A remarkably thin a-C layer, of about 6–8 nm, is surprisingly enough to lower below 1 the secondary emission yield of the whole system. [...]
2020 - 5 p. - Published in : Phys. Rev. Res. 2 (2020) 032030 Fulltext from publisher: PDF;

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2020-08-14
06:51
Diamond Detectors for Timing Measurements in High Energy Physics / Bossini, Edoardo (CERN) ; Minafra, Nicola (Kansas U.)
Timing detectors are a well established part of High Energy Physics experimental instrumentation. The choice of sensors with fast (less than 10 ns) and precise (better than 100 ps) signals is an essential part of the design of a timing detector, together with radiation resistance considerations. [...]
2020 - Published in : Front. Phys. 8 (2020) 248

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2020-08-14
06:51
Serial powering in four-chip prototype RD53A modules for Phase 2 upgrade of the CMS pixel detector / Perovic, Vasilije (Zurich, ETH) /CMS Tracker Group Collaboration
Serial powering is the baseline choice for the upgrade of the CMS pixel detector for the High Luminosity LHC. The first results with the four-chip prototype pixel detector modules based on the demonstrator 65 nm CMOS technology RD53A chip are presented. [...]
2020 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 978 (2020) 164436
In : 12th international "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors, Hiroshima, Japan, 14 - 18 Dec 2019, pp.164436

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2020-08-13
06:55
Status of the NA62 Experiment / Piccini, M (INFN, Perugia) /NA62 Collaboration
The decay , with a very precisely predicted branching ratio of less than 10−10 in the Standard Model framework, is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of such decay with a decay-in-flight technique, novel for this channel. [...]
2020 - 5 p. - Published in : EPJ Web Conf. 234 (2020) 01012
In : Workshop on "Flavour changing and conserving processes" 2019, Capri, Italy, 29 - 31 Aug 2019, pp.01012

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