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Neutron induced radiation damage of plastic scintillators for the upgrade of the Tile Calorimeter of the ATLAS detector.
/ Mdhluli, J E (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Jivan, H (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Erasmus, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Davydov, Yu I (Dubna, JINR) ; Baranov, V (Dubna, JINR) ; Mthembu, S (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mellado, B (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sideras-Haddad, E (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Solovyanov, O (Serpukhov, IHEP) ; Sandrock, C (U. Witwatersrand, Johannesburg, Sch. Phys.) et al.
With the prediction that the plastic scintillators in the gap region of the Tile Calorimeter will sustain a significantly large amount of radiation damage during the HL-LHC run time, the current plastic scintillators will need to be replaced during the phase 2 upgrade in 2018. The scintillators in the gap region were exposed to a radiation environment of up to 10 kGy/year during the first run of data taking and with the luminosity being increased by a factor of 10, the radiation environment will be extremely harsh. [...]
2017 - 7 p.
- Published in : J. Phys.: Conf. Ser. 878 (2017) 012008
In : Kruger2016 - Workshop on Discovery Physics at the LHC, Mpumulanga, South Africa, 4 - 9 Dec 2016, pp.012008
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2.
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Radiation hardness of plastic scintillators for the Tile Calorimeter of the ATLAS detector
/ Jivan, H (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Mellado, B (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sideras-Haddad, E (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Erasmus, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Liao, S (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Madhuku, M (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Peters, G (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Solvyanov, O (CERN)
The radiation damage in polyvinyl toluene based plastic scintillator EJ200 obtained from ELJEN technology was investigated. This forms part of a comparative study conducted to aid in the upgrade of the Tile Calorimeter of the ATLAS detector during which the Gap scintillators will be replaced. [...]
2015 - 7 p.
- Published in : J. Phys.: Conf. Ser. 623 (2015) 012016
IOP Open Access article: PDF;
In : Kruger2014: The International Workshop on Discovery Physics at the LHC, Skukuza, Mpumulanga, South Africa, 1 - 5 Dec 2014, pp.012016
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3.
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Radiation hardness of plastic scintillators for the Tile Calorimeter of the ATLAS detector
/ Jivan, H (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Sideras-Haddad, E (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Erasmus, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Liao, S (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Madhuku, M (iThemba LABS) ; Peters, G (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Sekonya, K (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Solvyanov, O (CERN)
The radiation damage in polyvinyl toluene based plastic scintillator EJ200 obtained from ELJEN technology was investigated. This forms part of a comparative study conducted to aid in the upgrade of the Tile Calorimeter of the ATLAS detector during which the Gap scintillators will be replaced. [...]
2015 - 6 p.
- Published in : J. Phys.: Conf. Ser. 645 (2015) 012019
Fulltext: PDF; IOP Open Access article: PDF;
In : Workshop on High Energy Particle Physics, Johannesburg, South Africa, 11 - 13 Feb 2015, pp.012019
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4.
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Characterization of plastic scintillators using magnetic resonance techniques for the upgrade of the Tile Calorimeter in the ATLAS detector
/ Pelwan, C (Witwatersrand U.) ; Jivan, H (Witwatersrand U.) ; Joubert, D (Witwatersrand U.) ; Keartland, J (Witwatersrand U.) ; Liao, S (Witwatersrand U.) ; Peters, G (Witwatersrand U.) ; Sideras-Haddad, E (Witwatersrand U.)
In this study we look at radiation damage and its adverse effects on plastic scintillators housed within the Tile Calorimeter (TileCal) of the ATLAS detector. The study focuses on determining how the interaction of ionizing radiation with plastic scintillators effects their efficacy and desired properties such as high light output and fast decay time. [...]
2015 - 5 p.
- Published in : J. Phys.: Conf. Ser. 645 (2015) 012023
Fulltext: PDF;
In : Workshop on High Energy Particle Physics, Johannesburg, South Africa, 11 - 13 Feb 2015, pp.012023
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5.
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A comparative study of the radiation hardness of plastic scintillators for the upgrade of the Tile Calorimeter of the ATLAS detector
/ Liao, S (Witwatersrand U.) ; Erasmus, R (Witwatersrand U.) ; Jivan, H (Witwatersrand U.) ; Pelwan, C (Witwatersrand U.) ; Peters, G (Witwatersrand U.) ; Sideras-Haddad, E (Witwatersrand U.)
The influence of radiation on the light transmittance of plastic scintillators was studied experimentally. The high optical transmittance property of plastic scintillators makes them essential in the effective functioning of the Tile calorimeter of the ATLAS detector at CERN. [...]
2015 - 8 p.
- Published in : J. Phys.: Conf. Ser. 645 (2015) 012021
Fulltext: PDF;
In : Workshop on High Energy Particle Physics, Johannesburg, South Africa, 11 - 13 Feb 2015, pp.012021
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6.
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Computing challenges in the certification of ATLAS Tile Calorimeter front-end electronics during maintenance periods
/ Solans, C (CERN) ; Carrio, F (Valencia U., IFIC) ; Kim, H Y (Texas U., Arlington) ; Moreno, P (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Reed, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sandrock, C (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ruan, X (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Shalyugin, A (Dubna, JINR) ; Schettino, V (Juiz de Fora U.) ; Souza, J (Juiz de Fora U.) et al.
After two years of operation of the LHC, the ATLAS Tile calorimeter is undergoing the consolidation process of its front-end electronics. [...]
ATL-TILECAL-PROC-2013-015.
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2014. - 5 p.
Original Communication (restricted to ATLAS) - Full text
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7.
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Comparison of damage effects in plastic scintillators due to irradiation with γ-rays, 190 MeV and 24 GeV protons
/ Dormenev, V (U. Giessen, II. Phys. Inst.) ; Auffray, E (CERN) ; Brinkmann, K T (U. Giessen, II. Phys. Inst.) ; Korjik, M (Minsk, Inst. Nucl. Problems) ; Lucchini, M T (CERN) ; Mechinsky, V (Minsk, Inst. Nucl. Problems) ; Novotny, R W (U. Giessen, II. Phys. Inst.) ; Zaunick, H G (U. Giessen, II. Phys. Inst.)
Plastic scintillation materials play a crucial role in the construction of large area detectors in high energy physics experiments. Future detector concepts for HEP experiments, particularly at collider facilities, will require an unique combination of the material features and of affordable price. [...]
2017 - 3 p.
- Published in : 10.1109/NSSMIC.2016.8069809
In : IEEE Nuclear Science Symposium and Medical Imaging Conference, Strasbourg, France, 29 Oct - 6 Nov 2016, pp.8069809
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8.
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Lattice sites, charge states and spin–lattice relaxation of Fe ions in 57Mn+ implanted GaN and AlN
/ Masenda, H (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Naidoo, D (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Bharuth-Ram, K (DUT, Durban ; iThemba LABS) ; Gunnlaugsson, H P (CERN ; KU Leuven, Dept. Phys. Astron.) ; Johnston, K (CERN) ; Mantovan, R (CNR-IMM Agrate Brianza, Italy) ; Mølholt, T E (CERN) ; Ncube, M (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Shayestehaminzadeh, S (RWTH Aachen U.) ; Gíslason, H P (Iceland U.) et al.
The lattice sites, valence states, resulting magnetic behaviour and spin–lattice relaxation of Fe ions in GaN and AlN were investigated by emission Mössbauer spectroscopy following the implantation of radioactive $^{57}Mn^+$ ions at ISOLDE/CERN. Angle dependent measurements performed at room temperature on the 14.4 keV γ-rays from the 57Fe Mössbauer state (populated from the $^{57}$Mn $β ^−$ decay) reveal that the majority of the Fe ions are in the 2+ valence state nearly substituting the Ga and Al cations, and/or associated with vacancy type defects. [...]
2016 - 9 p.
- Published in : J. Magn. Magn. Mater. 401 (2016) 1130-1138
Fulltext: PDF;
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Atomic-Scale Magnetic Properties of Truly 3d-Diluted ZnO
/ Mantovan, Roberto (IMM-CNR, Agrate Brianza,Italy) ; Gunnlaugsson, Haraldur Páll (Leuven U. ; Aarhus U.) ; Johnston, Karl (CERN) ; Masenda, Hilary (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mølholt, Torben Esmann (Iceland U.) ; Naidoo, Deena (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ncube, Mehluli (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Shayestehaminzadeh, Seyedmohammad (Iceland U.) ; Bharuth-Ram, Krish (DUT, Durban ; iThemba LABS) ; Fanciulli, Marco (IMM-CNR, Agrate Brianza,Italy ; Milan Bicocca U.) et al.
In search for dilute magnetic semiconductors, the magnetic properties at the atomic-scale of Fe atoms incorporated in ZnO, in a concentration range of more than five orders of magnitude from $1 × 10^{−5}$ to 2.2 at% have been probed using emission 57 Fe Mössbauer spectroscopy on implanted $^{57}Mn$ and $^{57}Co$ produced at ISOLDE/CERN. In the ultra-dilute regime ($10 ^{−5}$ at%), the system shows isolated paramagnetic $Fe^{3+}$ ions with a spin–lattice type of relaxation. [...]
2015
- Published in : Advanced Electronic Materials 1 (2015) 1400039
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10.
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Charge states and lattice sites of dilute implanted Sn in ZnO
/ Mølholt, T E (CERN) ; Gunnlaugsson, H P (Leuven U.) ; Johnston, K (CERN) ; Mantovan, R (CNR-IMM Agrate Brianza, Italy) ; Röder, J (CERN ; RWTH Aachen U.) ; Adoons, V (KwaZulu Natal U.) ; Mokhles Gerami, A (CERN ; K.N. Toosi U.) ; Masenda, H (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Matveyev, Y A (Moscow, MIPT) ; Ncube, M (U. Witwatersrand, Johannesburg, Sch. Phys.) et al.
/ISOLDE
The common charge states of Sn are 2+ and 4+. While charge neutrality considerations favour 2+ to be the natural charge state of Sn in ZnO, there are several reports suggesting the 4+ state instead. [...]
2017
- Published in : J. Phys. : Condens. Matter 29 (2017) 155701
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