F. Özok

We investigated the darkening of two high OH- content quartz fibres irradiated with 24 GeV protons at the Cern PS facility IRRAD. The two tested fibres have a 0.6 mm quartz core diameter, one with hard plastic cladding (qp) and the other with quartz cladding (qq). These fibres were exposed at about 1.25 Grad in 3 weeks. The fibres became opaque below 380 nm and in the range 580–650 nm. The darkening under irradiation and damage recovery after irradiation as a function of dose and time are similar to what we observed with electrons. The typical attenuation at 455 nm are 1.44±0.22 and 2.20±0.15dB/m at 100 Mrad for qp and qq fibres, respectively. The maximum damage recovery is also observed near this wavelength.

The Large Hadron Collider (LHC) is going to start taking data with 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">33</sup> cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> s <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> luminosity, and reach the designed value of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">34</sup> cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> s <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> in 2013. The LHC luminosity will continue to improve each year, reaching to 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">35</sup> cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> s <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> in 2023. We call this high luminosity era the Super-LHC (SLHC). Hadronic Endcap (HE) calorimeters of the CMS experiment cover the pseudorapidity range of 1.4 ≪ η ≪ 3 on both sides of the CMS detector, contributing to superior jet and missing transverse energy resolutions. As the integrated luminosity of the LHC increases, the scintillator tiles used in the CMS Hadronic Endcap calorimeter will lose their efficiency. The CMS collaboration plans to substitute Quartz plates for the scintillator tiles of the original design. Various tests have proved Quartz to be radiation hard, but the light produced by Quartz comes from Cerenkov process, which yields drastically fewer photons than scintillation. To increase the light collection efficiency, we propose to treat the Quartz plates with radiation hard wavelength shifters, p-terphenyl or 4% gallium doped zinc oxide. The test beam studies revealed a substantial light collection increase on pTp or ZnO:Ga deposited Quartz plates. We constructed a 20 layer calorimeter prototype with pTp coated plates, and tested the hadronic and the electromagnetic capabilities at the CERN H2 area. Here we report the results of these test beams as well as radiation damage studies performed on p-Terphenyl.

The on-line data monitoring tool developed for the coming ALICE experiment at LHC, CERN is presented. This monitoring tool which is a part of the ALICE-DAQ software framework, written entirely in C++ language, uses standard Linux tools in conjunction with the data display and analysis package ROOT, developed at CERN. It allows checking the consistency and quality of the data and correct functioning of the various sub-detectors either at run time or during off line by playing back the recorded raw data. After discussing the functionality and performance of this package, the experience gained during the test beam periods is also summarized.

We present a conceptual sampling electromagnetic calorimeter based on secondary electron emission process. The secondary electron emission process was implemented in Geant4 as a user physics class, which accurately reproduces the energy spectrum and yield of secondary electrons for thin metals. The simulation results for the response linearity and energy resolution are compared with that of a scintillation calorimeter. The response and energy resolution of the calorimeter were obtained for electron energies up to 50 GeV . The response linearity to electromagnetic showers is to within 1.5%, whereas the energy resolution is σ/E = (44%) GeV1/2/√E for 2.5 cm sampling of iron absorber.

ALICE (A Large Ion Collider Experiment) is the heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma at the CERN Large Hadron Collider (LHC). A flexible, large bandwidth Data Acquisition System (DAQ) has been designed and deployed to collect sufficient statistics in the short running time foreseen per year for heavy ions and to accommodate very different requirements originated from the 18 sub-detectors. The Data Acquisition and Test Environment (DATE) is the software framework handling the data from the detector electronics up to the mass storage. This paper reviews the DAQ software and hardware architecture, including the latest features of the final design, such as the handling of the numerous calibration procedures in a common framework. We also discuss the large scale tests conducted on the real hardware to assess the standalone DAQ performances, its interfaces with the other online systems and the extensive commissioning performed in order to be ready for cosmics data taking scheduled to start in November 2007. The test protocols followed to integrate and validate each sub-detector with DAQ and Trigger hardware synchronized by the Experiment Control System are described. Finally, we give an overview of the experiment logbook, and some operational aspects of the deployment of our computing facilities. The implementation of a Transient Data Storage able to cope with the 1.25 GB/s recorded by the event-building machines and the data quality monitoring framework are covered in separate papers.

In this study, we investigated the impact of chemical etching on the light output and energy resolution of LYSO scintillators using simple, affordable laboratory equipment. We found that etching with phosphoric acid at temperatures between 180 °C and 190 °C improved the light output and energy resolution compared to mechanically polished crystals, even after minimal etching times. Our results show that with 7.5 min of chemical etching, the light output increase rate is 45.7%, and the relative energy resolution improvement is 12%.

We give a prescription how high energy physics tools can be used to perform scalar dark matter analysis. We also present the analysis results of scalar dark matter in the context of 6 dimensional Effective Field Theory.

International Journal of Geometric Methods in Modern PhysicsOnline Ready No AccessScalar dark matter analysis of six-dimensional effective field theoryAyşe Elçi̇boğa Kuday, Ferhat Özok, and Erdinç Ulaş SakaAyşe Elçi̇boğa KudayDepartment of Fundamental Sciences, Turkish Military Academy, National Defence University, 06654, Ankara, TurkeyE-mail Address: [email protected]Corresponding author., Ferhat ÖzokDepartment of Physics, Mimar Sinan Fine Arts University, 34380, İstanbul, TurkeyE-mail Address: [email protected], and Erdinç Ulaş SakaDepartment of Physics, Faculty of Science, İstanbul University 34134, İstanbul, TurkeyE-mail Address: [email protected]https://doi.org/10.1142/S0219887824501172Cited by:0 (Source: Crossref) PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Keywords:Scalar dark mattereffective field theoryrelic densitydirect detectionindirect detectionlhcfcchigh energy colliderdijet Remember to check out the Most Cited Articles! Check out new Mathematical Physics books in our Mathematics 2021 catalogue Featuring authors Bang-Yen Chen, John Baez, Matilde Marcolli and more! FiguresReferencesRelatedDetails Recommended Online Ready Metrics History Received 6 April 2023 Revised 24 November 2023 Accepted 6 December 2023 Published: 12 January 2024 KeywordsScalar dark mattereffective field theoryrelic densitydirect detectionindirect detectionlhcfcchigh energy colliderdijetPDF download

We analyze dark matter in most general form of effective field theory approach. To examine the interactions between the weakly interacting massive particles (WIMPs) and the Standard Model (SM) particles, we use the six-dimensional EFT mediated by new physics scale [Formula: see text] at tree level. After implementing a new effective field theory model in FeynRules [FeynRules 2.0 A complete toolbox for tree-level phenomenology, Comput. Phys. Comm. 185(8) (2014) 2250–2300] We investigate the theory and constrain the theory by using relic density generated by MadDM [MadDM v.3.0: A Comprehensive tool for dark matter studies, Phys. Dark Univ. 24 (2019) 100249] tool of MadGraph5_aMC@NLO [The automated computation of tree-level and next-to-leading order differential cross-sections, and their matching to parton shower simulations, J. High Energy Phys. 79 (2014) 2014].

Due to an expected increase in radiation damage under super-LHC conditions, we propose to substitute the scintillator tiles in the original design of the CMS hadronic endcap (HE) calorimeter with quartz plates. Quartz is proved to be radiation hard by various tests, but the light produced by quartz comes from Cerenkov process, and it is 100 times less than scintillation photons. To enhance the light production we treated the quartz plates with p-Terphenyl, and constructed a 20 layers calorimeter prototype. Here, we report the test beam results for hadronic and electromagnetic capabilities of the calorimeter prototype as well as radiation damage results for p-Terphenyl.

Yüksek Enerji Fiziği alanında temel olarak algıç benzetimleri oluşturmak için kullanılan açık kaynak kodlu bir C/C++ kütüphanesi olan GEANT4 belli bir fiziksel sürecin olay üretimini yapabilme imkanı sağlamaktadır. Bu bildiride, daha düşük enerjilerin söz konusu olduğu Çekirdek Fiziğinde Nötron Buharlaşma tepkimeleri olarak bilinen nadir bir süreç için veri güdümlü yeni GEANT4 sınıfları yazılmıştır. C/C++ dilinde yazılmış bu sınıflar, söz konusu kütüphanede hal-i hazırda tanımlı olan süreç sınıfından türetilmiş olup, etkileşim tesir kesitleri ise ENDF/B-VII (Evaluated Nuclear Data Library) adlı deneysel çekirdek etkileşimlerinin veri tabanı dahil edilerek hesaplanmıştır. Belirli birkaç örnek için üretilen sonuçlar, NEDA (NEutron Detector Array) deneylerine özel yazılmış ve sınanmış olan benzetimlerle karşılaştırmalı olarak sunulmuştur.

We present an analysis of fermionic dark matter (DM) in the context of 6-dimensional Effective Field Theory (EFT). We also compared the result generated via 6-dimensional EFT analysis with the current experimental results for dark matter searches. These experiments are methodically categorized as direct and indirect searches and present some constraints on dark matter model parameters of 6-dimensional EFT. We constructed a new set of tools ensuring DM researches in various platforms. The model parameters are presented to guide DM production in colliders by taking account of the upper limits at direct and indirect searches. In this paper, we apply our approach for fermionic case to test the verification of the method. There are various types of search methods for DM, each depends on type of interaction of dark matter with SM particles. Finally we analyzed fermionic DM candidate of 6-dimensional Effective Field Theory (EFT) at the platforms of DM searches. A new set of numerical tools is specified for 6-dimensional fermionic DM model, and these tools are also tested.

Abstract A clustering algorithm based on the jet (cascade of particles descendant from a single particle due to hadronization) algorithms used in High Energy Physics is presented for identification of neutron cross-talk events in neutron detector arrays with one layer by defining a temporal distance function, instead of transverse energy. Detector simulations on an array of neutron detectors show a significant improvement when compared with neighbor rejection technique and the method of gating with time-of-flight difference.

We present updated results from a simulation study of a conceptual sampling electromagnetic calorimeter based on secondary electron emission process. We implemented the secondary electron emission process in Geant4 as a user physics list and produced the energy spectrum and yield of secondary electrons. The energy resolution of the SEE calorimeter was σ/E = (41%) GeV1/2/√E and the response linearity to electromagnetic showers was to within 1.5%. The simulation results were also compared with a traditional scintillator calorimeter.

ALICE (A Large Ion Collider Experiment) is a general-purpose, heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma in nucleus-nucleus collisions at the CERN Large Hadron Collider (LHC). A large bandwidth and flexible DAQ is required to collect sufficient statistics in the short running time available per year for heavy ion and to accommodate very different requirements originated from the large set of detectors and the different beams used

Bu çalışmada karanlık maddeye en alternatif aday olan Zayıf Etkileşen Kütleli Parçacık (WIMP) ile Parçacık Fiziği’nin Standart Model parçacıkları arasındaki etkileşmelerini inceledik. Bunun için ağaç seviyesinde 6-Boyutlu Etkin Alan Teorisi yaklaşımını kullandık. Etkin Alan Teorisi modelini açık kaynak kodlu yazılım olan FeynRules’a dahil edip, daha sonra MADGraph5_AMC@NLO’ın MadDM yazılım aracı yardımıyla kalıntı bolluğunu hesaplayıp, uygun kalıntı bolluğu veren parametre aralıkları ile modeli sınırlandırdık.

The light gains of a detector system (PMT and scintillator) is characterized by the number of photoelectrons produced per unit of energy (usually MeV). In this study, the results of light gain tests for 10 Hamamatsu R11833 model photomultiplier tubes (PMT) are shown. Various radioactive sources were used in conjunction with the EJ309 liquid scintillator to determine the light gain. The number of photoelectrons produced per unit energy was determined by comparing the size of the signal generated by the photons produced by PMT during the scintillation process using radioactive sources and the size of the signal generated when a single photo electron (SPE) was produced by the PMT. The test results show that the performances of the PMTs are sufficient for neutron detector arrays used in experiments with radioactive ion beams. The supply voltage of the photomultiplier tubes must be changed to achieve similar light gains.