Search

Several methods for the determination of the mass of the top quark with the ATLAS detector at the LHC are presented. All dominant decay channels of the top quark can be explored. The measurements are in most cases dominated by systematic uncertainties. New methods have been developed to control those related to the detector. The results indicate that a total error on the top mass at the level of 1 GeV should be achievable. [ABSTRACT FROM AUTHOR]

In this paper, we present the physics performance of the ESSnuSB experiment in the standard three flavor scenario using the updated neutrino flux calculated specifically for the ESSnuSB configuration and updated migration matrices for the far detector. Taking conservative systematic uncertainties corresponding to a normalization error of 5 % for signal and 10 % for background, we find that there is 10 σ (13 σ) CP violation discovery sensitivity for the baseline option of 540 km (360 km) at δ CP = ± 90 ∘ . The corresponding fraction of δ CP for which CP violation can be discovered at more than 5 σ is 70 % . Regarding CP precision measurements, the 1 σ error associated with δ CP = 0 ∘ is around 5 ∘ and with δ CP = - 90 ∘ is around 14 ∘ (7 ∘) for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have 3 σ sensitivity for 540 km baseline except δ CP = ± 90 ∘ and 5 σ sensitivity for 360 km baseline for all values of δ CP . The octant of θ 23 can be determined at 3 σ for the values of: θ 23 > 51 ∘ ( θ 23 < 42 ∘ and θ 23 > 49 ∘ ) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at 3 σ are: 40 ∘ < θ 23 < 52 ∘ ( 42 ∘ < θ 23 < 51. 5 ∘ ) and 2.485 × 10 - 3 eV 2 < Δ m 31 2 < 2.545 × 10 - 3 eV 2 ( 2.49 × 10 - 3 eV 2 < Δ m 31 2 < 2.54 × 10 - 3 eV 2 ) for the baseline of 540 km (360 km). [ABSTRACT FROM AUTHOR]

Electronic components must be tested to ensure reliable performance in high radiation environments such as Hi-Limu LHC and space. We propose a defocusing beam line to perform proton irradiation tests in Turkey. The Turkish Atomic Energy Authority SANAEM Proton Accelerator Facility was inaugurated in May 2012 for radioisotope production. The facility has also an R&D room for research purposes. The accelerator produces protons with 30 MeV kinetic energy and the beam current is variable between 10 μ A and 1.2 mA . The beam kinetic energy is suitable for irradiation tests, however the beam current is high and therefore the flux must be lowered. We plan to build a defocusing beam line (DBL) in order to enlarge the beam size, reduce the flux to match the required specifications for the irradiation tests. Current design includes the beam transport and the final focusing magnets to blow up the beam. Scattering foils and a collimator is placed for the reduction of the beam flux. The DBL is designed to provide fluxes between 10 7 p / cm 2 / s and 10 9 p / cm 2 / s for performing irradiation tests in an area of 15.4 cm × 21.5 cm . The facility will be the first irradiation facility of its kind in Turkey. [ABSTRACT FROM AUTHOR]

Space radiation can affect performance of electronic components during a satellite's mission. In order to ensure reliable performance, these components must be tested under some types of radiation. Middle East Technical University-Defocusing Beam Line (METU-DBL) project aims to perform Single Event Effect (SEE) tests for space, HiLumi LHC, nuclear and other applications. ESA ESCC No. 25100 Standard Single Event Effect Test Method and Guidelines is considered for these SEE tests. Turkish Atomic Energy Authority (TAEA) has a cyclotron which can accelerate protons up to 30 MeV kinetic energy at the Proton Accelerator Facility (PAF) mainly for radioisotope production and for R&D purposes. According to the standard, the proton beam kinetic energy must be between 20 MeV and 200 MeV. While the proton energy is suitable for SEE tests, the beam size must be 15.40 cm × 21.55 cm and the flux must be between 1 0 5 p/cm 2 /s to at least 1 0 8 p/cm 2 /s according to the standard. The beam size at the entrance of the R&D room is mm-sized and the current is variable between 10 μ A and 1.2 mA. Therefore, a defocusing beam line has been designed to enlarge the beam size and reduce the flux. The beam line has three quadrupole magnets to enlarge the beam size and collimators and scattering foils are used for flux reduction. Currently, METU-DBL preliminary test setup, which was installed in the R&D room, enlarges the beam size with only two quadrupole magnets and it reduces the proton flux with a collimator. The final beam size is about 6 cm × 8 cm and the beam flux is ∼ 1 0 9 p/cm 2 /s. The first tests of electronic components were performed and the commissioning results from the beam measurement system are here presented. [ABSTRACT FROM AUTHOR]

Abstract: We are reporting about a scintillating fibre tracking detector which is proposed for the precise determination of the absolute luminosity of the CERN LHC at interaction point 1 where the ATLAS experiment is located. The detector needs to track protons elastically scattered under angles in direct vicinity to the LHC beam. It is based on square shaped scintillating plastic fibres read out by multi-anode photomultiplier tubes and is housed in Roman Pots. We describe the design and construction of prototype detectors and the results of a beam test experiment at DESY. The excellent detector performance established in this test validates the detector design and supports the feasibility of the proposed challenging method of luminosity measurement. [Copyright &y& Elsevier]

Timepix, a pixel detector, was installed in the H4IRRAD irradiation area at CERN to study its response to a mixed radiation field. The measured data were compared to Monte Carlo simulations performed by the FLUKA code. This paper focuses on thermal neutron fluence measurement and simulation studies. The observed disagreement between the measured and simulated thermal neutron fluence of a factor 2.6 is discussed and the influence of the shielding material composition on this disagreement is studied. [ABSTRACT FROM AUTHOR]