Instituto Galego de Física de Altas Enerxías (IGFAE)http://hdl.handle.net/10347/29872024-03-28T17:56:37Z2024-03-28T17:56:37ZStudy of scintillation properties and performance of CsI(Tl) detectors over timeGarcía-Jiménez, GabrielCabanelas Eiras, PabloGonzález-Caamaño, DavidÁlvarez Pol, HéctorVicente-Pardal, M.A.Benlliure Anaya, José FernandoCederkäll, J.Cortina Gil, María DoloresFeijoo Fontán, MartinaGraña González, AntíaRodríguez Sánchez, José Luishttp://hdl.handle.net/10347/329182024-03-21T09:21:43Z2024-01-01T00:00:00ZStudy of scintillation properties and performance of CsI(Tl) detectors over time
García-Jiménez, Gabriel; Cabanelas Eiras, Pablo; González-Caamaño, David; Álvarez Pol, Héctor; Vicente-Pardal, M.A.; Benlliure Anaya, José Fernando; Cederkäll, J.; Cortina Gil, María Dolores; Feijoo Fontán, Martina; Graña González, Antía; Rodríguez Sánchez, José Luis
This work presents a systematic study of the properties (Light Output Non-Uniformity (LONU) and energy resolution) of two CsI(Tl) scintillation units over a span of almost three years, under adverse conditions of humidity and temperature. These two crystals are part of the CALIFA detector, a highly segmented calorimeter and spectrometer for
rays and light-charged particles, that is placed surrounding the reaction target at Cave C, the experimental cave of the R
B (Reactions with Radioactive Relativistic Beams) collaboration at the GSI-FAIR facilities in Darmstadt, Germany. The findings obtained after the experiment indicate that there was no significant impact on the performance in terms of resolution and LONU. This suggests that the employed wrapping for light collection effectively serves as an excellent barrier against humidity. As a result, the crystal is preserved in a far better condition than initially anticipated.
2024-01-01T00:00:00ZDiamond-like carbon coatings for cryogenic operation of particle detectorsLeardini, SaraZhou, YiTesi, AndreaMéndez Morales, TrinidadGonzález Díaz, DiegoBreskin, AmosBressler, ShikmaMoleri, LucaPeskov, V.http://hdl.handle.net/10347/303092023-03-15T03:03:14Z2023-01-01T00:00:00ZDiamond-like carbon coatings for cryogenic operation of particle detectors
Leardini, Sara; Zhou, Yi; Tesi, Andrea; Méndez Morales, Trinidad; González Díaz, Diego; Breskin, Amos; Bressler, Shikma; Moleri, Luca; Peskov, V.
Characterization of diamond-like carbon (DLC) coatings at cryogenic temperatures (down to 77 K) is presented, covering the electrical resistivity range of practical interest to gaseous and liquid particle instrumentation: [...]. The good behaviour observed in terms of linearity, surface uniformity and stability with time and transported charge add to other well-known characteristics like low chemical reactivity and tolerance to radiation. The observed temperature dependence and stability of electrical properties with transported charge is consistent with a conductivity mechanism based on 2-dimensional variable-range electron hopping, as expected for the surface conductivity of thin films made from amorphous carbon. First results from a resistive-protected WELL detector (‘RWELL’) built with DLC and operated close to the liquid–vapour coexistence point of argon (87.5 K at 1 bar) are presented
2023-01-01T00:00:00ZSilicon vertex detector with timing for the Upgrade II of LHCbRodríguez Rodríguez, Efrénhttp://hdl.handle.net/10347/302892023-03-11T03:03:08Z2023-01-01T00:00:00ZSilicon vertex detector with timing for the Upgrade II of LHCb
Rodríguez Rodríguez, Efrén
LHCb has recently submitted a physics case for an Upgrade II detector to begin operation in 2031. The upcoming upgrade is designed to run at instantaneous luminosities of, to accumulate a data sample with a corresponding integrated luminosity of over. The LHCb physics programme relies on an efficient and precise vertex detector (VELO). Compared to Upgrade I, the data output rates, radiation levels and occupancies will be about ten times higher. To cope with the pile-up increase, new techniques to assign -quark–hadrons to their primary vertex, and to perform the real-time pattern recognition are needed. To solve these problems, a new 4D hybrid pixel detector with enhanced rate and timing capabilities in the ASIC and sensor will be developed. This report will discuss the most promising technologies to be used in the future upgrade for the HL-LHC, with emphasis on the timing precision as a tool for vertexing in the next generation detectors. An initial simulation effort has been made to investigate what would be the required temporal resolution sufficient to mitigate pile-up and identify secondary vertices, which points to at least 20 ps per track. The most recent results from beam tests motivated by time measurements will be presented together with the scenarios for the future upgrade. Improvements in the mechanical design of the Upgrade II VELO will also be needed to allow for periodic module replacement. The design will be further optimised to minimise the material before the first measured point on a track and to achieve a fully integrated module design with thinned sensors and ASICs combined with a lightweight cooling solution
2023-01-01T00:00:00ZRescaling the isospin triangle argument for constraining ϕ2 (α): consolidating Belle II and a potential path forward for LHCbDalseno, Jeremyhttp://hdl.handle.net/10347/291832022-08-31T02:02:41Z2022-01-01T00:00:00ZRescaling the isospin triangle argument for constraining ϕ2 (α): consolidating Belle II and a potential path forward for LHCb
Dalseno, Jeremy
A rescaling of the SU(2) isospin triangles constraining ϕ2 (α) that relies on measurements of the experimentally cleaner relative branching fractions, as opposed to those absolute, is proposed. Paving the way towards more systematically sustainable analysis, this method promises to eliminate a dominant systematic at Belle II amongst others, namely the uncertainty on the number of BB¯ pairs in data. Furthermore, a ϕ2 constraint in the B→ρρ system at LHCb that is more independent of Belle II input is shown to become viable even without a measurement of CP violation in B0→ρ+ρ−
2022-01-01T00:00:00Z