758 research outputs found
Radiation tolerant and controlable power supply design and implementation for the VFE of SPD at LHCB detector
Projecte Final de Carrera d'Enginyeria Electrònica, Universitat de Barcelona, Facultat de Física. Director: Atilà Herms i Berenguer. Any: 2005[cat] En el present projecte, emmarcat en el disseny electrònic de circuits de
control, es desenvolupa la font d’alimentació per als circuits de lectura de dades
(VFE) del subdetector SPD en el detector LHCb que s’està construint al CERN. Per
tant és una de les parts principals que formen aquest subdetector i s’ha d’assegurar
la seva robustesa amb el màxim de funcionalitat implementada possible. Cal tenir en
compte que tota la electrònica d’aquest subdetector treballarà sota un entorn en
radiació i, per tant, s’han de prendre totes les mesures necessàries per assegurar-ne
un correcte funcionament en aquest entorn.
El sistema de regulació de tensió es basa en reguladors lineals dissenyats de
forma específica per a una empresa privada per tal d’assegurar la resistència a la
radiació esmentada anteriorment. Pel que respecta el control d’aquesta font
s’utilitzen FPGA’s també tolerants a la radiació. La flexibilitat d’aquests dispositius
ens permeten implementar tots els elements lògics de control, comunicació i lectura
de dades necessaris per a l’aplicació.
El disseny del sistema es divideix bàsicament en les següents tasques;
definició dels requeriments (que ens vindràn limitats en la seva majoria per les
característiques de consum del VFE i de control en el subdetector), selecció dels
components a utilitzar en la implementació electrònica, disseny dels esquemes
necessaris, disseny del circuit impres, prototipatge del circuit i posta en marxa,
codificació en un llenguatge de descripció de hardware (VHDL) de les funcions de
control i finalment la comprovació del correcte funcionament del hardware. Degut a
les necessitats de control d’aquesta aplicació també s’hauran de realitzar dissenys
de circuits auxiliars i de software per tal de comprovar el correcte funcionament del
prototip.
Aquest projecte representa un bon exemple del desenvolupament complet
d’un disseny de hardware mixte digital/analògic basat en una FPGA en l’àmbit de la
recerca.[eng] In the present project we present the developement of the electronic system
of the low voltage power supply of the VFE board of the SPD subdetector in the
LHCb detector that is being built at CERN. This is a fundamental part to assure the
correct behaviour of the subdetector system. In this design we must take into account
that all the electronics of the subdetector will be exposed to relevant levels of
radiation and use the components most suituable to work in this environment.
The voltage regulator system is based in linear regulators designed by a
comercial manufacturer specially for this purpose of working under radiation
conditions. In the control part we will use FPGA’s wick are also radiation tolerant. The
flexibility of this devices will perit the implementation of all the logic elements of
control, comunications and data readout necessary for this aplication.
The design of the whole system will follow this steps; definititon of the
specifications (basically determined by the power consumption of the VFE and the
comunications system used at the subdetector), selection of the components wich
will be used, schematics design, printed circuit board design, prototiping, coding of
the FPGA funcionality in VHDL and finally checking of the complete design
behaviour. In addition and because of the control nature of this design there would be
necessary to design some auxiliar hardware and to code some software in order to
check the correct behaviour of the prototype.
This project represents a good example of a complete hardware
developement of a mixed signal system (analog and digital) in the research scope
PACIFIC: the readout ASIC for the SciFi Tracker of the upgraded LHCb detector
The LHCb detector will be upgraded during the Long Shutdown 2 (LS2) of the LHC in order to cope with higher instantaneous luminosities and will switch to a 40 MHz readout rate using a trigger-less software based system. All front-end electronics will be replaced and several sub-detectors must be redesigned to cope with the higher detector occupancy and radiation damage. The current tracking detectors downstream of the LHCb dipole magnet will be replaced by the Scintillating Fibre (SciFi) Tracker. The SciFi Tracker will use scintillating fibres read out by Silicon Photomultipliers (SiPMs). State-of-the-art multi-channel SiPM arrays are being developed and a custom ASIC, called the low-Power ASIC for the sCIntillating FIbres traCker (PACIFIC), will be used to digitise the signals from the SiPMs. This article presents an overview of the R&D for the PACIFIC. It is a 64-channel ASIC implemented in 130 nm CMOS technology, aiming at a radiation tolerant design with a power consumption below 10 mW per channel. It interfaces directly with the SiPM anode through a current mode input, and provides a configurable non-linear 2-bit per channel digital output. The SiPM signal is acquired by a current conveyor and processed with a fast shaper and a gated integrator. The digitization is performed using a three threshold non-linear flash ADC operating at 40 MHz. Simulation and test results show the PACIFIC chip prototypes functioning well
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of B0s meson decays to J/ψη and J/ψη′
First evidence of the B0 → J/ψω decay is found and the B0 s → J/ψη and B0 s → J/ψη decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment
in proton–proton collisions at a centre-of-mass energy of √s = 7 TeV.
Readout electronics for low dark count pixel detectors based on geiger mode avalanche photodiodes fabricated in conventional CMOS technologies for future linear colliders
The high sensitivity and excellent timing accuracy of Geiger mode avalanche photodiodes makes them ideal sensors as pixel detectors for particle tracking in high energy physics experiments to be performed in future linear colliders. Nevertheless, it is well known that these sensors suffer from dark counts and afterpulsing noise, which induce false hits (indistinguishable from event detection) as well as an increase of the necessary area of the readout system. In this work, we present a comparison between APDs fabricated in a high voltage 0.35 µm and a high integration 0.13 µm commercially available CMOS technologies that has been performed to determine which of them best fits the particle collider requirements. In addition, a readout circuit that allows low noise operation is introduced. Experimental characterization of the proposed pixel is also presented in this work
Study of Beauty Hadron Decays into Pairs of Charm Hadrons
First observations of the decays Λ 0 b → Λ + c D − ( s ) are reported using data corresponding to an integrated luminosity of 3 fb − 1 collected at 7 and 8 TeV center-of-mass energies in proton-proton collisions with the LHCb detector. In addition, the most precise measurement of the branching fraction B ( B 0 s → D + D − s ) is made and a search is performed for the decays B 0 ( s ) → Λ + c Λ − c . The results obtained are B ( Λ 0 b → Λ + c D − ) / B ( Λ 0 b → Λ + c D − s ) = 0.042 ± 0.003 ( stat) ± 0.003 ( syst ) , [ B ( Λ 0 b → Λ + c D − s ) B ( ¯ B 0 → D + D − s ) ] / [ B ( Λ 0 b → Λ + c π − ) B ( ¯ B 0 → D + π − ) ] = 0.96 ± 0.02 ( stat) ± 0.06 ( syst) , B ( B 0 s → D + D − s ) / B ( ¯ B 0 → D + D − s ) = 0.038 ± 0.004 ( stat) ± 0.003 ( syst) , B ( ¯ B 0 → Λ + c Λ − c ) / B ( ¯ B 0 → D + D − s ) < 0.0022 [ 95 % C . L . ] , B ( B 0 s → Λ + c Λ − c ) / B ( B 0 s → D + D − s ) < 0.30 [ 95 % C . L . ] . Measurement of the mass of the Λ 0 b baryon relative to the ¯ B 0 meson gives M ( Λ 0 b ) − M ( ¯ B 0 ) = 339.72 ± 0.24 ( stat ) ± 0.18 ( syst) MeV / c 2 . This result provides the most precise measurement of the mass of the Λ 0 b baryon to date
Measurement of resonant and CP components in ¯B0s → J/ψπ+π− decays
Structure of the decay ¯ B 0 s → J / ψ π + π − is studied using data corresponding to 3 fb − 1 of integrated luminosity from p p collisions produced by the LHC and collected by the LHCb detector. Five interfering π + π − states are required to describe the decay: f 0 ( 980 ) , f 0 ( 1500 ) , f 0 ( 1790 ) , f 2 ( 1270 ) , and f ′ 2 ( 1525 ) . An alternative model including these states and a nonresonant J / ψ π + π − component also provides a good description of the data. Based on the different transversity components measured for the spin-2 intermediate states, the final state is found to be compatible with being entirely C P odd. The C P -even part is found to be < 2.3 % at a 95% confidence level. The f 0 ( 500 ) state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the f 0 ( 980 ) of < 7. 7 ∘ at a 90% confidence level, consistent with a tetraquark interpretation of the f 0 ( 980 ) substructure
Measurement of the differential branching fraction of the decay Λb0→Λμ+μ-
The differential branching fraction of the decay Λ0 b → Λμ+μ− is measured as a function of the square of the dimuon invariant mass, q2. A yield of 78 ± 12 Λ0 b → Λμ+μ− decays is observed using data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. A significant signal is found in the q2 region above the square of the J /ψ mass, while at lower-q2 values upper limits are set on the differential branching fraction. Integrating the differential branching fraction over q2, while excluding the J /ψ and ψ(2S) regions, gives a branching fraction of B(Λ0 b → Λμ+μ−) = (0.96 ± 0.16(stat) ± 0.13(syst) ± 0.21(norm)) × 10−6, where the uncertainties are statistical, systematic and due to the normalisation mode, Λ0 b → J /ψΛ, respectively
Search for the Lepton-Flavor-Violating Decays Bs0→e±μ∓ and B0→e±μ∓
A search for the lepton-flavor-violating decays B 0 s → e ± μ ∓ and B 0 → e ± μ ∓ is performed with a data sample, corresponding to an integrated luminosity of 1.0 fb − 1 of p p collisions at √ s = 7 TeV , collected by the LHCb experiment. The observed number of B 0 s → e ± μ ∓ and B 0 → e ± μ ∓ candidates is consistent with background expectations. Upper limits on the branching fractions of both decays are determined to be B ( B 0 s → e ± μ ∓ ) 101 TeV / c 2 and M LQ ( B 0 → e ± μ ∓ ) > 126 TeV / c 2 at 95% C.L., and are a factor of 2 higher than the previous bounds
Studies of beauty baryon decays to D0ph− and Λ+ch− final states
Decays of beauty baryons to the D 0 p h − and Λ + c h − final states (where h indicates a pion or a kaon) are studied using a data sample of p p collisions, corresponding to an integrated luminosity of 1.0 fb − 1 , collected by the LHCb detector. The Cabibbo-suppressed decays Λ 0 b → D 0 p K − and Λ 0 b → Λ + c K − are observed, and their branching fractions are measured with respect to the decays Λ 0 b → D 0 p π − and Λ 0 b → Λ + c π − . In addition, the first observation is reported of the decay of the neutral beauty-strange baryon Ξ 0 b to the D 0 p K − final state, and a measurement of the Ξ 0 b mass is performed. Evidence of the Ξ 0 b → Λ + c K − decay is also reported
Study of B0(s)→K0Sh+h′− decays with first observation of B0s→K0SK±π∓ and B0s→K0Sπ+π
A search for charmless three-body decays of B 0 and B0s mesons with a K0S meson in the final state is performed using the pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected at a centre-of-mass energy of 7 TeV recorded by the LHCb experiment. Branching fractions of the B0(s)→K0Sh+h′− decay modes (h (′) = π, K), relative to the well measured B0→K0Sπ+π− decay, are obtained. First observation of the decay modes B0s→K0SK±π∓ and B0s→K0Sπ+π− and confirmation of the decay B0→K0SK±π∓ are reported. The following relative branching fraction measurements or limits are obtained $ B(B0→K0SK±π∓)B(B0→K0Sπ+π−)=0.128±0.017(stat.)±0.009(syst.),B(B0→K0SK+K−)B(B0→K0Sπ+π−)=0.385±0.031(stat.)±0.023(syst.),B(B0s→K0Sπ+π−)B(B0→K0Sπ+π−)=0.29±0.06(stat.)±0.03(syst.)±0.02(fs/fd),B(B0s→K0SK±π∓)B(B0→K0Sπ+π−)=1.48±0.12(stat.)±0.08(syst.)±0.12(fs/fd)B(B0s→K0SK+K−)B(B0→K0Sπ+π−)∈[0.004;0.068]at90%CL
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