The BaBar silicon vertex tracker Bozzi, C.; Carassiti, V.; Ramusino, A.Cotta ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/1999, Letnik:
435, Številka:
1
Journal Article
Recenzirano
The Silicon Vertex Tracker (SVT) for the BaBar experiment at the PEP-II asymmetric B factory is a 5-layer device based on double-sided, AC-coupled silicon strip detectors. It is read out by a custom ...IC, the AToM chip, that can simultaneously acquire, digitize and transmit data. The main purpose of the SVT is to accurately measure the decay position of the B mesons that are produced, which is essential for extracting CP asymmetries. Here, we report on the SVT design as well as progress on its fabrication and assembly.
SYRMEP front-end and read-out electronics Arfelli, F; Bonvicini, V; Bravin, A ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/1998, Letnik:
409, Številka:
1-3
Journal Article
Recenzirano
The SYRMEP approach to digital mammography implies the use of a monochromatic X-ray beam from a synchrotron source and a slot of superimposed silicon microstrip detectors as a scanning image ...receptor. The microstrips are read by 32-channel chips mounted on 7-layer hybrid circuits which receive control signals and operating voltages from a MASTER-SLAVE configuration of cards.
The MASTER card is driven by the CIRM, a dedicated CAMAC module whose timing function can be easily excluded to obtain data-storage-only units connected to different MASTERs: this second-level modular expansion capability fully achieves the tasks of an electronics system able to follow the SYRMEP detector growth till the final size of seven thousands of channels.
A synchrotron radiation beamline devoted to medical imaging has been built by the SYRMEP collaboration at Elettra in Trieste, Italy, and is now in operation. The SYRMEP imaging system is based on the ...combination of a monochromatic, laminar X-ray beam, with a laminar, high-efficiency pixel silicon detector. To image soft tissue, including small, low-contrast details, as in mammography, beam energies should be chosen in the range from 15 keV to 30 keV and the detector should be capable of single-photon counting. The SYRMEP beamline originates from a bending magnet light port and consists basically of a Be window, a slit system and a Si(1,1,1) crystal monochromator. The experimental area is equipped with a radiation flux monitor, a sample movement stage, and a positioning system holding the silicon detector. Images are obtained by keeping the detector stationary with respect to the beam and by scanning the sample through the beam itself. The current detector is a linear array of 200/spl times/300 /spl mu/m/sup 2/ pixels, each coupled to its electronic counting chain on a custom VLSI read-out chip. We present a summary of beam studies, and digital images of standard RMI 160 and RMI 180 Ackermann Mammographic phantoms. Results show the high contrast resolution and the large dynamic range which constitute the defining characteristics of the SYRMEP imaging system.
Searches for the Standard Model Higgs boson have been performed in the data collected by the DELPHI experiment at LEP in the year 2000 at centre-of-mass energies between 200 and 209 GeV corresponding ...to a total integrated luminosity of 224 pb
−1. No evidence for a Higgs signal is observed in the kinematically accessible mass range, and a 95% CL lower mass limit of 114.3 GeV/
c
2 is set, to be compared with an expected median limit of 113.5 GeV/
c
2 for these data.
We present a measurement of the parameters of the $\Upsilon(10580)$ resonance based on a dataset collected with the BABAR detector at the SLAC PEP-II asymmetric $B$ factory. We measure the total ...width $\Gamma_{\rm tot}$ to be $(20.7\pm1.6\pm2.5) {\rm MeV}$, the electronic partial width $\Gamma_{ee} = (0.321\pm0.017\pm0.029) {\rm keV}$ and the mass $M = (10579.3\pm0.4\pm1.2) {\rm MeV/c^2}$.
Inclusive J/ψ production in photon–photon collisions has been observed at LEP II beam energies. A clear signal from the reaction γγ→J/ψ+X is seen. The number of observed N(J/ψ→μ+μ−) events is 36±7 ...for an integrated luminosity of 617 pb−1, yielding a cross-section of σ(J/ψ+X)=45±9(stat)±17(syst) pb. Based on a study of the event shapes of different types of γγ processes in the PYTHIA program, we conclude that (74±22)% of the observed J/ψ events are due to ‘resolved’ photons, the dominant contribution of which is most probably due to the gluon content of the photon.
SYRMEP: an innovative detection system for soft X-rays Arfelli, F.; Barbiellini, G.; Bonvicini, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/1997, Letnik:
392, Številka:
1
Journal Article
Recenzirano
Odprti dostop
In the field of digital mammography, the SYRMEP (SY nchrotron Radiation for MEdical Physics) collaboration intends to use as a source the 10–35 keV photons from a monochromatic beam at the ...synchrotron ELETTRA in Trieste, and as a detector a brick of silicon microstrip detectors with the beam impinging along the strip direction. In this way, the absorption efficiency is maximized and a pixel-like matrix is obtained with pixel dimensions given by the detector thickness and the strip pitch.
The digital images are obtained using a photon counting technique. We present here the results obtained with an AC-coupled FOXFET detector with 200 × 300
μm
2 pixels and a hybrid electronics, both with a standard X-ray tube and the monochromatic beam.
PDF
