Recent results from the Front-End electronics of the Detector of Internally Reflected Cerenkov light (DIRC) for the BaBar experiment at SLAC (Stanford, USA) are presented. It measures to better than ...1 ns the arrival time of Cerenkov photoelectrons detected in a 11000 phototubes array and their amplitude spectra. It mainly comprises 64-channel DIRC Front-End Boards (DFB) equipped with eight full-custom analog chips performing zero-cross discrimination with 2 mV threshold and pulse shaping, four full-custom digital time to digital chips (TDC) for timing measurements with 500 ps binning and a readout logic selecting hits in the trigger window, and DIRC Crate Controller cards (DCC) serializing the data collected front up to 16 DFBs onto a 1.2 Gb/s optical link. Extensive test results of the pre-production chips are presented, as well as system tests.
A 16-channel digital TDC chip has been built for the DIRC Cherenkov counter of the BaBar experiment at the SLAC B-factory (Stanford, USA). The binning is 0.5, the conversion time 32 and the ...full-scale 32
μs. The data driven architecture integrates channel buffering and selective readout of data falling within a programmable time window. The time measuring scale is constantly locked to the phase of the (external) clock. The linearity is better than 80
ps
rms. The dead time loss is less than 0.1% for incoherent random input at a rate of 100
kHz on each channel. At such a rate the power dissipation is less than 100
nW. The die size is 36
mm
2.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The first results from a time-of-flight beam test of silicon photomultipliers (SiPm) with quartz Cherenkov radiators obtained in the Fermilab Test Beam Facility are discussed. The timing measurement ...was performed with commercial electronics that were commissioned in the Fermilab SiPm timing facility. The plan for a new time-of-flight system for the test beam facility, with the goal of obtaining a few tens picosecond time resolution is presented.
A highly integrated readout scheme for silicon trackers making use of deep sub-micron CMOS electronics (DSM) is presented. In the context of the International Linear Collider (ILC) trackers ...developments, a 16-channel readout chip for silicon strips detector has been designed in 180 nm CMOS technology, each channel comprising a low noise amplifier, a pulse shaper, a sample and hold and a comparator. Results are presented.
A computer simulation study has been conducted to investigate the design of a PET detector module. The detector unit consisted of a 24×24 array of pixelated LSO crystals, each was 4×4×25 mm 3 in ...size, and two 102×102 mm 2 microchannel plate (MCP) PMTs coupled to both sides of scintillators. The crystal pitch was 4.25 mm and reflective media was inserted between crystals. The signals from MCP were readout using a transmission-line scheme. The optical photon inside scintillator was simulated by using the Geant4 package and the output signals of the MCP was formed by applying the electrical responses measured of the MCP to each individual detected photon. A experimental setup was built using a Photonis planacon MCP(XP85022) and a Transmission line board to measure the characteristics of MCP/TL. The measured single photoelectron response(SER) was fed to the simulation of the electrical signal. The responses to 511 keV gamma of the test setup were compared to the simulation results for the validation. The simulation study results showed an energy resolution of ~11% at 511 keV for the detector module. When using a 400-600 keV energy window, we obtained a coincidence timing resolution of ~323 ps FWHM and a coincidence detection efficiency of ~40% for normally incident 511 keV photons. The position resolution was measured to be ~4.25 mm. The readout at both ends of scintillator made it possible to infer depth of interaction(DOI) based on the energy asymmetry and time differences. The simulation study showed that the design is suitable for Time of Flight(TOF) PET with DOI capability.
A PET detector design using the continuous scintillator slab was investigated. The detector unit consists of two layers of LSO scintillator slab, each slab size of 102×102×5mm 3 , and two large area ...microchannel plate (MCP) PMTs, 102×102mm 2 , coupled to scintillator slabs. The optical photon inside scintillator was simulated using Geant4 package and the electrical signal of MCP was formed using the measured characteristics of MCP and Geant4 output. The signals from MCP were readout using the transmission line (TL) scheme with 4.25mm pitch. The multi-layers of structure enable us to extract the depth of interaction in addition to position, energy and timing in an event. The detector response was measured by impinging the pair of 511keV gamma upon the detector. As preliminary results, we obtained ~12% (FWHM) of energy resolution at 511keV and ~360ps (FWHM) coincidence timing resolution while keeping 14% detection efficiency at 511keV. The position resolution was measured ~2.3mm (RMS) at the center. Due to its simplified structure, the detector can be easily extendable to several layers of slab to increase the sensitivity. The fast timing characteristics of MCP combined with the high sensitivity of LSO makes this design reliable for TOF PET application.
The DIRC detector at BaBar Adam, I.; Aleksan, R.; Aston, D. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/1999, Volume:
433, Issue:
1
Journal Article
Peer reviewed
A dedicated particle identification system based on the Detection of Internally Reflected Cherenkov (DIRC) light will be used in the BaBar detector. We provide an overview of the DIRC concept, ...design, and expected performance of the production device and a status report on its construction and commissioning. The DIRC is expected to be operating in the BaBar detector on beam line at the PEP-II B Factory in late spring 1999.
Full text
Available for:
IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The Front-End electronics of the Detector of Internally Reflected Cerenkov light (DIRC) for the BaBar experiment is presented. Its aim is to measure to better than 1 ns the arrival time of Cerenkov ...photoelectrons, detected in a 11000 phototubes array and their amplitude spectra. It mainly comprises 64-channel DIRC Front-End Boards (DFB) equipped with eight full-custom analog chips performing zero-cross discrimination with 2 mV threshold and pulse shaping, four full-custom digital TDC chips for timing measurements with and a readout logic selecting hits in the trigger window, and DIRC Crate Controller cards (DCC) serializing the data collected from up to 16 DFBs onto a 1.2 Gb/s optical link. Extensive test results of the pre-production chips are presented, as well as system tests.
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