A5102771252- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- CCD and CMOS Imaging Sensors
- Particle physics theoretical and experimental studies
- Advancements in Semiconductor Devices and Circuit Design
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- High-Energy Particle Collisions Research
- Radiation Effects in Electronics
- Dark Matter and Cosmic Phenomena
- Analog and Mixed-Signal Circuit Design
- Neutrino Physics Research
- Sensor Technology and Measurement Systems
- Astronomical Observations and Instrumentation
- Semiconductor materials and devices
- Advanced Semiconductor Detectors and Materials
- Medical Imaging Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Infrared Target Detection Methodologies
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Superconducting and THz Device Technology
- Electron and X-Ray Spectroscopy Techniques
- Particle accelerators and beam dynamics
- Analytical Chemistry and Sensors
Brookhaven National Laboratory
2015-2024
RIKEN BNL Research Center
2004-2007
RIKEN
2004
Brookhaven College
1987-2003
Associated Universities, Inc.
2002
The Ohio State University
2000
European Organization for Nuclear Research
1985
Rudjer Boskovic Institute
1963
An analysis is presented of signal, noise and position resolution relations for some the most interesting position-sensing methods. "Electronic cooling" delay line terminations introduced in order to reduce with lines. A new method terminating transmission lines "noiseless" damping which employs a capacitance feedback presented. It shown that charge division resistive electrodes determined only by electrode not resistance, if optimum filtering used.
A summary of a comprehensive analysis theoretical and practical aspects position sensing by charge division from resistive electrodes is presented. Properties transformer decoupling the electrode detection bias voltage are analyzed compared to usual capacitive methods. Optimization limitation signal shaping discussed as function diffusion time constant, rise times, noise.
In this paper the idea of a general signal processing system which should satisfy various pulse rate and noise requirements is explored. Optimum functions (weighting functions) are considered for an ideal system, real conditions where effects like imperfect pole-zero cancellation present. Time-variant filters gain-varying class used to realize required optimum weighting finite width. It shown how nonfinite-width some time-invariant can be modified into finite-width by switching. These...
Anesthesia is currently required for positron emission tomography (PET) studies of the animal brain in order to eliminate motion artifacts. However, anesthesia profoundly affects neurological state animal, complicating interpretation PET data. Furthermore, it precludes use study during normal behavior. The rat conscious tomograph (RatCAP) designed need studies. It a miniaturized full-ring scanner that attached directly head, imaging nearly entire brain. RatCAP utilizes arrays 2 mm /spl...
To satisfy the increasing interest in integration of electronics onto optical and ionizing particle fully depleted detectors, a nonconventional JFET (junction field-effect transistor), designed to operate on completely depleted, 2-k Omega -cm resistivity silicon substrate, has been designed, fabricated, tested at room temperature. The devices show very low gate leakage current, output conductance, transconductance per unit width 3 mS/mm, pinch-off voltage -1.5 V. detectors makes possible...
A filter with a trapezoidal weighting function is the optimum one when both noise and variations in charge collection time are present, was realized by time-variant (gated filter) system. This paper presents results obtained large germanium detectors at high rates higher energies, showing that filtering essential for good resolution this case.
The purpose of this paper is to provide an insight into low frequency divergent noises with spectral density |f|α, where α` ≤ -1, and their effect on physical measurements, special reference 1/|f| noise. This class noise widespread in nature, it presents unique limitations the measurement accuracy. In attempt present a picture regard measurements observable quantities, questions about generation noise, its divergence, correlation properties variance are discussed. A statistical model for...
Measurements of the influence stress upon contact potential necessitate observation shifts in order 100 μV or less. The ac Kelvin technique was selected to yield this sensitivity. application phase sensitive detection techniques method is discussed, and equations are solved. success depends use a guarded field effect transistor input stage located within probe. nonuniform potentials capacitor plate separation analyzed, conditions given for balance point be independent spacing. dependent...
We present a front-end application-specific integrated circuit (ASIC) for wire based time-projection-chamber (TPC) operating in liquid Argon (LAr). The LAr TPC will be used long baseline neutrino oscillation experiments. ASIC must provide low-noise readout of the signals induced on wires, digitization those at 2 MSamples/s, compression, buffering and multiplexing. A resolution better than 1000 rms electrons 200 pF input capacitance an range 300 fC is required, along with low power operation...
The effect of baseline restoration on signal-to-noise ratio in pulse-amplitude measurements is determined theoretically and experimentally. It found that the with normalized to without ηr/η=[1+α− 2α½kx(τ)]−½, where kx(τ) noise correlation factor at output filter (amplifier), τ measurement interval, α attenuation power due integration by restorer capacitance switch resistance (α=1 for fast restorer). Methods calculation functions are outlined. A method oscilloscope described. results...
The drift time measurement and the charge division can be performed simultaneously on same electrode (resistive anode) without affecting accuracy of either measurement. It is shown that for shortest there an optimum value anode wire resistance. signal requirement a position uncertainty σ≤ 0.5% length only 2.7 x 106 electron charges. chamber operated in linear mode with negligible space effects, so it also used ΔE/ΔX measurements. A simple preamplifier optimized both measurements using...
The ATLAS detector has been designed for operation at CERN's Large Hadron Collider. includes a complex system of liquid argon calorimeters. electronics amplifying, shaping, sampling, pipelining, and digitizing the calorimeter signals is implemented on Front End Boards (FEBs). This paper describes design, implementation production FEBs presents measurement results from testing performed several stages during process.
The choice between cold and warm electronics (inside or outside the cryostat) in very large LAr TPCs (>5-10 ktons) is not an issue, but it rather a major cryostat design issue. This because location of signal processing has direct far reaching effect on design, indirect TPC electrode (sense wire spacing, length drift distance), significant performance. All these factors weigh so overwhelmingly favor that remains optimal solution for TPCs. In this paper noise considerations are summarized,...