New experimental and analysis methods in I-DLTS Pandey, S.U; Middelkamp, P; Li, Z ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/1999, Letnik:
426, Številka:
1
Journal Article
Recenzirano
Odprti dostop
A simple modification to traditional experimental apparatus to perform I-DLTS measurements is presented. This setup is shown to be faster and more sensitive than traditional double boxcar I-DLTS ...systems. A novel analysis technique utilising multiple exponential fits to the I-DLTS signal from a highly neutron irradiated silicon sample is presented along with a discussion of the results. It is shown that the new method has better resolution and can deconvolute overlapping peaks more accurately than previous methods.
Silicon drift detectors for the STAR/SVT experiment at RHIC Takahashi, J.; Bellwied, R.; Beuttenmuller, R. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2000, Letnik:
439, Številka:
2
Journal Article
Recenzirano
Odprti dostop
Large-area linear Silicon Drift Detectors (SDD) were developed to be used in the Silicon Vertex Tracker (SVT) of the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). The design of ...the SDD has been finalized and submitted for large-scale production. Test results show that the detector exhibits excellent position resolution and low noise. A special characterization procedure was developed to test detector wafers in order to select good detectors for the SVT. Recently, 15 STAR/SVT SDDs were assembled as a tracking device in a BNL-AGS heavy-ion experiment (E896). This was the first tracking application of these detectors and their corresponding front-end electronics in an experimental environment. Preliminary results indicating good detector performance are shown and discussed in this paper.
The silicon drift vertex detector for the STAR experiment at RHIC Pandey, S.U.; Bellwied, R.; Beuttenmulller, R. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2002, Letnik:
477, Številka:
1
Journal Article
Recenzirano
The current status of the STAR Silicon Vertex Tracker (SVT) is presented. The performance of the Silicon Drift Detectors (SDD) is discussed. Results for a recent 15 layer SDD tracker which prototypes ...all components of the SVT are presented. The enhanced physics capabilities of the STAR detector due to the addition of the SVT are addressed.
Studies of dynamics of electron clouds in STAR silicon drift detectors Bellwied, R.; Beuttenmuller, R.; Brandon, N. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2000, Letnik:
439, Številka:
2
Journal Article
Recenzirano
The dynamics of electrons generated in silicon drift detectors was studied using an IR LED. Electrons were generated at different drift distances. In this way, the evolution of the cloud as a ...function of drift time was measured. Two methods were used to measure the cloud size. The method of cumulative functions was used to extract the electron cloud profiles. Another method obtains the cloud width from measurements of the charge collected on a single anode as a function of coordinate of the light spot. The evolution of the electron cloud width with drift time is compared with theoretical calculations. Experimental results agreed with theoretical expectations.
K
S
0,
Λ,
Ξ,
Ω and negative particle yields and transverse mass spectra have been measured at central rapidity in Pb–Pb and p–Pb collisions at 158
A GeV/
c. Yields are studied as a function of the ...number of nucleons participating in the collision
N
part, which is estimated with the Glauber model. From p–Pb to Pb–Pb collisions the particle yields per participant increase substantially. The enhancement is more pronounced for multistrange particles, and exceeds an order of magnitude for the
Ω. For a number of participants,
N
part, greater than 100, however, all yields per participant appear to be constant.
Silicon pixel devices as a slow neutron precise position detector Campbell, M.; Heijne, E.H.M.; Kubašta, J. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/1997, Letnik:
395, Številka:
3
Journal Article
Recenzirano
An application of a silicon pixel matrix for precise coordinate measurement of slow neutrons is demonstrated. A layer of
6LiF is used as a neutron converter. Charged particles produced in the ...reaction
6Li(n, α)T are detected by silicon pixel diodes. Such a technique can be used for neutron imaging or neutron radiography.
The STAR silicon vertex tracker: a large area silicon drift detector Lynn, D; Bellwied, R; Beuttenmuller, R ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2000, Letnik:
447, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The Solenoidal Tracker At RHIC-Silicon Vertex Tracker (STAR-SVT) is a three barrel microvertex detector based upon silicon drift detector technology. As designed for the STAR-SVT, silicon drift ...detectors (SDDs) are capable of providing unambiguous two-dimensional hit position measurements with resolutions on the order of
20
μm
in each coordinate. Achievement of such resolutions, particularly in the drift direction coordinate, depends upon certain characteristics of silicon and drift detector geometry that are uniquely critical for silicon drift detectors hit measurements. Here we describe features of the design of the STAR-SVT SDDs and the front-end electronics that are motivated by such characteristics.
We have developed a thick film multi-chip module for readout of silicon drift (or low capacitance ∼200
fF) detectors. Main elements of the module include a custom 16-channel NPN-BJT ...preamplifier-shaper (PASA) and a custom 16-channel CMOS Switched Capacitor Array (SCA). The primary design criteria of the module were the minimizations of the power (12
mW/channel), noise (ENC=490
e
−
rms), size (20.5
mm×63
mm), and radiation length (1.4%). We will discuss various aspects of the PASA design, with emphasis on the preamplifier feedback network. The SCA is a modification of an integrated circuit that has been previously described 1; its design features specific to its application in the SVT (Silicon Vertex Tracker in the STAR experiment at RHIC) will be discussed. The 240-channel multi-chip module is a circuit with five metal layers fabricated in thick film technology on a beryllia substrate and contains 35 custom and commercial integrated circuits. It has been recently integrated with silicon drift detectors in both a prototype system assembly for the SVT and a silicon drift array for the E896 experiment at the Alternating Gradient Synchrotron at the Brookhaven National Laboratory. We will discuss features of the module's design and fabrication, report the test results, and emphasize its performance both on the bench and under experimental conditions.
Gallium arsenide pixel detectors for medical imaging Da Via, C.; Bates, R.; Bertolucci, E. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/1997, Letnik:
395, Številka:
1
Journal Article
Recenzirano
Gallium arsenide pixel detectors processed on a 200 μm Semi-Insulating (SI) Hitachi substrate were bump-bonded to the Omega3 electronics developed at CERN for high energy physics 1. The pixel ...dimensions are 50
μm × 500
μm for a total of 2048 cells and an active area of ∼0.5 cm
2. Our aim is to use this system for medical imaging. We report the results obtained after irradiation of the detector with different X-ray sources on phantoms with different contrasts. The system showed good sensitivity to X-rays from
241Am (60 keV) and
109Cd (22.1 keV). It is also sensitive to
β
− particles from
90Sr as well as from
32P which is used as a tracer for autoradiography applications. The inherent high absorption efficiency of GaAs associated with the self-triggering capabilities of the pixel readout system reduced considerably the acquisition time compared with traditional systems based on silicon or emulsions. The present configuration is not optimised for X-ray imaging. The reduction of the pixel dimensions to 200
μm × 200
μm together with the integration of a counter in the pixel electronics would make the detector competitive for applications like mammography or dental radiology. For certain applications in biochemistry, such as DNA sequencing, where good spatial resolution is required only in one direction, the present setup should allow the best spatial resolution available up to now with respect to other digital autoradiographic systems. DNA sequencing tests are now under way.
In the framework of the RD19 collaboration, a binary silicon pixel detector system has been tested in a magnetic field between −2 and +2 T. The spatial resolution was measured using a high-resolution ...silicon strip telescope as reference. A detection efficiency of 99.8% independent of the magnetic field was found. The magnetic field influences the amount of charge sharing between the pixels which, for the binary system, results in a change of the ratio of double hits to single hits. A simple model for the charge drift in silicon under the influence of a magnetic field was established and the model predictions are in good agreement with the experimental results.
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