A. Pozza
fondazione bruno kessler
Publications 23
Abstract The luminosity upgrade of the Large Hadron Collider (LHC), the sLHC, will constitute an extremely challenging radiation environment for tracking detectors. Significant improvements in radiation hardness are needed to cope with the increased radiation dose, requiring new tracking detectors. In the upgraded ATLAS detector the region from 20 to 50 cm distance to the beam will be covered by silicon strip detectors (SSD) with short strips. These will have to withstand a 1 MeV neutron equival...
3 CitationsSource
In the past two years 3D silicon radiation detectors have been developed at ITC-irst (Trento, Italy). As a first step toward full 3D devices, simplified structures featuring columnar electrodes of one doping type only were fabricated. This paper reports the electro-optical characterization of 3D test diodes made with this approach. Experimental results and TCAD simulations provide good insight into the charge collection mechanism and response speed limitation of these structures.
4 CitationsSource
#1T. Ehrich (University of Freiburg)H-Index: 3
#2S. Kühn (University of Freiburg)H-Index: 7
Last.Nicola ZorziH-Index: 25
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In this paper measurements of a 3D single-type column (3D-stc) microstrip silicon device are shown. The 3D-stc sensor has n-type columns in p-type substrate. It has been connected to an ATLAS SCT ABCD3T chip and is readout with ATLAS SCT electronics at 40 MHz. Spatial measurements were done with a laser setup to investigate the expected low field region in 3D devices. An influence of the p-stops on the collected charge has been observed.
16 CitationsSource
#1David Menichelli (UniFI: University of Florence)H-Index: 22
#2Mara Bruzzi (UniFI: University of Florence)H-Index: 30
Last.Antonio De Sio (UniFI: University of Florence)H-Index: 5
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Abstract Modern radiotherapy treatment techniques, such as intensity Modulated Radiation Therapy (IMRT) and protontherapy, require detectors with specific features, usually not available in conventional dosimeters. IMRT dose measurements, for instance, must face non-uniform beam fluences as well as a time-varying dose rate. Two-dimensional detectors present a great interest for dosimetry in beams with steep dose gradients, but they must satisfy a number of requirements and, in particular, they m...
23 CitationsSource
#1Sabina RonchinH-Index: 14
#2Maurizio BoscardinH-Index: 22
Last.Nicola ZorziH-Index: 25
view all 9 authors...
In the past two years, we have developed 3D detector technologies at ITC-irst (Trento, Italy). We have proposed a new 3D architecture, having columnar electrodes of one doping type only, allowing for a simplified fabrication process. In this paper, we report on preliminary results from the electrical characterization of devices irradiated with neutrons, showing that low depletion voltage values can be achieved even after very large fluences.
Silicon photo-multipliers (SiPM) consist in matrices of tiny, passive quenched avalanche photo-diode cells connected in parallel via integrated resistors and operated in Geiger mode. Novel types of SiPM are being developed at FBK-IRST (Trento, Italy). Despite their classical shallow junction n-on-p structure the devices are unique in their enhanced photo-detection efficiency (PDE) for short-wavelengths and in their low level of dark rate and excess noise factor. After a summary of the extensive ...
65 CitationsSource
#1Hf-W Sadrozinski (UCSC: University of California, Santa Cruz)H-Index: 111
#2Christopher Betancourt (UCSC: University of California, Santa Cruz)H-Index: 65
Last.N. MannaH-Index: 7
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Abstract Within the R&D Program for the luminosity upgrade proposed for the Large Hadron Collider (LHC), silicon strip detectors (SSD) and test structures (TS) were manufactured on several high-resistivity substrates: p-type Magnetic Czochralski (MCz) and Float Zone (FZ), and n-type FZ. To test total dose (TID) effects they were irradiated with 60 Co gammas and the impact of surface radiation damage on the detector properties was studied. Selected results from the pre-rad and post-rad characteri...
11 CitationsSource
Abstract We report on the processing and characterization of microstrip sensors and pad detectors produced on n- and p-type Magnetic Czochralski (MCz), Epitaxial (EPI) and Float Zone (FZ) silicon within the SMART project to develop radiation-hard silicon position sensitive detectors for future colliders. Each wafer contains 10 microstrip sensors with different geometries, several diodes and test structures. The isolation in the strip detectors produced on p-type material has been achieved by mea...
6 CitationsSource
#1M. Scaringella (UCSC: University of California, Santa Cruz)H-Index: 3
#2A. Polyakov (UCSC: University of California, Santa Cruz)H-Index: 2
Last.Gian-Franco Dalla Betta (University of Trento)H-Index: 27
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Abstract We report on charge collection studies on 3D silicon detectors of single-type column n-diffusions in p-substrate, configured either as strip or as pad detectors. The charge is generated by penetrating beta particles from a 90 Sr source which, together with a scintillation counter, serves as an electron telescope. The charge collection as a function of bias voltage is compared with the depletion thickness derived from the measured C – V characteristics.
13 CitationsSource
Because of their superior radiation resistance, three-dimensional (3D) silicon sensors are receiving more and more interest for application in the innermost layers of tracker systems for experiments running in very high luminosity colliders. Their short electrode distance allows for both a low depletion voltage and a high charge collection efficiency even at extremely high radiation fluences. In order to fully understand the properties of a 3D detector, a thorough characterization of the signal ...
14 CitationsSource