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1.
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Ionizing Energy Depositions After Fast Neutron Interactions in Silicon
/ Bergmann, Benedikt (IEAP CTU, Prague) ; Pospisil, Stanislav (IEAP CTU, Prague) ; Caicedo, Ivan (IEAP CTU, Prague) ; Kierstead, James (Brookhaven) ; Takai, Helio (Brookhaven) ; Frojdh, Erik (CERN)
In this study we present the ionizing energy depositions in a 300 μm thick silicon layer after fast neutron impact. With the Time-of-Flight (ToF) technique, the ionizing energy deposition spectra of recoil silicons and secondary charged particles were assigned to (quasi-)monoenergetic neutron energies in the range from 180 keV to hundreds of MeV. [...]
2016
- Published in : IEEE Trans. Nucl. Sci. 63 (2016) 2372-2378
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2.
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Towards a new generation of pixel detector readout chips
/ Campbell, M (CERN) ; Alozy, J. (CERN) ; Ballabriga, R. (CERN) ; Frojdh, E. (CERN ; Mid Sweden U., Sundsvall) ; Heijne, E. (CERN ; IEAP CTU, Prague) ; Llopart, X. (CERN) ; Poikela, T. (CERN) ; Tlustos, L. (CERN ; Freiburg U.) ; Valerio, P. (CERN) ; Wong, W. (CERN ; Houston U.)
The Medipix3 Collaboration has broken new ground in spectroscopic X-ray imaging and in single particle detection and tracking. This paper will review briefly the performance and limitations of the present generation of pixel detector readout chips developed by the Collaboration. [...]
2016
- Published in : JINST 11 (2016) C01007
IOP Open Access article: PDF;
In : 17th International Workshop on Radiation Imaging Detectors, Hamburg, Germany, 28 Jun - 02 Jul 2015, pp.C01007
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3.
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Readout cross-talk for alpha-particle measurements in a pixelated sensor system
/ Norlin, B (Mid Sweden U., Sundsvall) ; Reza, S (Mid Sweden U., Sundsvall) ; Krapohl, D (Mid Sweden U., Sundsvall) ; Fröjdh, E (CERN ; Mid Sweden U., Sundsvall) ; Thungström, G (Mid Sweden U., Sundsvall)
Simulations in Medici are performed to quantify crosstalk and charge sharing in a hybrid pixelated silicon detector. Crosstalk and charge sharing degrades the spatial and spectral resolution of single photon processing X-ray imaging systems. [...]
2015 - 12 p.
- Published in : JINST 10 (2015) C05025
IOP Open Access article: PDF;
In : 16th International Workshop on Radiation Imaging Detectors, Trieste, Italy, 22 - 26 Jun 2014, pp.C05025
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4.
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Equalization method for Medipix3RX
/ Rinkel, Jean (LNLS, Campinas) ; Magalhães, Debora (LNLS, Campinas) ; Wagner, Franz (LNLS, Campinas) ; Frojdh, Erik (CERN) ; Ballabriga Sune, Rafael (CERN)
This paper describes a new method of threshold equalization for X-ray detectors based on the Medipix3RX ASIC, using electrical pulses to calibrate and correct for the threshold dispersion between pixels. This method involves a coarse threshold tuning, based on two 8 bits global DACs and which sets the range of variation of the threshold values; and a fine-tuning, based on two 5-bits adjustment DACs per pixel. [...]
2015
- Published in : Nucl. Instrum. Methods Phys. Res., A 801 (2015) 1-6
Elsevier Open Access article: PDF;
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5.
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Spectral response of the energy-binning Dosepix ASIC coupled to a 300 μm silicon sensor under high fluxes of synchrotron radiation
/ Fröjdh, E (CERN ; Mid Sweden U., Sundsvall) ; Bisello, F ; Campbell, M (CERN) ; Damet, J (CERN) ; Hamann, E (Forschungszentrum Karlsruhe, ANKA) ; Koenig, T (Forschungszentrum Karlsruhe, ANKA) ; Wong, W S ; Zuber, M (Forschungszentrum Karlsruhe, ANKA)
The Dosepix hybrid pixel detector was designed for dosimetry and radiation monitoring applications. It has three programmable modes of operation: photon counting mode, energy integration mode, and dosimetry mode. [...]
2015 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 804 (2015) 43-49
Elsevier Open Access article: PDF;
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6.
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Timepix3: first measurements and characterization of a hybrid-pixel detector working in event driven mode
/ Frojdh, E (CERN ; Mid Sweden U., Sundsvall) ; Campbell, M (CERN) ; Gaspari, M De (CERN) ; Kulis, S (CERN) ; Llopart, X (CERN) ; Poikela, T (Mid Sweden U., Sundsvall ; TUCS, Turku) ; Tlustos, L (CERN ; Freiburg U.)
Timepix3 is a hybrid pixel detector readout chip. It features a data driven readout mode where the chip sends out a data packet containing pixel coordinate, time over threshold and time of arrival immediately after the hit is processed by the pixel. [...]
2015 - 9 p.
- Published in : JINST 10 (2015) C01039
In : 16th International Workshop on Radiation Imaging Detectors, Trieste, Italy, 22 - 26 Jun 2014, pp.C01039
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7.
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8.
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Review of hybrid pixel detector readout ASICs for spectroscopic X-ray imaging
/ Ballabriga, R (CERN) ; Alozy, J (CERN) ; Campbell, M (CERN) ; Frojdh, E (CERN) ; Heijne, E H M (CERN ; IEAP CTU, Prague) ; Koenig, T (KIT, Karlsruhe) ; Llopart, X (CERN) ; Marchal, J (Diamond Light Source) ; Pennicard, D (DESY) ; Poikela, T (CERN) et al.
Semiconductor detector readout chips with pulse processing electronics have made possible spectroscopic X-ray imaging, bringing an improvement in the overall image quality and, in the case of medical imaging, a reduction in the X-ray dose delivered to the patient. In this contribution we review the state of the art in semiconductor-detector readout ASICs for spectroscopic X-ray imaging with emphasis on hybrid pixel detector technology. [...]
2016 - 34 p.
- Published in : JINST 11 (2016) P01007
IOP Open Access article: PDF;
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9.
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A Geant4 based framework for pixel detector simulation
/ Schübel, A ; Krapohl, D ; Fröjdh, E (CERN) ; Fröjdh, C ; Thungström, G
The output from a hybrid pixel detector depends on the interaction of the radiation with the sensor material, the transport of the resulting charge in the sensor, the pulse processing in the readout circuit and processing of the resulting signal. In order to understand the full behaviour of the device and to predict the performance of future devices it is important to have a framework that can simulate the entire process in the detector system. [...]
2014
- Published in : JINST 9 (2014) C12018
In : 16th International Workshop on Radiation Imaging Detectors, Trieste, Italy, 22 - 26 Jun 2014, pp.C12018
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10.
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Design of the analog front-end for the Timepix3 and Smallpix hybrid pixel detectors in 130 nm CMOS technology
/ Gaspari, M De (CERN) ; Alozy, J (CERN) ; Ballabriga, R (CERN) ; Campbell, M (CERN) ; Fröjdh, E (CERN) ; Idarraga, J (CERN) ; Kulis, S (CERN) ; Llopart, X (CERN) ; Poikela, T (CERN) ; Valerio, P (CERN) et al.
This paper describes a front-end for hybrid pixel readout chips, which was developed for the Timepix3 and Smallpix ASICs. The front-end contains a single-ended preamplifier with a structure for leakage current compensation which can handle both signal polarities, and a single-threshold discriminator with compensation for pixel-to-pixel mismatch. [...]
2014
- Published in : JINST 9 (2014) C01037
Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Perugia, Italy, 23 - 27 Sep 2013, pp.C01037
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