Timepix, a 65k programmable pixel readout chip for arrival time, energy and/or photon counting measurements

Llopart, X.; Ballabriga, R.; Campbell, M.; Tlustos, Christina; Wong, Winnie

doi:10.1016/j.nima.2007.08.079

Cited by 913 publications

(701 citation statements)

References 9 publications

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“…The Timepix contains a matrix of semiconductor detectors -that is, pixels -and each pixel is able to measure the energy deposition in the "time-over-threshold" mode, where the charge collected in each pixel is recorded while the preamplifier output is over the threshold (Llopart et al, 2007); or each pixel can function simply as an event counter. Measurements are stored as a matrix containing information on the x-y location and energy deposition in each pixel (when an energy calibration is provided).…”

Section: Timepix Measurementmentioning

confidence: 99%

“…The Timepix chip used in this experiment is part of the Jablotron MX-10 unit, which is factory-calibrated and comes with calibration parameters that can be imported into the acquisition software (Pixelman: Turecek et al, 2011), so that particle energy can be registered. Prior to data acquisition, a threshold equalisation procedure (Llopart et al, 2007) is carried out to compensate for pixel-to-pixel variations, and dead pixels are masked to avoid over-response.…”

Section: Timepix Measurementmentioning

confidence: 99%

“…The Timepix hybrid-pixel detector, developed by the Medipix2 collaboration, consists of a pixelated semiconductor detector sensor coupled to the Timepix readout chip (Llopart et al, 2007;Jakůbek, 2009). The sensor is made of 300 μm-thick high resistivity silicon, which consists of 256 x 256 pixels, each with dimensions 55 x 55 μm.…”

Section: Introductionmentioning

confidence: 99%

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Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector

Romanyukha

Cunningham

George

et al. 2017

Radiation Measurements

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Luminescence dating methods currently allow for the evaluation of the distribution of equivalent dose (D e ) values for individual sand-sized grains of quartz and feldspar from a given sample, but the environmental dose rate is still derived from the bulk sample. Additionally, single-grain optically stimulated luminescence (OSL) dating is performed on disaggregated samples, resulting in the loss of micro-stratigraphic context. To enhance the interpretation of D e distributions, we aim to estimate the beta dose rate to sub-millimetre regions of intact samples using the Timepix pixelated semiconductor detector. The Timepix contains an array of 256 × 256 pixels, each 55 × 55 μm in size and with its own preamplifier, discriminator and digital counter. The detector has a total sensitive area of 1.98 cm 2 , and 65,536 independent channels. The output of each measurement is a matrix containing the position and pixel-by-pixel count rate (or deposited energy) of each particle that interacted in the sensitive volume of the detector. The main challenge in using the Timepix detector is low natural sample activity, and the goal of this work is to acquire data with minimal background contribution. With an experimental setup guided by Geant4 simulations, progress has been made to greatly reduce background noise using ad hoc shielding and post-acquisition particle analysis. We have established a Timepix measurement procedure applicable to resin-impregnated sediment samples, including sample preparation, measurement, and data processing and analysis. These steps have been tested on an artificial micro-stratified sample (composed of quartz and biotite grains held together by resin) to derive the corresponding spatially resolved beta dose rates. Disciplines Engineering | Science and Technology Studies Publication DetailsRomanyukha, A. A., Cunningham, A. C., George, S. P., Guatelli, S., Petasecca, M., Rosenfeld, A. B. & Roberts, R. G. (2017). Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector. Highlights• Timepix detector used to map beta dose rates in sediment • Geant4 simulations used to design measurement procedure • Method tested on an artificial micro-stratified sample • We show that natural dose rates can be mapped at sub-millimetre scales Abstract Luminescence dating methods currently allow for the evaluation of the distribution of equivalent dose (De) values for individual sand-sized grains of quartz and feldspar from a given sample, but the environmental dose rate is still derived from the bulk sample. Additionally, single-grain optically stimulated luminescence (OSL) dating is performed on disaggregated samples, resulting in the loss of micro-stratigraphic context. To enhance the interpretation of De distributions, we aim to estimate the beta dose rate to sub-millimetre regions of intact samples using the Timepix pixelated semiconductor detector. The Timepix contains an array of 256 x 256 pixels, each 55 x 55 μm in size and with its own preamplifier, discriminator and di...

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Section: Timepix Measurementmentioning

confidence: 99%

Section: Timepix Measurementmentioning

confidence: 99%

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Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector

Romanyukha

Cunningham

George

et al. 2017

Radiation Measurements

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“…Within the collaboration two technical solutions for the gas amplification are being pursued: gas electron multipliers (GEM) [3] and Micromegas [4]. They are combined with either a traditional pad-based readout, or with the direct readout by the Timepix chip [5]. In this paper, results are presented from a study of a prototype time projection chamber equipped with a GEM-based readout combined with a pad plane with pads of pitch size 1.26 mm × 5.85 mm.…”

Section: Introductionmentioning

confidence: 99%

A time projection chamber with GEM-based readout

Attié

Behnke

Bellerive

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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For the International Large Detector concept at the planned International Linear Collider, the use of time projection chambers (TPC) with micro-pattern gas detector readout as the main tracking detector is investigated. In this paper, results from a prototype TPC, placed in a 1 T solenoidal field and read out with three independent GEM-based readout modules, are reported. The TPC was exposed to a 6 GeV electron beam at the DESY II synchrotron. The efficiency for reconstructing hits, the measurement of the drift velocity, the space point resolution and the control of field inhomogeneities are presented.

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“…2 As an accurate knowledge of the projection center is necessary to calibrate the angular coordinates of the Kikuchi pattern on the detector screen, a key problem in EBSD is the determination of the exact position of the electron beam spot relative to the detector. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] We have previously used a digital hybrid pixel detector, Timepix, 20,21 in a SEM to obtain Kikuchi patterns from crystalline samples 22 by direct electron detection. Detailed investigations revealed that the Timepix detector response exhibits an underlying diffraction pattern even in the total absence of diffraction effects from the sample (see Fig.…”

mentioning

confidence: 99%

Diffractive triangulation of radiative point sources

Vespucci

Naresh-Kumar

Trager-Cowan

et al. 2017

Applied Physics Letters

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We describe a general method to determine the location of a point source of waves relative to a two-dimensional single-crystalline active pixel detector. Based on the inherent structural sensitivity of crystalline sensor materials, characteristic detector diffraction patterns can be used to triangulate the location of a wave emitter. The principle described here can be applied to various types of waves provided that the detector elements are suitably structured. As a prototypical practical application of the general detection principle, a digital hybrid pixel detector is used to localize a source of electrons for Kikuchi diffraction pattern measurements in the scanning electron microscope. This approach provides a promising alternative method to calibrate Kikuchi patterns for accurate measurements of microstructural crystal orientations, strains, and phase distributions

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Timepix, a 65k programmable pixel readout chip for arrival time, energy and/or photon counting measurements

Cited by 913 publications

References 9 publications

Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector

Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector

A time projection chamber with GEM-based readout

Diffractive triangulation of radiative point sources

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