Performance of a GridPix detector based on the Timepix3 chip Ligtenberg, C.; Heijhoff, K.; Bilevych, Y. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2018, Letnik:
908
Journal Article
Recenzirano
Odprti dostop
A GridPix readout for a TPC based on the Timepix3 chip is developed for future applications at a linear collider. The GridPix detector consists of a gaseous drift volume read out by a single Timepix3 ...chip with an integrated amplification grid. Its performance is studied in a test beam with 2.5 GeV electrons. The GridPix detector detects single ionization electrons with high efficiency. The Timepix3 chip allowed for high sample rates and time walk corrections. Diffusion is found to be the dominating error on the track position measurement both in the pixel plane and in the drift direction, and systematic distortions in the pixel plane are below 10 μm. Using a truncated sum, an energy loss (dE/dx) resolution of 4.1% is found for an effective track length of 1 m.
New results from GridPix Detectors Bilevych, Y; Desch, K; Fransen, J-P ...
Journal of physics. Conference series,
04/2020, Letnik:
1498, Številka:
1
Journal Article
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GridPix structures combine the high resolution of a pixel readout chip with a Micromegas as gas amplification stage. This detector has shown excellent performance before with the Timepix ASIC, but ...has been improved by using the successor ASIC, the Timepix3. This new version of the GridPix detectors has been used in test beams at the ELSA accelerator at Bonn, where 2.5 GeV electrons are available for tracking studies. It could be demonstrated that the spatial resolution in both transverse and longitudinal direction follows the diffusion function. Structures made of four GridPixes have been designed and constructed to cover larger areas. Also these devices called quads have been successfully tested with the electron beam giving similarly good results as the single GridPix detector.
GridPix detectors: Production and beam test results Koppert, W.J.C.; van Bakel, N.; Bilevych, Y. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2013, Letnik:
732
Journal Article
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The innovative GridPix detector is a Time Projection Chamber (TPC) that is read out with a Timepix-1 pixel chip. By using wafer post-processing techniques an aluminium grid is placed on top of the ...chip. When operated, the electric field between the grid and the chip is sufficient to create electron induced avalanches which are detected by the pixels. The time-to-digital converter (TDC) records the drift time enabling the reconstruction of high precision 3D track segments. Recently GridPixes were produced on full wafer scale, to meet the demand for more reliable and cheaper devices in large quantities. In a recent beam test the contribution of both diffusion and time walk to the spatial and angular resolutions of a GridPix detector with a 1.2mm drift gap are studied in detail. In addition long term tests show that in a significant fraction of the chips the protection layer successfully quenches discharges, preventing harm to the chip.
Tracking performance of GasPixel detectors in test beam studies Boldyrev, A.S.; Hartjes, F.; Hessey, N.P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2016, Letnik:
807
Journal Article
Recenzirano
A combination of a pixel chip and a gas chamber (GasPixel detectors) opens new opportunities for particle detectors. GasPixel detectors consist of an electron drift volume, an amplification gap and ...an anode plane based on a semiconductor chip. This technology promises large benefits in high-energy charged-particle tracking. It allows reconstruction of a 3D image of a particle track segment in a single detector layer with high accuracy. Several prototypes of GasPixel detectors based on micromegas technology with different gas mixtures and drift gaps were studied in a test beam. A spatial resolution of 8μm and angular accuracy of about 0.2° in a chip plane were obtained. A dedicated Monte Carlo simulation of GasPixel detectors shows good agreement with experimental data.
In this work we report electrical characterizations on heavily irradiated epitaxial 4H-SiC Schottky diodes. Even after an irradiation at a fluence of
1.4
×
10
16
p
/
cm
2
and
7
×
10
15
n
/
cm
2
, we ...found the diodes still able to detect
α
and
β
particles with a charge collection efficiency (CCE) ranging from 25 to 30% after proton irradiation and about 18% after neutron irradiation, at the highest reverse bias applied. This corresponds to a charge collection distance (CCD) of
7
μ
m
after the proton irradiation and
5
μ
m
after the neutron irradiation. As the irradiation level approaches the range
∼
10
15
/
cm
2
, the material behaves as intrinsic due to a very high compensation effect.
A combination of a pixel chip and a gas chamber opens new opportunities for particle detectors. These “GasPix” detectors have vector tracking features offering at the same time a L1 track trigger and ...a particle identification using transition radiation and dE/dX measurements. Test-beam and MC studies of tracking and particle identification properties have been performed with a GasPix prototype. The properties of the detector very much depend on the gas mixture. For one layer of the GasPix detector one can obtain a spatial accuracy down to 11μm and a vector angular accuracy of about 10mrad for a beam incident angle of 10°. For particle identification studies the detector was filled with a Xe/CO2 (70/30) mixture. A block of transition radiation radiator of 19cm was installed in front of the detector. The pion rejection power using both cluster counting and full dE/dX methods was studied. It was shown that for 5GeV particles a single layer of the detector gives a pion suppression by about a factor of 7at an electron efficiency of 90%. Two layers of this detector provide a pion rejection factor of 50 at 90% electron efficiency. A comparison of the data and MC results is presented.
Moisture sensitivity of AC-coupled silicon strip sensors Hartjes, F.G.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2005, Letnik:
552, Številka:
1
Journal Article
Recenzirano
A study is presented on the
I–
V behaviour of a part of the AC-coupled silicon strip sensors used in the ATLAS semiconductor tracker (SCT) at the LHC. For these sensors the metal strips are narrower ...than the implants while for the majority of the SCT sensors the strips are wider than the implants (fieldplate layout). The
I–
V curves of these sensors show an early
I–
V breakdown in a dry environment that did not occur at the
I–
V test by the manufacturer done under normal laboratory conditions. The breakdown behaviour was not observed at the sensors with the fieldplate layout. In this paper the dependence of the breakdown on the environmental moisture level will be described and a possible explanation will be given that is based on the detector layout. It will also be shown that the breakdown behaviour does not cause operational problems for the SCT.
We investigated the charge collection properties of a polycrystalline CVD diamond detector in a temperature range from
-
10
to
80
∘
C
, by means of a
90Sr minimum ionizing
β
radiation source. The ...sample is a state-of-the-art diamond sensor yielding a maximum charge collection distance of
260
μ
m
at room temperature and
1
V
/
μ
m
applied field, when set in the so called pumped state, i.e., after passivating the deep traps with a pre-irradiation with
β
particles. We observed a decreasing charge collection distance with increasing temperature, which is a trend opposite to that reported recently by other research groups. We ascribe this discrepancy to the higher quality of our detector, in terms of a lower concentration of defects and grain boundaries. Conversely, we observe a less dramatic temperature dependence which we tentatively explain assuming a combined effect of variation with temperature of the thermal velocity and of the capture cross-section, according to a well known model of multi-phonon non-radiative processes.
On the properties of a negative-ion TPC prototype with GridPix readout Ligtenberg, C.; van Beuzekom, M.; Bilevych, Y. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2021, Letnik:
1014
Journal Article
Recenzirano
Odprti dostop
The performance of a GridPix detector to read out a negative ion TPC was studied using a module with four GridPix chips that are based on the Timepix3 pixelated readout ASIC. The quad module ...dimensions are 39.6mm×28.38mm, and the maximum drift distance is 40mm. The TPC is operated using a 93.6/5.0/1.4 gas mixture (by volume) of Ar/iC4H10/CS2 with a small amount of oxygen and water vapour at a pressure of 1030mbar and a temperature of 297K. Tracks were produced by a pulsed N2 laser. The GridPix chips are sensitive to single drift ions, and allow for the determination of the drift distance using the velocities of the different ion species. The 1.56ns time resolution of the Timepix3 chips allows for a precise determination of the drift properties in the longitudinal direction. The measured mobility of majority ion charge carriers is (1.391±0003) cm2/V/s. Using the high granularity pixel readout, the transverse and longitudinal diffusion coefficients were measured to correspond to an effective thermal diffusion temperature of 314 K and 384 K respectively. For 429 detected ions, the precision on the absolute drift distance is expected to be 1.33mm for a mean drift distance of 20mm.
Performance of the GridPix detector quad Ligtenberg, C.; Bilevych, Y.; Desch, K. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2020, Letnik:
956
Journal Article
Recenzirano
Odprti dostop
A gaseous pixel readout module with four GridPix chips, called the quad, has been developed as a building block for a large time projection chamber readout plane. The quad module has dimensions ...39.6mm×28.38mm and an active surface coverage of 68.9%. The GridPix chip consists of a Timepix3 chip with integrated amplification grid and have a high efficiency to detect single ionization electrons, which enable to make a precise track position measurement. A quad module was installed in a small time projection chamber and measurements of 2.5GeV electrons were performed at the ELSA accelerator in Bonn, where a silicon telescope was used to provide a reference track. The error on the track position measurement, both in the pixel plane and drift direction, is dominated by diffusion. The quad was designed to have minimum electrical field inhomogeneities and distortions, achieving systematics of better than 13µm in the pixel plane. The resolution of the setup is 41µm, where the total systematic error of the quad detector is 24µm.
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