R. Barthel's research while affiliated with Utrecht University and other places
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Publications (7)
The ITS3 upgrade baseline design employs MAPS (Monolithic Active Pixel Sensor) in bent state. Bending experiments with the existing ITS2 MAPS (=Alpide chip) show it remains functional but with relative large analog supply current changes. It is shown that by the piezoresistive effect, rotation of current mirror FETs can be responsible which was con...
We constructed a large-scale electromagnetic calorimeter prototype as a part of the Forward Calorimeter upgrade project (FoCal) for the ALICE experiment at the Large Hadron Collider (LHC). The prototype, also known as ``Mini FoCal'', consists of 20 layers of silicon pad sensors and tungsten alloy plates with printed circuit boards and readout elect...
The first evaluation of an ultra-high granularity digital electromagnetic calorimeter prototype using 1.0–5.8 GeV/c electrons is presented. The 25 × 10 ⁶ pixel detector consists of 24 layers of ALPIDE CMOS MAPS sensors, with a pitch of around 30 μm, and has a depth of almost 20 radiation lengths of tungsten absorber. Ultra-thin cables allow for a v...
A prototype of a new type of calorimeter has been designed and constructed, based on a silicon-tungsten sampling design using pixel sensors with digital readout. It makes use of the Alpide sensor developed for the ALICE Inner Tracking System (ITS) upgrade. A binary readout is possible due to the pixel size of ≈30×30μm2. This prototype has been succ...
![Figure 4: The EEEEEE-2 setup at the DESY II Test Beam Facility [17]...](publication/363331513/figure/fig2/AS:11431281083314766@1662520829468/The-EEEEEE-2-setup-at-the-DESY-II-Test-Beam-Facility-17-not-to-scale_Q320.jpg)
The first evaluation of an ultra-high granularity digital electromagnetic calorimeter prototype using 1.0-5.8 GeV/c electrons is presented. The $25\times10^6$ pixel detector consists of 24 layers of ALPIDE CMOS MAPS sensors, with a pitch of around 30~$\mu$m, and has a depth of almost 20 radiation lengths of tungsten absorber. Ultra-thin cables allo...
A prototype of a new type of calorimeter has been designed and constructed, based on a silicon-tungsten sampling design using pixel sensors with digital readout. It makes use of the Alpide MAPS sensor developed for the ALICE ITS upgrade. A binary readout is possible due to the pixel size of $\approx 30 \times 30 \, \mu \mathrm{m}^2$. This prototype...
![Fig. 1. [Top left] The single ALPIDE chip wire-bonded to a carrier card...](publication/335414097/figure/fig1/AS:863264179253250@1582829627966/Top-left-The-single-ALPIDE-chip-wire-bonded-to-a-carrier-card-and-coupled-to-the-DAQ_Q320.jpg)
Particle computed tomography (pCT) is an emerging imaging modality that promises to reduce range uncertainty in particle therapy. The Bergen pCT collaboration aims to develop a novel pCT prototype based on the ALPIDE monolithic CMOS sensor. The planned prototype consist of two tracking planes forming a rear tracker and Digital Tracking Calorimeter...
Citations
... A quick charge summation time targets the application in high-energy physics experiments such as proton-proton collisions at the Large Hadron Collider (LHC) with bunch crossings every 25 ns or at future colliders [7,8]. For other applications with lower readout frequencies digital calorimeter prototypes have already been built: For heavy ion collisions the FoCal calorimeter prototype relies on the ALPIDE sensor with charge summation time of 640 µs [9][10][11]. A detector for proton computed tomography [12] makes use of the same sensor. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/1181077884420098-1658602319962_Q64/Aart_Van_Bochove2.jpg)
... The epitaxial layers of the ALPIDE chips are modelled as single crystalSD volumes in GATE, so the positions and energy losses of all charged particles passing these volumes are recorded. Additional code converts these hits to clusters of pixels activated by electron diffusion around the track, whose size corresponds to the recorded energy loss (Tambave et al., 2020;Pettersen et al., 2019). Depending on the exact choice of parameters, about 100 protons pass through the DTC during one read-out cycle of the real detector. ...
