The Pixel-TPC: A feasibility study

Lupberger, M.

doi:10.1109/nssmic.2015.7581777

Cited by 8 publications

(9 citation statements)

References 53 publications

(97 reference statements)

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“…Throughout this text we will discuss as well the case of secondary scintillation: a process that relies on the ionization electrons being driven to a high field region, in which they can excite the medium and produce scintillation. 20 Very often, processes leading to primary scintillation (by the impinging particles) and secondary scintillation (by the ionization electrons) are, in fact, rather similar, in particular for noble gases. This may be counter-intuitive, since scintillation by a primary charged particle is largely a topdown process, that relies on the cascade of a relatively broad distribution of excited states; field-assisted scintillation by ionization electrons, on the other hand, is of the bottom-up type, leading to an overwhelming majority of low-lying excited states.…”

Section: Scintillation Mechanismsmentioning

confidence: 99%

“…Despite recent progress (e.g. [20]), such a fine sampling is still out of reach for contemporary TPCs used at colliders, given the large dimensions involved. The position resolution on the other hand (that is, the precision with which the barycenter of a portion of the track can be reconstructed), can reach similar levels in both types of TPCs, meaning that they will recover each track's geometrical information with a comparable performance.…”

Section: Introductionmentioning

confidence: 99%

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Gaseous and dual-phase time projection chambers for imaging rare processes

González-Díaz

Monrabal

Murphy

2018

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Scintillation Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gaseous and dual-phase time projection chambers for imaging rare processes

González-Díaz

Monrabal

Murphy

2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…The front end card features a Virtex-6 FPGA [29], which hosts the state machine for the slow control and the data acquisition and zero-suppression unit. The system is run by the TimePix Operation Firmware (TOF), which communicates with the computer via GBit Ethernet by the TimePix Operation Software (TOS), both currently under development [30] at the Physikalisches Institut Bonn for next-generation Time Projection Chamber instrumentation [31]. Additionally the system is equipped with an external post mortem trigger, which consists of an amplifier connected to the grid, a discriminator and a microcontroller which closes the shutter after a given time after the first event.…”

Section: Data Acquisitionmentioning

confidence: 99%

Novel neutron detectors based on the time projection method

Köhli

Desch

Gruber

et al. 2018

Physica B: Condensed Matter

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We present the first prototype of a novel thermal neutron detector using the time projection method. The system consists of 8 TimePix ASICS with postprocessed InGrid meshes. Each ASIC has 256 × 256 pixels of 55 µm×55 µm in size with the capability to measure charge or time. This allows to visualize entire conversion particle tracks with their spatial and time information and, by using event reconstruction algorithms, discriminate against the background of others. By using the Scalable Readout System the detector as presented here could also be upscaled to much larger active areas. In the current configuration we could achieve a spatial resolution of σ = (115 ± 8) µm.

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“…GridPix, one of the candidate readout systems for the TPC, is a combination of a micropattern gaseous detector with a TimePix chip readout system [2] [3]. The result of this combination is that there are many individual hits along a track (around 100 per cm).…”

Section: Introductionmentioning

confidence: 99%

“…The size of each pixel is 55 x 55 μm 2 and in each chip, there are 256 x 256 pixels. Every 8 GridPix chips are aligned in a structure called Octoboard [2]. One of the main reasons to use GridPix is to reach the highest possible double track resolution for the ILD-TPC.…”

Section: Introductionmentioning

confidence: 99%

Bivariate normal distribution for finding inliers in Hough space for a Time Projection Chamber

Shirazi

Fleck

2017

EPJ Web Conf.

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A Time Projection Chamber (TPC) is foreseen as the main tracking detector for the International Large Detector (ILD), one of the two detectors for the next candidate collider named International Linear Collider (ILC) [1]. GridPix, a combination of a micropattern gaseous detector with a pixelized readout, is one of the candidate readout systems for the TPC [2] [3]. One of the challenges in the track reconstruction is the large number of individual hits along a track (around 100 per cm). Due to the small pixel size of 55 x 55 μm 2 , the distance between the individual ionization processes in the gas is larger than the size of the pixels. Consequently, the hits in the GridPix are not contiguous. This leads to the challenge of assigning the individual hits to the correct track. Hits within a given distance from a reconstructed track are called inliers. Consequently, finding inliers within the large number of hits and in the presence of noise is difficult for pattern recognition. This difficulty is increased by diffusion effects in the TPC. One of the current algorithms which are utilized for track finding is the Hough transform. Using a bivariate normal distribution based on the covariance matrix calculated from the diffusion effect improves collecting inliers in the Hough space directly [5].

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The Pixel-TPC: A feasibility study

Cited by 8 publications

References 53 publications

Gaseous and dual-phase time projection chambers for imaging rare processes

Gaseous and dual-phase time projection chambers for imaging rare processes

Novel neutron detectors based on the time projection method

Bivariate normal distribution for finding inliers in Hough space for a Time Projection Chamber

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