The RD53A is a prototype of the readout chip that will be used in the Compact Muon Solenoid (CMS) pixel detector after the High-Lumi LHC (HL-LHC) upgrade is complete beyond 2025. A new feature of the ...chip enables the writing of configuration commands between triggers during operation. This feature can be used to compensate for a detuning of the pixels due to radiation damage or temperature fluctuations over time. This paper studies the efficiency of such a method as well as its side-effects and the dependency on its parameters using an equivalent software implementation.
Towards third generation pixel readout chips Garcia-Sciveres, M.; Mekkaoui, A.; Ganani, D.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2013, Letnik:
731
Journal Article
Recenzirano
We present concepts and prototyping results towards a third generation pixel readout chip. We consider the 130nm feature size FE-I4 chip, in production for the ATLAS IBL upgrade, to be a second ...generation chip. A third generation chip would have to go significantly further. A possible direction is to make the IC design generic so that different experiments can configure it to meet significantly different requirements, without the need for everybody to develop their own ASIC from the ground up. In terms of target technology, a demonstrator 500-pixel matrix containing analog front ends only (no complex functionality), was designed and fabricated in 65nm CMOS and irradiated with protons in December 2011 and May 2012.
We report on the design, production, and performance of compact 40-cm3 Time Projection Chambers (TPCs) that detect fast neutrons by measuring the three-dimensional (3D) ionization distribution of ...nuclear recoils in 4He:CO2 gas at atmospheric pressure. We use these detectors to characterize the fast-neutron flux inside the Belle II detector at the SuperKEKB electron–positron collider in Tsukuba, Japan, where the primary design constraint is a small form factor. We find that the TPCs meet or exceed all design specifications, and are capable of measuring the 3D surface shape and charge density profile of ionization clouds from nuclear recoils and charged tracks in exquisite detail. Scaled-up detectors based on the detection principle demonstrated here may be suitable for directional dark matter searches, measurements of coherent neutrino–nucleus scattering, and other experiments requiring precise detection of neutrons or nuclear recoils.
Tests of gases in a mini-TPC with pixel chip readout Vahsen, S.; Oliver-Mallory, K.; Lopez-Thibodeaux, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2014, Letnik:
738
Journal Article
Recenzirano
Gases for potential use as targets for directional dark matter detection were tested in a prototype detector using two sequential Gas Electron Multipliers, or GEMs. The sensitive volume consists of a ...mini-TPC of 12cm length and 7.5cm diameter. An FEI3 pixel chip, developed for the ATLAS experiment, was used to produce spatial measurements with high resolution. An Fe55 source produced photoelectrons by X-ray conversions in the sensitive volume, and images of these were recorded by the chip. Spatial resolution plots are shown for the gases, which include the practical electron range of the photoelectrons and the effects of diffusion in the mini-TPC. Avalanche gain and gain resolution measurements were made for the four gases tested, at atmospheric and sub-atmospheric pressures: Ar(70)/CO2(30), CF4, He(80)/CF4(20) and He(80)/isobutane(20).
Following the advent of a post-Moore's law field of computation, novel architectures continue to emerge. With composite, multi-million connection neuromorphic chips like IBM's TrueNorth, neural ...engineering has now become a feasible technology in this novel computing paradigm. High Energy Physics experiments are continuously exploring new methods of computation and data handling, including neuromorphic, to support the growing challenges of the field and be prepared for future commodity computing trends. This work details the first instance of a Kalman filter implementation in IBM's neuromorphic architecture, TrueNorth, for both parallel and serial spike trains. The implementation is tested on multiple simulated systems and its performance is evaluated with respect to an equivalent non-spiking Kalman filter. The limits of the implementation are explored whilst varying the size of weight and threshold registers, the number of spikes used to encode a state, size of neuron block for spatial encoding, and neuron potential reset schemes.
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