2D PET backprojection acceleration through a 2D predictive cache

Reduction of image reconstruction time is a key point for the development and spreading of PET scans. Thus this article presentes a hardware/software architecture which aims at accelerating the 2D reconstruction on a SoPC (System on Programmable Chip) plateform, the new generation of reconfigurable chip. Issue posed by the latency of memory accesses has been solved thanks to the 2D Aptative and Predictive cache (2D-AP cache).Le développement et la diffusion des équipements TEP passent par la réduction des temps de calcul de la reconstruction des images acquises. Aussi cet article présente une solution mixte logicielle/matérielle pour l'accélération de la reconstruction 2D sur une plateforme SOPC (System on Programmable Chip), la nouvelle génération de circuits reconfigurables. Le verrou technologique posé par la latence des accès mémoire est levé grâce au cache 2D Adaptatif et Prédictif (cache 2D-AP)

Lumped Element Kinetic Inductance Detectors for space applications

Kinetic Inductance Detectors (KID) are now routinely used in ground-based telescopes. Large arrays, deployed in formats up to kilopixels, exhibit state-of-the-art performance at millimeter (e.g. 120-300 GHz, NIKA and NIKA2 on the IRAM 30-meters) and sub-millimeter (e.g. 350-850 GHz AMKID on APEX) wavelengths. In view of future utilizations above the atmosphere, we have studied in detail the interaction of ionizing particles with LEKID (Lumped Element KID) arrays. We have constructed a dedicated cryogenic setup that allows to reproduce the typical observing conditions of a space-borne observatory. We will report the details and conclusions from a number of measurements. We give a brief description of our short term project, consisting in flying LEKID on a stratospheric balloon named B-SIDE.Comment: To appear in the SPIE 2016 Proceeding

Tests at 2K of the beta 0.35 spoke cryomodule prototype with the MTCA.4-based Low Level RF system prototype for the MYRRHA R&D

Within the framework of the first phase of MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) project, called MINERVA, IJCLab was in charge of a fully equipped Spoke cryomodule prototype development, tested at 2K. It integrates two superconducting single spoke cavities, the RF power couplers and the Cold Tuning Systems associated. On the control side, a MTCA.4-based Low Level Radio Frequency (LLRF) system prototype and the Software/EPICS developments has been realized by IJCLab and the SCK CEN in collaboration with the company IOxOS Technologies. The final version of the global system and the results of the tests at 2K will show with some perspectives.Comment: Poster pr\'esent\'e au LLRF Workshop 2023 (LLRF2023, arXiv : 2310.03199

Modeling and Analysis of Digital-to-Analog Converter Non-Idealities in Microwave Kinetic Inductance Detectors Readout

International audienceThe Microwave Kinetic Inductance Detector (MKID) is a millimeter-wave-length light detector made with a radiofrequency superconductor resonator that exhibits the characteristic of high resonance quality factor (Q), enabling the multiplexing of hundreds of MKIDs on a single signal transmission line. In this study, we investigate the Digital-to-Analog Converter (DAC) of the current readout solution. Specifically, we developed a functional model of the DAC, including its slew rate and saturation limitations, and demonstrated its validity by comparing it with measurement results. This model allows to analyze the influence of the DAC's limitations across the entire frequency spectrum, and to examine its impact on the maximum frequency multiplexing factor. We demonstrate that the non-idealities of the DAC limit the maximum frequency multiplexing factor, which depends on the number of sinusoids, their amplitude, and phase

General practice undergraduate and vocational training: ambulatory teaching and trainers’ curriculum and remuneration – a cross-sectional study among 30 member countries of WONCA Europe

International audienceBackground: After a long phase without any propositions for real ambulatory training inside general practitioners’ offices, general practice (GP) vocational training has begun to appear progressively and has been integrated into undergraduate medical programmes. The aim of this study was to provide an overview of GP vocational training and GP trainers in member countries of the World Organization of National Colleges, Academies and Academic Associations of General Practitioners/Family Physicians (WONCA) Europe. Method: We carried out this cross-sectional study between September 2018 and March 2020. The participants responded to a questionnaire in real-life conversations, video conferences or e-mail exchanges. The respondents included GP trainers, teachers and general practitioners involved in the GP curriculum recruited during European GP congresses. Results: Representatives from 30 out of 45 WONCA Europe member countries responded to the questionnaire. Based on their responses, there is a well-established period for GP internships in undergraduate medical programmes, but with varying lengths. The programmes for some countries offer an internship after students graduate from medical school but before GP specialisation to ensure the career choice of the trainees. After specialisation, private practice GP internships are offered; however, in-hospital GP internships are more common. GP trainees no longer have a passive role during their internships. GP trainers are selected based on specific criteria and in countries, they have to follow some teacher training programmes. In addition to income from medical appointments carried out by GP trainees, GP trainers from some countries receive additional remuneration from various organisations. Conclusion: This study collected information on how undergraduate and postgraduate medical students are exposed to GP, how GP training is organised and the actual status of GP trainers among WONCA Europe member countries. Our exploration of GP training provides an update of the data collected by Isabel Santos and Vitor Ramos in the 1990s and describes some specificities that can inspire other organisations to prepare young, highly qualified general practitioners

Kinetic inductance detectors for millimeter and submillimeter astronomy / D\'etecteurs \`a inductance cin\'etique pour l'astronomie millim\'etrique et sub-millim\'etrique

We present recent developments in Kinetic Inductance Detectors (KID) for large arrays of detectors. The main application is ground-based millimeter wave astronomy. We focus in particular, as a case study, on our own experiment: NIKA (N\'eel IRAM KID Arrays). NIKA is today the best in-the-field experiment using KID-based instruments, and consists of a dual-band imaging system designed for the IRAM 30 meter telescope at Pico Veleta. We describe in this article, after a general context introduction, the KID working principle and the readout electronics, crucial to take advantage of the intrinsic KID multiplexability. We conclude with a small subset of the astronomical sources observed simultaneously at 2 mm and 1.4 mm by NIKA during the last run, held in October 2010. Nous d\'ecrivons les r\'ecents d\'eveloppements concernant les grandes matrices de d\'etecteurs \`a inductance cin\'etique (KID) dont l'application principale est l'astronomie millim\'etrique au sol. Nous d\'etaillons en particulier notre propre cam\'era : NIKA (N\'eel IRAM KID Arrays) qui est aujourd'hui l'instrument le plus abouti mettant en oeuvre des KIDs. NIKA est une cam\'era bi-bande con\c{c}ue pour le radiot\'elescope de 30 m\`etres de l'IRAM \`a Pico Veleta. Apr\'es avoir d\'ecrit le contexte instrumental dans lequel ils s'inscrivent, nous expliquerons le principe de fonctionnement des KIDs et de leur \'electronique de lecture, cruciale pour pouvoir tirer parti de leur potentiel de muliplexage. Pour finir, nous pr\'esentons quelques exemples d'observations effectu\'ees par NIKA dans les bandes de 2 mm et 1,4 mm au cours de la derni\`ere campagne d'observation en octobre 2010.Comment: Withdrawn, will be resubmitted with a new list of author

The PolarKID project: polarization measurements with KIDs for the next generation of CMB telescopes

International audienceThe goal of the PolarKID project is testing a new method for the measurement of polarized sources, in order to identify all the possible instrumental systematic effects that could impact the detection of CMB B-modes of polarization. It employs the KISS (KIDs Interferometer Spectrum Survey) instrument coupled to a sky simulator and to sources such as point-like black bodies (simulating planets), a dipole (extended source) and a polarizer. We use filled-arrays Lumped Element Kinetic Inductance Detectors (LEKIDs) since they have multiple advantages when observing both in a photometry and in a polarimetry configuratio

CONCERTO : Digital processing for finding and tuning LEKIDs

We describe the on-line algorithms developed to probe Lumped Element Kinetic Inductance Detectors (LEKID) in this paper. LEKIDs are millimeter wavelength detectors for astronomy. LEKID arrays are currently operated in different instruments as: NIKA2 at the IRAM telescope in Spain, KISS at the Teide Observatory telescope in Tenerife, and CONCERTO at the APEX 12-meter telescope in Chile. LEKIDs are superconducting microwave resonators able to detect the incoming light at millimeter wavelengths and they are well adapted for frequency multiplexing (currently up to 360 pixels on a single microwave guide). Nevertheless, their use for astronomical observations requires specific readout and acquisition systems both to deal with the instrumental and multiplexing complexity, and to adapt to the observational requirements (e.g. fast sampling rate, background variations, on-line calibration, photometric accuracy, etc). This paper presents the different steps of treatment from identifying the resonance frequency of each LEKID to the continuous automatic control of drifting LEKID resonance frequencies induced by background variations