Real time systems
Real time systems




The T2K experiment represents a particularly strong commitment from DAPNIA in the field of data acquisition. DAPNIA's area of responsibility covers all electronic elements of Micromega detectors equipping three Time Projection Chambers (TPC) and representing a total of 120,000 channels. This project relies particularly on DAPNIA expertise in analogical microelectronics and is based on a large skill base in systems architecture, the design of complex analogical and digital boards as well as encompassing the electrical, mechanical and thermal integration of these elements.
So far, the project has seen the installation and development of the acquisition system for the research experiment into dark matter ‘EDELWEISS2’ for an initial phase with 21 bolometers. Principal contributions from DAPNIA are the design and production of the electronics providing the global synchronization of the system, and the grouping of digital data, as well as the development of software providing real-time data acquisition, processing and storage.

 Based on an analogical memory developed in collaboration between IN2P3/LAL and DAPNIA, the MATACQ card digitizes analogical signals on a 12 bits dynamic range, at a frequency of 2 GHz. It is manufactured and sold under license by two industrial partners. One hundred copies of this card are currently used worldwide, mostly in research laboratories.



Electronics for space systems

DAPNIA is also developing electronic functions that are crucial for the implementation of innovative detection systems for scientific space instrumentation. These detection systems meet the diverse requirements of the various scientific subjects and cover the entire electromagnetic spectrum, from gamma, X, visible and infrared rays to submillimetric waves. Operating such detectors often requires using cryogenic devices and developing the associated electronics.
Developments conducted at DAPNIA as part of the HERSCHEL mission are a perfect illustration of these requirements. For example, the SPIRE instrument, an electronic unit including 350 ultra-low noise (a few nV/Hz1/2) channels and with a large dynamic range (20 bits) was designed in collaboration with the Jet Propulsion Laboratory, responsible for bolometer manufacturing. In the context of the PACS instrument, an analogical electronic system was developed to operate bolometer matrices produced by CEA/LETI. Apart from the 160 analogical processing channels, it includes polarization functions for the detector and the cryogenic system. Temperature measurements (10 µK resolution at 300 mK) were the subject of developments in collaboration with the low temperature department at DSM/DRFMC (Grenoble). To ensure effective communication between this unit and the rest of the instrument, an interface was integrated onto the ESA SpaceWire standard by DAPNIA and distributed in the PACS consortium. The electromagnetic compatibility of these units was validated in DAPNIA before final delivery.
Finally, DAPNIA teams are involved in new projects, such as the design and production of the scientific processing unit on the ECLAIRs satellite and for the high energy g-ray camera on the SIMBOL-X satellite.

#2249 - Last update : 10/23 2007


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