CODALEMA Experiment

Within the CODALEMA experiment framework which the LPSC joined in the year 2005, in association with the Subatech laboratory in Nantes, the SDI designed and deployed in autumn, 2005, a network of cosmic rays detections, composed of five stations of detectors with scintillators and photomultipliers. These detectors are had on both sides the network of décamétric antennas, exploited for the detection of the radio waves emitted by the cosmic sparks.

The acquisition system of these detectors is based, at the material point of view, MATACQ cards type VME, developped by the LAL and the IRFU (ex DAPNIA), so as to be able to become integrated into the system existing on the antenna network. The department implemented this acquisition and developed several programs under LabVIEW® allowing to get back and store data, to make an on-line control of the rates of events as well as the piloting of the photomultipliers high voltages.

By means of the IT service of the LPSC, an automatic backup system of the data was set up and checks it remotely. The experiment can be made in a way secured way through the Internet network.

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Planck Satellite

During year 2002, the prototype of the control system of the 20K cryo-generator of the Planck satellite , developped by the Jet Propulsion Laboratory (JPL), laboratory of the NASA of Pasadena, USA, was made.

Two campaigns of tests in 2002 and one in 2003 were necessary to qualify material and software aspects of this device. These tests took place in close collaborations with the electronics department of the LPSC. The prototype being directly connected to the cryo-generator prototype itself, on the JPL site. The SDI, which is responsible for a part of the technical project management, organized these tests as well as the associated procedures. we also assured the development and the implementation of of the command system and an interactive application under LabVIEW©, allowing to pilot the whole device by simulating the interfaces of the satellite.

These campaigns of check were a big success, demonstrating the sensible character of the solutions of design proposed by the laboratory as well as the smooth running of the communication between the teams of the LPSC and the JPL.

After a long period of definition of the characteristics and the interfaces, the prototype command system of the cryo-generator 100mK of the satellite could be made has the end of year 2003.

The tests of qualification of this system took place in the year 2004, on the site of Air Liquide of Sassenage, manufacturer of the cryo-generator. The SDI developed the control system and an application under LabVIEW©, capable of simulate the definitive piloting of the device (Data Processor Unit, DPU) developed by the LAL at Orsay.

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