ATLAS : pre-sampler manufacturing:

Since November, 1991, date of group ATLAS (LHC-CERN) creation at LPSC, the SDI was involved at high level on the survey (R&D) and the manufacturing of the pre-sampler (front part) of the Liquid Argon electromagnetic calorimeter of ATLAS. This activity ended in 2003, after 3 years of production, tests and integration of 64 sectors.

This document redraws in image the history (from 1992 till 2003) of the construction and the insertion of pr-sampler.
 ATLAS Detector

HD Image of a pre-sampler sector:

presampler a3

HD Image of the M wheel and of 32 pre-sampler sector inserted in the crysotat:

roue M dans cryostat

Contact : Muraz Jean-François

Functional Tests

After Planck satellite control system prototype 20K cryo-generator (Sorption Coolers Electronic, SCE) tests successes in 2003, the manufacturing of the qualification and flight models were confided to EADS-CRISA (space industry), in Spain, at the beginning of 2004.

The delivery of the first qualification model (EQM) during the curse of 2004 permitted to realize the coupled tests with the flight cryo-generator at the end of the year, again on JPL's site, NASA laboratory at Pasadena, USA.

The department was responsible here for the organization of these tests as well as the software development of the tools of piloting and tests, developed under LabVIEW®. The realization of the it test first ones with the flight cryo-generator, led in close collaboration with the electronics department of the laboratory, were, even there, successful and allowed the development of the embedeed software for which the laboratory is responsible.

PLANCK1 54130055

The second qualification model ( CQM), identical in all to the future flight models but built with not spatial qualified components, was delivered to us at the beginning of year 2005. The department organized the second campaign of test at the JPL in spring, 2005, always coupled with the flight cryo-generator, just before its delivery in Europe. This last campaign in the USA allowed to test several specific procedures recently implemented in the embedeed software, among which the procedures of automatic covering of functioning error, necessary for enhanced reliability of the system during flight.

During the beginning of the first half of the year 2006, EADS-CRISA delivered three flight models of the electronic case SCE, two models which will be integrated on the satellite (FM1 and FM2) and an extra model (PFM). The SDI was responsible for the implementation and the execution of the functional tests on these cases, according to the current spatial quality plan, in the ESA standards.

These tests took place at the LPSC in clean room, until June, 2006, date in which the electronics FM1 and FM2 was delivered to the satellite's manufacturer (Thales Alenia Space in Cannes) for integration.

P6190003 PLANCK2

In parallel in these functional tests, a campaign of cryogenic validation tests took place in spring, 2006, implementing both flight Sorption Coolers, integrated on the Planck satellite model of qualification, associated to the case SCE of qualification (CQM) tested and delivered at the end of 2005. These tests took place over several weeks, at the Space Center of Liege ( CSL) in Belgium, and allowed to validate a part of the cryogenic aspects of Sorption Cooler and its control electronic housing.


At the end of the year on 2006, the qualification SCE housing was re-qualified in avionic housing (AVM) to be a part of avionic tests on a satellite's model. These tests, which focus essentially on the electric aspects of the satellite service module interface took place on several days, on Thales Alenia Space's site in Turin in Italy.

 IMG 1869

Finally, at the beginning of year 2007, again avionic tests took place, but this time by piloting the electronic housing from "Operating Center Mission" of the ESA (MOC), located in Darmstadt in Germany.

The SDI completely organized and widely participated in all these tests, both in the LPSC and on sites.

In 2008, the satellite is transferred on the Ariane Space's launch site at Kourou in Guiana. And even there, the SDI participates in the cryogenic tests and of pre-launch of the satellite.

After the satellite's launch, again, the department took an important part in the post-launch operations of Mission Operating Center (MOC) of the ESA, at Darmstadt in Germany.

Unit Testings

In parallel, during summer, 2004, an activity of test and systematic validation of the spatial embedeed software by the SCE began.
This process added to the development aims at enhancing reliability of the software in all its scales (unit functions, integrated modules and system on target). It requires the help of several testers, a strong implication of programmers and system engineers, and the use of a more familiar methodology from transport industry or defense than laboratories.

SDI, already strongly involved in the Planck systems test in the LPSC, was in charge of coordination and of project management of this work, at the boundary of the electronics, computing, system and test methods. A test team was established with persons of the various departments of the laboratory, but also researchers of the LPSC's Planck group.

A first iteration of unit testing was confided to a specialized provider, CAPTEC, recommended by the European Space agency. This major stage however showed its limits: indeed the later evolutions of the software questioned most of the validation obtained in this period, and then the provider restricted the field of his responsibilities to modules the test of which he mastered.

At the beginning of 2005, this service ended and the objective remained to finish the critical module delivery test, a "boot" software, which cannot be anymore modified once implanted in the electronics. The test software team took up this challenge by using partially the example and the previous results, for one somewhere else the expertise of the Computing Laboratory of Grenoble (LIG, ex LSR, laboratory Software Network Systems - INPG / UJF / CNRS), interested in our nitiative, and finally of a good dose of imagination and practical spirit.

Until September, 2005, two trainees of the LIG also made an important contribution by completing the unit testing on the "application" software part by means of the Cantata++© software. This last phase formally closed at the beginning of 2006, but the scripts and the tools of test will remain inseparable of the software during all the duration of its life.