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Portal > Offres > Offre UMR7178-REGSOM-027 - H/F Chercheur en physique des particules

M/W Researcher in particle physics

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Français - Anglais

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General information

Reference : UMR7178-REGSOM-027
Workplace : STRASBOURG
Date of publication : Monday, August 12, 2019
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 October 2019
Proportion of work : Full time
Remuneration : From 2643,32 euros gross per month according to experience
Desired level of education : PhD
Experience required : Indifferent


Supervise beam tests at the laboratory for the new silicon modules of the upgraded CMS tracker; responsibility of the running of the associated telescope; data analysis, calibration and qualification measurements of the modules; participation possible to the physics analyses of the group, including search for new particles with a long lifetime.


• Installation and operation of a telescope on the proton beam line of the CYRCé cyclotron at IPHC, calibration and tests of the silicon modules of the upgraded CMS tracker.
• Implementation of the calibration procedures and porting in a prototype system SoC for the acquisition. The candidate will work together with the local team of firmware/software engineers, who will take care of the most technical aspects.
• Preparation of the integration line for the new outer tracker modules (assembly of the modules on their mechanical structure, wiring and tests).
• Participation to the CMS data analysis of Runs 2 and 3, search for exotic long live particles.


• Skills in instrumentation are very appreciated, and/or clear motivation to work on instrumentation, especially on silicon detectors.
• Some knowledge in electronics is welcome.
• Familiar with the working environment of international collaborations.
• Good knowledge of usual computing and programming tools: linux, C++, python, ROOT, computing grid, etc…

Work Context

The position is within the CMS collaboration at the Large Hadron Collider (LHC) at CERN. The group of the IPHC is strongly involved in the experiment, with important contributions both to the detector construction and operations, and to the data analysis.

Since the very beginning of the CMS collaboration, the IPHC group was involved in many aspects of building the present CMS tracker. The IPHC group has been particularly active to build the end-cap disks of the microstrip silicon tracker and to provide the readout electronic. Since the start of the LHC operations, the CMS team at IPHC has important contributions to calibrate and operate the silicon tracker and to improve its data analysis. The IPHC engineers are also responsible of the firmware developments for the present pixel detector, installed in CMS in 2017.

These strong R&D and construction activities have naturally led to significant contributions to physics analyses: precision measurements and search for new physics in top quark sector, search for supersymmetric particles, observation of the associated production of a Higgs boson and a top quark pair. IPHC has also renown expertise on b quark jet identification and on tau lepton identification. Recently, the team is also working on tau lepton polarization measurement and on search for new physics producing displaced vertices within the tracker acceptance.

Such physics searches will be pursued at the High Luminosity LHC (HL-LHC). The HL-LHC will start in 2026 and will allow an integrated luminosity of more than 3000 fb-1 to be accumulated, ten times larger than during the present LHC phase. In order to resist to the high radiation level and to cope with a large number of superimposed events at each bunch crossing (up to 200), while keeping excellent performances, the CMS detector needs to be thoroughly upgraded. For this aim, the IPHC is strongly involved in the building of the new silicon tracker. The upgraded tracker will have both higher granularity, better radiation handling, less material budget and higher geometrical acceptance. Furthermore, the outer layers of silicon strip modules will be directly integrated in the hardware trigger level 1 of the experiment.

The IPHC group contributes since the beginning to the quality tests of the new silicon modules: continuous development of the firmware of the acquisition system using a bench test at the laboratory; responsibility for data acquisition in beam test; analysis of the beam test data and characterization of the new silicon sensors.

IPHC is in charge, for the CMS collaboration, to integrate half (2200) of the silicon strip modules of the outer tracker barrel (TB2S), and to mount the TB2S wheel, as well as to design and fabricate its support pieces. Preparing those tasks is starting this year, with a production foreseen in the years 2021-2024 before the installation at CERN. The Strasbourg group also contributes to the development of the firmware for the upgraded pixel detector.

Furthermore the IPHC is installing a new beam line on its CYRCé cyclotron which will deliver 25 MeV protons produced at high frequency. This dedicated beam line will serve for a system test of silicon modules and for the data acquisition which will be useful during the long LHC shutdown (2019-2020). The beam conditions will allow us to perform high rate tests with high energy deposits at a frequency close to that of the LHC. Long term irradiation tests will also be possible.

Constraints and risks

Work near an accelerator, regular working missions at CERN.

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