Particle physics – study of the elementary constituents of matter – is one of IP2I’s main activities. Through the development of a calorimeter for the future linear accelerator, the direct measurement of antihydrogen acceleration due to Earth’s gravitation and the research conducted on the Higgs boson at the LHC, the FLC (CALICE), AEgIS and CMS teams are helping to assemble the puzzle for an understanding of our universe.
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The team’s objective is to develop a high granularity hadronic calorimeter to equip future leptonic gas pedals. The calorimeter proposed for the FLC is entitled Semi-Digital Hadronic Calorimeter (SDHCAL). It uses RPC (resistive plate chamber) type gas detectors as active medium, read by integrated electronics with a granularity of 1cm2. The RPCs are inserted in a compact mechanical structure that acts as an absorber.
This type of calorimeter is used to measure the energy of the hadrons produced during collisions in particle gas pedals: on reaching the hadron calorimeter, they will deposit their energy in it by creating a sheaf of particles (called a jet) whose shape and size make it possible to identify it and measure its energy. The high granularity of the detector is therefore essential to increase its performance.
The team, with its partners, has built the first prototype of this new generation of calorimeters, as well as the associated electronics, and has designed Particle Flow Algorithms (PFA) to improve the reconstruction of the jets resulting from the interactions and to precisely measure their energy. Several tests at CERN have demonstrated the great power of SDHCAL.
The team contributed to the realization of the TOMUVOL detector for volcano tomography. It has developed a new reading scheme for large detectors with a reduced number of electronic channels while maintaining high granularity.
SDHCAL Prototype
Activities
- Organization of several beam tests of the SDHCAL prototype at CERN (2015, 16, 17 and 18) and exploitation of the data for the study of hadronic showers.
- Development of the full simulation of the SDHCAL prototype as well as the SDHCAL in ILD and CEPC.
- Design, construction and operation of the TOMUVOL detector with LPC.
- Design and realization of large RPC detectors (2 m2) and new reading electronics for module0 of SDHCAL for the ILD ILC project.
- Participation in the drafting of the ILD-ILC DBD and in the CDR of the CEPC project.
- Design and realization of the large reading cards for RPC chambers for the muon CMS upgrade project using timing.
- Design of a new ZDAQ acquisition system
- Design of a new reading card for gas detectors (PCT/EP2018/053561-EN3062926)
- Development of PFA algorithms (ArborPFA/APRIL)
- Development of a new material for RPC detectors to increase their detection rate by a factor of 1000.
- Design and realization of a detection system for homeland security for the company Smiths Detection based on the patent. Financing by PULSALYS.
- Co-organization of the CHEF conferences on calorimetry.
Interaction of a pion (left) and an electron (right) in SDHCAL
Measurement of hadron beam energy at CERN (left: linearity, right: resolution)
Knit Pads for Reading Gas Detectors (PCT/EP2018/053561-EN3062926)
The AEgIS (Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy) team at IP2I is working on the experiment of the same name carried out at CERN. The aim is to make the first direct measurement of the effects of gravitation on antimatter by observing the fall of antihydrogen atoms.
Researchers use antiprotons to produce a beam of antihydrogen atoms that is sent into a device called a Moire deflectometer. Combined with a position detector, this allows them to measure the magnitude of the gravitational interaction between matter (Earth) and antimatter (antihydrogen) to an accuracy of 1%.
The deflectometer is equipped with a grid system that divides the antihydrogen beam into parallel beams, creating a periodic structure whose analysis allows the deflection of the antihydrogen beam during its horizontal flight to be determined. By combining this measurement with the time of flight, we can then measure the gravitational force exerted on the antihydrogen atoms.
The AEgIS collaboration brings together physicists from all over Europe and faces many technical challenges such as the use of very low temperatures (0.1° K), ultra-vacuum (10-11 mbar), high magnetic fields (1 and 5 T), Lyman lasers α to characterize antihydrogen jets, the production of excited positronium, antiprotons, etc…
Our team built the hydrogen ion beam used to characterize the deflectometer’s moirĂ© arrays.
NON-PERMANENTS:
- DOCTORANTS / DOCTORAL STUDENTS:
- CHERCHEURS NON-PERMANENTS / NON-PERMANENT RESEARCHERS:
- C. A. de Sousa, Pedro Costa, M. C. Ruivo, H. Hansen. Phase diagram and critical properties in the Polyakov--Nambu--Jona-Lasinio model. IX International Conference on Quark Confinement and the Hadron Spectrum - QCHS IX, Aug 2010, Madrid, Spain. pp.592-594, ⟨10.1063/1.3575104⟩. ⟨in2p3-00589070⟩
- K. HadyĹ„ska-KlÄ™k, P. J. Napiorkowski, A. Maj, F. Azaiez, J.J. Valiente-DobĂłn, et al.. Refinement of the 42Ca Level Scheme. Preliminary Results from the First AGATA Demonstrator Experiment. Zakopane conference on nuclear physics, Aug 2010, Zakopane, Poland. pp.817-824, ⟨10.5506/APhysPolB.42.817⟩. ⟨in2p3-00587825⟩
- Y. Nakano, Y. Takano, T. Shindo, T. Ikeda, Y. Kanai, et al.. Observation of intrashell radiative decay of Li-like uranium (2p(3/2)-2s(1/2)) using silicon drift detectors. 15th International Conference on the Physics of Highly Charged Ions, Aug 2010, Shanghai, China. pp.014010, ⟨10.1088/0031-8949/2011/T144/014010⟩. ⟨in2p3-00685979⟩
- D. Dauvergne. Deceleration of Highly-Charged Ions in Crystal Channeling Conditions. 7th Stored Particle Atomic Physics Research Collaboration, Aug 2010, Lanzhou, China. ⟨in2p3-00777433⟩
- P. Sortais, T. Lamy, J. Medard, J. Angot, C. Peaucelle. Beam, multi-beam and broad beamproduction with COMIC devices. XIXth International Workshop on ECR Ion Sources (ECRIS 2010), Aug 2010, Grenoble, France. pp.TUCOCK01. ⟨in2p3-00512352⟩
- C. Peaucelle, J. Angot, P. Grandemange, T. Lamy, T. Thuillier, et al.. FIRST A/Q=3 BEAMS OF PHOENIX V2 ON THE HEAVY IONS LOW ENERGY BEAM TRANSPORT LINE OF SPIRAL2. XIXth International Workshop on ECR Ion Sources (ECRIS 2010), Aug 2010, Grenoble, France. pp.TUCOAK01. ⟨in2p3-00512348⟩
- A. Vancraeyenest, D. Guinet, D. Curien, O. Stézowski, Q.T. Doan, et al..
-spectroscopy of positive parity bands in the Gd
nucleus. 3rd International Conference on Frontiers in Nuclear Structure, Astrophysics and Reactions (FINUSTAR), Aug 2010, Rhodes, Greece. pp.453-455, ⟨10.1063/1.3628443⟩. ⟨in2p3-00785193⟩ - N. Chanon. Photon commissioning in CMS at 7 TeV. Conference Higgs Hunting 2010, Jul 2010, Orsay, France. ⟨in2p3-00967588⟩
- G. Lehaut. A Study of Stopping Power in Nuclear Reactions at Intermediate Energies. International Symposium on Nuclear Symmetry Energy (NuSym10), Jul 2010, Wako, Japan. ⟨in2p3-00765411⟩
- G. Grenier. Search for Leptoquarks and Technicolor at the Tevatron. 35th International Conference on High Energy Physics (ICHEP2010), Jul 2010, Paris, France. pp.391. ⟨in2p3-00612175⟩
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