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Job Code DG154
Description
Technology Transfer Facilitator. 1) Validate, update and enrich technical data on CERN Technologies with transfer potential to industry. 2) Liaise with CERN researchers and inventors to ensure the originality and correctness of the data. 3) Track advances in competing technologies. 4) Optimize the position of CERN technologies with respect to targeted domains of transfer.
Special Requirements
Physicist or engineer with knowledge of one, or more, of the Technology Domains interesting for CERN: Applied physics and instrumentation, material sciences, computing, electronics, controls and data acquisition and accelerator physics.
Training Value
Technology and Market Assessments Technology promotion Commercialization of Intellectual Property
Supervisor
JEAN-MARIE LE GOFF

Job Code PH2603
Description
ATLAS is one of the experiments that operate at the CERN LHC collider, where proton-proton collisions take place at unprecedent high energies opening a new frontier in particle physics studies. Tilecal is the hadronic calorimeter of ATLAS and one of its main purposes is the measurement of the energy of jets. Tilecal is made of scintillating material embedded in an iron matrix. Wavelength shifting optical fibres collect the light from the scintillators and guide it to photomultipliers (PMTs). Tilecal is built in three cylindrical sections, two 3 m long sections and one 6 m long section. Each cylinder is built by joining 64 modules. The total number of cells is about 5000 and each cell is readout by 2 PMTs. The context of this job offer is to be integrated in the team in charge of the calibration of the calorimeter. The energy scale was determined testing a small set of individual modules with high energy electron beams before the assembly of the detector. To use that energy scale in the jet reconstruction in LHC it is needed to get the energy response of each cell of all the calorimeter modules and equalise them. There are 3 systems used in the calibration and monitoring of the Tilecal cells: a movable cesium source used to inter-calibrate the several cells, a laser system used to monitor the gain of the PMTs and the respective electronic chain, and a charge injection system used to calibrate the electronic chain response. The candidate will learn the details of each of the calibration systems and the way they are integrated in the global calibration chain of Tilecal. This calibration approach is complemented with methods that use the LHC physics events to calibrate the global calorimeter of ATLAS. The candidate will develop calibration software tools, that access the databases where calibration parameters are stored and will implement calibration algorithms. The final goal is to obtain the calibration parameters and the magnitude of the systematic and/or statistical errors in the determination of the energy scale.
Special Requirements
Degree in physics or physics engineering with interest in detector development
Training Value
Gain experience in practical aspects of calibration of a detector
Supervisor
ANA MARIA HENRIQUES CORREIA

Job Code PH2923
Description
CLIC Detector R&D and Reconstruction Tools Introduction: within the CERN Linear Collider Detector project, we currently perform detector concept studies and detector simulations for a future experiment at the 3 TeV CLIC e+e- collider. In general, the detectors shall be capable of providing high-precision measurements in the presence of a significant beam-induced particle background. We also perform targeted detector R&D in a few important development areas for such a future experiment. These hardware R&D activities concentrate on: high-precision and low-mass pixel detector development for the CLIC vertex detector, beam tests of dense hadron calorimetry based on tungsten absorber, time-stamping and power-pulsing technologies for CLIC detectors. The trainee project will be devoted at the 50% level to the assessment of a tungsten-based hadron calorimeter: preparation of beam tests of HCAL modules based on various active detector techniques (scintillator and gas-based), calibration, data taking, analysis of test beam data, assessment of time-stamping capabilities, verification with Geant4 models, drawing conclusions about suitability for a CLIC detector. The HCAL development will be carried out in the framework of the CERN LCD project and the CALICE collaboration. The other half of the project will be devoted to studies in one of the three following domains (choice to be made later and in agreement with the student): optimisation of high-energy jet reconstruction tools based on Particle Flow Analysis techniques, development of track reconstruction and lepton identification tools, participation in CLIC vertex detector R&D. Contact person: Lucie Linssen (Linear Collider Detector project leader)
Special Requirements
University degree in physics, including university courses in particle physics. Programming skills, preferably C++. Additional knowledge of detector simulation tools (e.g. Geant) will be an advantage.
Training Value
The project offers the opportunity to a young physicist to acquire a broad knowledge in particle physics and particle detection. The LCD project is currently in a phase where fundamental choices for a future experiment will be made. The trainee will therefore have the opportunity to learn about the core underlying principles driving the concept and technology choices of a large particle physics experiment. The project offers the opportunity to work both on hardware and on software tasks. The project is carried out in a framework of international collaboration. The trainee will be supervised by an experienced experimental physicist.
Supervisor
LUCIA LINSSEN

Job Code PH102
Description
=========== Background: =========== Detector components for the experiments at the CERN Large Hadron Collider will be exposed to very high levels of radiation during operation. The absolute radiation level and the particle composition of the radiation field (gammas, electrons, protons,?) will be very different for the various sub-detector components of the experiments. In order to measure the radiation field and in order to predict and/or analyze the possible failure of components due to radiation damage the radiation has to be monitored. Presently, a working group is developing and characterizing radiation sensors to measure the various components of the radiation field. Among the devices that will be integrated into the radiation monitoring system are commercial p-i-n photodiodes and special Field Effect Transistors, so called Radiation Detection Field Effect Transistors (RADFETs). The commercial p-i-n diodes, used in industry for infrared remote control applications, are able to measure the non-ionizing radiation dose. In particular, they show an increase of their leakage current when biased reversely, and a linear increase of their resistivity when powered forward. Both parameters can be used to monitor the radiation level very accurately over a wide particle fluence range. ========= Project: ========= During the project the student will irradiate RADFETs and p-i-n diodes with high energetic protons and neutrons and analyze the response of the devices to the irradiation. The annealing of the devices will be investigated in detail by means of isothermal and isochronal annealing studies, which will expose the microscopic solid-state mechanisms that underlay the annealing behavior. Afterwards, the data will be analyzed and a parameterization for the annealing behavior will be produced that later on can be used in the LHC experiments to correct for annealing effects during operation.
Special Requirements
Hardware oriented. Basic knowledge in interaction of radiation with matter. Good team spirit. Basic knowledge of Labview would be helpful but is not required.
Training Value
In the project "Radiation Monitoring for the LHC with RADFETs and p-i-n diodes" the student will learn the basics of the interaction of radiation with matter and various methods how to monitor radiation and radiation fields. In particular he will work with two types of devices: Radiation Field Effect Transistors and forward biased silicon diodes.
Supervisor
MICHAEL MOLL