ASTERICS is a test platform designed for the radiation testing of digital circuits. It has been developed by the TIMA lab (Grenoble, France). The aim is to acquire the competence and develop further this tester.
Development of simulation tools at device level for semiconductor sensors. We are interested both in the simulation of static characteristics as for instance coupling capacitances, electric fields, etc, but also dynamic characteristics as signal developed in different sensors when particles are passing through. Tools used to made this simulations are based in comercial software as TCAD or Silvaco and programs developed by ourselves. This work profits from the close collaboration with DICE (FSA/UCL).
External collaborators: Denis Flandre (UCLouvain - EPL).
Gigatracker is in the core of one of the spectrometers used in NA62. It's composed of three planes of silicon pixels detectors assembled in a traditional way: readout electronics bump bonded on silicon sensors. Each plane is composed by 18000 pixels 300 um x 300 um arranged in 45 columns and readout by 10 chips. The particularity of this sensor is that its timing resolution should be better than 200 ps in order to cope with high expected rate (800 MHz). Another particularity is its operation in vacuum. CP3 is involved in several aspects in the construction of this detector. 1) Signal development of the signal in the sensor. We use both commercial programs (i.e. TCAD by Synopsys) as well as software developed by us to study the expected signal of this sensor. This step is of high importance to design and scale properly the readout electronics readout. 2) Design and test of the readout chip. We are participation in the design of one of the two proposed chips to perform the sensor readout, the so called End-Of-Column option. We will participate also in the test both at lab as well as under beam of this chip. This work is being done in collaboration with CERN and INFN (Torino). 3) Support mechanics and cooling. CP3 is one of the responsible institutes in the design, construction and assembly of the support mechamics and cooling. The whole system should be light, able to operate in vacuum as well as assure a thermal stability. This work is done in collaboration with INFN (Ferrara) A campaign of test beams has been scheduled in order to fully qualify this detector.
LARA: LAser for Radiation Analysis LARA is a general purpose laser testbench devoted to study the radiation susceptibility of semiconductor devices. The systems consists in a high precission step motors (~0.1 um), a 1060 nm pulsed laser (PiLAS) with associated optics to obtain beam spots f ~5-6 um, and a set of photodetectors to measure both integrated and pulse-by-pulse optical power. LARA will have two main applications: 1. Test of semiconductor sensors (pixel, microstrips, etc). 2. Study of single event effects (SEE) in semiconductor components. A set of standard measurement equipment will be available to perform measurements for both type of applications.
NA62 will look for rare kaon decays at SPS accelerator at CERN. A total of about $10^{12}$ kaon decays will be produced in two years of data taking. Even though the topology of the events is relatively simple, and the amount of information per event small, the volume of data to be stored per year will be of the order of 1000 TB. Also, an amount of 500 TB/year is expected from simulation. Profiting from the synergy inside CP3 in sharing computer resources our group is participating in the definition of the NA62 computing scheme. CP3 will be also one of the grid virtual organization of the experiment. Two computers models are now under study. One with a centralized on line farm close to the experiment, in which raw data storage and level3 filters will be done at CERN, and different centres belonging to virtual organization will be used for reprocessing, simulation and analysis. The other model is based in a distribution of raw data to few computing centres outside CERN, where data storage will be assured as well as the tasks mentioned before. In both cases CP3 will contribute in a significative way. Tests and simulations of both concepts will be performed during 2010. The scientific projects related to or directly integrated on the UCL computing cluster are the following: MadGraph/MadEvent, CMS-Tier2 and Cosmology.
External collaborators: INFN (Rome I), University of Birmingham.
Metrology and instrumentation of CYCLONE-110 T2 irradiation line to test semiconductor sensors and electronics under neutron fluences (max neq/cm2).
External collaborators: Michael Moll (CERN).
ALthough the study of rare kaon radiative decays is not the main objective of NA62, both the detector and the beam are fully adapted to their study. Among all radiative kaon decays, two channels are going to be studied in depth in order to see if NA62 could provide extra information: and . These channels can provide information about direct CP violation and QCD-QED interplay.
External collaborators: A. Ceccucci (CERN).
A key element of future experiments with linear colliders (ILC, CLIC), will be the ability to exploit the particle flow algorithms. They are based on the possibility to follow all the particles produced by e+e- collisions in the various sub-detectors to measure the energy. Thus, the calorimeters, which until now were used to measure the particle energy will be required to have a tracking capability. In this perspective, we participate with other European and Belgian groups in the development and the construction of a hadron calorimeter with a large granularity as with short-term goal to build a 1m3 prototype. The calorimeter is based on GRPC detectors used as sensitive medium. Then we participate in data analysis and in test beam particles at CERN. This project will also study the hadronic showers and compare the results obtained with phenomenological models. The outcome of this comparison should significantly improve our understanding of this phenomenon.
External collaborators: Imad Laktineh (IPNL - Lyon) M.C Fouz (CIEMAT) J.C. Brient (LLR - Ecole Polytechnique).
A precision test of lepton flavour universality can be performed by measuring the ratio RK of kaon leptonic decay rates and . Any deviation of the expected Standard Model prediction will be a hint of New Physics. This measurement has been performed at one percent level with the NA62 data taken in 2007 and 2008 in complete agreement with the Standard Model expectation. A prospective analysis for the improvement of this measurement with the full NA62 apparatus is underway.
External collaborators: Augusto Ceccucci (CERN), Cristina Lazzeroni (Birmingham).
Development of silicon sensors (strixels) for CMS tracker upgrade for very high luminosity at LHC. This activity is making usr of the cyclotron of UCL, the probe stations and the SYCOC set-up: SYCOC stands for "SYstem de mesure de COllection de Charge". This system is intended to measure charge collection efficiency of semiconductor detectors with both a laser and radiactive sources. This installation is used in the characterization of semiconductor detectors in order to study its radiation hardness. This project is done in collaboration with RD50 team at CERN.
External collaborators: CRC, Frank Hartman (Karlsruhe) and RD50 and CMS collaboration.
The TRAPPISTe series of sensors tries to use SOI technology to build a monolithic pixel sensor. SOI wafers consist of a thin top silicon active layer, a middle insulating buried oxide layer and a thick handle wafer. Due to the insulating layer, SOI technology allows for more compact layout and lower parasitics compared to traditional bulk CMOS processes. The TRAPPISTe-1 sensor was designed and fabricated at UCL’s WINFAB facility at the Ecole Polytechnique de Louvain. WINFAB provides a 2m Fully Depleted SOI process with the following characteristics: • 100nm top active layer, 400nm buried oxide layer, 450um handle wafer • substrate: 15-25 Ωcm, p-type • four types of transistors with different threshold voltages: low Vt, standard Vt, high Vt, graded. The first fabrication of the TRAPPISTe-1 chip was delivered in January 2010. Unfortunately, the process was complicated by a contamination resulting in a voltage shift of all the transistors. A second run of the TRAPPISTe-1 chip is currently being produced. The TRAPPISTe-2 project has just begun with the SOIPIX collaboration and will use OKI Semiconductor 0.2um technology to build a pixel sensor and test structures. The OKI technology provides the following: • active layer thickness 50nm, BOX thickness 200nm, handle wafer thickness 250-350um • substrate resistivity of 700 Ωcm, n-type • 4 metal layers • buried p-well (BPW) to suppress back gate effect TRAPPISTe-2 chips have been delivered by OKI in the beginning of 2011. To test the TRAPPISTe chip, a readout board and a laser test station are being developed. The readout board consists of a daughter board and main board. The daughter board is a small board used for mounting and bonding the TRAPPISTe chip. Several daughter boards have been designed to accommodate the TRAPPISTe-1 and TRAPPISTe-2 chips. The daughter boards plug into the main board which contains DACs to set the appropriate bias voltages and an ADC controlled by an FPGA to read the detector output. A laser test station is being commissioned to test the charge collection of the device. The TRAPPISTe project has been presented at the following conferences: - iWoRiD 2009 - IEEE Nuclear Science Symposium 2009 - Vienna Conference on Instrumentation 2010 TRAPPISTe group has also joined the SOIPIX collaboration and was presented at the SOIPIX Collaboration Meeting 2010. SOIPIX is an international research collaboration developing detector applications in SOI technology. More information on the TRAPPISTe project can be found at: https://server06.fynu.ucl.ac.be/projects/cp3admin/wiki/UsersPage/Physics/Hardware/Trappiste.
External collaborators: Denis Flandre (UCLouvain - EPL) Elena Martin (Universitat Autonoma de Barcelona).
