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28th RD50 Workshop (Torino)

Jun 6 – 8, 2016
Torino
Europe/Rome timezone

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Contribution List

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  1. 31. Introduction
    6/6/16, 9:00 AM
  2. 2. The GigaTracker
    Dr Matthew NOY (CERN)
    6/6/16, 9:10 AM
    The GigaTracker (GTK) hybrid pixel detector has been designed to provide hits timed to better than 200ps RMS. I will give an introduction to the detector architecture and talk about the special techniques used to achieve this demanding requirement. I will also describe the factor that we think ultimately limit the time resolution achievable with such an architecture.
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  3. 30. Timing information in HEP
    Tommaso Tabarelli De Fatis (MIB)
    6/6/16, 9:40 AM
  4. 11. Radiation hardness and precision timing study of Silicon Detectors for the CMS High Granularity Calorimeter (HGC)
    Esteban Curras (CERN - IFCA(CSIC-UC))
    6/6/16, 10:10 AM
    The high luminosity LHC (HL-LHC or Phase-II) is expected to increase the instantaneous luminosity of the LHC by a factor of about five, delivering about 250 fb−1 per year between 2025 and 2035. Under these conditions the performance degradation of detectors due to integrated radiation dose/fluence will need to be addressed. The CMS collaboration is planning to upgrade many components,...
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  5. 34. 3D Pixel Detectors for AFP and HL-LHC
    Joern Lange (IFAE Barcelona)
    6/6/16, 10:30 AM
  6. 3. Radiation damage models: comparison between Silvaco and Synopsys
    Dr Marco Bomben (LPNHE)
    6/6/16, 11:30 AM
    In this talk we will present a comparison between Silvaco and Synopsys predictions when it comes to radiation damage models; the focus will nbe on the recent Perugia model. Leakage current increase, depletion voltage and trapping time will be extracted and compared. The simulated structures will include standard and LGAD n-on-p diodes.
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  7. 4. Phase II planar pixel sensors: Simulation study of interpixel isolation and surface passivation by a thin-film ALD-layer
    Dr Timo Peltola (Helsinki Institute of Physics)
    6/6/16, 11:50 AM
    Interpixel isolation and charge sharing before and after irradiation in the proposed Phase II planar pixel n-on-p detectors was studied by TCAD simulations. Both p-spray and p-stop isolated devices with varied isolation doping concentration and depth as well as interface charge density were investigated. The results show that the acceptors in the isolation implantation are compensating the...
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  8. 14. E-TCT measurements of irradiated HV-CMOS test structures
    Mr Igor Mandić (Jožef Stefan Institute)
    6/6/16, 12:10 PM
    E-TCT measurements with HVCMOS detectors produced by different foundries on substrates with different resistivities will be presented. Samples were irradiated with reactor neutrons in Ljubljana and with protons at CERN PS. Measurements were made with passive detector structures in which current pulses induced on charge collecting electrode could be directly observed. In reverse biased HVCMOS...
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  9. 26. TCT studies on AMS H35 CMOS devices for application in the ATLAS tracker upgrade
    Mr Emanuele Cavallaro (IFAE)
    6/6/16, 12:30 PM
    H35Demo chips are High-Voltage CMOS (HV-CMOS) devices produced in the 350nm AMS technology (H35) on wafers with four different substrate resistivity, the standard one of 20 Ω · cm and 80, 200 and 1000 Ω · cm. The aim of this HV-CMOS production is to study the radiation hardness of such detectors and investigate the possibility to introduce this technology in the next ATLAS tracker upgrade for...
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  10. 13. The influence of edge effects on the determination of doping profiles using silicon pad diodes
    Dr Eckhart Fretwurst (University of Hamburg)
    6/6/16, 2:00 PM
    Edge effects for square p+n pad diodes with guard rings, fabricated on high-ohmic silicon, are investigated. Using capacitance-voltage measurements of two pad p+n diodes with different areas, the planar and the edge contributions to the diode capacitance are determined separately. Different methods of extracting the doping concentration are compared. In practically all cases it is found that...
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  11. 24. Test beam and clean room studies of ATLAS PPS modules with alternative bias rail geometries
    Dr Clara Nellist (LAL, Orsay)
    6/6/16, 2:20 PM
    It is known that for the current design of planar pixel sensors, there is a drop of efficiency at the punch-through structure of the biasing system at the edge of pixels. Various geometries, as part of the ATLAS Inner Tracker (ITK) upgrade, are being investigated to reduce this inefficiency. Planar pixel sensors with multiple alternative bias rail geometries have been tested at the SPS beam...
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  12. 8. Status of the RD50-Project "NitroStrip"
    Alexander Dierlamm (Karlsruhe Institute of Technology)
    6/6/16, 2:40 PM
    The aim of the "NitroStrip" project is to extent the "NitroSil" project by preforming charge collection measurements on strip sensors, which are not included in "NitroSil". Both projects evaluate the radiation resistance of nitrogen enriched silicon. We will present the finally approved project plan and the current status of the project.
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  13. 9. Performance of thin n-in-p planar pixel modules with and without active edge
    Ms Natascha Savic (Max-Planck-Institute for Physics)
    6/6/16, 3:00 PM
    New productions of thin n-in-p pixel sensors designed at MPP will be presented. Sensors of thicknesses of 100 and 150 um have been produced at ADVACAM and CiS and interconnected to FE-I4 chips. At ADVACAM SOI wafers were employed, while at CiS anisotropic KOH etching was carried out to create backside cavities in the wafer leaving thicker frames around each single structure. To maximize the...
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  14. 32. RD50 LOGO
    6/6/16, 3:40 PM
  15. 33. Steering Committee
    Dr Michael Moll (CERN)
    6/6/16, 4:30 PM
  16. 46. Wine
    Piergiorgio Cerello (TO)
    6/6/16, 6:00 PM
  17. 6. The Birmingham Irradiation Facility
    Laura Gonella (University of Birmingham)
    6/7/16, 9:00 AM
    The Particle Physics and Nuclear Physics Groups at the University of Birmingham have been operating the MC40 cyclotron with UK colleagues from Sheffield and Liverpool since 2013 as an irradiation facility for nuclear, medical and particle physics collaborations, such as RD50, ATLAS and LHCb. This facility offers a proton beam with energy up to 40MeV and currents as high as 2uA, allowing to...
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  18. 17. Detector Irradiation at CNA
    Prof. Joaquin Gomez Camacho (CNA)
    6/7/16, 9:20 AM
    CNA (Centro Nacional de Aceleradores) is a spanish users facility dedicated to multidisciplinary applications of particle accelerators. The recent activities at CNA associated to irradiation of radiation detectors will be presented.
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  19. 12. Experimental determination of the NIEL hardness factor for the new CERN proton irradiation facility.
    Mr Isidre Mateu (CIEMAT)
    6/7/16, 9:40 AM
    A new 24GEv/c proton irradiation facility replaced the old CERN facility in 2014. An experimental determination of the hardness factor of the new facility is ongoing. Results on the scaling of the leakage current with increasing fluence for several irradiations performed in 2015 and 2016 will be presented.
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  20. 16. CiS Planar Sensor Technologies for Future High-Luminosity-LHC Upgrades
    Mr Ralf Röder (CiS)
    6/7/16, 10:00 AM
    Planar hybrid silicon sensors are a well proven technology for past and current particle tracking detectors in HEP experiments. However, the future high-luminosity upgrades of the inner trackers at the LHC experiments pose big challenges to the detectors. The first challenge is an expected radiation damage level of 2E16 n_eq cm^-2. The second challenge is the large detector areas which have to...
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  21. 42. High-resolution three-dimensional imaging of a depleted CMOS sensor using an edge Transient Current Technique based on the Two Photon Absorption process (TPA-eTCT)
    Mr Marcos Fernandez Garcia (IFCA-Santander)
    6/7/16, 11:00 AM
  22. 23. Silicon sensors with internal gain: Optimizing for charged particle fast timing
    Dr Michael Moll (CERN)
    6/7/16, 11:20 AM
    Internal Gain in Si timing sensors is needed to overcome the ~100 picosecond lower limit encountered by NA62 GTK and the CMS HGCal projects. We focus on 2 techniques, currently available for achieving internal gain- 1) “reachthrough” in which a high field region is limited to a superficial few micron thick layer and 2) “deep-depleted AD’s where it is deep and the distribution between “drift”...
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  23. 1. Progress in Ultra-Fast Silicon Detectors
    Hartmut Sadrozinski (SCIPP UC Santa Cruz)
    6/7/16, 11:40 AM
    We report on the status of the development of Ultra-Fast Silicon Detectors (UFSD). UFSD are novel silicon sensors based on the Low-Gain Avalanche Diodes (LGAD) design and, due to internal gain, exhibit a signal which is a factor of ~ 10 larger than standard silicon detectors. The internal gain allows obtaining fast and large signals, a pre-requisite for time applications, and thus they are...
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  24. 19. Technological Developments on iLGAD Detectors for Tracking and Timing Applications
    Ms Maria del Mar Carulla Areste (PhD Student at Instituto de Microelectrónica de Barcelona-CNM-CSIC)
    6/7/16, 12:00 PM
    This presentation introduces the latest technological development on the Inverse Low Gain Avalanche Detector iLGAD as well as the first characterization results. This structure is based on the standard Avalanche Photo Diodes (APD) concept that includes an internal multiplication of the charge generated by radiation. The multiplication is inherent to the basic n++-p+-p structure, where the...
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  25. 39. Performance of thin LGADs after irradiation
    Dr Gregor Kramberger (Jozef Stefan Institute)
    6/7/16, 12:20 PM
  26. 20. First LGAD fabrication on 50um SOI wafers at CNM for the HGTD
    Ms Maria del Mar Carulla Areste (PhD Student at Instituto de Microelectrónica de Barcelona-CNM-CSIC)
    6/7/16, 2:00 PM
    This presentation introduces the simulation and experimental results of the first Low Gain Avalanche Detector on 50um SOI Wafers fabricated at CNM for the High Granularity Timing Detector (HGTD) located in front of the forward calorimeter (FCAL).
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  27. 38. Results from the first 300-micron thick LGAD production at FBK
    Marco Ferrero (TO)
    6/7/16, 2:20 PM
  28. 25. Design considerations on thin LGAD sensors
    Nicolo' Cartiglia (TO)
    6/7/16, 2:40 PM
    In this contribution I will review the progresses made towards the design of segemented, thin LGAD for timing measurements.
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  29. 22. TCT measurements and analyses of proton irradiated LGADs
    Ms Sofía Otero Ugobono (Universidade de Santiago de Compostela, and CERN)
    6/7/16, 3:00 PM
    Results from the study of LGADs from CNM Run 7859 will be presented. Some of these sensors have been subjected to proton irradiation at CERN. The fluences to which these were exposed are 1E12, 1E13, 1E14 and 1E15 neq/cm^2. TCT measurements were performed before and after irradiation. These TCT studies were particularly focused on analysing: charge collection, spatial homogeneity, gain, and...
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  30. 44. Signal Amplification in strip-LGAD and I-LGADs
    Dr Ivan Vila (Instituto de Fisica de Cantabria (CSIC-UC))
    6/7/16, 3:20 PM
  31. 40. Reasons for gain degradation with irradiation in LGADs
    Dr Gregor Kramberger (Jozef Stefan Institute)
    6/7/16, 3:40 PM
  32. 45. TCAD Radiation Damage analysis of CNM-LGAD Detectors
    Prof. Francisco Rogelio Palomo Pinto (Escuela Técnica Superior de Ingenieros Universidad de Sevilla)
    6/7/16, 4:30 PM
  33. 21. Status of LGAD RD50 projects at CNM
    Dr giulio Pellegrini (Centro Nacional Microelectronica IMB-CNM-CSIC)
    6/7/16, 4:50 PM
    I will report the first measurements of detectors fabricated with Ga implant and the new proposal for a project to increase the radiation hardness of LGAD sensors using Carbon. In LGAD the gain decreases with irradiation, which can be attributed to effective acceptor removal in the multiplication layer. The relative decrease of measured charge is much more pronounced for LGAD than for standard...
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  34. 35. HRTEM investigations of different clusters produced in Si by electron and neutron irradiation.
    Dr Leona Cristina Nistor (National Institute of Materials Physics)
    6/8/16, 9:00 AM
  35. 36. ESR of point defects in pure and 17O/13C doped Si-FZ irradiated with 3.5 and 27 MeV electrons. Correlation with TSC data.
    Dr Vasile Sergiu Nistor (National Institute of Materials Physics)
    6/8/16, 9:20 AM
  36. 5. Neutron Irradiated doping profile evaluation
    Mr Evangelos - Leonidas Gkougkousis (Laboratoire de l'Accelerateur Lineaire)
    6/8/16, 9:40 AM
    The creation of deep level defects after irradiation lowers the efficiency of a detector while increasing its operational voltage. The case of acceptor removal, observed in irradiated LGAD and other types of detectors suggests the presence of a secondary effect in addition to deep acceptor level generation. Estimation of the active dopant profile demonstrates a decrease in the acceptor...
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  37. 7. Possibilities of large fluence irradiation dosimetry using multi-crystalline Si
    Dr Eugenijus Gaubas (Vilnius University)
    6/8/16, 10:00 AM
    It had been shown that measurements of carrier recombination lifetime can be employed for contact-less and fast evaluation of large fluences of the hadron irradiations. The same calibration function for fluence evaluations derived using electron-grade crystalline silicon wafer fragments fits well the absolute values of carrier recombination lifetime related to the densities of radiation...
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  38. 15. Study of surface radiation damage of segmented Si sensors at Hamburg University: Results, status and next steps
    Dr Joern Schwandt (University of Hamburg)
    6/8/16, 11:00 AM
    Studies of surface radiation damage and the impact of the charge distribution on the outer surface of segmented silicon sensors are ongoing at Hamburg University since 2007. In this talk, selected results obtained from measurements on test structures and strips sensors will be presented: - dose and electric field dependence of the effective oxide charge density, Nox, - dose and...
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  39. 18. Generation shallow radiation damages at the strip surface with low energy protons.
    Mr Sven Wonsak (University of Liverpool)
    6/8/16, 11:20 AM
    The aim of the shallow radiation damage generation study is the creation of a multiplication layer close to the silicon sensor surface. This is done by irradiating the sensor with low energy protons at the Birmingham cyclotron, which should stop within approximately 20μm. Geant4 simulations have been used to find the best settings for the irradiation. First sensors have been irradiated with 12...
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  40. 27. Electric field, mobility and trapping in Si detectors irradiated with neutrons and protons up to 1e17 n_eq/cm^2
    Prof. Marko Mikuz (Univ. Ljubljana / J. Stefan Inst.)
    6/8/16, 11:40 AM
    Electric field in silicon irradiated with neutrons up to 1e17 n_eq/cm^2 and PS protons up to 3e16 p/cm^2 was investigated by edge-TCT. From the v(E) dependence under FW bias mobility degradation with fluence was extracted. From a comparison of concurrently measured FW and reverse velocity profiles absolute electric field profiles in the silicon bulk were obtained. A 1/sqrt(Phi) dependence of...
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  41. 28. TCT measurements of n-type MCz diodes after irradiation with 70 MeV protons and 300 MeV pions
    Mr William Holmkvist (Linköping University)
    6/8/16, 12:00 PM
    n-type Magnetic Czochralski (MCz) was found in earlier studies to exhibit a peculiar behaviour with irradiation, in particular not exhibiting space-charge sign inversion (SCSI) after irradiation with high-energetic hadrons such as 24 GeV protons at CERN PS or 800 MeV protons at Los Alamos while the material behaved as expected after irradiation with neutrons or low-energy 23 MeV protons at...
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  42. 41. Characterization of neutron irradiated pad detectors using a Transient Current Technique based on the Two Photon Absorption process (TPA-TCT)
    Mr Marcos Fernandez Garcia (IFCA-Santander)
    6/8/16, 12:20 PM
  43. 10. Characterization of NitroSil diodes at KIT
    Alexander Dierlamm (Karlsruhe Institute of Technology)
    Diodes made from three different wafer materials (FZ, N-rich FZ, O-rich FZ) have been irradiated with protons (5e13 to 5e15neq/cm²) and are being characterized (IV, CV, TCT). Here we present the first results of these measurements.
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  44. 37. End of Workshop