SPRING QUARTER 2010 |
Last updated:06/15/10 |
| PLEASE NOTE SPECIAL SEMINAR DAY : |
| Monday May 24, 10:30am |
| Location: ISB 310 |
J. Kalliopuska (VTT Microsystems and Nanoelectronics, Tietotie 3, Espoo, PO. Box 1000, FI-02044 VTT, Finland) |
| Title: " DEVELOPMENT OF EDGELESS DETECTORS AT VTT " |
Abstract: VTT has for two decades been involved in the design and manufacturing of silicon radiation detectors. Presently the solid state detector development activity at VTT includes advanced X-ray photo diodes, thin and thick silicon strip detectors, active-edge strip and pixel detectors, and full 3D active edge silicon detectors. VTT has developed technology and provides services for the interconnection and hybridization of fine pitch pixel detectors used in e.g. high energy physics, space missions and medical applications. The presentation shortly summarizes the silicon process resources at VTT and describes the current activity. The main topics are the edgeless strip and pixel detectors for which VTT has developed a straightforward and fast process on 6" (150 mm) wafers. The fabrication process of 150 m thick p-on-n and non-n prototypes having dead layer at the edge below a micron is described. The prototypes include 5x5 cm2 and 1x1 cm2 edgeless microstrip detectors and 1.4x1.4 cm2 Medipix2 edgeless pixel detectors. The presentation shows leakage current, capacitance and breakdown voltage measurements of different DC-coupled 1x1 cm2 microstrip designs and compares them with respect to the active edge distance and polarity of the detector. Electrical and radiation response characterization of 1.4x1.4 cm2 edgeless pixel detectors has been done by coupling them to the Medipix2 readout chips. The leakage currents were measured to be ~90 nA/cm2. Radiation response characterization includes a X-ray tube and source responses. These results show that the edge response depends dramatically on the active edge distance from the nearest pixels.
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| PLEASE NOTE SPECIAL SEMINAR DAY & LOCATION: |
| Friday April 16, 10:30am |
| Location: ISB 102 |
| Prafulla Behera (University of Iowa) |
| Title: "First Physics results from ATLAS Measurements at sqrt(s) = 900 GeV" |
Abstract: The ATLAS Experiment at the CERN Large Hadron Collider will study a broad range of particle physics at the highest ever available energies, from measurements of the Standard Model to searches for new physics beyond the Standard Model. In 2009, LHC machine was commissioned and the ATLAS experiment collected 900 GeV pp collison data. I will report the first ATLAS results based on these data. These are results from minimum bias study which is crucial ingredient for our understanding of QCD as the theory of strong interactions, and are background to all future precise measurements and discoveries. |