From 01.07.99 I started my PhD study at DESY (Deutsches Elektronen Synchrotron). The title of my thesis became: "The Backward Silicon Track Trigger for the H1 Experiment at HERA". The silicon track trigger is a part of the backward silicon tracker (BST) of the H1 experiment, which is a joint facility of YPI (Yerevan, Armenia), IUIHE ULB-VUB (Brussels, Belgium), PD UIA (Wilrijk, Belgium), IP AS CR (Prague, Czech Republic), IPNP CU (Prague, Czech Republic), DSM/DAPNIA (Gif-sur-Yvette, France), CPPM UM (Marseille, France), LAL UParis-Sud (Orsay, France), EP LLR (Palaiseau, France), UP LPNHE (Paris, France), PI RWTH (Aachen, Germany), EP UD (Dortmund, Germany), DESY (Hamburg, Germany), IE UH (Hamburg, Germany), MPK (Heidelberg, Germany), KIP UH (Heidelberg, Germany), PI UH (Heidelberg, Germany), IEAP (Kiel, Germany), MPIP WHI (Muenchen, Germany), FP BU (Wuppertal, Germany), DESY (Zeuthen, Germany), SPSR UB (Birmingham, Great Britain), RAL (Chilton, Didcot, Great Britain), SPC LU (Lancaster, Great Britain), OLL UL (Liverpool, Great Britain), QMWC (London, Great Britain), PD UM (Manchester, Great Britain), DFURT INFN (Roma, Italy), CZDF (Mexico, Mexico), CMDFA (Merida, Mexico), INP (Cracow, Poland), JINR (Dubna, Russia), ITEP (Moscow, Russia), LPI RAS (Moscow, Russia), IEP SAS (Kosice, Slovak Republic), PD UL (Lund, Sweden), PSI (Villigen, Switzerland), PIUZ (Zuerich, Switzerland), IT ETH-ZH (Zuerich, Switzerland) at HERA (Hadron Elektron Ring Anlage) - the particle accelerator in Hamburg, Germany.
  The BST is being used in conjunction with the SpaCal calorimeter for detailed investigations of lepton inclusive deep inelastic scattering (DIS) off the proton. The detector consists of silicon pads to trigger on particle tracks and of silicon strips for the precise track measurements. During the HERA upgrade in 2000-2001 the BST hardware had been modified: the "strip" system was improved and the new "pad" system was developed. The "pad" device incorporates 48 detector modules distributed over 6 motherboards. The microprocessor front-end provides the full detector control and performs the main data reduction algorithm. The data sample from every motherboard is transmitted via the VME interface to the H1 central trigger system. Two VME repeater cards route and synchronize the data flow. Three store cards accumulate all data streams into the pipeline to be readout later upon the demand of higher trigger levels. The master card makes the level-one trigger decision based on Monte Carlo simulation results. BST has a "dead time free" triggering concept.

Semi-automatic setup for ASIC tests

Studies of fast signal transmission

Data analysis

Years of practice: It was a fruitful time in Berlin and Hamburg devoted to the High Energy Physics and the HighTech: programming under UNIX, Windows and Macintosh OS in Fortran, "LabView" and VHDL, design with "OrCad", "Quartus" and "MaxPlus". Sometimes I had a lot of routine work, but also I took part in several conferences that made me possible to see some other countries and cities. I had very good colleagues and met many new friends and with their help I mastered German and improved my English.

Danke Deutschland !!!