Jens Janssen Diploma Thesis - Prof. Dr. Norbert Wermes ...

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few µm compared to a few 100 µm). Active edges becomes an important featureregarding IBL since overlapping (shingling) of modules in direction of the beampipe is not possible.32
Chapter 4The USBpix Test System4.1 IntroductionUSBpix was developed as a small and light weighting test system for ATLASFE-I3 pixel readout chips. As successor to TurboDAQ, which is rather bigin size and consists of many expensive hardware components, it provides thefunctionality which is needed for a full characterization of pixel sensors attachedto the FE-I3 pixel readout chip.The development of the USBpix readout system started in the late 2008.The hardware design and basic software parts (USB driver, microcontrollercode, hardware interface libraries, and basic FPGA code) were developed atSiLAB 1 [33, 34]. Other parts of the software (STcontrol and PixLib) were contributedby the ATLAS Pixel Collaboration and were adapted to the USBpixtest system with support of University of Göttingen 2 .A main part of this diploma thesis covers the code maintenance and furtherdevelopment of the USBpix test system for the FE-I3 readout chip. In thebeginning of this work, source code refactoring was the main task to ensure extensibilityand maintainability of the test system. During this work many partsof the source code were rewritten and new functionality was added. Changeswere made to all system levels, i.e. driver, microcontroller code, libraries, userinterface and in particular to the FPGA code. Continuous testing and the characterizationof sensors (see section 6) during the development cycles helped toimprove the overall quality of the software.Furthermore, USBpix is capable to fulfill the needs for an ATLAS FE-I4 testsystem, of which development started in the late 2009. The FE-I3 test system’ssource code was ported to support the future ATLAS FE-I4 readout chip whichis foreseen for a future IBL upgrade of the ATLAS pixel detector.4.2 RequirementsThe USBpix test system main purpose is the characterization of new generationof sensor material intended for being used for IBL and HL-LHC detector1 Silizium Labor der Univerität Bonn, Nussallee 12, D-53115 Bonn, Germany.2 Georg-August-Universität Göttingen, II. Physikalisches Institut, Friedrich-Hund-Platz 1,D-37077 Göttingen, Germany.33
Page 1: Universität BonnPhysikalisches Ins
Page 7 and 8: Chapter 1IntroductionThe ATLAS expe
Page 9 and 10: Chapter 2The LHC Experiment2.1 The
Page 11 and 12: Figure 2.3: Cut-away view of the in
Page 13 and 14: The electromagnetic calorimeter use
Page 15 and 16: Chapter 3Silicon Pixel Detectors3.1
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Page 28 and 29: Stopping power [MeV cm 2 /g]100101L
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Appendix CTuning ResultsThis page i
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Figure C.1: Tuning of the 3631-303
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8642Figure C.3: Tuning of the WR13
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8642Figure C.5: Tuning of the 4EM9
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[13] Peric, I. et al.: The FEI3 rea
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[37] Backhaus, M. et al.: Developme
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