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000000342 005__ 20160805033907.0
000000342 037__ $$aBELLE2-MTHESIS-2016-003
000000342 041__ $$aeng
000000342 100__ $$aEduard Prinker
000000342 245__ $$aTesting of the Gated Mode for the Belle II Pixel Detector
000000342 260__ $$aMunich$$bMax-Planck-Institute for Physics$$c2015
000000342 300__ $$amult. p
000000342 500__ $$aPresented on 01 08 2015
000000342 502__ $$aMSc$$bMunich, Ludwig-Maximilians-University$$c2015
000000342 520__ $$a    DEPFET pixel sensors offer intrinsic amplification, low mass and a very high signal to noise ratio. They form an integral building block f or the vertex detector system of the Belle II experiment, which will start data taking i n the year 2017 at the new Super- KEKB electron-positron collider in Japan. The parti cle bunch currents have a rather short lifetime in the order of 10 minutes. To keep the significantly increased luminosity of the collider constant over time, the bunch curre nts have to be topped off by injecting daughter bunches at a rate of 50 Hz. The particles in the daughter bunches produce a high rate of background (“noisy bunches”) for a sho rt period of time, saturating the oc- cupancy of the sensor. Operating the DEPFET sensor in a so far unexplored new mode (“Gated Mode”) allows preserving the signals f rom collisions of normal bunches while protecting the pixels from background signals of the passing noisy bunches. A special test board (Hybrid 4.1) is used, which cont ains a small version of the DEPFET sensor with a read-out (DCDB) and a steering chip ( SwitcherB) attached, both con- trolled by a field-programmable gate array (FPGA) a s the central interface to the com- puter. Experimental results presented in this thesi s demonstrate that the Gated Mode can be efficiently operated at full target operatio n speed of 320 MHz.
000000342 8560_ $$fphleitl@mpp.mpg.de
000000342 8564_ $$uhttps://docs.belle2.org/record/342/files/BELLE2-MTHESIS-2016-003.pdf
000000342 8564_ $$uhttps://docs.belle2.org/record/342/files/BELLE2-MTHESIS-2016-003.pdf?subformat=pdfa$$xpdfa
000000342 980__ $$aTHESIS