A Classic Thesis Style - Johannes Gutenberg-Universität Mainz

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46 experimental setup and data acquisition Figure 26: Simplified scheme of coincidence trigger system. Coincident single arm trigger signals arriving from Spectrometer B and Kaos logic (arrows on the left) are allowed to generated a valid trigger signal when DAQ is not busy. Arming and common stop signals for the TDC, gate signals for the ADC, interrupt signals for the frontend CPU, and additional trigger signals for the MWPC hardware (arrows on the right) are generated for each trigger event. These events are conveniently labeled for synchronisation by the in house made event builder module.
2.8 data acquisition and analysis software 47 As it was mentioned in section 2.6, spectrometer B was chosen as the electron arm spectrometer. Among the set of three spectrometers it was the natural candidate, as it allowed the most forward angle electron detection (needed to maximize virtual photon flux). Both single arm triggers were combined with a dedicated coincidence electronics, shown in Fig. 26. Essentially, coincidences were recorded when data acquisition system for Kaos and spectrometer B were not busy with previous event processing. The more noise-prone Kaos trigger signal was placed inside a large spectrometer B coincidence window, in order to reduce random coincidences and dead time. Coincidence electronics was placed on Kaos platform, and trigger commands and TDC common signal had to be routed back via long coaxial cables to spectrometer B. An in house made electronic module ( KPH Event bilder) labeled the events for their positioning in the data stream. G paddle 30 25 20 15 10 5 0 0 5 10 15 20 25 30 F paddle Figure 27: F vs G paddle combinations implemented in the FPGA based tracking trigger. The red square was incorrectly excluded from the logic. This error, although marginal, was conveniently handled in the simulated acceptance of the spectrometer where tracking logic was included. 2.8 data acquisition and analysis software The set of detectors described in the previous sections provide the information needed for reaction characterization. Analog signals, generated by photomultipliers and wire chambers, are integrated and digitalized. Time differences of discriminated signals are also transformed for computer processing by TDCs in FASTBUS or CAMAC crates. or: m 2 Y = −Q2 + m 2 k + 2νmp − 2Ek(ν + mp) − 2�q · �pk
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M E A S U R E M E N T O F T H E U N
Page 5: A B S T R A C T The new stage of th
Page 9 and 10: C O N T E N T S i kaon electroprodu
Page 11: Part I K A O N E L E C T R O P R O
Page 14 and 15: 4 introduction Lorentz invariance.
Page 16 and 17: 6 introduction appear in the K + Λ
Page 18 and 19: 8 introduction there was almost no
Page 20 and 21: 10 introduction This allows us to w
Page 22 and 23: 12 introduction K ¡p γ ∗ Λ(Σ
Page 24 and 25: 14 introduction means of the isobar
Page 26 and 27: 16 introduction amount of resonance
Page 28 and 29: 18 introduction photo and electropr
Page 30 and 31: 20 introduction 1.6 previous experi
Page 32 and 33: 22 introduction Figure 9: Total cro
Page 35 and 36: E X P E R I M E N TA L S E T U P A
Page 37 and 38: 2.3 target 27 Figure 11: Schematic
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Page 43 and 44: Table 3: Spectrometers properties 2
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138 bibliography [16] J. C. David,
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Figure 73 Annealing at 80° of the
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A Classic Thesis Style - Johannes Gutenberg-Universität Mainz

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