التفاصيل البيبلوغرافية
| العنوان: |
An FPGA-based Sampling ADC for the Crystal Barrel Calorimeter |
| المؤلفون: |
Müllers, Johannes Sebastian |
| المساهمون: |
Thoma, Ulrike, Ketzer, Bernhard |
| بيانات النشر: |
Universitäts- und Landesbibliothek Bonn |
| سنة النشر: |
2019 |
| المجموعة: |
bonndoc - The Repository of the University of Bonn |
| مصطلحات موضوعية: |
FPGA, Sampling ADC, Auslese, Kalorimeter CB, ELSA, ddc:530 |
| الوصف: |
The CBELSA/TAPS experiment in Bonn investigates the excitation spectra of protons and neutrons through meson-photoproduction. With its ability to polarize the target nucleons and the incident photon beam, the experiment has contributed significantly to a better understanding of the baryon excitation spectrum, and with that also to the understanding of the strong interaction in the non-perturbative regime. Since a recent upgrade, the experiment's main electromagnetic calorimeter, the Crystal Barrel, is read out by avalanche photo-diodes. Their signal is digitized by integrating Fastbus ADCs, providing a value proportional to the energy deposited in the calorimeter crystals. As a result of long conversion and transfer times, those ADCs have become the limiting factor in the data acquisition, with possible readout rates of less than 2 kHz. Moreover, the possibility to identify pile-up, i.e. quickly-succeeding energy deposits that overlap in the integration window, is presently missing. Already years ago, it has been investigated whether this readout system could be replaced by faster and more modern sampling ADCs, which offer access to the waveform representation for a more sophisticated analysis, but the investigations were limited to commercially available digitizers with high cost and low channel densities. In addition, the firmware (operating system) of such digitizers is usually closed-source, which does not allow for the implementation of experiment-specific algorithms. Due to the above reasons, the investigations had not led to a satisfactory solution, and the Fastbus ADCs are still in operation today. In this thesis, the development and test of a custom (non-commercial) FPGA-based sampling ADC, which will replace the Fastbus ADC, has been driven forward. This so-called CB-SADC (Crystal Barrel Sampling Analog-to-Digital Converter) has been adapted from a prototype of the PANDA experiment in such a way that it is suited to operate within the specific conditions of the CBELSA/TAPS experiment. Apart from the ... |
| نوع الوثيقة: |
doctoral or postdoctoral thesis |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:5n-56693; https://hdl.handle.net/20.500.11811/8118 |
| الاتاحة: |
https://hdl.handle.net/20.500.11811/8118 |
| Rights: |
In Copyright ; http://rightsstatements.org/vocab/InC/1.0/ ; openAccess |
| رقم الانضمام: |
edsbas.8AD3A7A6 |
| قاعدة البيانات: |
BASE |