Bachelor Theses

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2021-09-23
12:14
[PUBDB-2021-03808] Bachelor Thesis
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Suche nach pseudoskalaren Dunkle-Materie-Mediator-Teilchen in Signaturen mit zwei Bottom-Quarks, einem leptonisch zerfallenden ūĚíĀūĚüé- Boson und fehlender Transversalenergie
72 pp. () = Bachelorarbeit, University of Hamburg, 2021
Obwohl etwa 85% der gesamten Materie im Universum aus Dunkler Materie besteht (vgl.Eidem√ľller 2017: 5), ist ihre Natur bisher noch ungekl√§rt. Lediglich die Gravitationswirkung, die Dunkle Materie auf sichtbare Materie zu hab en scheint, ist erwiesen. [...]
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2021-09-06
10:40
[PUBDB-2021-03645] Bachelor Thesis
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Lock-in Amplification for Laser and X-ray Beam Induced Current Measurements of Solar Cells
68 pp. () = Bachelorarbeit, Universität Hamburg, 2021
Laser beam induce current (LBIC) and X­ray beam induced current (XBIC) are effective tech­niques for mapping the spatial electrical performance of solar cells. Conducting precise currentmeasurements up to the femto­Ampere range is challenging and susceptible to noise [...]
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2021-09-06
10:35
[PUBDB-2021-03644] Bachelor Thesis
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Comparison of laser and X-ray beam induced current measurements of a crystalline Si solar cell
48 pp. () = Bachelorarbeit, Universität Hamburg, 2021
X­ray beam induced current (XBIC) and laser beam induced current (LBIC) measurements en­able the point by point correlation of solar cell performance with complementary measurementmodalities in scanning microscopy.In this Bachelor’s thesis a complete mini­module with a mono­crystalline silicon solar cell in­cluding housing was measured using a 28keV X­ray beam and a 532nm laser beam as a probe.In particular, the influence of an Ag finger front contact on the multi­model signals induced bythe two measurement probes was compared.The hard X­ray photons were nano­focused and the energy was chosen that the beam can pene­trate the complete module and excite the AgK electrons in the Ag fingers. The strong absorptanceof the Ag fingers can be clearly seen in the X­ray transmittance measurements. [...]
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2021-08-19
14:23
[PUBDB-2021-03435] Bachelor Thesis
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Study of Interferences Between Resonant Heavy-Higgs-Boson Production and Top-Antitop-Quark Production in the nStandard Model
112 pp. () = Bachelorarbeit, University of Hamburg, 2021
Recent discoveries in the area of cosmology, like the proposition of dark matter, haveindicated that there may be additional particles beyond the Standard Model which mayexplain the phenomena of Dark Matter in the Universe. Among many suggestions ofwhat Dark Matter actually is, there are models such as two-Higgs doublet Models thatpredict the existence of additional scalar (H) or pseudoscalar (A) Higgs bosons whichcould function as mediators between Standard Model and Dark Matter particles. [...]
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2021-06-20
20:31
[PUBDB-2021-02687] Bachelor Thesis
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Commissioning of a Calibration Device for Second Sound Based Quench Detection and Reconstruction Analysis
49 pp. () = Bachelorarbeit, University of Hamburg, 2021
An important part of research and development (R&D) in the field of superconducting radiofrequency cavities is quench detection since these local breakdowns of superconductivity primarilylimit the cavity performance. Due to the detection of second sound waves propagating inliquid helium, the localization of quench spots on superconducting radio frequency cavities no longer requires the laborious attachment of many temperature sensors. [...]
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2021-03-12
11:37
OpenAccess [PUBDB-2021-01412] Book/Bachelor Thesis
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Machbarkeitsstudie zur modularen Programmierung eines 6-Achsen-Justierroboters
[DESY-THESIS-2021-003]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 268 pp. () [10.3204/PUBDB-2021-01412] = Bachelorarbeit, Hochschule RheinMain, 2020  GO
In this bachelor thesis a feasibility study is carried out about assembling and programming a control unit for the 6 axis positioning robot EASy P1 series. The positioning robots will be used at DESY Research Center to adjust accelerator components. [...]
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2020-12-01
18:45
OpenAccess [PUBDB-2020-04685] Bachelor Thesis
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Untersuchung der Entwicklung von gamma-ähnlichen Protonschauern mit den hadronischen Wechselwirkungsmodellen EPOS-LHC und QGSJETII-04
48 pp. () [10.3204/PUBDB-2020-04685] = Bachelorarbeit, Humboldt-Universit√§t zu Berlin, 2020  GO
Hadronische Wechselwirkungsmodelle spielen eine zentrale Rolle in der Teilchenphysik, weil sie unter anderem zum Vergleich experimenteller Daten von durch Cherenkov-Teleskopen detektierten Luftschauern genutzt werden, um Eigenschaften des prim√§ren Luftschauerteilchens abzuleiten. In dieser Arbeit werden die beiden hadronischen Wechselwirkungsmodelle EPOS-LHC und QGSJETII-04 f√ľr gamma-√§hnliche Luftschauer in deren ersten Wechselwirkung durch Monte Carlo Simulationen untersucht. [...]
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2020-11-12
12:57
[PUBDB-2020-04413] Bachelor Thesis
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Degradation of perovskite solar cells by X-rays
1-24 () = Bachelorarbeit, Universität Hamburg, 2020
Perovskite solar cells are a promising photovoltaic technology with their low production costsand high efficiencies. The main reason the technology is not ready for the market yet is the instability of the perovskite absorber and its fast degradation. [...]
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2020-11-12
12:52
[PUBDB-2020-04411] Bachelor Thesis
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Analysis of Synchrotron-Based X-Ray Fluorescence Measurements from Multiple Detector Modules
1-36 () = Bachelorarbeit, Universität Hamburg, 2020
X-ray fluorescence measurements are an ideal method for measuring the elemental distributions in samples but complications like self absorption make the evaluation of these measurements non-trivial ‚Äď especially when using multiple detector modules. This is further complicated when studying low concentrations of elements, where accurate background subtraction and elemental sensitivity is essential. [...]
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2020-11-12
12:48
[PUBDB-2020-04409] Bachelor Thesis
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The effect of stoichiometric variations on performance in CIGS solar cells measured using X-ray microscopy
1-66 () = Bachelorarbeit, Universität Hamburg, 2020
Scanning X-ray microscopy measurements are an indespensible tool of solar cell research to-day, and the compatibility with complementary measurement modes is a particular strength. This Bachelor’s thesis investigates a series of thin-film solar cells with a Cu(In,Ga)Se2(CIGS) absorber layer that differ in their overall ratio of gallium to indium, resulting in a varyingbandgap. [...]
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