Summer Student Projects Submission 2022

Contribution List

76. 3D Modelling of Self-Amplified X-ray Emission

On-site planned, but remote also possible

The ultrashort high-intensity pulses from x-ray free-electron lasers can drive the matter in novel states. In our group, we investigate the self-amplified x-ray emission caused by massive inner-shell photoionization. In these conditions, spontaneously emitted x-ray fluorescence develops into collective emission resulting in short and intense x-ray bursts. This phenomenon can give rise to new...

23. Adhesion of coinage metals on thin polymer films

On-site project

High Power Impulse Magnetron Sputtering (HiPIMS) is an emerging physical vapor deposition technique in industry and research which allows for creating novel polymer-metal composites. One reason is its higher ionized fraction of ions during deposition compared to conventional sputter and evaporation techniques. First results in the literature show a big advantage over conventional sputter or...

74. Analysis of Belle II data

On-site planned, but remote also possible

Belle II is the detector observing electron-positron annihilations at the
asymmetric energy Super-KEKB factory in Japan since 2019. More than a billion
processed and calibrated events are available at DESY. Physics topics being
pursued include precision lifetime measurements for tau leptons and charm
hadrons, which exploit the unique pixel vertex detector. Further analysis
techniques...

45. Analysis of the structure massoia lactone through light-matter interaction

On-site project

We propose to investigate the same compound, massoia lactone (MAL), using two spectroscopic techniques, Fourier transform infrared (FTIR) spectroscopy and Fourier transform microwave (FTMW) spectroscopy to analyze and compare their spectral features. Massoia lactone (MAL) is the intermediary product between 6-amyl-α-pyrone and delta-decalactone, both molecules important in several fields of...

8. Autoregressive normalising flows for computing molecular vibrational wave functions

On-site project

Neural networks are a promising tool to approximate wave functions and solutions of partial differential equations in general. They were shown to be free from the curse of dimensionality in some cases. However, methods employing neural networks are far from being reliable because of the lack of convergence guarantees. Normalising flows are a promising tool where accurate numerical results as...

77. Building an agile platform for web-based testing.

Remote project

Scientific work is placing increased dependency on web technologies,
with the web-browser being a key tool for certain activities. As DESY
is providing an ever increasing number of services with web
front-ends, it is becoming important to build a robust, agile platform
for testing these services.

This project involves building a Proof of Concept testing platform
using industry...

54. Calibration of the new CMS luminosity detector BCM1F

On-site planned, but remote also possible

The BCM1F detector of the CMS experiment consists of 48 silicon pad sensors situated close to the beam pipe on both sides of the interaction point. The detector provides an online, quasi-real-time measurement of the instantaneous luminosity the CMS and the LHC control rooms. For the Run-3 data taking, BCM1F was completely refurbished.
The topic of the Summer Student project is data analysis...

40. Calorimeter energy regression with Graph Neural Networks

On-site planned, but remote also possible

In high energy physics we study the fundamental properties of particles by recording their interaction with our detectors. In calorimeters, the particles create showers and deposit energy in the individual calorimeter cells. CMS will build a new calorimeter (HGCAL) with an extremely large number of cells. As these cells are distributed somewhat irregularly, the most natural representation of...

50. Characterization and Calibration of 2nd Gen AGIPD Electronics

On-site project

The Adaptive Gain Integrating Pixel Detector (AGIPD), a megahertz frame-rate, high-dynamic range integrating pixel detector, was developed for photon science experiments at the European X-Ray Free Electron Laser (European XFEL) and tailored to its unique specifications. Two 1-Megapixel AGIPD detector systems have been installed at the European XFEL and are producing numerous scientific...

24. Characterization of conducting polymer films for thermoelectric applications

On-site project

Short description: Poly(3-hexylthiophen-2,5-diyl) (P3HT) is one of the most prominent semiconducting, conjugated polymers in the fields of organic electronics and photovoltaics. Besides its high electric conductivity, it shows thermoelectric properties when doped with metal chlorides or nanoparticles, for example gold (Au). Thin thermoelectric P3HT films are of utmost importance and...

25. Characterization of digital cameras based on photon transfer measurements

On-site project

Area scan sensors (CCD or CMOS cameras) are widely used for beam profile measurements in particle beam diagnostics. They provide the full two-dimensional information about the beam distribution, allowing in principle to investigate shot-to-shot profile fluctuations at moderate repetition rates. In order to study the performance and to characterize these cameras, photon transfer is a widely...

43. Charge collection simulations in monolithic silicon sensors, based on Allpix2

On-site planned, but remote also possible

Novel silicon sensor developments in CMOS imaging processes pose new challenges; in contrast to traditional hybrid sensors the shape and amplitude of the electric field, which is required to collect deposited charge, is highly non linear. Finite element simulations - with Synopsys TCAD - are used to precisely model the electric fields based on doping profile estimations. The time dependent...

61. Charge collection studies in HV-CMOS

On-site planned, but remote also possible

HV-CMOS sensors are a promising technology for new silicon pixel sensors and advanced to a high level of complexity during more than a decade of developments. These pixel sensors profit from the HV capabilities of the manufacturing process and allow for large depletion zones of above 50um at moderate substrate resistivity. This approach is complementary to the usage of imaging sensors and...

26. Cherenkov detector development for LUXE

On-site project

The LUXE experiment (LASER Und XFEL Experiment), currently being planned at DESY, will probe Quantum Electrodynamics (QED) in the vicinity of extremely strong electromagnetic fields, by studying the interaction of high-energy electrons and photons with a high-intensity LASER beam. In such extreme strong-field conditions, the processes of QED can no longer be described by a perturbative...

59. CMS Phase-2 Tracker endcap integration.

On-site project

The student will participate in various activities related to the integration of the CMS Phase-2 Tracker endcap.

The integration of detector modules onto the supporting mechanical structure brings various challenges that have to be addressed. The thermal coupling of the PS detector modules using a thermal interface material has to be established. Candidate materials are being studied. The...

83. Collin-Soper kernel determination in Higgs boson production using PB-TMDs

On-site project

We will study Higgs boson production at the LHC, specifically its transverse
momentum spectrum using PB-TMDs with the CASCADE generator. We will
transform the pT spectrum to physical space and determine the Collin-Soper
kernel for gluon parton densities, which is sensitive to non-perturbative
physics.

Physics / Computing/ Engineering Content of the project :
Physics: QCD...

33. Colloidal lithography for plasmonic particles

On-site project

Duration: 6 weeks (1 week to get knowledge about the lab setups and the process of colloidal lithography; 3 weeks for mask preparation with variation of colloids (size, shape etc.) for further materials deposition (Au-Ag, Au-Cu, Ag-Cu by spin-coating and sputtering) to find optimal controlled way to produced plasmon particles; 2 weeks to characterize the samples with optical microscopy, AFM,...

63. Continuous scale factor measurements for MVA-based electron identification

On-site planned, but remote also possible

CMS is one of the two large multipurpose proton-proton collider experiments at the LHC at CERN. The focus of this project is on the measurement of identification efficiencies for electrons in the CMS detector. The identification algorithm is based on multivariate analysis (MVA) using machine-learning techniques. MC simulations of the data are used to model the detector response and to correct...

79. Conventional FTIR and novel frequency comb spectroscopy of molecular vibrations in Fabry-Pérot cavities

On-site project

Infrared radiation is absorbed by molecules if the frequency of the radiation matches the oscillation period of interatomic motions in the molecule. In our lab we study how those absorption features can be modified when the molecule is placed inside an optical resonator where continuous energy exchange between molecule and resonator can occur. We are characterizing those molecule-resonator...

28. Correlation Functions in N=4 Super Yang-Mills Theory

On-site planned, but remote also possible

In this project, the student will work on state of the art bootstrap and integrability techniques for the computation of correlation functions in N=4 super Yang-Mills theory and/or the related AdS/CFT dual string theory.

This is a purely mathematical physics project.
Computer algebra systems might be employed, but there will be no heavy computing.

56. Data analysis of D mesons in CMS and its phenomenological results

On-site planned, but remote also possible

There are on-going projects of measuring charm production at 0.9, 5, 7 and 13 TeV in CMS. Measuring D mesons like D0 and D* by reconstruction of pion and kaon particles detected from CMS experiment is to derive charm total cross section at different energies, which follows extrapolation of cross section from not only CMS measurement and also other LHC measurements.
This summer student project...

12. Data analysis of photoelectrons from high-intensity x-ray free electron laser pulses

Remote project

FLASH and European XFEL are both X-ray free-electron laser facilities where ultra-short X-ray pulses are produced using the SASE (Self Amplified Spontaneous Emission) process. One of the key differences between these facilities is the amount of X-ray pulses produced, and therefore the data recorded, being at least one order of magnitude higher for the EuXFEL. We have developed a flexible...

42. Deep Learning-Based Time-of-Flight Reconstruction for Future Higgs Factories

On-site planned, but remote also possible

Experiments at future e+e- collider Higgs factories present the opportunity to perform measurements of the Higgs boson and electroweak observables with unprecedented levels of precision. Utilizing such machines to their full physics potential places stringent requirements on the performance of the detector. As a high-level reconstruction task, highly performant particle identification is...

73. Designing nanomechanical resonators for high-frequency gravitational wave detection

On-site planned, but remote also possible

Background
The levitated sensor detector is a novel kind of gravitational wave detector targeting signals in the frequency range of 10 – 300 kHz [1,2]. It comprises a dielectric disk trapped by the light field inside an optical cavity. A passing gravitational wave displaces the disk from its equilibrium position (i.e., the antinode of the trapping field), which results in a restoring...

60. Detecting FIPs at a FutuDetecting FIPs at a Future Higgs Factoryre Higgs Factory

On-site planned, but remote also possible

FIPs (Feebly Interacting Particles) are proposed entities that can
explain dark matter and the non-observation of such states at accelerators:
The reason they have not yet been seen is rather than that they are too massive
(the explanation of non-observation of SUSY), they are too feebly interacting to
have been observed at LHC or LEP. Future e+e- machines opens up new ways...

78. Development of Laser Beam Profiler Software

On-site planned, but remote also possible

The group FS-LA, Laser Science and Technology, is responsible for the research, development, and operations of laser systems for the large-scale facilities at DESY in Hamburg. The current spectrum of lasers in the group range from low power, high stable mode-locked oscillators up to multi kW ultra-short pulsed laser systems for pump-and-probe experiments at FELs.
Many of those lasers include...

29. Development of ultrafast laser sources and devices for the characterization of femtosecond pulses

On-site project

In the attosecond science group at CFEL (https://atto.cfel.de), we generate ultrashort laser pulses with attosecond (1 fs = 10−18 s) or few-femtosecond (1 fs = 10−15 s) duration. These pulses are used to trigger ultrafast dynamics in a variety of systems, from bio-relevant molecules to clusters and nanosystems, and to follow in real-time how the atoms and electrons move and interact. With our...

53. Double parton scattering and models for double parton distributions

On-site project

A brief overview about the project. The main subjects of this project are:

• LHC physics, in particular QCD.
• double parton scattering (DPS), i.e. hadron-hadron collisions with two simultaneous hard interactions.
• double parton distributions (DPDs), the DPS counterpart of regular parton distribution functions (PDFs).
• models for DPDs.

DPS reactions are often neglected...

82. Drell Yan pT resolution at low pT

On-site project

We will study the limits on the resolution of the DY pT at very small pT,
using CERN open data. We will first focus on the muon pT resolution as main
source of smearing of the DY pT at small pT. We will also study the DY pT
spectrum at low DY mass as a way of improving the muon pT resolution. The
work will be done primarily using python jupyter notebooks that will then be
released as...

47. EM energy resolution studies with ATLAS detector

On-site planned, but remote also possible

Many measurements performed by the ATLAS collaboration rely on an accurate understanding of the electron and photon energy response. The parametrization of the energy resolution is an fundamental piece that could be improved thanks to a special dataset collected by ATLAS during the Run 2 of the LHC.

Our current knowledge of the relative energy resolution, σ/E, is so far limited by our...

15. Evaluation of Machine Learning method for automated real-time analysis.

Remote project

The European XFEL generates extremely intense X-ray flashes used to explore the structure and dynamics of matter. In the Data Analysis team, we are researching and developing Machine Learning methods to automatize the analysis pipeline and optimize the beamtime taken by scientists when taking data. One of the projects under development aims to automatize the tuning of several parameters of a...

52. Experimental studies on the strip end-cap system test for the new ATLAS Inner Tracker

On-site planned, but remote also possible

The ATLAS Inner Tracker (ITk) is the new foreseen all-silicon tracking detector for the ATLAS experiment at the High-Luminosity LHC starting in 2026. A substantial part of the new detector, one of the strip detector end-caps, will be assembled at the DESY site.
In the phase of the production, a large number of different detector components ranging from sensors over modules to populated...

36. Exploring different data analysis approaches in EDM4hep

On-site planned, but remote also possible

The FTX Software (SFT) group is very actively involved in the Key4hep project, which aims to develop common software for future collider projects. The group is currently involved in the development of a new and common event data model (EDM) at the core of the common software stack, EDM4hep. An important aspect of the Key4hep project, and EDM4hep in particular, is its ease of use for...

21. Functional cellulose-lignin-coating on porous materials

On-site project

Lignins are wood-based sustainable materials with specific absorption of UV wavelengths. This makes them suitable and sustainable candidates for functionalized coatings in view of being impermeable for UV light. We investigate functionalized, nanocomposite coatings of cellulose nanofibrils (CNF) and different lignins. Our challenge is to make them robust again all common external influences....

49. Generative Adversarial Networks for Fast Calorimeter Shower Simulations

On-site planned, but remote also possible

Simulation of Calorimeters is a computational-costly process. Different strategies to replace these simulations with generative models are currently developed. This is especially important for the High Luminosity LHC and the coming high granularity upgrade of the CMS forward calorimeter. The summer student will have opportunities to learn about generative modelling and calorimetry.
We will...

72. Higgs and BSM physics

On-site planned, but remote also possible

Theoretical investigations of Higgs physics and possible effects of physics beyond the Standard Model of particle physics

71. High precision polarized photons at future lepton colliders

On-site planned, but remote also possible

The potential of future electron and muon colliders can only be assessed with the help of precision theoretical predictions. This applies especially to the description of exclusive photon radiation. There are many theoretical approximations, that become theoretically demanding when lepton beams and/or photons are polarized. Several theoretical approximations are to be investigated regarding...

81. High-Power Lasers for Laser-Plasma Acceleration

On-site project

Laser-plasma acceleration promises a next-generation compact source of electron beams for a large variety of applications. The high-power terrawatt-class lasers required to drive these machines are extremely complex and challenging. This project will address current topics in laser development for plasma accelerators. The summer student will join the laser development team spending time in the...

30. Identification of non isolated tau leptons with ML techniques

On-site planned, but remote also possible

Among charged leptons, taus are the only ones able to decay hadronically. Their hadronic decays are characterized by the presence of charged hadrons occasionally accompanied by an electromagnetic shower. This makes their identification challenging when the tau is produced close to jets, and limits the efficiency of studies involving tau leptons produced in high multiplicity events like HHH ->...

55. Implementation, test and documentation of a public Open Data analysis example with LHC and other HEP Open Data in the context of PUNCH4NFDI

On-site planned, but remote also possible

Open Data analysis examples in HEP are so far available in simplified
approaches for educational purposes, or at research level in dedicated
technically rather demanding environments.
Based on previous work, e.g. the analysis of decays of the Higgs boson
to four leptons, or the analysis of Z boson and J/psi meson production with
decays to two leptons, the main goal is to bring such...

18. Investigating white light continuum generation for ultrafast time-resolved optical absorption spectroscopy studies on functional molecules

On-site project

Scientific research questions
Our young, dynamic work group focusses on understanding photochemical reactivity in molecular systems with ultrafast x-ray and optical sources. In particular, we concentrate on smaller molecular model systems in solution as well as complex transition metal coordination compounds with relevance for e.g. solar energy or photoswitching applications, with the goal of...

58. Investigation of photo-induced ultrafast processes in purely organic molecular crystals by time-resolved photocrystallography.

On-site planned, but remote also possible

The internship will be an opportunity offered by FS-SCS group in photon science division of DESY to work for a limited period of time, in an onsite project. Interns are usually undergraduate students with physics or related background and the internship last for close to 6-7 weeks.
The FS-SCS group is mostly invested in investigating energy conversion and structural changes in molecules...

39. Investigation of the plasma relaxation process in a high-repetition-rate plasma-wakefield accelerator

On-site planned, but remote also possible

High electric fields in excited plasma wakes make them an attractive medium for electron-bunch acceleration with broad applicability to industry and medicine, as well as research facilities such as particle colliders and free-electron lasers. For such facilities, the luminosity and brilliance, respectively, scale with the achievable repetition rate, thus making it a crucial performance...

84. Investigation on the beam based alignment (BBA) in the booster accelerator at PITZ

On-site project

At the photo injector test facility at DESY in Zeuthen (PITZ), the trajectory of the electron beam（6-7 MeV) in the booster accelerator is optimized routinely for improving the transverse phase space, which is crucial to the performance of the photo-injector. If entering the booster tilted and/or displaced, the electron beam will suffer asymmetric RF fields, which is axially symmetric and will...

17. Laser ablation for diamond X-ray optics

On-site project

The material diamond is ideally suited for refractive X-ray optics that are used in synchrotron radiation facilities such as EuXFEL and PETRA III. However, material properties pose a challenge for fabrication. Laser ablation is one tool to shape diamond substrates into lenses, but surface roughness is a critical parameter. The student will investigate the ablation process, optimize parameters,...

13. Laser-based commissioning of a momentum microscope

On-site project

Description: The purpose of this project is to set up a laser beam path at the SXP instrument to commission the momentum microscope in combination with the laser in-coupling unit.
To this end, the stability and focus properties of the laser beam should be characterized using an alignment laser and CCD cameras. The beam properties of the optical reflectivity of the sample will also be...

51. Machine learning algorithm development for jet flavour tagging

On-site planned, but remote also possible

The identification of jets containing b-hadrons (flavour tagging) underpins the results in many areas of the physics programme of the ATLAS experiment, such as the observations of the Higgs boson decay into bottom quarks or recent searches for resonant pair production of Higgs bosons.

The long lifetime ($\tau$ = 1.5 ps), large mass ($m_{b}$ = 5 GeV), and decay properties of b-hadrons...

14. Machine Learning for Predictive Maintenance.

Remote project

The European XFEL generates extremely intense X-ray flashes used to explore the structure and dynamics of matter. In the Data Analysis team, we are researching and developing Machine Learning methods to automatize the analysis pipeline and optimize the beamtime taken by scientists when collecting data. One of the projects under development aims to detect anomalies within the system monitoring...

80. Machine Learning Techniques for Laser-Plasma Accelerators

On-site project

Laser-plasma acceleration promises a next-generation compact source of electron beams for a large variety of applications. However, the non-linear, complex interaction between drive laser pulse and plasma results in a large parameter space, and tuning a plasma accelerator to produce useful electron beams is extremely complex. Here, we want to use machine learning techniques to autonomoulsy...

48. Making the top quark open in the CMS open data

On-site planned, but remote also possible

The top quark is one of the building blocks of the Standard Model, and the heaviest known particle. Up to now, top quarks have been only visible at the Tevatrong Collider at Fermilab and at the LHC. Top quarks are important to many studies of the strong force and the production probabilities are sensitive to the ratio of gluons and quarks in the protons.

The goal of this summer student...

69. Merging 3D reciprocal space from individual diffraction patterns

On-site planned, but remote also possible

The measurements of diffraction are usually performed using a 2D detector and the actually measured diffraction pattern corresponds to a spherical cut through the reciprocal space. By collecting many of such patterns, corresponding to different orientations of a measured sample, one can reconstruct a full 3D reciprocal space of the measured object. This is very useful for the accurate analysis...

65. Metrology measurements of CMS Outer Tracker Modules

On-site project

We offer a project related to metrology measurements of CMS Outer Tracker Modules. A SmartScope, a device to measure objects with a high spacial accuracy, will be used to evaluate the precision of the built modules. The student will also get involved in the assembly of CMS Outer Tracker modules.

16. Model-based analysis of interface evolution during spray coating

On-site project

Duration: around 7 weeks.

Short description: In modern thin film technology, spray coating plays a crucial role in fabricating flexible electronics and photovoltaics. The complex interface and multilayer structure are deduced by surface-sensitive scattering methods [1]. Spray coating was applied to create functional layers, from novel latex colloids to complex biomaterials templates [2,3]....

10. Noble metal sputter deposition on nanostructured polymer templates

On-site project

Vacuum deposition of functional thin films has applications in numerous fields ranging from structural materials to solar cells, sensors, catalysis and medicine. Time-resolved X-ray scattering under high-speed industrial conditions in combination with spectroscopic methods provide ultimate insights to answer crucial questions about structure-property relationships. This knowledge is essential...

75. Operation of an accelerator

On-site project

Join the ARES operation team
We are looking for a summer student joining the ARES operation team. The student will participate in the daily operation of an accelerator for research and development studies. The student will focus on different methodes to diagnose the beam parameters, like beam size, beam position, intensity and pulse length.
In addition, the student will learn the working...

37. Particle track reconstruction using quantum computers

On-site planned, but remote also possible

Quantum computing holds the potential to solve the ever increasingly challenging problems in high energy physics, one of which is particle tracking in a dense environment. The student will learn about the basics of particle tracking and apply quantum computing algorithms to solve real-world problems in high energy physics. The student will be guided through Jupyter notebook and use Qiskit...

9. Performance Comparison of Machine Learning Classifiers for the Calibration of the Hard X-Ray Single-Shot Spectrometer at the European XFEL

Remote project

Single-crystal monochromators are used in free electron lasers for hard x-ray self-seeding, selecting a very narrow spectral range and further amplifying the original SASE signal. When a crystal is rotated, one can exploit several symmetric and asymmetric reflections as established by Bragg's law. A ML classifier is used during experimental setup to identify the crystal indices corresponding...

62. Performance Evaluation of Stitched Passive CMOS Strip Sensors

On-site planned, but remote also possible

The next generation of tracking detectors for future particle physics experiments will be mostly all-silicon detectors. For their realization, apart from the physics specifications, also the cost effectiveness will play an important role. Here, the commercial CMOS technology is a prime candidate, which allows the use of large and high-resistivity wafers and also provides the advantage of...

22. Piezo system for X-ray beam steering

On-site project

The project is for assembling and commissioning an optical test set-up to steer the X-ray beam at the beamline. The assembling is planned in the lab with commissioning with the laser beam. After that, depending on the progress of commissioning in the lab tests experiments foreseen at the beamline.

70. Precision Gravity

On-site project

EFT approach to gravitational dynamics, scattering amplitudes, Gravitational Waves

20. Processing serial crystallography data measured at FELs and synchrotrons

On-site planned, but remote also possible

Our group (group leader H.N.Chapman) is one of the inventors of Serial Crystallography (SX) – the method when many protein crystals are measured in random orientations to get the full 3D structure of the protein. This technique was developed for Free Electron Lasers (FELs) but now it is also becoming a standard technique used at modern synchrotrons. Having a lot of experience and expertise in...

38. Research on sustainable new generation organic solar cells with cellulose

On-site project

Organic photovoltaic (OPV) cells have unique features such as flexibility, lightweight, nontoxic, transparency and large-area OPV panels can be fabricated by low-cost solution processing methods.
In the past few years a novel polymer PBDB-T-2F (PM6) and the combination of the new non-fullerene acceptors BTP-4F (Y6) with PC71BM were highly studied. These organic solar cells (OSC) show...

32. Search for high-mass Higgs bosons in the final state with b-quarks with CMS Run 2 data

On-site planned, but remote also possible

The discovery of the Higgs boson in 2012 marked a major breakthrough for particle physics. Up to this date, precision measurements that followed have indicated that the found particle agrees with the Standard Model predictions. However, there is still room for an extended Higgs sector as predicted by theories beyond the Standard Model, including Supersymmetry or general Two Higgs Doublet...

66. Silicon Sensor Testing

On-site project

We offer a project related to silicon sensor testing. The student will get involved in the CMS Outer Tracker Module assembly and testing and/or the evaluation of silicon test structures.

11. Sustainable spraying of functional nanoparticles and polymers diluted in green solvents for flexible electronics

On-site project

Cellulose is a sustainable material with many beneficial properties which makes it a suitable candidate as carrier material in multilayered systems. Part of our work is to functionalize thin films of cellulose nanofibrils (CNF) with various materials dispersed in different solvents via spray deposition. The majority of polymers are dissolved in toxic solvents like chloroform. We aim to...

7. Symetry-adapted graph neural networks for molecular vibrational wave functions

On-site project

Neural networks have been widely used to solve partial differential equations, which also includes solutions of the Schrödinger equation for quantum mechanical problems. The accurate symmetry properties of solutions of the Schrödinger equation are crucial for getting the correct results. However, up to date only permutational symmetry of particles have been considered for electronic wave...

44. TANGERINE – Test beam characterization of Monolithic Active Pixel Sensors

On-site planned, but remote also possible

Tracking detectors are key parts of the instrumentation in high energy physics experiments, and their majority is making use of silicon pixel sensors to detect charged particles. A new generation of Monolithic Active Pixel Sensors (MAPS), produced in a 65 nm CMOS imaging process, promises higher densities of on-chip circuits and hence smaller pixel sizes or more sophisticated circuitry. MAPS...

68. Tau lepton kinematics reconstruction using Deep Learning.

On-site planned, but remote also possible

Searches for the new phenomena that consider signature with $\tau$ leptons is of big interest at the CERN LHC. The reconstruction of tau decaying to hadrons ($\tau_h$) is based on the hadron-plus-strip (HPS) algorithm, which combines the charged hadrons and $\pi^0$ candidates, obtained by clustering photon and electron candidates. However, in contrast to this combinatorial approach this...

34. Test Beam Characterisation of a thin pixel sensors

On-site project

The TelePix HV-MAPS sensor is a fast, thin timing layer for the telescopes. The pixel pitch of 25 um in one dimension also has the potential to precisely determine the position of passing particles, depending on the rotation angle. The student will get familiar with the sensor in the beginning of the project and then carry out measurements at different rotations to check for an optimal angle...

41. Testing new hardware prototypes for the CMS HGCAL calorimeter upgrade

On-site project

The CMS experiment will need to upgrade its calorimeter endcaps for the HL-LHC phase. The backward part of the High Granularity CALorimeter (HGCAL) upgrade will consist of small scintillator tiles read out by silicon photomultipliers (SiPMs). DESY develops the readout units and the production and testing procedures for this part. The HGCAL will operate at -30 degrees C, in a high radiation...

27. Timepix4

On-site project

Timepix4 is a versatile readout chip with 55 µm pixels, recently developed by CERN on behalf of the Medipix4 collaboration. It can operate both in a photon counting mode with frame readout, and a timestamping mode with event readout. Both of these modes offer higher performance than existing Medipix3 and Timepix3 chips. This makes Timepix4 appealing to a wide range of X-ray experiments at...

31. Topping the artificial intelligence

On-site planned, but remote also possible

Elementary particles like top quarks create a signature that can be three different particles (and the jets that come from these particles). Distinguishing resolved top quarks from other particles/three-jet combinations is a difficult problem that particle physicists have been tackling for a very long time. But now there are many new ways of machine learning available, and it is worthwhile...

64. Towards modeling of tWGamma at NLO

On-site planned, but remote also possible

The electroweak couplings of the heaviest known particle, the top quark, has recently gained much attention because of their important role in connection with physics beyond the standard model. Top quark interactions with photon and the Z boson can be directly accessed in the associated ttbar+Ɣ/Z production. The measurement of these processes have entered the precision era during Run-II LHC...

57. Translation and combined analysis of jet production at ZEUS and CMS

On-site project

The study of jet production in ep and pp collisions is one of the most important tools to investigate Quantum Chromodynamics (QCD) across different domains.
In a previous summer student project, work has started to translate the ZEUS common ntuples into a format similar to CMS nanoAOD. Doing such a translation allows a common analysis and direct comparison of the resulting distributions with...

46. Ultrafast Mode-locked Fiber Laser and Amplifier

On-site project

The Project is aimed at the construction and characterization of a fiber laser mode-locked with the optical Kerr-effect for the generation of femtosecond pulse trains. The construction of the laser cavity includes the alignment of free-space components such as grating-pairs and collimators as well as the fabrication of a fiber-optic segment with fusion-splicing technology. All the required...

67. Ultrafast relaxation and fragmentation dynamics of astrochemically-relevant molecules investigated by pump-probe experiments at Free-Electron Lasers

On-site planned, but remote also possible

Polycyclic aromatic hydrocarbons (PAHs) are a set of molecules consisting of multiple fused aromatic rings. They are especially interesting in the context of the complex chemistry occurring in the interstellar medium (ISM). The first few (substituted) PAHs, indene, 1-cyanonaphthalene, and 2-cyanonaphthalene have been detected in the ISM [1,2,3], and many more are thought to exist because of...

19. Ultrashort laser pulse guiding in hollow core optical fibers

On-site project

Optical fibers provide the possibility to guide light in a wide parameter range over large distances, playing a very important role for everyday life applications and science. In particular, hollow-core fibers (HCFs) have attracted scientists' interest, supporting low optical loss, dispersion, and nonlinearity. Their ability to propagate light in vacuum or gases makes them highly suitable for...

35. V0-Finding at a Future Higgs Factory

On-site planned, but remote also possible

The next big particle collider project is foreseen to be an e+e- Higgs factory. Various detector concepts with advanced detector technologies have been proposed for such colliders, aiming to probe the Standard Model to unprecedented precision. In order to optimise the physics performance of these detectors, sophisticated reconstruction algorithms are being developed and benchmarked on detailed...