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Project D - Development of Detectors for the High-Luminosity LHC Upgrades

Silicon strip detectors, micro-patterned gas detectors for the muon-spectrometer, development of fast and radiation-hard readout electronics

H. Fischer, S. Kühn, U. Landgraf, U. Parzefall, S. Zimmermann 

 

Subjects for PhD theses

 

D.1 Development of novel Silicon Strip Detectors for the ATLAS-Upgrade

 

  •  Studies of Radiation Hard Silicon Detectors irradiated to HL-LHC doses and beyond (Kühn, Parzefall)

    In the framework of a PhD project, a range of prototype silicon strip detectors should get irradiated to several fluences up to and exceeding the dose expected for the HL-LHC after 3000 fb-1. These sensors are then subjected to a comparative study of radiation hardness. Detectors in this study will include prototype sensors from the ongoing prototyping efforts for the ATLAS ITk upgrade as well as sensors from RD50 projects, such as CMOS, Nitrostrip, Low Gain Avalanche Detectors (LGADs) and charge multiplication sensors. The aim of the study is twofold: First, to achieve a large and quantitative overview of the radiation hardness of standard as well as more exotic detector options. Second, to validate the performance in all stages of irradiation of the sensors to be used in the upgraded ATLAS silicon tracker. For this purpose, some of the ATLAS sensors should be assembled into modules with final front end electronics and then irradiated. One additional long-term goal of this project is to identify sensor options for Colliders beyond the LHC, e.g. the Future Circular Collider (FCC).

 

  • Development of Assembly Procedures and QA/QC of Modules and Test Beam Measurements for the Endcaps of the ATLAS Strip Upgrade (Kühn, Parzefall)

    A further PhD project aims at systematically developing the procedures for assembling modules in the pre-series and series production of modules for the Endcaps of the ATLAS-Upgrade. In connection with these procedures, strict criteria for the Quality Assurance (QA) and Quality Control (QC) have to be drawn up, established and validated as the module assembly progresses from a few prototypes to pre-series production and ultimately the series production. Another challenge is to monitor the quality of the incoming components to module production, such as sensors, front-end electronics, glues and power boards. It will also be required to regularly irradiate components and modules and study their radiation tolerance throughout the process, which links this PhD topic to the one on radiation hardness studies. Several modules should also be examined for their performance in a test beam at DESY or CERN, which constitutes an essential component of this PhD project. The project involves close cooperation with the other German and international groups working in module production and test beam studies.

 

D.2 Development of new muon detectors

 

  • Development of algorithms for the HV monitoring of Muon chambers in the ATLAS NSW detector, and early detection of instabilities (Herten, Zimmermann)

    For the Micromegas and sTGC chambers used in the ATLAS NSW detector monitoring the HV current and an early detection of the onset of instabilities (sparking) is crucial to ensure the lifetime of the detector over 10 years. We are looking for a PhD student to study the mechanism of how instabilities develop, and apply the gained knowledge to the ATLAS experiment in terms of implementing algorithms for HV monitoring.

     
  • Optimisation of the track and momentum reconstruction of the ATLAS NSW system using information of the Alignment system, and alignment using tracks (Herten, Zimmermann)

    After installation and initial commissioning of the new NSW detector, the geometry used in the reconstruction will be based on the nominal geometry, and information available from survey. It will be refined once data from straight tracks (runs with beam and ATLAS magnets off) is available. The thesis will focus on studying which modifications are needed to the existing framework, to optimally describe the deformation modes of the NSW micromegas and sTGC chambers. It will also address the question to what extend track alignment can be used to gain information on the position and deformantion of readout elements within a detector chamber, which was not done so far.

 

D.3 High Performance Readout and Trigger Electronics

 

  • Development of Topological Decision Trees for High Performance Readout and Trigger Electronics (Fischer)

    This PhD project deals with the development of fast and efficient topological decision trees for tracking and particle identification of charged particles. Micro structured gas detectors for ionizing particles in combination with solid state photocathodes are ideally suited for photon detection in large scale ring imaging Cerenkov counters. Such detectors, complemented with digital high performance readout will allow for the implantation of online ring search algorithm in FPGA technology.
     
  • High Performance Online Tracking for a Two Muon Trigger (Fischer)

    The development of fast and efficient algorithms for charged particle tracking, momentum measurement and vertex reconstruction in the environment of strong magnetic fields will be subject of a second R&D project. To cope with the complexity of the problem it aims for the implementation of the selected algorithms in graphics processing units mounted to FPGA controlled VME boards.

 

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