Offene Stellen für Doktoranden

Status:
Bewerbungen auf Doktorandenstellen werden gerne jederzeit entgegengenommen. Eine Anstellung erfolgt entweder an der Universität Hamburg oder am DESY Hamburg.

Anforderungen:

Vorherige Tätigkeiten im Bereich der Beschleunigerphysik sind wünschenswert jedoch nicht erforderlich. Voraussetzung für eine Anstellung ist ein Diplom/Master in Physik oder einer äquivalenten Wissenschaft.
Erwartet werden neben Teamfähigkeit und Einsatz gute Englischkenntnisse.
      

Beschleunigerphysikalische Arbeiten am Institut für Experimentalphysik der UHH und DESY/Hamburg

RF and material characterization of nitrogen treated niobium in a new developed Quadrupole Resonator

Short Description
The goal within the superconducting accelerator R&D program at DESY and the University of Hamburg is to gain a fundamental understanding of the properties of niobium, used to fabricate accelerating cavities, and their influence on the performance of the produced cavities. In order to achieve this, a complete new device called Quadrupole Resonator is being designed. It will allow investigating key parameters of samples regarding the RF performance while doing material analysis on the samples (like SEM/EDX, XRR, SIMS, EBSD, PALS) as well. This combination is a unique program and will be carried out in a national and international collaboration with HZB, CERN, TU-HH, TU Darmstadt, CEA Saclay and IFAM Bremen. You would contribute significantly in the development and commissioning of the Quadrupole Resonator and the necessary infrastructure and perform first tests on the samples fabricated and treated with your help.

Availability: Immediate start is possible.

What you learn
Superconducting radio-frequency concepts, BCS theory, cryogenics, Labview, chemical treatment & heat treatment of samples, vacuum systems, surface analysis techniques like SIMS, EBSD, SEM, XRR, LLRF control of resonators

Contact: Wolfgang Hillert (wolfgang.hillert@desy.de)
Supervisor: Marc Wenskat (marc.wenskat@desy.de)

Beschleunigerphysikalische Arbeiten am DESY in Zeuthen bei Berlin

Research on Photo cathodes and Photo emission in high gradient RF guns

Short description
Characterization of different kinds of photocathodes (either sensitive to UV or visible (green) laser light) inside high gradient RF guns, measure thermal emittance under different operation conditions and study space charge dominated photo emission. Besides participating in the preparation of photocathodes sensitive for green laser light in Milano, Italy, this work requires to perform numerical simulations and comparing those with data from experiments done with the PITZ accelerator in Zeuthen (southeast of Berlin).

Availability: immediate start possible

What you learn
Photo injector, photo cathode and photo emission physics, beam dynamics with high space charge density, experimental skills, characterization and operation of high brightness electron sources, data analysis, working in an international research team

Contact: Frank Stephan (frank.stephan@desy.de)
Supervisor: Houjun Qian (houjun.qian@desy.de)

Research on Seeding options for a high power, tunable, accelerator based THz source for pump-probe experiments at European XFEL

Short description
A design for an accelerator based, high power, tunable SASE THz source for pump-probe experiments at European XFEL is under consideration at PITZ. In order to allow a high level of reproducibility of the THz radiation different THz seeding schemes need to be studied and evaluated. This work requires to perform numerical simulations and comparing those with data from experiments done with the PITZ accelerator in Zeuthen (southeast of Berlin).

Availability: start in autumn 2018 possible

What you learn
Photo injector, SASE FEL and seeding physics, beam dynamics with high space charge density, experimental skills, characterization and operation of high brightness electron sources, data analysis, working in an international research team

Contact: Frank Stephan (frank.stephan@desy.de)
Supervisor: Mikhail Krasilnikov (mikhail.krasilnikov@desy.de)

Characterization of 6D phase space of high brightness electron beams

Short description
Full 6D characterization of the photo injector beam phase space requires studies of transverse X-Y coupling as well as time resolved measurements enabled by the PITZ transverse deflecting cavity. Available techniques to measure horizontal and vertical phase spaces have to be generalized in order to reconstruct a 4D transverse phase space. The deflecting cavity should enable to characterize time dependent correlations as well as longitudinal phase space measurements. This work requires performing numerical and beam dynamics simulations and comparing those with data from experiments done with the PITZ accelerator in Zeuthen (southeast of Berlin).

Availability: start in autumn 2018 possible

What you learn
Photo injector physics, beam dynamics of space charge dominated electron beams in RF photo injectors, experimental skills, characterization and operation of high brightness electron sources, data analysis, working in an international research team

Contact: Frank Stephan (frank.stephan@desy.de)
Supervisor: Mikhail Krasilnikov (mikhail.krasilnikov@desy.de)

Experiments with modulated plasma density profiles

Short description
A unique plasma cell is operated at the PITZ accelerator (southeast of Berlin). This is a lithium plasma oven where the ionization laser (UV excimer laser) is coupled from the side (orthogonal to the electron beam direction). Beam driven plasma acceleration experiments have been performed successfully with a homogeneous plasma profile in the past. The scope of this work is to implement the possibility to modulate the plasma density profile along the plasma channel by manipulating the ionization laser intensity with masks, filters etc. The main task is to prepare and carry out experiments; PIC simulations will be conducted to interpret the results.

Availability: start in autumn 2018 possible

What you learn
Plasma wakefield acceleration (experiments and simulation), photo injector, experimental skills, operation of high brightness electron sources, data analysis, working in an international research team

Contact: Frank Stephan (frank.stephan@desy.de)
Supervisor: Matthias Gross (matthias.gross@desy.de)

 

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