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

Stable resonance islands and their application in light sources
The use of stable islands in conjunction with proton beams has been probed in detail in recent years at the CERN Proton Synchrotron for multi-turn extraction (MTE) and has been put in operation. The experience gathered at CERN is ready and mature to be transferred to other domains of accelerator physics. The 4th generation synchrotron light sources are being constructed worldwide as a new game-changing type of x-ray facilities, and DESY is planning the world’s brightest next generation hard x-ray storage ring with PETRA IV. Synchrotron light sources offer a unique opportunity to further develop the use of stable islands. Three possible lines of research include:
• Use of stable islands for generation of variable bunch length beams
• Use of stable islands for generation of synchrotron light with multiple beams
• Use of stable islands as a means for effective synchrotron top-up operation and test beam operation of the booster

A detailed description of the project can be found here

The candidate should mandatorily apply to the Gentner Programme
https://wolfgang-gentner-stipendien.web.cern.ch/wolfgang-gentner-stipendien/de/index.php

The successful PhD candidate will be based at CERN with visits to DESY manly to carry out the experi-mental programme of the PhD project.

Availability: Immediate start is possible.

What you learn:
Nonlinear beam dynamics, electron storage ring physics, programming, optimization methods.

Contact: Wolfgang Hillert (wolfgang.hillert@desy.de), Massimo Giovannozzi (Massimo.Giovannozzi@cern.ch), Ilya Agapov (ilya.agapov@desy.de)
Supervisor: Massimo Giovannozzi

Optics measurement, correction and beam-based optimization for next-generation electron storage rings

Short description
PETRA IV is a next-generation synchrotron radiation facility currently under designs at DESY. The main 6 GeV 2304 m long storage ring will be based on the multi-bend achromat (MBA) technology, which will allow to reduce the electron beam emittance by several orders of magnitude compared to third-generation sources. The cost of this reduction is, among other things, the dramatically increased sensitivity of electron beam optics. Fast reliable methods of linear and nonlinear optics measurement and correction will be crucial for successful machine commissioning and operation.
The goal of this work will be to develop the next generation methods for storage ring electron optics measurement and correction exploiting a variety of beam measurements such as pinged beams, AC excitations, and response matrices, in combination with beam-based (semi-empirical) optics optimization approaches. The existing PETRA III facility will be used to test and benchmark the approaches experimentally.
Collaboration with other laboratories pursuing electron storage ring design and operation such as HZB (Berlin), CERN, APS (Argonne), ESRF (Grenoble) and SLAC (Stanford, USA) will be possible.

Availability: Immediate start is possible.

What you learn:
Nonlinear beam dynamics, electron storage ring physics, programming (python, C++, GPU), optimization methods, data analysis and machine learning techniques and tools.

Contact: Wolfgang Hillert (wolfgang.hillert@desy.de), Ilya Agapov (ilya.agapov@desy.de)
Supervisor: Ilya Agapov (ilya.agapov@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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