M.Sc. Johann Heller

 

 

 

 

Fakultät für Informatik und Elektrotechnik
Albert-Einstein-Straße 2 
18059 Rostock
Haus 5, Ex 136
Tel.: 0381-498-7076
Fax: 0381-498-7081
Email: johann.heller(at)uni-rostock.de

 

 

R E S E A R C H    I N T E R E S T S
  • Numerical simulation of electromagnetic fields
  • Modelling of long complex structures
  • Beam position monitoring using beam excited higher order modes
  • Investigation of uncertainties in the measurement system using deterministic and stochastic approaches

 

D E S C R I P T I O N


The measurement of beam parameters is of crucial importance for the operation of modern particle accelerators. While plenty of measurement systems exist on this purpose, new approaches propose to use the beam excited Higher Order Modes (HOM) to quantify the beam. Such a HOM Beam-Position-Monitoring System (BPM) is installed in the FLASH accelerator at DESY in Hamburg. In order to improve the accuracy and to make an assessment of attainable accuracy and the performance capability for other accelerators, this system needs further investigation. 


A P P R O A C H
  •  Model the accelerating structure and the electronic system for BPM for the 1.3 GHz Cavity and 3.9 GHz Third harmonic Cavity at FLASH
  •  Analyse the systems gradient for different parameters 
  • Deterministic and stochastic modelling of uncertainties


J O U R N A L    P U B L I C A T I O N S

C O N F E R E N C E    P U B L I C A T I O N S

C O L O R F U L    P I C T U R E S

Figure: Magnitude of the electric field of a TM monopole multi-cavity mode in a chain of eight third-harmonic cavities. The depicted eigenmode has a resonant frequency of 7.1905 GHz and is computed in an efficient way on a standard workstation computer by means of the state-space concatenation approach.

 

 

Figure: Magnitude of the electric field of TM01-π-modes in a chain of four third-harmonic cavities with couplers.