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dr. ir. W.Knulst 

Walter  Knulst
Postdoctoral Researcher
Email: http://nl.linkedin.com/in/wknulst
Address:
Delft University of Technology
DelftChemTech
Julianalaan 136
2628 BL Delft
The Netherlands
Tel. +31 (0)15 2783137
Fax. +31 (0)15 2787421
Room number: 0.241

Research Interests

1. Ultrashort pulsed electron accelerator for radiolysis
   By the use of a RF standing-wave cavity, a so-called RF gun, 1-nC electron bunches of 1 picosecond duration will be generated at a maximum pulse repetition frequency of 100 Hz. This set-up is currently under construction. The ultrashort pulsed electron accelerator will be used to study charge carrier dynamics in opto-electronic materials. The electron bunches irradiate a sample of any opto-electronic material to generate excitations, which will be analyzed as function of time using several different detection methods, such as transient THz conductivity and optical absorption.
2. High power femtosecond laser system for photolysis
   A femtosecond laser system is installed to study charge carrier dynamics in opto-electronic materials and for the purpose of the ultrashort pulsed electron accelerator. Femtosecond laser pulses are illuminating a sample of any opto-electronic material to generate excitations, which will be analyzed as function of time using several different detection methods, such as transient THz conductivity and optical absorption.
3. Soft x-ray radiation generated by relativistic electrons (topic of my PhD project)
   Scientific research on soft x-ray, narrowband Cherenkov radiation generated by relativistic electrons. The special characteristics, which have been theoretically and experimentally investigated, indicate that this Cherenkov effect can be applied as a novel high-brightness, compact soft x-ray source.

Biography

2004-          PostDoc, Opto-electronic materials, DelftChemTech, Delft University of Technology, The Netherlands

1999-2003   PhD Student, Physics and Application of Accelerators, Department of Applied Physics, Eindhoven University of Technology, The Netherlands
1994-1999   Undergraduate studies, Applied Physics, University of Twente, The Netherlands.

Selected Publications

• “Compact High-Brightness Soft X-Ray Cherenkov Sources”
  W. Knulst, O.J. Luiten, J. Verhoeven, IEEE special topics Quantum Electronics 10, 1414-1425 (2004).
  
  
• “Cherenkov radiation in the soft x-ray region: towards a compact narrowband source.”
  W. Knulst, Thesis, Eindhoven, January 2004.
  
  
• “High-brightness, narrowband and compact, soft x-ray Cherenkov sources in the water window”
  W. Knulst, M.J. van der Wiel, O.J. Luiten, and J. Verhoeven, Applied Physics Letters 83, 4050-4052 (2003).
  
  
• “Observation of narrow band Si L edge Cherenkov radiation generated by 5-MeV electrons”
  W. Knulst, O.J. Luiten, M.J. van der Wiel and J. Verhoeven, Applied Physics Letters 79, 2999-3001 (2001).

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