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Transverse coherence and pointing stability of the radiation from x-ray free electron lasers
- Source :
- Proceedings of SPIE 10237, 102370I (2017). doi:10.1117/12.2265567, Proc. SPIE, 2017.-ISBN-doi:10.1117/12.2265567, Proc. SPIE, 2017.-ISBN-doi:10.1117/12.2265567Advances in X-ray Free-Electron Lasers Instrumentation IV, Prague, Czech Republic, 2017-04-24-2017-04-27
- Publication Year :
- 2017
- Publisher :
- SPIE, 2017.
-
Abstract
- Proc. SPIE, 2017. - ISBN - doi:10.1117/12.2265567 Advances in X-ray Free-Electron Lasers Instrumentation IV, Prague, Czech Republic, 24 Apr 2017 - 27 Apr 2017; Proceedings of SPIE 10237, 102370I (2017). doi:10.1117/12.2265567<br />The radiation from SASE FEL has always limited value of the degree of transverse coherence. When transverse size of the electron beam significantly exceeds diffraction limit, the mode competition effect does not provide the selection of the ground mode, and spatial coherence degrades due to contribution of the higher order transverse modes. It is important that the most strong higher modes are azimythally non-symmetric which leads to fluctuations of the spot size and of the pointing stability of the photon beam. These fluctuations are fundamental and originate from the shot noise in the electron beam. The effect of the pointing instability becomes more pronouncing for shorter wavelengths. We analyze in detail the case of optimized SASE FEL and derive universal dependencies applicable to all operating and planned x-ray FELs. It is shown that x-ray FELs driven by low energy electron beams will exhibit poor spatial coherence and bad pointing stability.<br />Published by SPIE, Bellingham, Wash.
- Subjects :
- Physics
Diffraction
Photon
business.industry
Shot noise
Free-electron laser
02 engineering and technology
021001 nanoscience & nanotechnology
Laser
01 natural sciences
law.invention
Coherence length
010309 optics
X-ray laser
Optics
law
0103 physical sciences
Physics::Accelerator Physics
ddc:620
0210 nano-technology
business
Coherence (physics)
Subjects
Details
- ISSN :
- 0277786X
- Database :
- OpenAIRE
- Journal :
- Advances in X-ray Free-Electron Lasers Instrumentation IV
- Accession number :
- edsair.doi.dedup.....d55de25fcd04db8bedc1b1df79e66a52