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Diagnostic Tools for the Undulator System of the Seeded HGHG-FEL at MAX-lab

Publiceringsår: 2008
Språk: Engelska
Sidor: 243-246
Publikation/Tidskrift/Serie: Proceedings of FEL08
Dokumenttyp: Konferensbidrag


Within a collaboration between MAX-lab and BESSY

a one stage seeded HGHG-FEL has been set up at Maxlab.

BESSY has built the undulator system consisting of a

modulator, a radiator and an electromagnetic chicane.

BESSY has also installed three types of diagnostic tools:

optical fibres for a fast Cherenkov beam loss detection,

optical fibres for absolute dose measurements via their

radiation-induced attenuation and THz detectors for the

characterization of electron bunch properties. During first

injections with a laser driven rf-gun the Cherenkov fibres

have delivered detailed spatial information on the beam

losses inside the beamline. Over the last year the second

system, based on powermeter measurements, has detected

a total dose of 180Gy. The high sensitivity and low drift

of this system has been demonstrated. A THz detector

behind the last dipole magnet close to the beam dump

provides information on the bunch compression and the

laser induced energy modulation. We report on the

measurements performed with these diagnostics tools.


  • Natural Sciences
  • Physical Sciences


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