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Optical fibre dosimeter for SASE FEL undulators

: Henschel, H.; Kuhnhenn, J.; Körfer, M.; Wulf, F.

Fulltext urn:nbn:de:0011-n-263624 (216 KByte PDF)
MD5 Fingerprint: e788e8569613e0847fb71a71ce655575
Created on: 26.01.2005

Peters, A. ; Gesellschaft für Schwerionenforschung mbH -GSI-, Darmstadt:
DIPAC 2003. Proceedings
Darmstadt, 2003
European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators (DIPAC) <6, 2003, Mainz>
Conference Paper, Electronic Publication
Fraunhofer INT ()
optical fibre dosimetry; FEL; radiation sensor; optical fibre radiation effect

Single pass Free Electron Lasers (FELs) based on selfamplified spontaneous-emission (SASE) are developed for high-brightness and short wavelength user applications. These light sources are related to short undulator periods which can be realized with permanent magnet designs. Unfortunately, the material is radiation sensitive and the undulators require a protection system. To monitor particle losses directly inside the undulator gap and to guarantee full magnetic performance for a long time, an optical fiber dosimeter has been developed and operated at the TESLA Test Facility (TTF). The dosimeter system allows online dose monitoring and beam particle loss optimisation.