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CT05 |
Beam Loss Detection at Radiation Source ELBE
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65 |
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- P. Michel, J. Teichert, R. Schurig, H. Langenhagen
FZR, Forschungszentrum Rossendorf, Dresden, Germany
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The Rossendorf superconducting Electron Linac of high Brilliance and low
Emittance (ELBE) delivers an 40 MeV, 1 mA cw-beam for different
applications such as bremsstrahlung production, electron channelling,
free-electron lasers or secondary particle beam generation. In this
energy region in case of collisions of the electron beam with the pipe
nearly all beam power will be deposited into the pipe material. Therefore
a reliable beam loss monitoring is essential for machine protection
at ELBE. Different systems basing on photo multipliers, compton diodes
and long ionization chambers were studied. The pros and cons of the
different systems will be discussed. Ionization chambers based on
air-isolated RF cables installed some cm away parallel to the beam line
turned out to be the optimal solution. The beam shut-off threshold was
adjusted to 1 μC integral charge loss during a 100 ms time interval. Due
to the favourable geometry the monitor sensitivity varies less than ±50%
along the beam line (different shielding conditions).
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