| Paper |
Title |
Page |
| WEPPH003 |
Magnetic Measurements of the FLASH Infrared Undulator
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318 |
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- A. Chesnov, E. A. Matushevsky, D. Petrov, E. Syresin, N. A. Morozov
JINR, Dubna, Moscow Region
- O. Grimm, Y. Holler
DESY, Hamburg
- J. Rossbach
Uni HH, Hamburg
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The FLASH free-electron laser at DESY, Hamburg, will be equipped with an infrared electromagnetic undulator during the current shut-down, providing radiation in the range 1-200 um. It will be used both for electron beam diagnostics purposes and as a powerful source synchronized to the VUV and soft X-ray pulses of the FEL. The undulator was constructed at the Joint Institute of Nuclear Research (JINR). This paper summarizes the extensive magnetic measurements that where performed both at JINR and DESY prior to installation of the undulator.
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| WEPPH004 |
Numerical Calculations of the Radiation Emitted from the FLASH Infrared Undulator
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322 |
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- V. Kocharyan, J. Rossbach, O. Grimm
DESY, Hamburg
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The results from the magnetic measurements with the FLASH infrared electromagnetic undulator reported in a companion paper where used as input for calculations of the expected radiation spectrum. Especially the behaviour of the device at small first harmonic wavelengths, i.e. small excitation currents, is important for beam diagnostics, as here the high intensity in a narrow band is a distinct advantage over broad-band sources to detect small bunch structures. The field quality is reduced at small currents due to imperfections in the yoke construction and limited compensation by correction windings. A determination of the lower limit for useful operation of the device follows from these calculations.
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