Commissioning experience with insertion devices at PETRA III |
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Authors: | P V Vagin U Englisch T Müller A Schöps M Tischer |
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Institution: | 1.Deutsches Elektronen-Synchrotron (DESY),Hamburg,Germany |
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Abstract: | PETRA III is a new hard X-ray synchrotron radiation source, operating at 6 GeV with a beam current of up to 100 mA and extremely
low horizontal emittance of 1 nm rad. Such low emittance is achieved by using two 100 m long damping wiggler sections which
reduce the emittance by a factor of 4. Altogether the damping sections contain 20 wigglers of 4m length each. The emitted
synchrotron radiation power produced by wigglers amounts to 420 kW at 100 mA beam current in total. In the new octant of PETRA
III, there are 14 undulator beamlines, with a brilliance up to 1021 (s mrad2 mm2 0.1% BW)−1 which cover an energy range from 0.3 keV to more than 100 keV. The low emittance raises very high requirements to the field
quality of the insertion devices. At first, it should not affect the positron beam trajectory. Secondly, the spectral properties
of the radiation created, like the intensity of higher harmonics, should not be limited by the undulator field quality, but
by the beam emittance effects in order to have some reserve for future machine upgrades or possible radiation demagnetization.
This paper presents the current status of PETRA III insertion devices and describes intermediate commissioning results like
impact of IDs on the positron beam orbit or photon beam and radiation problems. |
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