%0 Conference Paper
%A Vagin, Pavel
%A Bilani, Orkidia
%A Schoeps, Andreas
%A Tripathi, Sumit
%A Vielitz, Thorsten
%A Tischer, Markus
%T Radiation Damage of Undulators at PETRA III
%C Geneva
%I JACoW, Geneva, Switzerland
%M PUBDB-2015-00051
%@ 978-3-95450-132-8
%P 2019-2021
%D 2014
%< Proceedings of the 5th Int. Particle Accelerator Conf., IPAC2014, Dresden, Germany
%X In the new octant of PETRA III, there are 14 undulator beamlines covering photon energy range from 0.3keV to 150keV. There are also 80m of damping wigglers in order to achieve a low emittance of 1nmrad. Some of these devices, operating at PETRAIII since 2008, accumulated totalradiation doses of about 100kGy.Visible corrosion at the magnet structures of some permanent magnet undulators setting in after a few years and a high dose rate measured regularly by thermoluminescent dosimeters (TLDs) gave reason to inspect the magnetic field of all insertion devices in the PETRA tunnel. This paper presents details of the magnetic field degradation caused byradiation damage to the undulator magnets. For some undulators changes in the spectral properties of the generated light were observed. It was measured with different taper settingsin order to partly compensate the nonuniform demagnetization along the structure. The results are compared with the data from the sFLASH undulators and measurements of special 3 pole ßacrificial" undulator, installed in FLASH. Its magnetic field is periodically remeasured and shows field amplitude decrease of 1
%B International Particle Accelerator Conference IPAC
%C 15 Jun 2014 - 20 Jun 2014, Dresden (Germany)
Y2 15 Jun 2014 - 20 Jun 2014
M2 Dresden, Germany
%K Accelerator Physics (Other)
%K 02 Synchrotron Light Sources and FELs (Other)
%K T15 Undulators and Wigglers (Other)
%F PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
%9 Contribution to a conference proceedingsContribution to a book
%R 10.18429/JACoW-IPAC2014-WEPRO035
%U https://bib-pubdb1.desy.de/record/205487