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@INPROCEEDINGS{Vagin:205487,
      author       = {Vagin, Pavel and Bilani, Orkidia and Schoeps, Andreas and
                      Tripathi, Sumit and Vielitz, Thorsten and Tischer, Markus},
      title        = {{R}adiation {D}amage of {U}ndulators at {PETRA} {III}},
      address      = {Geneva},
      publisher    = {JACoW, Geneva, Switzerland},
      reportid     = {PUBDB-2015-00051},
      isbn         = {978-3-95450-132-8},
      pages        = {2019-2021},
      year         = {2014},
      comment      = {Proceedings of the 5th Int. Particle Accelerator Conf.,
                      IPAC2014, Dresden, Germany},
      booktitle     = {Proceedings of the 5th Int. Particle
                       Accelerator Conf., IPAC2014, Dresden,
                       Germany},
      abstract     = {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
                      "sacrificial" undulator, installed in FLASH. Its magnetic
                      field is periodically remeasured and shows field amplitude
                      decrease of $1\%$ per 16kGy accumulated dose.},
      month         = {Jun},
      date          = {2014-06-15},
      organization  = {International Particle Accelerator
                       Conference IPAC, Dresden (Germany), 15
                       Jun 2014 - 20 Jun 2014},
      keywords     = {Accelerator Physics (Other) / 02 Synchrotron Light Sources
                      and FELs (Other) / T15 Undulators and Wigglers (Other)},
      cin          = {FS-US},
      cid          = {I:(DE-H253)FS-US-20120731},
      pnm          = {6G3 - PETRA III (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6G3},
      experiment   = {EXP:(DE-H253)PETRAIII(machine)-20150101},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
      doi          = {10.18429/JACoW-IPAC2014-WEPRO035},
      url          = {https://bib-pubdb1.desy.de/record/205487},
}